One A Distillation Under Positive Pressure Or Vacuum Patents (Class 203/73)
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Patent number: 10563140Abstract: An installation and a process which jointly implement compression of acid gases from a hydroconversion or hydrotreatment unit and gaseous effluents from a catalytic cracking unit.Type: GrantFiled: December 22, 2016Date of Patent: February 18, 2020Assignee: AXENSInventors: Odile Lajeunesse, Nicolas Lambert, Jacinthe Frecon, Jerome Pigourier
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Patent number: 8992737Abstract: A trihalosilane refining device and a trihalosilane refining method are provided. The trihalosilane refining device can be useful in obtaining high-purity trihalosilane from a feed containing a trihalosilane while consuming a small amount of energy.Type: GrantFiled: November 25, 2013Date of Patent: March 31, 2015Assignee: LG Chem, Ltd.Inventors: Sung Kyu Lee, Joon Ho Shin, Jong Ku Lee, Sung Kyun Kim
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Patent number: 8986508Abstract: A thermal desalination system adapted to produce distilled water from feed water which may be sea water, based on a forward feed evaporator made up of a main water feed line, a vapor feed line, a distilled water main line and any number of effect groups. The effect groups include any number of effects which in turn include vapor inlets, water inflow lines, concentrate outflow lines that drain into a common concentrate drainage line, a vapor and water outlet in fluid communication with the distilled water main line, and heat transfer means that condense part of an inlet vapor to produce the distilled water.Type: GrantFiled: October 21, 2013Date of Patent: March 24, 2015Assignee: I.D.E. Technologies Ltd.Inventors: Avraham Ophir, Joseph Weinberg
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Patent number: 8974642Abstract: A trihalosilane refining device and a trihalosilane refining method are provided. The trihalosilane refining device can be useful in obtaining high-purity trihalosilane from a feed containing a trihalosilane while consuming a small amount of energy.Type: GrantFiled: November 25, 2013Date of Patent: March 10, 2015Assignee: LG Chem, Ltd.Inventors: Sung Kyu Lee, Joon Ho Shin, Jong Ku Lee, Sung Kyun Kim
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Patent number: 8968521Abstract: A trihalosilane refining device and a trihalosilane refining method are provided. The trihalosilane refining device can be useful in obtaining high-purity trihalosilane from a feed containing a trihalosilane while consuming a small amount of energy.Type: GrantFiled: November 25, 2013Date of Patent: March 3, 2015Assignee: LG Chem, Ltd.Inventors: Sung Kyu Lee, Joon Ho Shin, Jong Ku Lee, Sung Kyun Kim
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Patent number: 8936718Abstract: A method for recovering base oil from waste lubricating oil by separating base oil range constituents from a waste lubricating oil mixture, thereafter separating higher quality base oil constituents and lower quality base oil constituents from the base oil recovered from the waste lubricating oil mixture and thereafter treating the lower quality base oil constituents to produce marketable base oil. The total base oil produced from a waste lubricating oil mixture by this process is greater than the quantity producible by previous processes using only base oil separation from the waste lubricating oil mixture or processes which use only treatment of the base oil recovered from the waste lubricating oil mixture to produce the product base oil.Type: GrantFiled: May 16, 2011Date of Patent: January 20, 2015Assignee: Verolube, Inc.Inventor: Martin R. MacDonald
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Patent number: 8916740Abstract: An aromatics complex producing one or more xylene isomers offers a large number of opportunities to conserve energy by heat exchange within the complex. One previously unrecognized opportunity is through providing two parallel distillation columns operating at different pressures to separate C8 aromatics from C9+ aromatics. The parallel columns offer additional opportunities to conserve energy within the complex.Type: GrantFiled: August 25, 2010Date of Patent: December 23, 2014Assignee: UOP LLCInventors: Gregory R. Werba, Jason T. Corradi, David W. Ablin
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Patent number: 8840762Abstract: An aromatics complex producing one or more xylene isomers offers a large number of opportunities to conserve energy by heat exchange within the complex. One previously unrecognized opportunity is through providing two parallel distillation columns operating at different pressures to separate C8 aromatics from C9+ aromatics. The parallel columns offer additional opportunities to conserve energy within the complex.Type: GrantFiled: August 25, 2010Date of Patent: September 23, 2014Assignee: UOP LLCInventors: Gregory R. Werba, Jason T. Corradi, David W. Ablin
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Patent number: 8741109Abstract: A method for purifying a crude acetone raw material containing low molecular weight impurities using two columns is disclosed. Crude acetone raw material is fed into a first column; adding an alkaline reagent and an oxidative agent into the first column to form high molecular weight impurities; removing a top fraction from the first column by distillation to form bottom fraction containing an acetone mixture containing high molecular weight impurities; feeding the bottom fraction containing the acetone mixture obtained to a second rectification column at a charge point on the column; adding an alkaline reagent to the second column above the charge point of the bottom fraction fed; and separating a purified acetone from the high molecular weight impurities and removing the purified acetone as a top fraction by distillation in the second column, wherein the second rectification column is operated at atmospheric pressure.Type: GrantFiled: December 8, 2009Date of Patent: June 3, 2014Assignee: Sabic Innovative Plastics IP B.V.Inventors: Mark Erik Nelson, Andrey Yurievich Sokolov, Ilya Yurievich Krupenko, Valery Yurievich Aristovich
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Patent number: 8709238Abstract: Crude tall oil is subjected to a distillation process that substantially removes impurities. The process produces a combined pitch and a distillate of free fatty acids and rosin acids from two vacuum columns. The distillate stream is amenable to further downstream hydroprocessing.Type: GrantFiled: May 18, 2012Date of Patent: April 29, 2014Assignee: UOP LLCInventor: John A. Petri
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Patent number: 8574406Abstract: A fermentation liquid feed including water and a product alcohol and optionally CO2 is at least partially vaporized such that a vapor stream is produced. The vapor stream is contacted with an absorption liquid under suitable conditions wherein an amount of the product alcohol is absorbed. The portion of the vapor stream that is absorbed can include an amount of each of the water, the product alcohol and optionally the CO2. The temperature at the onset of the absorption of the vapor stream into the absorption liquid can be greater than the temperature at the onset of condensation of the vapor stream in the absence of the absorption liquid. The product alcohol can be separated from the absorption liquid whereby the absorption liquid is regenerated. The absorption liquid can include a water soluble organic molecule such as an amine.Type: GrantFiled: February 8, 2011Date of Patent: November 5, 2013Assignee: Butamax Advanced Biofuels LLCInventors: Michael Charles Grady, William D. Parten, Robert W. Sylvester, Joseph J. Zaher
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Patent number: 8551296Abstract: Ultra high purity hexachlorodisilane is prepared from hexachlorodisilane-containing mixtures from numerous sources by distillation wherein water is present at less than 10 ppbw.Type: GrantFiled: October 7, 2008Date of Patent: October 8, 2013Assignee: Wacker Chemie AGInventors: Wolfgang Knies, Karin Boegershausen, Hans Eiblmeier
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Patent number: 8530679Abstract: The present invention provides a process for handling ?9-THC, which comprises preparing a solution of ?9-THC in a solvent which exists as a gas at room temperature and atmospheric pressure. The invention also provides solutions of ?9-THC in the solvent and solid preparations of ?9-THC.Type: GrantFiled: February 19, 2008Date of Patent: September 10, 2013Assignee: Resolution Chemicals LimitedInventors: Parveen Bhatarah, Alan Kenneth Greenwood, Derek McHattie, Jerome Thomas Garfield Carr-Brion
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Patent number: 8518219Abstract: Organic waste disposal technologies are disclosed herein. A multistage processing of sewage sludge into synthetic fuel and chemical products is carried out by means of a direct thermo-chemical liquefaction process. The process enables the minimization of coke formation by utilizing steam stripping in the processing of sewage sludge.Type: GrantFiled: January 1, 2009Date of Patent: August 27, 2013Assignee: Metal Tech Ltd.Inventors: Yefim Plopski, Alexander Rogov
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Publication number: 20130118893Abstract: Provided herein are compounds of the formula: in which n is an integer equal to or greater than 1; R2 is selected from hydrogen and optionally substituted alkyl that is saturated or unsaturated, and branched or unbranched; and R1, R3, and R4, independently for each occurrence, are selected from optionally substituted alkyl that is saturated or unsaturated, and branched or unbranched, wherein compositions comprising the compounds are characterized by particular combinations of values for estolide number, kinematic viscosity, and pour point. Also provided are compositions containing the compounds and methods of making both the compounds and compositions thereof.Type: ApplicationFiled: December 11, 2012Publication date: May 16, 2013Inventor: Jakob BREDSGUARD
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Patent number: 8317982Abstract: The present invention discloses a process and apparatus for utilization of waste heat of flue gas liberated from different heat sources to provide high quality water from sea/brackish.Type: GrantFiled: March 15, 2007Date of Patent: November 27, 2012Inventor: Subrahmanyam Kumar
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Publication number: 20120202066Abstract: Disclosed are improved processes for preparing prasugrel compound of formula-(1), its intermediates and pharmaceutically acceptable salts.Type: ApplicationFiled: October 7, 2010Publication date: August 9, 2012Inventors: Manne Satyanarayana Reddy, Srinivasan Thirumalai Rajan, Sajja Eswaraiah, Karamala Rama Subba Reddy, Bairy Kondal Reddy, Ghojala Venkat Reddy
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Patent number: 8192589Abstract: The invention relates to a method and a device for the purification of an aqueous solution of an organic acid having a boiling point at atmospheric pressure of less than 450° C., which further has approximately 275 g carboxylate ions/l or less, preferably 250 g carboxylate ions/l or less, and preferably less than 1% by weight ionic impurities, calculated on the basis of the total solution. In particular, the invention relates to a method and a device for the continuous purification and concentration, on an industrial scale, of an aqueous solution of an organic acid having a boiling point at atmospheric pressure of less than 450° C. According to the method, this solution is subjected to two or more distillation steps, the first distillation step being carried out at a temperature of from 80° to 150° C. and a pressure of from 50 to 250 mbar, and the second distillation step being carried out at a temperature of from 80° to 200° C. and a pressure of from 0.01 to 50 mbar.Type: GrantFiled: December 20, 2010Date of Patent: June 5, 2012Assignee: Purac Biochem B.V.Inventors: Hendrik Martinus Winkelaar, Jan Van Breugel, Margarita Camprubi Vilá, José Maria Vidal Lancis
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Patent number: 8163138Abstract: A method for processing effluent from a chloromethylation of a vinyl aromatic polymer wherein the effluent includes catalyst and volatile organics, and wherein the method includes the steps of: 1) deactivating at least a portion of the catalyst; 2) distilling the effluent; 3) adding caustic to the effluent; and 4) distilling the effluent.Type: GrantFiled: May 23, 2007Date of Patent: April 24, 2012Assignee: Dow Global Technologies LLCInventors: William I. Harris, Bruce S. Holden, Doreen C. Keptner, David C. McDonald
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Patent number: 7976818Abstract: A method for continuously recovering titanium tetrachloride TiCl4 from a waste liquid comprising TiCl4 and by-products, wherein said waste liquid is subjected, as a flowing liquid film, to an evaporation step for a residence time of less than 15 minutes at a temperature higher than 90° C.Type: GrantFiled: November 21, 2005Date of Patent: July 12, 2011Assignee: Basell Poliolefine Italia s.r.l.Inventors: Paolo Vincenzi, Rosa Spoto, Matteo Badalocchi
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Patent number: 7846304Abstract: The present invention provides a process for purifying 2-chloro-5-chloromethyl-1,3-thiazole represented by the formula (I): characterized in that a crude 2-chloro-5-chloromethyl-1,3-thiazole represented by the formula (I) is treated with a lower alcohol before the distillation, and then is distilled. The present purification process is a new one for purifying 2-chloro-5-chloromethyl-1,3-thiazole, suitable for industrial practice.Type: GrantFiled: March 30, 2009Date of Patent: December 7, 2010Assignee: Toyo Boseki Kabushiki KaishaInventors: Toshikazu Oga, Toru Kofukuda
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Patent number: 7670464Abstract: Process for distillatively separating a mixture containing a vinyl ether of the general formula (I) R1—O—CH?CH2??(I) and alcohol of the general formula (II) R2—OH??(II) in which R1 and R2 are each independently a saturated or unsaturated, aliphatic or cycloaliphatic radical having from 2 to 10 carbon atoms, and in which the alcohol (II) has a boiling point which is at least 1° C. higher, measured at or extrapolated to 0.1 MPa abs, than the vinyl ether (I), by a) passing the mixture into a first distillation column and withdrawing, as a top product, an azeotrope containing vinyl ether (I) and alcohol (II) and, as a bottom product, a stream enriched with the alcohol (II); b) passing the azeotrope containing vinyl ether (I) and alcohol (II) from the first distillation column into a second distillation column which is operated at a pressure which is from 0.Type: GrantFiled: June 8, 2004Date of Patent: March 2, 2010Assignee: BASF AktiengesellschaftInventors: Katrin Klass, Heike Becker, Regina Vogelsang, Alexander Hauk, Markus Siegert, Jochem Henkelmann
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Patent number: 7666282Abstract: The invention is a process for the purification of ethanol. In one embodiment the process includes boiling a degassed beer feed (106) in a pre-boiler (110) to provide a vapor by-pass fraction (112) that by-passes the conventional beer column and is fed into the rectifier column (124). The process allows free capacity in the rectifier column of new or established plants to be filled by ethanol-water vapor and/or condensate streams that do not originate from the beer column.Type: GrantFiled: December 28, 2005Date of Patent: February 23, 2010Assignee: E.I. du Pont de Nemours and CompanyInventors: Robert G. Sylvester, Stephen Thomas Breske, David A. Culver, Bruce M. Vrana
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Patent number: 7592468Abstract: ?9 THC acid is obtained from plant material and extracted into an aqueous solvent under conditions of pH control. The acid is converted to a salt and the salt extracted into a polar solvent, yielding acid of high purity. The ?9 THC acid is then converted to ?9 THC which is further purified and combined with a carrier for pharmaceutical use.Type: GrantFiled: July 30, 2004Date of Patent: September 22, 2009Assignee: Resolution Chemicals LimitedInventors: Neil J Goodwin, Nicolas J. Archer, Christopher Murray, Alan K. Greenwood, Derek Mchattie
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Patent number: 7572353Abstract: A process arrangement for distilling fuel grade ethanol include a distillation portion which distills beer to produce thin stillage and hot ethanol vapor. In an evaporation portion, a set of first effect evaporators which are heated either by plant steam or hot ethanol vapor, concentrate thin stillage into mid stillage while producing first effect steam. The first effect steam from the first effect evaporators provides heat to a set of second effect evaporators which concentrate the mid stillage into a syrup for further drying. The second effect evaporators produce second effect steam which is used to heat the distillation portion of the process arrangement. The multiple evaporators of the first and second effects of the evaporation portion can be selectively taken off-line for maintenance while the evaporation portion and the remainder of the process arrangement continue to operate at full capacity.Type: GrantFiled: August 23, 2006Date of Patent: August 11, 2009Assignee: ICM, Inc.Inventor: Dennis Lee Vander Griend
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Patent number: 7497931Abstract: The invention relates to a process for recovering 3-aminomethyl-3,5,5-trim-ethylcyclohexylamine (isophoronediamine, IPDA) having a fractionally distilled cis/trans isomer ratio of at least 73/27. The process includes the following steps: a) providing IPDA in a cis/trans isomer ratio of <73/27; b) feeding IPDA into the middle region of a distillation column having internals and distilling the IPDA in this distillation column at a temperature of from 5 to 300.degree. C.Type: GrantFiled: August 8, 2003Date of Patent: March 3, 2009Assignee: BASF AktiengesellschaftInventors: Frank Funke, Thomas Hill, Jobst Rüdiger Von Watzdorf, Wolfgang Mattmann, Wolfgang Harder, Erhard Henkes, Gerd Littmann, Manfred Julius
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Patent number: 7473338Abstract: A distillation apparatus for subjecting a crude readily polymerizable compound to distillation under vacuum conditions to purify it, the distillation apparatus having a distillation column and a vacuum generator and an exhaust gas conduit of the vacuum generator connected to a connecting conduit therebetween through a pressure control valve. A method provides purifying of a readily polymerizable compound by subjecting a crude readily polymerizable compound to distillation under vacuum conditions to purify it, the method including using a distillation apparatus having a distillation column and a vacuum generator and an exhaust gas conduit of the vacuum generator connected to a connecting conduit therebetween through a pressure control valve and controlling the action of the pressure control valve based on a pressure of the distillation column.Type: GrantFiled: July 26, 2005Date of Patent: January 6, 2009Assignee: Mitsubishi Chemical CorporationInventors: Shuhei Yada, Yasushi Ogawa, Yoshiro Suzuki, Kenji Takasaki, Kiyoshi Takahashi
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Patent number: 7449088Abstract: The present invention relates to a new process for obtaining fatty acids with improved color, odor and heat stability which is characterized in that: (a) in a first step the crude acids are fed to a rectification (“precut”) column in order to remove low boiling by-products being present in the starting material as a top fraction, and (b) in a second step the bottom fraction of the precut column is fed to a sidestream column in order to obtain the pure fatty acids as the side fraction, to remove low boiling by-products which have been formed in the course of the first distillation as a top fraction and to remove high boiling by-products, either being present from the starting material or formed during the first distillation, with the residue.Type: GrantFiled: March 31, 2005Date of Patent: November 11, 2008Assignee: Cognis Oleochemicals GmbHInventors: Nataly Lausberg, Horst Josten, Georg Fieg, Thomas Kapala, Ralf Christoph, Andreas Suessenbach, Andreas Heidbreder, Ingomar Mrozek, Albrecht Schwerin
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Patent number: 7052582Abstract: A wave powered evaporation desalination system for removing fresh water from salt water by extraction of water vapor from a negative pressure container using wave motion for power. The wave powered evaporation desalination system includes a first vessel that accepts salt water. The salt water is forced from the first vessel through a atomizing spray nozzle into the top of a negative pressure second vessel. The negative pressure second vessel includes a number of trays that fill up with salt water films. Two pumps are attached to the top of the second vessel. One pump draws brine from the bottom of the second vessel for dispersion outside the system. The other pump draws off the water vapor from the second vessel into a hose and back to normal atmospheric pressure. The two pumps are powered by a float hinged to the second vessel.Type: GrantFiled: July 23, 2002Date of Patent: May 30, 2006Inventor: Yousry E. Madkour
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Patent number: 7005544Abstract: A method for effectively preventing polymerization of acrylic acid during an azeotropic dehydration distillation in an acrylic acid manufacturing process and thus enabling stable operation of the azeotropic dehydration column over an extended period of time. The acrylic acid is separated in an azeotropic dehydration column from an acrylic acid aqueous solution fed therein, and the method includes withdrawing from the bottom of the azeotropie dehydration column a bottom effluent containing 50% or more of glyoxal (including the hydrates thereof) contained in the acrylic acid aqueous solution fed into the azeotropic dehydration column.Type: GrantFiled: August 29, 2003Date of Patent: February 28, 2006Assignee: Nippon Shokubai Co., Ltd.Inventors: Kazuo Ohkouchi, Tomohiro Nakae, Kazuhiko Sakamoto
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Patent number: 6982026Abstract: Disclosed herein are methods for the recovery of at least one of an organic acid or an organic acid amide, such as a heat stable lactic acid or lactamide, from a feed stream which contains the organic acid and/or organic acid amide. The feed stream is mixed with at least one azeotroping agent. The azeotroping agent is a hydrocarbon capable of forming at least one heteroazeotrope with the organic acid or the organic acid amide in the feed stream. The mixture of the feed stream and the azeotroping agent is heated to produce a vapor stream. The heteroazeotrope is a component of that vapor stream. The vapor stream can be heated further to separate components or it can be condensed into a liquid stream. The liquid stream is capable of being separated into a first phase and a second phase. The first phase contains the highest concentration of the organic acid and/or the organic acid amide and the azeotroping agent is part of the second phase.Type: GrantFiled: March 15, 2001Date of Patent: January 3, 2006Assignee: Tate & Lyle Ingredients Americas, Inc.Inventors: Michael Charles Milner Cockrem, Istvan Kovacs
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Patent number: 6946055Abstract: An organic solvent is separated from a waste stream containing supercritical CO2, an organic solvent and etchant contaminants. The process includes separating the supercritical CO2 by subjecting the waste stream to elevated temperature and/or reduced pressure to thereby obtain a first composition containing the supercritical CO2 and a second composition containing the organic solvent and being substantially free of the supercritical CO2; and then removing non-volatile etching contaminants from the second stream search as by at least one of the following: evaporation; distillation; filtration; centrifugation; and settling.Type: GrantFiled: August 22, 2001Date of Patent: September 20, 2005Assignee: International Business Machines CorporationInventors: Anilkumar C. Bhatt, Jerome J. Wagner
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Patent number: 6905576Abstract: This invention relates to a continuous process for the preparation of silane by catalytic disproportionation of trichlorosilane in a reactive/distillative reaction zone having a catalyst bed of catalytically active solid.Type: GrantFiled: December 14, 1999Date of Patent: June 14, 2005Assignee: SolarWorld AGInventors: Hans-Dieter Block, Hans-Joachim Leimkühler, Dirk Müller, Johannes-Peter Schäfer, Georg Ronge
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Patent number: 6821382Abstract: A method and apparatus for cleaning condensate, produced during the production of cellulose pulp, including evaporation of spent liquor, utilizing a cleaning plant having several condensers, coupled in series. Process steam from the last evaporation stage and unclean condensate are introduced into a combined stripper/condenser, the process steam and the condensate being brought to flow in opposite directions so that direct heat exchange occurs, resulting in volatile compounds of the condensate being separated and taken up by the steam with simultaneous indirect cooling, resulting in condensation of the main part of the process steam, and the remaining process steam gradually flowing further on, the process steam being successively cooled first resulting in water and turpentine being condensed and collected and subsequently methanol being condensed.Type: GrantFiled: January 29, 2001Date of Patent: November 23, 2004Assignee: Papsea ABInventor: Allan Lundgren
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Patent number: 6821394Abstract: The present invention relates to a process of extracting haw pits by dry distillation and the device used therein. The process includes the following steps: removing the impurities of haw pits and drying them; immersing haw pits in water and then dripping and charging the dried pit into the furnace for dry distillation; gradually raising the temperature and dry distilling the haw pits at two temperature ranges of 105-195° C. and 305-380° C. respectively and collecting the distillate; mixing together the distillate, allowing them to separate into layers by specific gravity difference and separating out the final brownish red transparent liquor by siphon. The method of the present invention can provide high yield of extraction and the present device is simple in structure. Further, the present invention is easy to be employed on the industrial scale.Type: GrantFiled: April 21, 2003Date of Patent: November 23, 2004Inventor: Yi Shi
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Publication number: 20040182690Abstract: A method for recovering hexamethylene diamine (HMD) from a mixture comprising HMD, 6-aminocapronitrile (ACN) tetrahydroazepine (THA), and ADN comprising:Type: ApplicationFiled: March 7, 2003Publication date: September 23, 2004Inventor: John J. Ostermaier
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Patent number: 6793777Abstract: The invention relates to a method for separating and purifying an aqueous mixture that mainly consists of acetic acid, formic acid and high-boiling substances by extraction with a solvent in a cyclic process. The inventive method is characterized in that the flow of raffinate is fed to a solvent stripping column (11) with the major part of the water in order to remove the water from the cycle. The flow of extract is fed to a solvent recovery distillation column (8). In a first step, a mixture (A) that consists of water and solvent, is separated by overhead distillation. A mixture (B) that consists of acetic acid, formic acid and high-boiling substances is separated via a sump. Once the formic acid is removed in a column (29), mixture (B) is separated in an acetic acid distillation column to give pure acetic acid and high-boiling substances.Type: GrantFiled: December 5, 2001Date of Patent: September 21, 2004Assignee: Consortium für Elektrochemische Industrie GmbHInventors: Christoph Rüdinger, Harald Herbert Voit, Michael Hallmann, Mehmet Günaltay, Barbara Reil, Hans-Jürgen Eberle
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Patent number: 6780288Abstract: Process for the manufacture of a concentrated solution, like a concentrated aqueous hydrogen peroxide solution, by distillation and evaporation of a dilute solution, in which the distillation and the evaporation are carried out in two distinct pieces of equipment which are easy to dismantle and to transport. Aqueous hydrogen peroxide solutions having a concentration of at least 90% are obtainable.Type: GrantFiled: October 5, 2000Date of Patent: August 24, 2004Assignee: Solvay S.A.Inventors: Stephen Bloomfield, Graham E. Williams
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Publication number: 20040000470Abstract: A method to purify N,N-dimethylacetamide (DMAc) from an aqueous solution containing acetic acid as a contaminant. Two fractional distillation columns are arranged in a series. The solution containing the contaminant is provided to the first column with a temperature profile to result in acetic acid partitioning into the overhead water. The material remaining in the bottom portion of the first column is recycled to the first column and also provided into a second column, whereby DMAc free of acetic acid contamination is recovered, and remaining DMAc and acetic acid are returned to the first column for further separation. The method uses standard fractional distillation procedures and equipment, thus eliminating the need for more complex extractions and/or chromatographic separations.Type: ApplicationFiled: July 1, 2002Publication date: January 1, 2004Applicant: MALLINCKRODT INC.Inventor: Michael J. Gentilcore
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Patent number: 6635150Abstract: A method for distilling a fluid which is useful, for instance, in eliminating salt from brackish and/or sea water includes percolating films on plates with multiple effects having several evaporating zones and condensation zones. The evaporation zones (EVAP) and the condensation zones (COND) are vertically arranged. The liquid to be distilled emerges in the top part of the evaporation zone (EVAP). The vapors produced in the evaporation zone (EVAP) are horizontally transferred into the condensation zone (COND) through a communicating connection. The condensed liquid percolates vertically along the walls of the condensation zone and is evacuated from the lower part of the condensation zone. A distilling plant is also provided for implementing the distilling method, and includes plural cascades made up of elementary cells alternatingly assembled in thermal series.Type: GrantFiled: January 23, 2001Date of Patent: October 21, 2003Assignee: Centre International de l'Eau de Nancy - NancieInventors: Pierre Le Goff, Jean-Marie Hornut, Viviane Renaudin
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Publication number: 20030183501Abstract: A distillation apparatus includes a column body; a partition for dividing the interior of the column body; a first distillation section composed of an enriching section and an exhaust section; a second distillation section composed of an enriching section formed above an upper end of the first distillation section, and an exhaust section located adjacent to the enriching section of the first distillation section; a third distillation section composed of an enriching section located adjacent to the exhaust section of the first distillation section, and an exhaust section formed below a lower end of the first distillation section; a condenser; a negative pressure generation system for generating a negative pressure to thereby withdraw vent gas; a gas cooler for cooling the vent gas; a first discharge system disposed at the side of the column body and adapted to discharge liquid rich in a medium-boiling-point component formed from a high-melting-point material; and a second discharge system disposed at the bottoType: ApplicationFiled: May 2, 2003Publication date: October 2, 2003Applicant: SUMITOMO HEAVY INDUSTRIES, LTD.Inventors: Katsunori Tamura, Yoichi Harada
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Publication number: 20030178295Abstract: A process for the preparation of citalopram of formula (I) 1Type: ApplicationFiled: February 10, 2003Publication date: September 25, 2003Applicant: H. LUNDBECK A/SInventors: Andrea Castellin, Giulio Volpe, Federico Sbrogio
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Publication number: 20030159914Abstract: The present invention relates to a process of extracting haw pits by dry distillation and the device used therein. The process includes the following steps: removing the impurities of haw pits and drying them; immersing haw pits in water and then dripping and charging the dried pit into the furnace for dry distillation; gradually raising the temperature and dry distilling the haw pits at two temperature ranges of 105-195° C. and 305-380° C. respectively and collecting the distillate; mixing together the distillate, allowing them to separate into layers by specific gravity difference and separating out the final brownish red transparent liquor by siphon. The method of the present invention can provide high yield of extraction and the present device is simple in structure. Further, the present invention is easy to be employed on the industrial scale.Type: ApplicationFiled: April 21, 2003Publication date: August 28, 2003Inventor: Yi Shi
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Patent number: 6605191Abstract: A process for the work up of a reaction mixture obtained from the preparation of diaryl carbonate by direct carbonylation of aromatic hydroxy compounds is disclosed. The process entails obtaining a reaction mixture that contains diaryl carbonate, aromatic hydroxy compound, water, base and quaternary salt, separating the mixture in a distillation apparatus having only one theoretical separation stage into a liquid phase and a gas phase and recycling the liquid phase without further work up to the reaction step of the direct carbonylation.Type: GrantFiled: June 15, 2001Date of Patent: August 12, 2003Assignee: Bayer AktiengesellschaftInventors: Carsten Hesse, Ursula Jansen, Johann Rechner, Claus-Peter Reisinger, Rob Eek, Kaspar Hallenberger, Martin Friedrich
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Publication number: 20030146080Abstract: A process for the preparation of propylene oxide in the presence of methanol, in which propylene oxide is separated from a mixture comprising propylene oxide and methanol, and the resultant mixture comprising methanol is worked up, which comprises separating methanol from a mixture comprising methanol and methyl formate during the work-up.Type: ApplicationFiled: January 2, 2003Publication date: August 7, 2003Inventors: Joaquim Henrique Teles, Alwin Rehfinger, Peter Bassler, Anne Wenzel, Norbert Rieber, Peter Rudolf
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Publication number: 20030133864Abstract: The invention disclosed herein generally relates to a system and a method for supplying a carbon dioxide fluid feed to a plurality of applications. The method of the invention comprises the steps of directing a fluid feed, that includes a carbon dioxide component, from a carbon dioxide purifying means to a plurality of applications including at least two distinct applications, whereby contaminants are combined with the fluid at said applications, thereby forming an effluent that includes at least a portion of the carbon dioxide component and at least a portion of said contaminants; directing said effluent from at least one of the applications to said carbon dioxide purifying means; and purifying the carbon dioxide of the effluent at the carbon dioxide purifying means, thereby producing the carbon dioxide component of the fluid feed. The system of the invention is an apparatus for conducting the method of the invention.Type: ApplicationFiled: October 17, 2002Publication date: July 17, 2003Applicant: Praxair Technology, Inc.Inventors: John Fredric Billingham, Henry Edward Howard, Kimberly Hershey
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Publication number: 20030047438Abstract: An object of the present invention is to reduce the number of instruments used in a distillation apparatus to thereby simplify control.Type: ApplicationFiled: October 25, 2002Publication date: March 13, 2003Applicant: SUMITOMO HEAVY INDUSTRIES, LTD.Inventors: Katsunori Tamura, Ken Nishiyama, Taizo Inoue, Keiji Yoshimoto, Noboru Okamoto, Minoru Nagashima
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Patent number: 6514388Abstract: A process for the distillative recovery of high purity monoethylene glycol from the hydrolysis product of ethylene oxide by pressure dewatering, vacuum dewatering and subsequent purifying distillation, which includes the pressure dewatering columns or at least the first pressure dewatering column of the battery (2, 3, 4) having a stripping section with at least one separating stage, preferably with from 2 to 10 separating stages, particularly preferably with from 3 to 6 stages, and a portion of the overhead stream of the pressure dewatering column(s) (2, 3, 4) having a stripping section being removed from the system.Type: GrantFiled: January 24, 2001Date of Patent: February 4, 2003Assignee: BASF AktiengesellschaftInventors: Till Adrian, Bernd Bessling, Hans Hasse, Frans Vansant, Gerhard Theis
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Publication number: 20020175066Abstract: The invention relates to a circulation evaporator for separating mixtures consisting of more volatile and less volatile components, which comprises a discharge container that consists of at least a chamber for the feed and of a chamber for the outflow. The invention further relates to a process for the separation by distillation of a mixture consisting of more volatile and less volatile components by employing the circulation evaporator.Type: ApplicationFiled: May 16, 2002Publication date: November 28, 2002Inventors: Kurt-Manfred Kupper, Andre Fellholter
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Patent number: 6464839Abstract: This invention provides an anti-cancer composition of high purity beta-elemene extracted from plant sources. This invention also provides for the use of the composition as well as a low cost method to prepare it by multiple passes through the precision distillation tower.Type: GrantFiled: April 19, 2000Date of Patent: October 15, 2002Assignee: Yuan da International Group LimitedInventors: Yuren Chen, Xiu Ying Wu