Purification Or Recovery Patents (Class 568/492)
  • Patent number: 10364164
    Abstract: Cross-linked polymeric resins from anilines linked together with polyamine alkyl chains. A process for producing the cross-linked polymeric resins by Mannich-type polycondensation of anilines and diaminoalkanes linked together by an aldehyde and subsequent basification. In addition, a method for removing heavy metals, such as Pb (II) and As (V) from aqueous solution via contacting and treatment with the cross-linked polymeric resins.
    Type: Grant
    Filed: August 16, 2016
    Date of Patent: July 30, 2019
    Assignee: King Fahd University of Petroleum and Minerals
    Inventors: Othman Charles Sadeq Al Hamouz, Oluwafemi S. Akintola, Tawfik Abdo Saleh Awadh
  • Patent number: 9469624
    Abstract: A process for producing cyclic acetals is described. A formaldehyde source is contacted with an aprotic compound in the presence of a catalyst to produce the cyclic acetals. The aprotic compound can increase conversion rates and/or efficiency. In one embodiment, the formaldehyde source is obtained from methanol. In particular, methanol can be converted into formaldehyde which is then converted into a cyclic acetal. In one embodiment, the cyclic acetal can then be used to produce oxymethylene polymers.
    Type: Grant
    Filed: November 23, 2012
    Date of Patent: October 18, 2016
    Assignee: Ticona GmbH
    Inventors: Michael Haubs, Michael Hoffmockel, Klaus Kurz, Jurgen Lingnau, Damian Feord
  • Patent number: 9340480
    Abstract: A hydroformylation system for making aldehyde by reacting olefin with synthesis gas by way of hydroformylation is improved by multi-stage condensation of gaseous reactor effluent for providing liquid feed to a gas-liquid contact zone. The process provides for condensing and separating the gaseous reactor output stream in a plurality of successive condenser stages into gaseous condenser output streams and liquid condenser output streams having differing temperatures and feeding the recovered liquid to the gas-liquid contact zone to improve olefin recovery by stripping.
    Type: Grant
    Filed: November 11, 2013
    Date of Patent: May 17, 2016
    Assignee: OXEA CORPORATION
    Inventors: Markus Heuwes, Bakulesh N. Shah
  • Publication number: 20140303338
    Abstract: A process for producing acrolein, comprising: a glycerin dehydration step of conducting dehydration reaction of glycerin to obtain an acrolein-containing gas; a partial-condensation step of cooling the acrolein-containing gas to condense a part of acrolein, water and a high-boiling substance contained in the acrolein-containing gas, thereby obtaining a purified gas and a condensate; and a separation step of separating the purified gas from the condensate; wherein a polymerization inhibitor is added to the acrolein-containing gas or the condensate in the partial-condensation step.
    Type: Application
    Filed: September 25, 2012
    Publication date: October 9, 2014
    Applicant: Nippon Shokubai Co., Ltd.
    Inventors: Hideaki Tsuneki, Masanori Nonoguchi, Koji Nishi
  • Publication number: 20140221686
    Abstract: Improvement in separating lower carboxylic acids from aqueous streams via liquid-liquid extraction with pressurized liquefied propylene and/or propane, wherein carboxylic acid is transferred from the aqueous phase into the liquid solvent phase (extract). The extracted carboxylic acids are recovered as a liquid concentrate by evaporating off the propylene and/or propane solvent from the extract at mild temperatures.
    Type: Application
    Filed: March 24, 2014
    Publication date: August 7, 2014
    Applicant: Arkema Inc.
    Inventor: Steven G. Schon
  • Publication number: 20140221688
    Abstract: Disclosed is a process for recovering a water-soluble complex mixture of organic compounds from an aqueous stream through extraction and/or through contact of the aqueous stream with a sorbent or sorbents selected from the group consisting of polymeric microreticular sorbent resins, zeolite-based adsorbents, clay-based adsorbents, activated carbon-based sorbents, and mixtures thereof; and including methods to recover the removed organic compounds.
    Type: Application
    Filed: February 7, 2013
    Publication date: August 7, 2014
    Applicant: KIOR, Inc.
    Inventors: Maria Magdalena Ramirez Corredores, Xiaowei Tong, Rocio Maria Banda, Royce Roemisch
  • Publication number: 20140024861
    Abstract: [Problem] Catalyst for use in selective reduction of propionaldehyde in acrolein and/or acrylic acid and/or acrylonitrile containing propionaldehyde and/or propionic acid and/or propionitrile at low concentration. In particular, a novel catalyst for selectively reducing propionaldehyde from acrolein containing the propionaldehyde. [Solution] Catalyst for use in selective reduction of propionaldehyde in acrolein containing the propionaldehyde, characterized in that the catalyst contains Mo as an indispensable component, and at least one element selected from a group comprising P, Si, W, Ti, Zr, V, Nb, Ta, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, In, Tl, Sn, Ag, As, Ge, B, Bi, La, Ba, Sb, Te, Ce, Pb, Mg, K, Rb, Cs and Al.
    Type: Application
    Filed: January 26, 2012
    Publication date: January 23, 2014
    Applicant: NIPPON KAYAKU KABUSHIKI KAISHA
    Inventors: Kimito Okumura, Toru Kawaguchi, Yasushi Kobayashi
  • Patent number: 8604234
    Abstract: The invention relates to a method for preparing acrolein from glycerol or glycerin, according to which dehydration of glycerol or glycerin is carried out in the presence of a catalyst which consists in at least one silica modified with zirconium dioxide, titanium dioxide or tungsten trioxide or any combination of these oxides, and a heteropolyacid. This method may be used for making 3-(methylthio)propionic aldehyde (MMP), 2-hydroxy-4-methylthiobutyronitrile (HMBTN), methionine or its analogs, from acrolein.
    Type: Grant
    Filed: December 21, 2010
    Date of Patent: December 10, 2013
    Assignees: Adisseo France S.A.S., Centre National de la Recherche Scientifique, Universite Lille 1-Sciences et Technologies
    Inventors: Sebastien Paul, Benjamin Katryniok, Franck Dumeignil, Mickael Capron
  • Patent number: 8461396
    Abstract: A process for purifying an aqueous glyoxal solution comprising at least one acid by extractive acid removal, comprising i) mixing and dispersion of the aqueous glyoxal solution with an ion exchanger solution comprising a tertiary amine and an organic solvent, ii) phase separation and removal of the ion exchanger solution laden with the acid from the aqueous glyoxal solution, and iii) regeneration of the ion exchanger solution by contacting with a basic compound for neutralization of the acid and removal of the basic compound, iv) mixing and dispersion of the ion exchanger solution with water to obtain a dispersion of water and ion exchanger solution, v) Phase separation and removal of the aqueous phase from the ion exchanger solution in such a way that the content of the aqueous phase of the regenerated ion exchanger solution is <1% by weight, and recycling of the ion exchanger solution into step i).
    Type: Grant
    Filed: October 3, 2011
    Date of Patent: June 11, 2013
    Assignee: BASF SE
    Inventors: Petra Deckert, Peter Groll, Bernd Rumpf, Christian Horn
  • Publication number: 20130045318
    Abstract: To provide a salty taste enhancer which exerts a flavor enhancing effect comparable to sodium chloride without imparting any undesirable flavor such as harsh taste or odd smell, a method for producing the same, a kelp extract comprising the salty taste enhancer, and a food or drink having enhanced salty taste and flavor which comprises the salty taste enhancer or the kelp extract. A salty taste enhancer which comprises a volatile component with a molecular weight of less than 200 derived from a kelp.
    Type: Application
    Filed: April 8, 2011
    Publication date: February 21, 2013
    Applicant: TAKASAGO INTERNATIONAL CORPORATION
    Inventors: Akihiko Watanabe, Azusa Nakatoh, Takeshi Oikawa
  • Patent number: 8273313
    Abstract: A system and process for separating methacrolein (MA) from methacrylic acid (MAA) and acetic acid in the gas phase product from partial oxidation of isobutylene (IB) in two oxidation steps is disclosed. The process and system maximize recovery of all three components at minimum capital and energy cost, under conditions that minimize polymerization conditions and plugging by solids deposition in compressors, columns, etc.
    Type: Grant
    Filed: August 9, 2010
    Date of Patent: September 25, 2012
    Assignee: Saudi Basic Industries Corporation
    Inventor: Frederick Merrill Galloway
  • Patent number: 8247618
    Abstract: Oxidative recovery methods that use oxygen or air for recovery of homogeneous metal catalysts, such as cobalt catalysts, used in for example hydroformylation processes, can be hazardous. Explosive or flammable gas mixtures may be generated inside the process equipment, which can deflagrate upon any ignition source such as a static electricity discharge. The use of a flammable diluent has been found to be a very effective way of optimizing the recovery method, by bringing the resulting gas mixtures above their upper flammability limit. The offgas produced is then also easier to dispose of as a fuel, as compared to when a non-flammable diluent is used.
    Type: Grant
    Filed: March 31, 2008
    Date of Patent: August 21, 2012
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Kenneth J. Buturla, James T. Ritchie, Ronald D. Garton, Eddy T. A. Van Driessche
  • Publication number: 20120172579
    Abstract: The present invention provides methods, reactor systems, and catalysts for converting in a continuous process biomass to less complex oxygenated compounds for use in downstream processes to produce biofuels and chemicals. The invention includes methods of converting the components of biomass, such as hemicellulose, cellulose and lignin, to water-soluble materials, including lignocellulosic derivatives, cellulosic derivatives, hemicellulosic derivatives, carbohydrates, starches, polysaccharides, disaccharides, monosaccharides, sugars, sugar alcohols, alditols, polyols, diols, alcohols, ketones, cyclic ethers, esters, carboxylic acids, aldehydes, and mixtures thereof, using hydrogen and a heterogeneous liquefaction catalyst.
    Type: Application
    Filed: December 29, 2011
    Publication date: July 5, 2012
    Inventors: Ming Qiao, Randy D. Cortright, John Kania, Elizabeth Woods
  • Publication number: 20120114742
    Abstract: Methods are provided for the preparation of conjugates of a variety of bioactive components, especially proteins, with water-soluble polymers (e.g., poly(ethylene glycol) and derivatives thereof), which conjugates have reduced antigenicity and immunogenicity compared to similar conjugates prepared using poly(ethylene glycol) containing a methoxyl or another alkoxyl group. The invention also provides conjugates prepared by such methods, compositions comprising such conjugates, kits containing such conjugates or compositions and methods of use of the conjugates and compositions in diagnostic and therapeutic protocols.
    Type: Application
    Filed: January 13, 2012
    Publication date: May 10, 2012
    Applicant: Mountain View Pharmaceuticals, Inc.
    Inventors: Alexa L. MARTINEZ, Merry R. Sherman, Mark G.P. Saifer, L. David Williams
  • Publication number: 20120116129
    Abstract: A process for purifying an aqueous glyoxal solution comprising at least one acid by extractive acid removal, comprising i) mixing and dispersion of the aqueous glyoxal solution with an ion exchanger solution comprising a tertiary amine and an organic solvent, ii) phase separation and removal of the ion exchanger solution laden with the acid from the aqueous glyoxal solution, and iii) regeneration of the ion exchanger solution by contacting with a basic compound for neutralization of the acid and removal of the basic compound, iv) mixing and dispersion of the ion exchanger solution with water to obtain a dispersion of water and ion exchanger solution, v) Phase separation and removal of the aqueous phase from the ion exchanger solution in such a way that the content of the aqueous phase of the regenerated ion exchanger solution is <1% by weight, and recycling of the ion exchanger solution into step i).
    Type: Application
    Filed: October 3, 2011
    Publication date: May 10, 2012
    Applicant: BASF SE
    Inventors: Petra Deckert, Peter Groll, Bernd Rumpf, Chistian Horn
  • Publication number: 20120029229
    Abstract: An industrially advantageous method for producing a high purity terminal olefin is disclosed, comprising the steps of (a) contacting a mixture comprising a terminal olefin represented by formula (1): and one or more corresponding internal olefins as impurities, with a brominating agent in the presence of water or an alcohol, to convert the internal olefin(s) to compound(s) having a higher boiling point than the terminal olefin; and (b) purifying the terminal olefin by distillation from the reaction mixture.
    Type: Application
    Filed: January 8, 2010
    Publication date: February 2, 2012
    Applicant: KURARAY CO., LTD.
    Inventors: Kei Miyoshi, Goro Asanuma
  • Patent number: 8062482
    Abstract: A method for removing acetaldehyde from a mixture of methyl acetate, methanol and acetaldehyde includes: (a) feeding the mixture of methyl acetate, methanol and acetaldehyde to a distillation column; (b) distilling the feed mixture of methyl acetate methanol and acetaldehyde at a pressure of 10 psig or more to generate an overhead vapor stream enriched in acetaldehyde as compared with the feed mixture and a residue stream depleted in acetaldehyde as compared with the feed mixture; and (c) withdrawing the residue stream depleted in acetaldehyde from the distillation column.
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: November 22, 2011
    Assignee: Celanese International Corporation
    Inventor: R. Jay Warner
  • Publication number: 20110201842
    Abstract: Improvement in separating lower carboxylic acids from aqueous streams via liquid-liquid extraction with pressurized liquefied propylene and/or propane, wherein carboxylic acid is transferred from the aqueous phase into the liquid solvent phase (extract).
    Type: Application
    Filed: September 23, 2009
    Publication date: August 18, 2011
    Applicant: Arkema Inc.
    Inventor: Steven G. Schon
  • Patent number: 7964756
    Abstract: Disclosed is a process for absorbing methylacrolein, characterized in that it absorbs methylacrolein by an absorbent comprising an ionic liquid. The absorbent can absorb methylacrolein effectively, and it is easy to be separated from methylacrolein, regenerated and recycled. It is a green absorbent. The technique is a green methylacrolein absorbing and separating technique.
    Type: Grant
    Filed: March 10, 2008
    Date of Patent: June 21, 2011
    Assignee: Institute of Process Engineering, Chinese Academy of Sciences
    Inventors: Suojiang Zhang, Qiong Chen, Ruiyi Yan, Lei Wang, Yuhuan Chen, Xiaoliang Yuan
  • Patent number: 7943047
    Abstract: Process for the treatment of wastewater from an aldolization process which is contaminated with water-soluble and/or dispersed organic impurities by means of single-stage or multistage extraction with an organic liquid of the aldolization process wastewater which has been set to a pH of from 0 to 6, in which an organic liquid obtained by stripping of the acidified aldolization process wastewater or of the acidified and extracted aldolization process wastewater, condensation of the stripped compounds and phase separation of the condensate is used as extractant for the extraction of organic impurities from the acidified aldolization process wastewater and wastewater having a lower content of organic impurities than the aldolization process wastewater fed to the extraction is taken off from the stripping apparatus.
    Type: Grant
    Filed: September 25, 2006
    Date of Patent: May 17, 2011
    Assignee: BASF SE
    Inventors: Siegmar Maassen, Roland Krokoszinski, Detlef Kratz
  • Publication number: 20110021846
    Abstract: Disclosed is a process for absorbing methylacrolein, characterized in that it absorbs methylacrolein by an absorbent comprising an ionic liquid. The absorbent can absorb methylacrolein effectively, and it is easy to be separated from methylacrolein, regenerated and recycled. It is a green absorbent. The technique is a green methylacrolein absorbing and separating technique.
    Type: Application
    Filed: March 10, 2008
    Publication date: January 27, 2011
    Applicant: INSTITUTE OF PROCESS ENGINEERING, CHINESE ACADEMY OF SCIENCES
    Inventors: Suojiang ZHANG, Qiong CHEN, Ruiyi YAN, Lei WANG, Yuhuan CHEN, Xiaoliang YUAN
  • Patent number: 7786323
    Abstract: (Meth)acrolein or (meth)acrylic acid is collected by bringing a reaction gas (1) containing (meth)acrolein or (meth)acrylic acid obtained through a vapor-phase catalytic oxidation reaction into contact with an aqueous solution as a collecting solvent in a collecting tower main body (2). The reaction gas (1) is supplied to the collecting tower main body (2) from two nozzles (2c) facing each other, and is caused to collide in the collecting tower main body (2). According to the present invention, (meth)acrolein or (meth)acrylic acid can be efficiently collected from a gas containing (meth)acrolein or (meth)acrylic acid while preventing polymerization.
    Type: Grant
    Filed: May 16, 2006
    Date of Patent: August 31, 2010
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Shuhei Yada, Yasushi Ogawa, Kenji Takasaki, Yoshiro Suzuki, Kimikatsu Jinno
  • Publication number: 20100105944
    Abstract: Oxidative recovery methods that use oxygen or air for recovery of homogeneous metal catalysts, such as cobalt catalysts, used in for example hydroformylation processes, can be hazardous. Explosive or flammable gas mixtures may be generated inside the process equipment, which can deflagrate upon any ignition source such as a static electricity discharge. The use of a flammable diluent has been found to be a very effective way of optimizing the recovery method, by bringing the resulting gas mixtures above their upper flammability limit. The offgas produced is then also easier to dispose of as a fuel, as compared to when a non-flammable diluent is used.
    Type: Application
    Filed: March 31, 2008
    Publication date: April 29, 2010
    Inventors: Kenneth J. Buturla, James T. Ritchie, Ronald D. Garton, Eddy T.A. Van Driessche
  • Patent number: 7531066
    Abstract: A process for purifying an aqueous solution to obtain purified gaseous acrolein by introducing the aqueous solution into a distillation column equipped at its base with at least one boiler and at its top with at least one condenser, withdrawing a liquid mixture essentially containing water at the base of the distillation column, withdrawing a gas essentially containing acrolein and water at the top of the distillation column, cooling the gas mixture withdrawn at the top of the distillation column in the condenser, to a temperature which makes it possible to obtain, on the one hand, an aqueous condensate and, on the other hand, an acrolein-rich gas mixture, and withdrawing the acrolein-rich gas mixture.
    Type: Grant
    Filed: February 12, 2003
    Date of Patent: May 12, 2009
    Assignee: Adisseo Ireland Ltd.
    Inventors: Georges Gros, Patrick Rey, Michel Garrait
  • Patent number: 7385090
    Abstract: A method of treating an aldehyde mixture comprising a carboxylic acid and a metal cation, which method comprises: contacting the aldehyde mixture with a basic separating medium, and subsequently or simultaneously contacting with an acidic separating medium; use of the treated aldehyde mixture to prepare an alcohol; and the alcohol.
    Type: Grant
    Filed: January 31, 2007
    Date of Patent: June 10, 2008
    Assignee: Shell Oil Company
    Inventors: Glenn Charles Komplin, Joseph Broun Powell, Paul Richard Weider
  • Patent number: 7345197
    Abstract: A method for removing aldehyde impurities from acetic acid is disclosed. The method comprises extracting the aldehyde impurities from a methyl iodide solution such as the decanter heavy phase with a polyol. After the aldehyde impurities are removed, the methyl iodide heavy phase can be recycled to the carbonylation.
    Type: Grant
    Filed: June 5, 2007
    Date of Patent: March 18, 2008
    Assignee: Lyondell Chemical Technology, L.P.
    Inventors: Noel C. Hallinan, Brian A. Salisbury
  • Patent number: 7342139
    Abstract: A process for preparing a high-concentration formaldehyde solution by removing water from a lower-concentration formaldehyde solution having a formaldehyde content of from 5 to 50% by weight, in which the lower-concentration formaldehyde solution is fed to a preheater and heated in the preheater, depressurized via a pressure maintenance device and concentrated in a helical tube evaporator to give a vapor stream and the high-concentration formaldehyde solution as bottom stream, wherein the heated lower-concentration formaldehyde hyde solution is depressurized in the pressure maintenance device to give a two-phase mixture which is fed into the helical tube evaporator, is proposed.
    Type: Grant
    Filed: February 10, 2005
    Date of Patent: March 11, 2008
    Assignee: BASF Aktiengesellschaft
    Inventors: Bernd Rumpf, Eckhard Ströfer, Ortmund Lang, Neven Lang
  • Patent number: 7338579
    Abstract: A formaldehyde-containing product is separated from a formalin solution containing formaldehyde, water, and methanol by distilling in the presence of a water entraining compound, especially methyl propionate or methyl methacrylate. The product contains substantially less water than in the solution and may be used, for example, in a further process which requires a source of formaldehyde containing a relatively low level of water, for example, the catalyzed reaction of methy propionate with formaldehyde and methanol to produce methyl methacrylate.
    Type: Grant
    Filed: May 23, 2002
    Date of Patent: March 4, 2008
    Assignee: Lucite International UK Limited
    Inventor: William David Parten
  • Patent number: 7332092
    Abstract: E and Z isomers of alkene alcohols and/or alkene alcohol derivatives are separated by substantially continuously contacting an ion exchange medium which is ion exchanged with silver and/or copper ions with the feed stream comprising the E and Z isomers of at least one alkene alcohol and/or at least one alkene alcohol derivative, then removing a product stream having a higher concentration of the E or Z isomer of at least one alkene alcohol or derivative of the alkene alcohol relative to the concentration of the E or Z isomer of the alkene alcohol or derivative of the alkene alcohol in the feed stream.
    Type: Grant
    Filed: March 7, 2007
    Date of Patent: February 19, 2008
    Assignees: Calgon Carbon Corporation, InnovaAroma SA
    Inventors: Chen-Chou Chiang, Elad Shabtai
  • Patent number: 7271293
    Abstract: Disclosed is a method of controlling a separation process for removing permanganate reducing compounds from a process stream in the methanol carbonylation process for making acetic acid, where the method includes the steps of measuring the density of a stream containing acetaldehyde and methyl iodide, optionally calculating the relative concentrations of acetaldehyde and methyl iodide in the stream, and adjusting distillation or extraction process parameters based on the measured density or one or more relative concentrations calculated therefrom.
    Type: Grant
    Filed: March 2, 2004
    Date of Patent: September 18, 2007
    Assignee: Celanese International Corporation
    Inventors: David A. Trueba, Shrikant Kulkarni
  • Publication number: 20070179322
    Abstract: A method of treating an aldehyde mixture comprising a carboxylic acid and a metal cation, which method comprises: contacting the aldehyde mixture with a basic separating medium, and subsequently or simultaneously contacting with an acidic separating medium; use of the treated aldehyde mixture to prepare an alcohol; and the alcohol.
    Type: Application
    Filed: January 31, 2007
    Publication date: August 2, 2007
    Inventors: Glenn Charles Komplin, Joseph Broun Powell, Paul Richard Weider
  • Patent number: 7223883
    Abstract: An improvement of the methanol carbonylation process for manufacturing acetic acid is disclosed. Specifically disclosed is a method for removing permanganate reducing compounds (“PRC's”) from the condensed light ends overhead stream, including (a) distilling at least a portion of the condensed light ends overhead to yield a PRC enriched second overhead stream; (b) extracting the second overhead stream with water and separating therefrom an aqueous stream containing PRC's; and (c) returning at least a portion of the extracted second overhead to the second distiller.
    Type: Grant
    Filed: March 2, 2004
    Date of Patent: May 29, 2007
    Assignee: Celanese International Corporation
    Inventors: Wayne D. Picard, Jose J. Arturo Talancon, David A. Trueba, Mark O. Scates, Raymond J. Zinobile
  • Patent number: 7145043
    Abstract: Methods, compositions, and devices for alleviating the problems of toxic discharge of aldehydes present in waste streams are disclosed. The methods relate to forming neutralized aldehydes by treating aldehydes with oxidizing agents. The oxidizing agents offer a simple, effective, fast and inexpensive solution for treatment of toxic aldehydes prior to disposal into the environment.
    Type: Grant
    Filed: December 16, 2004
    Date of Patent: December 5, 2006
    Assignee: Ethicon, Inc.
    Inventor: Peter Zhu
  • Patent number: 7126030
    Abstract: In the method of the invention, hydroxypivalaldehyde (3-hydroxy-2,2-dimethylpropanal) and/or its dimer is stored under solid conditions containing an amount of water. By storing such solid conditions, hydroxypivalaldehyde and/or its dimer is stored for a long period of time without reducing its purity.
    Type: Grant
    Filed: February 24, 2005
    Date of Patent: October 24, 2006
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Yoshihiro Shiokawa, Hiroaki Shigeta, Ikutaro Kuzuhara
  • Patent number: 7012163
    Abstract: Methods, compositions, and devices for alleviating the problems of toxic discharge of aldehydes present in waste streams are disclosed. The methods relate to forming neutralized aldehydes by treating aldehydes with oxidizing agents. The oxidizing agents offer a simple, effective, fast and inexpensive solution for treatment of toxic aldehydes prior to disposal into the environment.
    Type: Grant
    Filed: January 22, 2003
    Date of Patent: March 14, 2006
    Assignee: Ethicon, Inc.
    Inventor: Peter Zhu
  • Patent number: 6936177
    Abstract: An object of the present invention is to provide a method for efficiently removing a metal from wastewater formed by subjecting the liquid waste to wet combustion treatment or wet oxidation treatment, said liquid waste resulting from an acrylic acid production process. Provided is a method for removing a metal from wastewater formed by subjecting at least a part of liquid waste to wet combustion treatment or wet oxidation treatment, said liquid waste resulting from an acrylic acid production process involving the steps of forming acrylic acid through catalytic vapor phase oxidation of at least one of propane, propylene, and acrolein, and purifying the acrylic acid through distillation, wherein the method comprises the steps of: (a) removing a solid content from the wastewater; (b) removing carbonate ions and carbonate salts from the treated liquid obtained by the step (a); and (c) removing a metal from the treated liquid from the step (b).
    Type: Grant
    Filed: May 27, 2004
    Date of Patent: August 30, 2005
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Shuhei Yada, Kenji Takasaki, Yasushi Ogawa, Yoshiro Suzuki
  • Publication number: 20040242906
    Abstract: A process for the separation of an aqueous mixture of trioxane and formaldehyde and corresponding applications are disclosed. The aqueous trioxane and formaldehyde mixture has a first trioxane:formaldehyde ratio, and the process comprises a step of reacting the aqueous mixture of trioxane and formaldehyde with urea and a step of separating an exiting vapour phase having a second trioxane:formaldehyde ratio that is higher than the first trioxane:formaldehyde ratio. Possible applications of the process are for the separation of an aqueous mixture of trioxane and formaldehyde coming from a reactor in which trioxane is being synthesized or from a distillation column in which a prior aqueous mixture of trioxane and formaldehyde is separated from the excess formaldehyde. Another possible application is for preparing raw material for the production of urea-formaldehyde glues or resins.
    Type: Application
    Filed: August 15, 2003
    Publication date: December 2, 2004
    Inventor: Lluis Eek-Vancells
  • Patent number: 6822123
    Abstract: A process is provided for the production of formaldehyde from methyl chloride. In the process methyl chloride is oxidized with air over a catalyst to give formaldehyde and hydrogen chloride. In a preferred embodiment of the invention, a mixture of two different catalysts is used, one catalyst to promote the hydrolysis of methyl chloride to methyl alcohol, and the other catalyst to oxidize the methyl alcohol so formed to formaldehyde. The reaction kinetics can be regulated by adjusting the proportion of the two catalysts in the mixture. In this manner, the release of heat from the reaction can be controlled and excessive temperatures in the catalyst mixture can be avoided.
    Type: Grant
    Filed: April 2, 2003
    Date of Patent: November 23, 2004
    Inventor: John E. Stauffer
  • Patent number: 6809224
    Abstract: Formaldehyde is removed by distillation from reaction solutions containing a methlolated alkanal which was obtained from the reaction of formaldehyde with an alkanal which has at least one acidic hydrogen atom &agr; to the carbonyl function or from the reaction of a 2-alkylacrolein or acrolein with water and formaldehyde, by a process in which this reaction was carried out in the presence of catalytic amounts of organic amine. The process permits the improved removal of formaldehyde from the reaction mixture and furthermore facilitates the hydrogenation of the alkanals thus obtained to give polyols.
    Type: Grant
    Filed: June 26, 2002
    Date of Patent: October 26, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Matthias Dernbach, Detlef Kratz, Achim Stammer, Gerhard Schulz
  • Publication number: 20040127751
    Abstract: A method for absorbing formaldehyde from gaseous mixtures that contain it, and a method for regenerating the absorption compound used.
    Type: Application
    Filed: December 31, 2002
    Publication date: July 1, 2004
    Applicant: Consiglio Nazionale Delle Ricerche
    Inventors: Francesco Cino Matacotta, Petr Nozar, Chiara Dionigi
  • Publication number: 20040097762
    Abstract: Process for removing methanol from formaldehyde-containing solutions. The present invention relates to a process for removing methanol from formaldehyde-containing solutions, with methanol being converted into formaldehyde dimethyl acetal by reactive distillation in the presence of an acidic fixed-bed catalyst, and the resultant mixture comprising methanol, formaldehyde dimethyl acetal and possibly other impurities being distilled off.
    Type: Application
    Filed: July 22, 2003
    Publication date: May 20, 2004
    Inventors: Michael Hoffmockel, Matthias Goring, Juergen Lingnau, Karl-Friedrich Muck
  • Patent number: 6727391
    Abstract: A liquid output from a continuous hydroformylation, which comprises essentially aldehydes, high-boiling by-products, a homogeneously dissolved hydroformylation catalyst, unreacted olefins, low-boiling by-products and dissolved synthesis gas, is worked up by a process in which a) the liquid hydroformylation output is depressurized in a first depressurization stage to a pressure which is from 2 to 20 bar below the reactor pressure, resulting in separation into a liquid phase and a gas phase, and b) the liquid phase obtained in the first depressurization stage is depressurized in a second depressurization stage to a pressure which is lower than the pressure of the first depressurization stage, resulting in separation into a liquid phase comprising essentially high-boiling by-products of the hydroformylation, the homogeneously dissolved hydroformylation catalyst and small amounts of hydroformylation product and unreacted olefin and a gas phase comprising essentially the major part of the hydroformylation produc
    Type: Grant
    Filed: August 8, 2002
    Date of Patent: April 27, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Karl-Heinz Walczuch, Rolf Müller, Roland Krokoszinski, Bernhard Geissler
  • Patent number: 6515187
    Abstract: A method of purifying acrolein or propionaldehyde with a single column distillation system is provided, where the distillation system has a side-draw take-off outlet for recovering purified acrolein or propionaldehyde located between the crude product feed point and the light-boiling impurities distillation site.
    Type: Grant
    Filed: June 21, 2002
    Date of Patent: February 4, 2003
    Assignee: Atofina Chemicals, Inc.
    Inventors: Steven Gabriel Schon, Samuel Marc Daniel, Richard Alan Sander
  • Publication number: 20030023119
    Abstract: Formaldehyde is removed by distillation from reaction solutions containing a methylolated alkanal which was obtained from the reaction of formaldehyde with an alkanal which has at least one acidic hydrogen atom &agr; to the carbonyl function or from the reaction of a 2-alkylacrolein or acrolein with water and formaldehyde, by a process in which this reaction was carried out in the presence of catalytic amounts of an organic amine. The process permits the improved removal of formaldehyde from the reaction mixture and furthermore facilitates the hydrogenation of the alkanals thus obtained to give polyols.
    Type: Application
    Filed: June 26, 2002
    Publication date: January 30, 2003
    Inventors: Matthias Dernbach, Detlef Kratz, Achim Stammer, Gerhard Schulz
  • Patent number: 6511583
    Abstract: In a process for the fractional distillation of a liquid crude aldehyde mixture including straight-chain and branched aldehydes, the product mixture is fractionated in a first distillation column to give a product stream of branched aldehyde, a product stream of straight-chain aldehyde and a further product stream including straight-chain aldehyde and the high boiling constituents. The further product stream is then fractionated in a second distillation column whose packing volume is a factor of from 50 to 200 smaller than that of the first distillation column to give a product stream of straight-chain aldehyde and a high boiler product stream.
    Type: Grant
    Filed: September 24, 2001
    Date of Patent: January 28, 2003
    Assignee: BASF Aktiengesellschaft
    Inventors: Rolf Müller, Willi Schönmann
  • Publication number: 20030013919
    Abstract: A liquid output from a continuous hydroformylation, which comprises essentially aldehydes, high-boiling by-products, a homogeneously dissolved hydroformylation catalyst, unreacted olefins, low-boiling by-products and dissolved synthesis gas, is worked up by a process in which
    Type: Application
    Filed: August 8, 2002
    Publication date: January 16, 2003
    Inventors: Karl-Heinz Walczuch, Rolf Mller, Roland Krokoszinski, Bernhard Geissler
  • Patent number: 6486307
    Abstract: A method of producing glucosamine hydrochloride from chitin by grinding the chitin to a very fine size and digestion with concentrated hydrochloric acid. The glucosamine hydrochloride is decolorized with activated charcoal, washed with ethanol and assayed by pH titration with a base.
    Type: Grant
    Filed: August 23, 2001
    Date of Patent: November 26, 2002
    Assignee: Alberta Research Council Inc.
    Inventors: Neena Gandhi, James Kenneth Laidler
  • Patent number: 6478929
    Abstract: A formaldehyde-containing product is separated from a formalin solution containing formaldehyde, water and methanol by distilling the solution in the presence of a water entraining compound, especially methyl propionate or methyl methacrylate. The product contains substantially less water than in the solution and may be used, for example, in a further process which requires a source of formaldehyde containing a relatively low level of water, for example, the catalyzed reaction of methyl propionate with formaldehyde and methanol to produce methyl methacrylate.
    Type: Grant
    Filed: January 22, 2001
    Date of Patent: November 12, 2002
    Assignee: Lucite International UK Limited
    Inventor: William David Parten
  • Publication number: 20020033324
    Abstract: Aldehyde compounds contained in polycyclic diols as impurities are effectively removed by distilling the polycyclic diols in the presence of an alkali metal compound and/or a alkaline earth compound. The distilled polycyclic diols are useful as a diol component of a polymer such as polycarbonate with less yellowing.
    Type: Application
    Filed: July 26, 2001
    Publication date: March 21, 2002
    Inventors: Shu Yoshida, Satoshi Nagai, Takashi Konishi, Makoto Sasaki
  • Patent number: 6353140
    Abstract: Disclosed is process for the treatment of cyclopropanecarboxaldehdye (CPCA) which contains crotonaldehyde impurity with a base at elevated temperature to convert the crotonaldehyde to one or more higher boiling compounds followed by distillation to recover CPCA substantially free of crotonaldehyde. This selective reaction may be combined with a distillation to purify CPCA or in combination with the reaction of the CPCA in the treated mixture to produce a CPCA-derivative while avoiding or minimizing the formation of the analogous crotonaldehyde derivative.
    Type: Grant
    Filed: June 8, 2001
    Date of Patent: March 5, 2002
    Assignee: Eastman Chemical Company
    Inventors: Stephen Neal Falling, Shannon Eugene Large, Robert Joseph Maleski