Sulfur Compound Removed Patents (Class 95/181)
-
Patent number: 7459011Abstract: The natural gas arriving through pipe 1 is deacidified by being brought into contact with a solvent in zone C. The solvent charged with acid compounds is regenerated in zone R. The acid gases, released into pipe 5 upon regeneration, include a quantity of solvent. The method enables the solvent contained in the acid gases to be extracted. In zone ZA, the acid gases are brought into contact with a non-aqueous ionic liquid whose general formula is Q+ A?, where Q+ designates an ammonium, phosphonium, and/or sulfonium cation, and A? designates an anion able to form a liquid salt. The solvent is removed from the acid gases evacuated through pipe 6. The ionic liquid charged with solvent is regenerated by heating in an evaporator DE. The ionic liquid regenerated is recycled through pipes 8 and 9 to zone ZA. The solvent is evacuated through pipe 13.Type: GrantFiled: February 14, 2005Date of Patent: December 2, 2008Assignee: Institut Francais du PetroleInventors: Renaud Cadours, Fabrice Lecomte, Lionel Magna, Cécile Barrere-Tricca
-
Patent number: 7189282Abstract: This invention relates to a process for cleaning gas, in particular hydrocarbonaceous gas such as e.g. natural gas, which is contaminated with sulfur in the form of H2S and mercaptans as well as CO2. To remove the undesired sulfur-containing substances in the form of H2S and mercaptan from crude gas, it is proposed in accordance with the invention that the crude gas is introduced into an absorption and regeneration column and washed therein, three gas streams being withdrawn from this absorption and regeneration column, a first exhaust gas stream being introduced into a Claus plant, a second sour gas stream with a low H2S concentration being introduced into another absorption plant, and a third gas stream, the valuable gas with the mercaptans, being cooled and supplied to an adsorption plant, that from this adsorption plant a cleaned valuable gas is withdrawn, and a mercaptan-containing gas stream is subjected to washing, that this concentrated mercaptan-containing gas is supplied to the Claus plant.Type: GrantFiled: January 22, 2003Date of Patent: March 13, 2007Assignee: Lurgi AGInventors: Karin Huder, Max-Michael Weiss
-
Patent number: 6989046Abstract: A method for removing polymer from an acid gas treating system comprising contacting an acid gas containing stream with an aqueous alkanolamine solution and hydrocarbon solvent to form a mixture of an alkanolamine rich solution having the acid gases or byproducts thereof contained therein and the hydrocarbon solvent, where the hydrocarbon solvent has about 60 to 100 volume % aromatics content; and about 50 to 85 volume % two ring aromatic content, based on the total volume of the solvent.Type: GrantFiled: March 2, 2000Date of Patent: January 24, 2006Assignee: ExxonMobil Chemical Patents Inc.Inventors: David R. Slim, Ernest V. Vilcsak
-
Patent number: 6852144Abstract: COS is selectively removed with respect to CO2 from a hydrocarbonaceous fluid stream which contains CO2 and COS. Examples of the fluid stream include a gas stream, for example natural gas, synthesis gas from heavy oil or heavy residues or refinery gas, or from liquid or liquefied hydrocarbons, for example LPG (Liquefied Petroleum Gas) or NGL (Natural Gas Liquids). The process is carried out by (1) intimately contacting the fluid stream in an absorption or extraction zone with a scrubbing liquor consisting of an aqueous amine solution containing from 1.5 to 5 mol/l of an aliphatic alkanolamine having of from 2 to 12 carbon atoms and from 0.8 to 1.7 mol/l of at least one activator selected from the group consisting of piperazine, methyl piperazine and morpholine, (2) removing the COS essentially completely from the fluid stream, and (3) separating the substantially COS-decontaminated fluid stream and the COS-loaded scrubbing liquor and discharging them from the absorption or extraction zone.Type: GrantFiled: October 4, 2000Date of Patent: February 8, 2005Assignee: BASF AktiengesellschaftInventors: Rupert Wagner, Randolf Hugo, Thomas S. Holst
-
Publication number: 20040118126Abstract: A chemical solvent is utilized to preferentially remove CO2 from a H2S-rich acid gas stream, the acid gas stream being absorbed by the chemical solvent from a sour syngas stream. A chemical solvent such as alkanolamine is used in a unique process configuration to separate CO2 from the acid gas stream. The resulting acid gas is significantly higher in H2S concentration with a substantial quantity of CO2 being removed. The resulting CO2-rich gas is recovered at minimal pressure loss, and can be remixed with the resulting sweet syngas stream as a feed for a gas combustion turbine for increased power generation.Type: ApplicationFiled: December 19, 2002Publication date: June 24, 2004Inventors: James O.Y. Ong, Daniel A. Woodall
-
Publication number: 20040065199Abstract: The natural gas is successively contacted in column CA with a relatively methanol-rich solvent flowing in through line 4, then with a relatively poor solvent flowing in through line 9. The acid gas-containing solvent recovered through line 3 at the bottom of column CA is expanded through valves V1 and V2 to release acid gases through line 6. A fraction of the expanded solvent is distilled in column CR. The regenerated solvent obtained at the bottom of column CR is sent to the top of column CA through line 9. A second fraction of the expanded solvent is mixed with a solvent drawn off from column CR at an intermediate point between the bottom and the top of this column. This mixture of solvents is sent through line 4 into column CA.Type: ApplicationFiled: October 6, 2003Publication date: April 8, 2004Inventors: Alexandre Rojey, Fabrice Lecomte, Eric Lemaire
-
Patent number: 6666908Abstract: Within the scope of a process using two absorption sections for treating a natural gas containing CO2 and/or H2S, as well as mercaptans, COS and/or CS2, the present invention aims to wash the gaseous hydrocarbons desorbed upon expansion of the solvent from the first absorption section with the solvent from the second absorption section.Type: GrantFiled: January 29, 2002Date of Patent: December 23, 2003Assignee: Institut Francais du PetroleInventors: Renaud Cadours, Fabrice Lecomte, Pascal Mougin
-
Patent number: 6645272Abstract: In a process for treating a gas containing acid gases, the gas is contacted with a methanol-containing aqueous phase and is then contacted in an absorption column with a mixture of solvents including mehtanol, water and a solvent heavier than methanol. Then, the mixture of solvents is at least partly regenerated through pressure reduction and/or heating. The treated gas is cooled by producing at least a methanol-containing aqueous phase that is at least partly recycled. The mixture of solvents flowing out at the bottom of the absorption column is cooled, then re-introduced at a higher level of the absorption column so as to control the temperature in the absorption column.Type: GrantFiled: September 24, 2001Date of Patent: November 11, 2003Assignee: Institute Francais du PetroleInventors: Eric Lemaire, Jean-Charles Viltard
-
Patent number: 6607585Abstract: An improved method and structure for purification of an acid gas stream by using raw fuel gas as a stripper to remove the BTEX and VOCs from the liquid amine stream. The improved method is particularly useful for purification of acid gas streams with BTEX contaminant levels in excess of environmentally acceptable levels for standard processing. Raw fuel gas is utilized at moderate temperatures and pressures, the uptake of BTEX and VOCs reduces the level of these compounds in the waste amine stream to environmentally acceptable levels, and the remaining contaminants may then be dealt with by ordinary means. Levels of H2S and CO2. in the liquid amine stream are also reduced.Type: GrantFiled: December 20, 2000Date of Patent: August 19, 2003Inventor: David Morrow
-
Publication number: 20020059865Abstract: Process for treating a gas containing acid gases, wherein:Type: ApplicationFiled: September 24, 2001Publication date: May 23, 2002Inventors: Eric Lemaire, Jean-Charles Viltard
-
Patent number: 6368385Abstract: A process and apparatus for the purification of a gas, in particular natural gas, in order to eliminate mercaptans without the use of gas adsorption or cryogenic expansion processes. Natural gas, dried and cooled, is supplied to an absorption column under pressure, producing a head product of a purified gas, and a base product supplied to a fractionating column which separates the most volatile compounds, free from mercaptans, from a gasoline fraction of the natural gas. The mercaptans are eliminated at the head of at least one distillation column, producing a base end product consisting of a mixture of C5 hydrocarbons, heavier than and free from volatile mercaptans, partially mixed with the most volatile recompressed compounds of the natural gas. This mixture is cooled and sent by reflux to the absorption column.Type: GrantFiled: July 26, 2000Date of Patent: April 9, 2002Assignee: TECHNIPInventor: Henri Paradowski
-
Patent number: 6342091Abstract: A process for the removal of carbon dioxide, sulphur compounds, water and aromatic and higher aliphatic hydrocarbons from industrial gases. The sour gas components, water and hydrocarbons are removed from the gas to be treated by absorption at elevated operating pressure. At least one morpholine derivative is used as the absorbent. The absorbent laden with absorbed components is regenerated with the aid of a stripping gas. The stripping gas is generated by partial evaporation of the laden absorbent.Type: GrantFiled: January 21, 2000Date of Patent: January 29, 2002Assignee: Krupp Uhde GmbHInventors: Johannes Menzel, Oliver Tondorf
-
Patent number: 6334886Abstract: A process is provided for removing CO2 and/or H2S from a gas mixture containing as impurities CO2 and/or H2S and at least one other impurity selected from the group consisting of a cyanide and ammonia. The process includes contacting at least a portion of the reflux stream from the overhead vapor from a stripping column of an acid gas removal solvent (i.e., alkanolamine) treatment plant with an anion exchange resin to remove corrosive impurities. The ion-exchanged reflux stream is then recycled to the top of the stripping column or into the bulk circulating acid gas removal solvent (i.e., alkanolamine) passing from the bottom of the stripping column.Type: GrantFiled: May 12, 2000Date of Patent: January 1, 2002Assignee: Air Products and Chemicals, Inc.Inventors: David Richard Barnes, Jr., Arthur Daniel Bixler
-
Patent number: 6162282Abstract: A method for determining the efficiency of a carbon filter used to absorb hydrocarbons from organic solvents. A sample of the solution, used to remove CO.sub.2 and H.sub.2 S from natural hydrocarbon gases, is taken after it has passed through the carbon filter. A solution of an internal standard and carbon disulfide is added to the sample to concentrate the hydrocarbons into the solution. A second sample taken from the solution containing the concentrated hydrocarbons and is passed through a gas chromatograph which has a fast temperature ramp to measure the peak areas of the hydrocarbons and the internal standard. The concentration of the measured hydrocarbons are determined by comparing the peak area counts against that of the internal standard.Type: GrantFiled: May 10, 1999Date of Patent: December 19, 2000Assignee: Mobil Oil CorporationInventors: Clifford C. Walters, Constance L. Hellyer
-
Patent number: 6139605Abstract: A double-loop process for the removal of specified gas or gases from a process gas by absorption with a liquid absorbent for said specified gas or gases wherein the process gas is contacted counter-currently in a first absorption stage with semi-lean absorbent liquid and then in a second absorption stage with lean absorbent liquid to give a sweet process gas and the absorbed gases are stripped from the laden absorbent liquid in a first stage giving a semi-lean absorbent liquid. Part of the semi-lean absorbent is recycled to the first absorption stage while the remainder is subjected to further stripping by counter-current contact with an auxiliary gas that has a concentration of the specified gas or gases that is lower than the concentration of the specified gas or gases in the process gas to give the lean absorbent liquid which is recycled to the second absorption stage.Type: GrantFiled: August 10, 1999Date of Patent: October 31, 2000Assignee: Imperial Chemical Industries PLCInventors: Peter John Herbert Carnell, Hiren Krishnakant Shethna, Gavin Paul Towler, Edwin Stephen Willis
-
Patent number: 6102987Abstract: A process for the removal of CO.sub.2 and sulfur compounds from natural gas and raw synthesis gas wherein N-formylmorpholine and N-acetylmorpholine mixtures are used as the desorbent at temperatures between -20.degree. C. and +40.degree. C. at pressures of 10 to 150 bar in a scrubbing operation. The acid gases are removed from the absorbent by flashing and the regenerated absorbent is recycled to the absorbent.Type: GrantFiled: September 29, 1998Date of Patent: August 15, 2000Assignee: Krupp Uhde GmbHInventors: Manfred Gross, Barbel Kolbe, Johannes Menzel, Werner Pohl
-
Patent number: 6001153Abstract: A method of treating a fluid containing at least methane and at least one acid gas and producing the acid gas or gases in liquid form. The method includes a step of regenerating the solvent, operated at a pressure whose value is at least equal to the bubble pressure of the mixture of acid gases produced in liquid form, a step in which the gaseous fraction from the regeneration step is rectified in a contact zone by separating at least some of the solvent from the gaseous fraction, a step in which the gaseous fraction from the modification step is cooled to a given temperature to cause at least some of the gaseous faction to condense forming at least one liquid fraction enriched with liquid acid gases and a step during which the liquid fraction of gases is separated from the remaining gaseous fraction.Type: GrantFiled: March 13, 1998Date of Patent: December 14, 1999Assignee: Institut Francais du PetroleInventors: Etienne Lebas, Alexandre Rojey
-
Patent number: 5958238Abstract: Method for anaerobic removal of a sulphur compound from waste water containing such compound, comprising the steps of: 1) feeding the waste water to an anaerobic digestion system; 2) converting the sulphur compound in the digestion system to a sulphide; 3) circulating an effluent containing the sulphide from the digestion system in a by-pass channel, the channel comprising a stripper system for stripping the sulphide from the effluent; 4) removing the sulphide from the effluent by contacting with a transporting gas in the stripper system; and 5) converting the sulphide to sulphur; wherein 6) the sulphide is absorbed from the transporting gas in an absorber system by an absorbing liquid, which absorbing liquid is passed in a closed loop through the absorber system and a regenerator system, and comprises a regenerable redox liquor, which redox liquor has a pH-value in the range of 4 to 7, preferably about 6.5.Type: GrantFiled: January 23, 1997Date of Patent: September 28, 1999Assignee: Nederlandse Organisatie Voor Toegepast Natuurwetenschappelijk Onderzoek TNOInventor: Josephus Sychbertus Adrianus Langerwerf
-
Patent number: 5928413Abstract: This invention provides a flue gas treating system and process which include a counterflow absorption tower and which can reduce the ammonia concentration in the treated flue gas to a low level.Type: GrantFiled: September 11, 1997Date of Patent: July 27, 1999Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Eiji Ochi, Kiyoshi Okazoe, Toru Takashina
-
Patent number: 5735936Abstract: The process comprises a cold absorption step 2 for removing acid gas from natural gas using a solvent phase at a pressure P.sub.2 which delivers a purified gas 5; a step for depressurizing and separating resultant acidic solvent phase containing hydrocarbons (lines 4, 11), at a pressure P.sub.12 which is lower than pressure P.sub.2 in a column-heat exchanger 12 which delivers a purified gaseous effluent 13 overhead and a further solvent phase at the bottom (line 17) which is enriched in hydrogen sulphide; and a solvent phase regeneration step carried out in a distillation column 18 at a pressure P.sub.18 and no higher than pressure P.sub.12. A gas 29 containing essentially hydrogen sulphide which is depleted in hydrocarbons is recovered from column 18 and is a suitable feed for a Claus plant for eliminating H.sub.2 S. The regenerated hot solvent phase 20 indirectly exchanges heat with the cold acidic solvent phase from absorber 2 or separator 6. It is then recycled to the absorbent after cooling.Type: GrantFiled: April 18, 1996Date of Patent: April 7, 1998Assignee: Institut Francais du PetroleInventors: Ari Minkkinen, Joseph Larue, Pierre Capron
-
Patent number: 5730784Abstract: Hydrogen Sulfide is substantially completely removed from a gas stream in a two-stage operation. Hydrogen Sulfide is first partially oxidized to sulfur dioxide and the sulfur dioxide reacted with part of the remaining hydrogen sulfide while the hydrogen sulfide not so reacted is subsequently oxidized, thereby removing all of the hydrogen sulfide from the gas stream.Type: GrantFiled: June 5, 1995Date of Patent: March 24, 1998Assignees: The University of Toronto Innovations Foundation, Apollo Environmental Systems Corp.Inventors: James W. Smith, David Todd R. Ellenor, John N. Harbinson
-
Patent number: 5693224Abstract: Sweetening of hydrogen-sulfide polluted liquids such as water and those whose viscosity is not substantially greater, is accomplished in upright tanks of constant cross-section, which are substantially conventional except for man-way provisions which permit clean-out and replacement of contents. Each tank, which has a liquid inlet provision near its bottom, is divided by its contents into three sections: a lowermost turbulence-eliminating section, an intermediate reacting section, and an uppermost tranquil purified storage section. Increase in capacity to fill a constant demand is attained by simply increasing the depth of the reacting section, to the lessening of the purified reserve.Type: GrantFiled: August 12, 1996Date of Patent: December 2, 1997Assignee: Gas Sweetener Associates, Inc.Inventor: Richard B. Fox
-
Patent number: 5474682Abstract: The invention provides a method for removing sulphur compounds from water by anaerobic reduction of the sulphur compounds to sulphide, followed by a partial oxidation of the sulphide to elementary sulphur. The anaerobic reduction is carried out at elevated temperature, either continuously at a temperature of 45.degree.-70.degree. C., or periodically at a temperature of 55.degree.-100.degree. C. If the reduction is carried out periodically, a single rise in temperature for a few hours to several days over a period of 3-6 months can suffice. The method is particularly applicable to the removal of sulphate, sulphite and thiosulphate.Type: GrantFiled: December 6, 1993Date of Patent: December 12, 1995Assignee: Paques B.V.Inventor: Cees J. N. Buisman
-
Patent number: 5240476Abstract: A process for recovery of hydrogen sulfide-free fuel, while maintaining desirable carbon dioxide for combustion in a gas turbine to recover power in an integrated gasification combined cycle power plant and obtaining a rich hydrogen sulfide Claus plant feed gas is described.Type: GrantFiled: September 7, 1990Date of Patent: August 31, 1993Assignee: Air Products and Chemicals, Inc.Inventor: William P. Hegarty