Aldehyde Or Ketone Patents (Class 203/62)
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Patent number: 5262015Abstract: Octene-1 is difficult to separate from several of its isomers by conventional distillation or rectification because of the closeness of their boiling points. Octene-1 can be readily separated from its close boiling isomers by azeotropic or extractive distillation. Effective agents are: for azeotropic distillation, t-amyl methyl ether; for extractive distillation, isophorone.Type: GrantFiled: February 26, 1993Date of Patent: November 16, 1993Assignee: Lloyd BergInventors: Lloyd Berg, Randi W. Wytcherley
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Patent number: 5262016Abstract: A stream of raw phenol, coming from the acidic cracking of cumene hydroperoxide, is purified by a process of extractive distillation carried out in the presence of acetophenone.Type: GrantFiled: May 24, 1991Date of Patent: November 16, 1993Assignee: Enimont Anic S.r.l.Inventors: Loreno Lorenzoni, Salvatore Simula, Giuseppe Messina, Vittorio Bruzzi
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Patent number: 5258102Abstract: Heptane cannot be separated from vinyl acetate by conventional distillation or rectification because of the minimum boiling azeotrope. Heptane can be readily separated from vinyl acetate by using azeotropic distillation. Typical examples of effective agents are methyl acetate, ethanol, ethyl formate or t-amyl methyl ether.Type: GrantFiled: March 29, 1993Date of Patent: November 2, 1993Assignee: Lloyd BergInventor: Lloyd Berg
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Patent number: 5256259Abstract: Hexane cannot be separated from vinyl acetate by conventional distillation or rectification because of the minimum boiling azeotrope. Hexane can be readily separated from vinyl acetate by using azeotropic distillation. Typical examples of effective agents are acetone, acetonitrile or methyl t-butyl ether.Type: GrantFiled: March 29, 1993Date of Patent: October 26, 1993Assignee: Lloyd BergInventors: Lloyd Berg, Randi W. Wytcherley
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Patent number: 5232558Abstract: 4-Methyl-2-pentanone cannot be easily separated from formic acid by distillation because of the closeness of their boiling points. 4-Methyl-2-pentanone can be readily removed from formic acid by extractive distillation. Typical effective agents are dimethylsulfoxide (DMSO) and 2-undecanone; DMSO and octanoic acid; DMSO and hexyl acetate.Type: GrantFiled: October 8, 1992Date of Patent: August 3, 1993Assignee: Lloyd BergInventors: Lloyd Berg, Marc W. Paffhausen
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Patent number: 5230778Abstract: A method for the separation of Isoflurane from its admixture with other compounds produced in the chlorination of 2-difluoromethoxy-1,1,1-trifluoroethane including subjecting the mixture to distillation, distilling off the Isoflurane and effecting said distillation as an extractive distillation employing an extractive solvent which retards the vapor pressure of Isoflurane.Type: GrantFiled: May 1, 1992Date of Patent: July 27, 1993Assignees: Gavlin Associates, Halocarbon Product CorporationInventors: Gilbert Gavlin, Boris Goltsin
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Patent number: 5228957Abstract: The separation by conventional distillation or rectification of methyl t-butyl ether from close boiling hydrocarbons is difficult because of the closeness of their vapor pressures. Methyl t-butyl ether can be readily separated from these by extractive distillation. Examples of effective agents are: from 1-pentene, dimethylsulfoxide; from cyclopentane, sulfolane and from n-pentane - cyclopentane mixtures, diethyl malonate.Type: GrantFiled: January 6, 1993Date of Patent: July 20, 1993Assignee: Lloyd BergInventor: Lloyd Berg
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Patent number: 5228956Abstract: 3-Pentanone cannot be completely removed from 3-pentanone and formic acid mixtures by distillation because of the presence of the maximum azeotrope. 3-Pentanone can be readily removed from 3-pentanone-formic acid mixtures by extractive distillation in which the extractive agent is cyclopentanone, either alone or admixed with certain high boiling organic compounds. Examples of effective agents are cyclopentanone; cyclopentanone and 2-methoxyethyl ether; cyclopentanone, adiponitrile and octanoic acid.Type: GrantFiled: October 2, 1992Date of Patent: July 20, 1993Assignee: Lloyd BergInventors: Lloyd Berg, Rudolph J. Szabados
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Patent number: 5225050Abstract: Hexane cannot be removed from hexane - vinyl acetate mixtures by distillation because of the minimum boiling azeotrope. Hexane can be readily removed from vinyl acetate by extractive distillation. Typical effective agents are phenol, 1-nitropropane and benzyl alcohol.Type: GrantFiled: December 15, 1992Date of Patent: July 6, 1993Assignee: Lloyd BergInventors: Lloyd Berg, Randi W. Wytcherley
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Patent number: 5207876Abstract: Tetrachloroethylene cannot be completely separated from methanol, ethanol, 1-propanol, isopropanol, 1-butanol, 2-butanol, isobutanol, 1-pentanol, 2-pentanol, 3-methyl-1-butanol or t-amyl alcohol by conventional distillation or rectification because of the minimum boiling azeotropes. Tetrachloroethylene can be readily separated from these alcohols by extractive distillation. A typical effective agent is dimethylsulfoxide.Type: GrantFiled: January 17, 1992Date of Patent: May 4, 1993Assignee: Lloyd BergInventors: Lloyd Berg, Zuyin Yang
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Patent number: 5202463Abstract: An improved process for preparing and purifying glycol ether esters is disclosed. An azeotroping agent is included at a sufficiently low level to allow removal of the water of reaction, but also permit removal of by-products from esterification in the low-boiling component.Type: GrantFiled: September 10, 1991Date of Patent: April 13, 1993Assignee: ARCO Chemical Technology, L.P.Inventor: Jude T. Ruszkay
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Patent number: 5196094Abstract: 1,1,1-Trichloroethane cannot be completely separated from methanol, ethanol, n-propanol, isopropanol, 2-butanol or t-butanol by conventional distillation or rectification because of the minimum boiling azeotropes. 1,1,1-Trichloroethane can be readily separated from these alcohols by extractive distillation. A typical effective agent is dimethylsulfoxide.Type: GrantFiled: November 8, 1991Date of Patent: March 23, 1993Assignee: Lloyd BergInventors: Lloyd Berg, Zuyin Yang
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Patent number: 5194123Abstract: 4-Methyl-2-pentanone cannot be easily separated from acetic acid by distillation because of the closeness of their boiling points. 4-Methyl-2-pentanone can be readily removed from acetic acid by extractive distillation. Typical effective agents are dimethlsulfoxide (DMSO); DMSO and adipic acid; DMSO, adipic acid and adiponitrile.Type: GrantFiled: July 6, 1992Date of Patent: March 16, 1993Assignee: Lloyd BergInventors: Lloyd Berg, Marc W. Paffhausen
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Patent number: 5194122Abstract: A method for recovering volatile, organic compounds from manure, by:i) acidifying and concentrating the manure;ii) condensing the formed vapor; andiii) separating the volatile, organic compounds from the condensate.Preferably the volatile, organic compounds are removed from the condensate by liquid extraction, crystallization, distillation and/or ion exchange.Type: GrantFiled: April 20, 1990Date of Patent: March 16, 1993Assignee: MeMon B.V.Inventor: Erik D. J. Bleeker
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Patent number: 5190619Abstract: 3-Methyl-2-butanone cannot be separated from formic acid by distillation because of the presence of the maximum boiling azeotrope. 3-Methyl-2-butanone can be readily removed from formic acid by extractive distillation using dimethylsulfoxide (DMSO). Typical effective agents are: DMSO and heptanoic acid; DMSO, octanoic acid and butyl benzoate.Type: GrantFiled: March 30, 1992Date of Patent: March 2, 1993Assignee: Lloyd BergInventors: Lloyd Berg, George Bentu
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Patent number: 5173156Abstract: Formic acid cannot be completely removed from formic acid--water mixtures by distillation because of the presence of the maximum azeotrope. Formic acid can be readily removed from mixtures containing it and water by using extractive distillation in which the extractive distillation agent is cyclohexanone, isophorone or a mixture of these with certain organic compounds. Typical examples of effective agents are cyclohexanone; isophorone; cyclohexanone and neodecanoic acid; isophorone and diisobutyl ketone.Type: GrantFiled: December 9, 1991Date of Patent: December 22, 1992Assignee: Lloyd BergInventors: Lloyd Berg, Kraig M. Wendt, Rudolph J. Szabados
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Patent number: 5160585Abstract: Tetracholorethylene cannot be completely separated from n-butanol, isobutanol or 2-butanol by conventional distillation or rectification because of minimum boiling azeotropes. Tetrachloroethylene can be readily separated from n-butanol, isobutanol or 2-butanol by extractive distillatiion. Typical effective agents are: for n-butanol, dipropylene glycol methyl ether; for isobutanol, dimethylsulfoxide and isobutyl butyrate; for 2-butanol, ethylene glycol methyl ether and isobornyl acetate.Type: GrantFiled: July 23, 1991Date of Patent: November 3, 1992Assignee: Lloyd BergInventor: Lloyd Berg
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Patent number: 5160412Abstract: Acetic acid is difficult to separate from water by conventional distillation or rectification because of the close proximity of their boiling points. Acetic acid can be readily separated from water by using azeotropic distillation. Typical examples of effective agents are ethyl n-valerate and 4-methyl-2-pentanone.Type: GrantFiled: March 10, 1992Date of Patent: November 3, 1992Assignee: Lloyd BergInventor: Lloyd Berg
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Patent number: 5152876Abstract: Methylene chloride cannot be completely separated from methanol or ethanol by conventional distillation or rectification because of the mimimum boiling azeotrope. Methyelne chloride can be readily separated from methanol or ethanol by azeotropic or extractive distillation. Typical effective agents are: for methanol by azeotropic distillation, isopropanol or t-butanol; by extractive distillation, 1-nitropropane or n-butanol; for ethanol by extractive distillation, isobutanol or n-propyl acetate.Type: GrantFiled: March 27, 1991Date of Patent: October 6, 1992Assignee: Lloyd BergInventors: Lloyd Berg, Zuyin Yang
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Patent number: 5147512Abstract: The higher boiling ketone isomers are difficult to separate one from another by conventional distillation or rectification because of the close proximity of their boiling points. Ketone isomers can be readily separated from each other by extractive distillation. Typical examples of effective agents are: for 3-pentanone from 2-pentanone, dipropylene glycol; 3-hexanone from 2-hexanone, butoxypropanol; 3-heptanone from 2-heptanone, 50% ethylene glycol--50% butoxypropanol; 3-octanone from 2-octanone, ethylene glycol diacetate.Type: GrantFiled: June 28, 1991Date of Patent: September 15, 1992Assignee: Lloyd BergInventors: Lloyd Berg, Thomas A. Edison
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Patent number: 5143585Abstract: An organic solvent having a boiling point lower than that of water is removed from liquid containig water and the organic solvent contained in a tank by exhausting air in the tank, wherein an air pressure in the tank is kept about vapor pressure level of the liquid.Type: GrantFiled: September 15, 1989Date of Patent: September 1, 1992Assignee: Konica CorporationInventors: Kazuyoshi Ichikawa, Shinichi Suzuki, Sanae Oyama, Hideaki Kimura
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Patent number: 5139621Abstract: An azeotropic distillation method for separating diamondoids from a near-boiling solvent. The method is particularly useful for recovering diamondoids extracted from a produced natural gas stream via hydrocarbon solvent injection.Type: GrantFiled: June 11, 1990Date of Patent: August 18, 1992Assignee: Mobil Oil CorporationInventors: Richard A. Alexander, D. Duayne Whitehurst
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Patent number: 5137606Abstract: The present invention is directed to an improved reverse osmosis membrane that shows surprisingly improved solute rejection and permeation properties. The membrane includes a separating layer of a polyamideurethane formed in situ by reaction of a haloformyloxy-substituted acyl halide with a diamine-treated substrate.Type: GrantFiled: September 5, 1991Date of Patent: August 11, 1992Assignee: E. I. Du Pont de Nemours and CompanyInventor: Samuel D. Arthur
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Patent number: 5131985Abstract: Chloroform cannot be completely separated from methanol, ethanol or isopropanol by conventional distillation or rectification because of the minimum boiling azeotrope between chloroform and the alcohols. Chloroform can be readily separated from methanol, ethanol or isopropanol by extractive distillation. Typical effective agents are: for methanol, isopropanol or 4-methyl-2-pentanone; for ethanol, n-butanol or isobutyl acetate; for isopropanol, butyl acetate or ethylene glycol ethyl ether.Type: GrantFiled: June 3, 1991Date of Patent: July 21, 1992Assignee: Lloyd BergInventors: Lloyd Berg, Zuyin Yang
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Patent number: 5124005Abstract: Methylene chloride cannot be completely separated from ethyl vinyl ether by conventional distillation or rectification because of the minimum boiling azeotrope. Methylene chloride can be readily separated from ethyl vinyl ether by extractive distillation. Typical effective agents are ethylene glycol methyl ether acetate, 2-hexanone and 1-nitropropane.Type: GrantFiled: April 25, 1991Date of Patent: June 23, 1992Assignee: Lloyd BergInventors: Zuyin Yang, Lloyd Berg
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Patent number: 5118392Abstract: Trichloroethylene cannot be completely separated from n-butanol, isobutanol, 2-butanol or t-butanol by conventional distillation or rectification because of the minimum boiling azeotropes. Trichloroethylene can be readily separated from n-butanol, isobutanol, 2-butanol or t-butanol by extractive distillation. Typical effective agents are: for n-butanol, dimethylsulfoxide; for isobutanol, n-octanol; for 2-butanol, 2-methyl-1-pentanol and for t-butanol, n-butyl acetate.Type: GrantFiled: July 25, 1991Date of Patent: June 2, 1992Assignee: Lloyd BergInventor: Lloyd Berg
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Patent number: 5106460Abstract: 1,1,1-Trichloroethane cannot be completely separated from n-hexane by conventional distillation or rectification because of the minimum boiling azeotrope. 1,1,1-Trichloroethane can be readily separated from n-hexane by extractive distillation. Typical effective agents are: methyl isoamyl ketone, amyl acetate and isobutanol.Type: GrantFiled: September 9, 1991Date of Patent: April 21, 1992Assignee: Lloyd BergInventor: Lloyd Berg
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Patent number: 5106459Abstract: p-Cymene and p-menthane are difficult to separate one from another by conventional distillation or rectification because of the close proximity of their boiling points. p-Cymene and p-menthane can be readily separated one from another by using azeotropic or extractive distillation. Typical examples of effective agents, for azeotropic distillation: diethyelene glycol ethyl ether, 1-pentanol and isobutanol; for extractive distillation: butyl benzoate, undecyl alcohol and methyl benzoate.Type: GrantFiled: December 14, 1990Date of Patent: April 21, 1992Assignee: Lloyd BergInventor: Lloyd Berg
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Patent number: 5106458Abstract: Methyl formate is removed from impure propylene oxide by contacting the impure propylene oxide in a treating zone with a basic ion exchange resin for a period of time sufficient to convert the methyl formate to formic acid and methanol, and by withdrawing a substantially methyl formate-free treated propylene oxide product from the treating zone.Type: GrantFiled: July 26, 1991Date of Patent: April 21, 1992Assignee: Texaco Chemical CompanyInventors: Robert A. Meyer, Eileen T. Nguyen, William A. Smith
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Patent number: 5100514Abstract: Pyridine cannot be completely separated from water by conventional distillation or rectification because of the minimum boiling azeotrope. Pyridine can be readily separated from water by using azeotropic or extractive distillation. Typical examples of effective agents are: by azeotropic distillation, methyl isoamyl ketone and propylene glycol dimethyl ether; by extractive distillation, isophorone and sulfolane.Type: GrantFiled: March 1, 1991Date of Patent: March 31, 1992Assignee: Lloyd BergInventors: Lloyd Berg, Zuyin Yang
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Patent number: 5094723Abstract: m-Xylene is difficult to separate from p-xylene or o-xylene by conventional distillation or rectification because of the close proximity of their boiling points. m-Xylene can be readily separated from p-xylene or o-xylene by using extractive distillation in which the agent is an alcohol. Typical examples of effective agents are: for m-xylene from o-xylene, 1-octanol and cyclododecanol; for p-xylene from m-xylene, diisobutyl carbinol and cyclododecanolphenethyl alcohol mixture.Type: GrantFiled: January 2, 1991Date of Patent: March 10, 1992Assignee: Lloyd BergInventor: Lloyd Berg
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Patent number: 5094724Abstract: Methylene chloride cannot be completely separated from methyl formate or ethyl formate by conventional distillation or rectification because of the minimum boiling azeotrope. Methylene chloride can be readily separated from methyl formate or ethyl formate by extractive distillation. Typical effective agents are: for methyl formate, n-butyl acetate and 3-hexanone; for ethyl formate, isobornyl acetate and 2-heptanone.Type: GrantFiled: April 19, 1991Date of Patent: March 10, 1992Assignee: Lloyd BergInventors: Lloyd Berg, Zuyin Yang
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Patent number: 5092965Abstract: 4-Methyl-2-pentanone cannot be easily separated from acetic acid by distillation because of the closeness of their boiling points. 4-Methyl-2-phentanone can be readily removed from acetic acid by extractive distillation. Typical effective agents are dimethylformamide (DMFA); DMFA and m-toluic acid; DMFA, p-toluic acid and isobutyl heptyl ketone.Type: GrantFiled: May 2, 1991Date of Patent: March 3, 1992Assignee: Lloyd BergInventors: Lloyd Berg, Marc W. Paffhausen
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Patent number: 5092966Abstract: Ethyl ester cannot be completely separated from methylene chloride by conventional distillation or rectification because of the maximum boiling azeotrope. Ethyl ether can be readily separated from methylene chloride by extractive distillation. Typical effective agents are t-butyl alcohol, n-propyl acetate or propoxypropanol.Type: GrantFiled: April 1, 1991Date of Patent: March 3, 1992Assignee: Lloyd BergInventors: Lloyd Berg, Zuyin Yang
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Patent number: 5085739Abstract: Isopropanol and n-propanol cannot be completely separated from water by conventional distillation or rectification because of the minimum boiling azeotrope. Isopropanol and n-propanol can be readily separated from water by using azeotropic or extractive distillation. Typical examples of effective agents are: for isopropanol by azeotropic distillation, vinyl n-butyl ether; by extractive distillation, polyethylene glycol; for n-propanol by azeotropic distillation, amyl formate; by extractive distillation, n-butyl acetate.Type: GrantFiled: January 30, 1991Date of Patent: February 4, 1992Assignee: Lloyd BergInventors: Lloyd Berg, Zuyin Yang
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Patent number: 5084142Abstract: t-Butyl alcohol cannot be completely separated from water by conventional distillation or rectification because of the minimum boiling azeotrope. t-Butyl alcohol can be readily separated from water by using azeotropic or extractive distillation. Typical examples of effective agents are: by azeotropic distillation, vinyl n-butyl ether and propylene glycol dimethyl ether; by extractive distillation, 1,3-butanediol and triethylene glycol.Type: GrantFiled: February 21, 1991Date of Patent: January 28, 1992Assignee: Lloyd BergInventors: Lloyd Berg, Zuyin Yang
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Patent number: 5069756Abstract: Cyclohexane cannot be readily separated from cyclohexene by conventional distillation or rectification because of the close proximity of their boiling points. Cyclohexane can be separated from cyclohexene by azeotropic or extractive distillation. Typical examples of effective agents are: for azeotropic; ethylene glycol methyl ether and n-butanol; for extractive; propylene glycol methyl ether and diacetone alcohol.Type: GrantFiled: November 26, 1990Date of Patent: December 3, 1991Assignee: Lloyd BergInventor: Lloyd Berg
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Patent number: 5051153Abstract: Methylal cannot be completely separated from methylene chloride by conventional distallation or rectification because of the maximum boiling azeotrope. Methylal can be readily separated from methylene chloride by extractive distillation. Typical effective agents are n-butyl acetate, diisobutyl ether and 4-methyl-2-pentanone.Type: GrantFiled: May 20, 1991Date of Patent: September 24, 1991Assignee: Lloyd BergInventor: Lloyd Berg
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Patent number: 4994151Abstract: 4-Methyl-2-pentanone cannot be easily separated from formic acid by distillation because of the closeness of their boiling points. 4-Methyl-2-pentanone can be readily removed from formic acid by extractive distillation using dimethylamides. Typical effective agents are dimethylformamide; dimethylacetamide and acetyl salicyclic acid; dimethylacetamide, heptanoic acid and methyl benzoate.Type: GrantFiled: July 14, 1989Date of Patent: February 19, 1991Assignee: Lloyd BergInventors: Lloyd Berg, George Bentu
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Patent number: 4980033Abstract: Triethylene glycol cannot be easily separated from glycerine or 1,2,4-butanetriol by atmospheric or reduced pressure distillation because of the closeness of their boiling points. Triethylene glycol can be readily separated from glycerine or 1,2,4-butanetriol by azeotropic distillation. Effective agents are p-xylene, alphapinene and diisobutyl ketone.Type: GrantFiled: September 4, 1990Date of Patent: December 25, 1990Assignee: Lloyd BergInventor: Lloyd Berg
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Patent number: 4975157Abstract: The lower lactate esters are difficult to separate one from another by conventional distillation or rectification because of the close proximity of their boiling points. Lactate esters can be readily separated from each other by extractive distillation. Typical examples of effective agents are: for methyl lactate from ethyl lactate, ethylene glycol; ethyl lactate from isopropyl lactate, diethylene glycol; isopropyl lactate from n-propyl lactate, isophorone; n-propyl lactate from butyl lactate, 2-hydroxyacetophenone.Type: GrantFiled: July 12, 1990Date of Patent: December 4, 1990Assignee: Lloyd BergInventor: Lloyd Berg
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Patent number: 4971661Abstract: An impure propylene oxide feedstock contaminated with from about 50 to about 1000 ppm of methanol and from about 0 to about 1 wt. % of acetone is charged to the lower half of an extractive distillation column containing at least about 25 theoretical plates and an extractive distillation agent consisting essentially of a blend of acetone and water (acetone/water blend) containing about 20 to about 30 wt. % of acetone and, correspondingly, about 80 to about 70 wt. % of water is charged to the tower at a point 4 to 7 theoretical stages above the impure propylene oxide feed point; the extractive distillation agent being introduced into the extractive distillation column in the ratio of said feedstock to said extractive distillation agent of from about 5:1 to about 20:1, whereby an overhead distillate fraction is obtained consisting essentially of propylene oxide contaminated with not more than about 60 ppm of methanol, not more than about 0.02 wt. % of acetone and not more than about 0.3 wt. % of water.Type: GrantFiled: October 20, 1989Date of Patent: November 20, 1990Assignee: Texaco Chemical CompanyInventors: Robert A. Meyer, Kenneth P. Keating, William A. Smith, Robert M. Steinberg
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Patent number: 4966658Abstract: Ethylene glycol cannot be easily separated from 1,2-butanediol or 1,3-butanediol by atmospheric or reduced pressure distillation because of the closeness of their boiling points. Ethylene glycol can be readily separated from the butanediols by azeotropic distillation. Typical effective agents are ethyl benzene, 3-heptanone or diisobutyl ketone.Type: GrantFiled: July 5, 1990Date of Patent: October 30, 1990Assignee: Lloyd BergInventor: Lloyd Berg
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Patent number: 4957595Abstract: 3-Methyl-2-butanone cannot be separated from formic acid by distillation because of the presence of the maximum boiling azotrope. 3-Methol-2-butanoe can be readily removed from formic acid by extractive distillation using sulfolane. Typical effective agents are: sulfolane and ethylene glycol diacetate; sulfolane, m-toluic acid and anisole.Type: GrantFiled: November 7, 1989Date of Patent: September 18, 1990Assignee: Lloyd BergInventors: Lloyd Berg, George Bentu
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Patent number: 4948471Abstract: 4-Methyl-2-pentanone cannot be easily separated from formic acid or acetic acid by distillation because of the closeness of their boiling points. 4-Methyl-2-pentanone can be readily removed from formic acid or acetic acid by extractive distillation. Typical effective agents are sulfolane; sulfolane and heptanoic acid; sulfolane, azelaic acid and ethylene glycol diacetate.Type: GrantFiled: August 1, 1989Date of Patent: August 14, 1990Assignee: Lloyd BergInventors: Lloyd Berg, George Bentu
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Patent number: 4948469Abstract: Dioxane cannot be completely removed from dioxane and formic acid mixtures by distillation because of the presence of the maximum azeotrope. Dioxane can be readily removed from dioxane - formic acid mixtures by extractive distillation in which the extractive agent is dimethylformamide, dimethylacetamide or these with certain high boiling organic compounds.Type: GrantFiled: December 5, 1988Date of Patent: August 14, 1990Assignee: Lloyd BergInventors: Lloyd Berg, Richard R. Rall
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Patent number: 4935102Abstract: A complex mixture of polyols cannot be easily separated by atmospheric or reduced pressure distillation because of the closeness of their boiling points. A mixture of polyols can be readily separated by azeotropic distillation. Typical effective agents are: p-xylene for propylene glycol from 2,3-butanediol and 1,2-butanediol; diisobutyl ketone for ethylene glycol from 1,2-butanediol and 1,3-butanediol; dipentene for glycerine from triethylene glycol and 1,2,4-butanetriol; propylene glycol isobutyl ether for 2,3-butanediol from propylene glycol.Type: GrantFiled: December 27, 1989Date of Patent: June 19, 1990Assignee: Lloyd BergInventor: Lloyd Berg
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Patent number: 4935100Abstract: Formic acid cannot be completely removed from formic acid and water mixtures by distillation because of the presence of the maximum azeotrope. Formic acid can be readily removed from formic acid - water mixtures by extractive distillation in which the extractive agent is a benzoic acid derivative mixed with certain higher boiling organic compounds. Examples of effective agents are: o-toluic acid and heptanoic acid; 2-benzoylbenzoic acid and methyl salicylate; p-hydroxybenzoic acid, pelargonic acid and 2-hydroxyacetophenone.Type: GrantFiled: May 30, 1989Date of Patent: June 19, 1990Assignee: Lloyd BergInventors: Lloyd Berg, Kraig M. Wendt, Rudolph J. Szabados
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Patent number: 4925533Abstract: Vinyl acetate cannot be easily removed from ethyl acetate by distillation because of the closeness of their boiling points. Vinyl acetate can be readily separated from ethyl acetate by means of extractive distillation. Typical effective agents are formic acid, formamide and formic acid-formamide mixture.Type: GrantFiled: March 6, 1989Date of Patent: May 15, 1990Assignee: Lloyd BergInventor: Lloyd Berg
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Patent number: 4909907Abstract: Formic acid cannot be easily removed from acetic acid by distillation because of the closeness of their vapor pressures. Formic acid can be readily removed from acetic acid by extractive distillation. Typical extractive distillation agents are acetyl salicylic acid and butyl benzoate; acetyl salicylic acid and ethylene carbonate.Type: GrantFiled: January 17, 1989Date of Patent: March 20, 1990Assignee: Hoechst Celanese Chemical Co.Inventor: Lloyd Berg