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| Number | Title | Issue Date |
| 8057643 | Eco-friendly process for recovery of pyridine and/or its derivatives A process recovers of pyridine and/or its derivatives from their aqueous mass and/or manufacturing reaction mass by liquid-liquid extraction employing an alkyl acetate. The process further involves effective recovering and recycling of solvents from the aqueous phas... | 11/15/2011 |
| 7326323 | High capacity purification of thermally unstable compounds Separations processes and apparati capable of purifying thermally sensitive materials at high capacity. An apparatus having a rectification section and a stripping section with the stripping section having a stripping tray with 5 to 50% open area, a pressure drop fr... | 02/05/2008 |
| 7241365 | Material for a facility for the production of anhydrous formic acid The invention relates to an apparatus and a process for the preparation of anhydrous or substantially anhydrous formic acid. This apparatus is constructed partly or entirely of substantially zirconium-free materials. The extractant employed is a liquid of the genera... | 07/10/2007 |
| 7128813 | Process for manufacturing high purity methacrylic acid A process for the high yield production of high purity glacial methacrylic acid (“HPMAA”) with minimization of decomposition of hydroxy isobutyric acid (HIBA). The HPMAA is substantially pure, specifically 99% pure or greater with a water content of 0.05% or les... | 10/31/2006 |
| 6712942 | Working up a mixture comprising alkene and oxygen A mixture (M1) comprising an alkene and oxygen is worked up by a process in which (i) oxygen is removed from the mixture (M1) by a nondistillative method to give a mixture (M2) and (ii) the alkene is separated off from the mixture (M2) by distillation. ... | 03/30/2004 |
| 6695952 | Method for the separation of and purification of an aqueous mixture consisting of the main components acetic acid and formic acid A method for the separation and purification of an aqueous mixture of main components, namely acetic acid and formic acid and non-volatiles by extraction, uses a solvent in a circulatory system. A raffinate stream is mixed with the larger proportion of wa... | 02/24/2004 |
| 6623604 | Method of recovering free fatty acids having low ester content and high acid value Methods of recovering free fatty acids having a low ester content from alkanol-containing solutions and oil mixtures containing tocopherols are disclosed which involve atmospheric or vacuum stripping at low temperatures. The recovered fatty acids have a h... | 09/23/2003 |
| 6514387 | Rectifying column for extractive distillation of close-boiling or azeotropic boiling mixtures The invention relates to a rectifying column for extractive distillation, comprising a column main section (204) and a raffinate section (205) above said main section, an evaporator (208) situated on the lower end of the column, an inlet (214) disposed be... | 02/04/2003 |
| 6488818 | Removal of impurities from 3-(2'-acetoxyethyl)-dihydro-2(3H)furanone A process for removing impurities from 3-(2'-acetoxyethyl)dihydro-2(3H)furanone (I), where the 3-(2'-acetoxyethyl)dihydro-2(3H)furanone containing the undesirable impurities is initially prepared in a manner known per se by acetylation of 3-(2'-hydro... | 12/03/2002 |
| 6294055 | Process for the separation of hydrogen fluoride from its mixtures with a hydrofluoroalkane containing from 3 to 6 carbon atoms Process for the separation of hydrogen fluoride from its mixtures with a hydrofluoroalkane containing from 3 to 6 carbon atoms, by extraction using an organic solvent.... | 09/25/2001 |
| 6210583 | Spent caustic pretreatment and enhanced oxidation process A process for pre-treating a spent caustic stream prior to oxidation which includes countercurrent multi-stage elevated temperature solvent extraction of dissolved organic material from the spent caustic using a solvent to yield a spent caustic raffinate ... | 04/03/2001 |
| 6193837 | Preparation of brightness stabilization agent for lignin containing pulp from biomass pyrolysis oils A process for producing a brightness stabilization mixture of water-soluble organic compounds from biomass pyrolysis oils comprising: a) size-reducing biomass material and pyrolyzing the size-reduced biomass material in a fluidized bed reactor; b) separating a... | 02/27/2001 |
| 6143856 | Process for the production of phenolic-rich pyrolysis oils for use in making phenol-formaldehyde resole resins A phenolic-rich pyrolysis oil is produced by pyrolysing lignocellulosic material at a temperature of no more than about 550° C under an absolute pressure of no more than about 50 kPa to produce pyrolysis vapors, and condensing the pyrolysis vapors to obt... | 11/07/2000 |
| 6096673 | Catalyst recovery in the production of 2,5-dihydrofuran by isomerization of vinyl oxirane An improved process is provided for the recovery of catalyst components from oligomeric impurities which are formed during the industrial preparation of 2,5-dihydrofuran by the catalytic isomerization of vinyl oxirane followed by an essential separation o... | 08/01/2000 |
| 6015477 | Point-of-use ammonia purification for electronic component manufacture Highly purified ammonia for use in processes for the production of high-precision electronic components is prepared on-site by drawing ammonia vapor from a liquid ammonia reservoir, passing the vapor through a filter capable of filtering out particles of ... | 01/18/2000 |
| 5885422 | Spent caustic (pre)treatment process A process for pretreating a spent caustic stream prior to oxidation includes countercurrent multi-stage elevated temperature solvent extraction of dissolved organic material from the spent caustic using a solvent to yield a spent caustic raffinate contain... | 03/23/1999 |
| 5811597 | Method for the manufacture of methyl tertiary butyl ether from tertiary butyl alcohol and methanol Methyl tertiary butyl ether is prepared from contaminated TBA by reactively distilling the contaminated TBA in a reactive distillation column to provide a lower boiling isobutylene fraction and a higher boiling aqueous TBA fraction, by distilling the high... | 09/22/1998 |
| 5811598 | Process for the recovery of phenol from an aqueous stream containing NA.sub. SO4 Phenol dissolved in an aqueous sulphatic stream discharged from a reactor in which cumene hydroperoxide is oxidized to phenol and acetone is recovered by extracting phenol present in said aqueous sulphatic stream containing phenol, Na2 SO4... | 09/22/1998 |
| 5763695 | Separation of 3-methyl-1-butanol from 1-pentanol by extractive distillation 3-Methyl-1-butanol cannot be separated from 1-pentanol by distillation or rectification because of the closeness of their boiling points. 3-Methyl-1-butanol is readily separated from 1-pentanol by extractive distillation. Effective agents are butyl benzoa... | 06/09/1998 |
| 5763694 | Separating 3-methyl-1-butanol from 1-pentanol by azeotropic distillation 3-Methyl-1-butanol cannot be separated from 1-pentanol by distillation or rectification because of the closeness of their boiling points. 3-Methyl-1-butanol is readily separated from 1-pentanol by azeotropic distillation. Effective agents are methylcycloh... | 06/09/1998 |
| 5744010 | Process for the preparation of the non-toxic salts of 6-methyl-3,4-dihydro-1,2,3-oxathiazin-4-one 2,2-dioxide and arrangement for carrying out this process The invention relates to a process for the preparation of acesulfam salts by reaction of salts of amidosulfonic acid with diketene to give a salt of acetoacetamidosulfonic acid (I), ring closure by the action of at least about an equivalent amount of SO | 04/28/1998 |
| 5565068 | Energy conservation during plural stage distillation In the multistage distillation of a methyl tertiary butyl ether reaction product comprising methyl tertiary butyl ether, tertiary butyl alcohol, methanol, isobutylene and water, the methyl tertiary butyl ether reaction product is separated in a primary me... | 10/15/1996 |
| 5447607 | Ether recovery Process equipment is provided for separating ether, alcohol and hydrocarbon components from various etherifications of C4 or C5 isoolefins with an alcohol such as methanol or ethanol, and wherein identical process vessels are utilize... | 09/05/1995 |
| 5409579 | Method for recovering acetic acid from aqueous streams Disclosed is a method and apparatus for recovering acetic acid from an acetic acid/water waste stream which includes a dehydration column into which the stream is fed and a liquid-liquid extraction system for recovering acetic acid from the condensate of ... | 04/25/1995 |
| 5348624 | Process for separating ethyl tert-butyl ether and ethanol For separating ETBE and ethanol the following principal stages are employed: (1) Extraction of ethanol by water, the raffinate being ETBE saturated in water and the extract an ethanol/water mixture containing a small proportion of ETBE; (2) Concentration ... | 09/20/1994 |
| 5215630 | Method of purifying eicosapentaenoic acid or the ester derivative thereof by fractional distillation The present invention provides a continuous method of purifying eicosapentaenoic acid and esters of eicosapentanoic acid, comprising (a) fractionally distilling a starting mixture containing eicosapentaenoic acid or esters of eicosapentaenoic acid using a... | 06/01/1993 |
| 5122236 | Method for removal of dimethyl ether and methanol from C4 hydrocarbon streams A process for removing dimethyl ether (DME) and methanol impurities from C4 hydrocarbon stream without substantial loss of C4 hydrocarbons by fractionating a C4 hydrocarbon stream containing DME and methanol at low levels,... | 06/16/1992 |
| 5076896 | Process for the separation of propylene glycol from fatty alcohols A process for the separation of propylene glycol from a mixture of low-boiling fatty alcohols and propylene glycol which comprises extracting the mixture with water to produce a water-propylene glycol mixture and fractionating the water-propylene glycol m... | 12/31/1991 |
| 5057192 | Acetone removal from acetic anhydride production process Disclosed is an improved process for the removal of acetone from a production system wherein acetic anhydride is produced by contacting a mixture containing methyl iodide and methyl acetate and/or dimethyl ether with carbon monoxide in the presence of a c... | 10/15/1991 |
| 4997547 | Method for the production of an aromate concentrate suitable for use as blending component for fuel In the method for the production of an aromate concentrate suitable for use as blending component for gasifier fuel, feed hydrocarbon mixtures having boiling ranges substantially between 40° and 170° C., are subjected, without any previous separation in... | 03/05/1991 |
| 4902385 | Process for the purifying distillation of crude sec-butyl alcohol Practically anhydrous crude sec-butyl alcohol produced by catalytic direct hydration of n-butenes is freed by means of water from the azeotropically boiling and low-boiling by-products by continuous azeotropic distillation in a separation column, the prep... | 02/20/1990 |
| 4886581 | Removal of hydrogen fluoride from 2,2,3,3-tetra-fluorooxetane By extracting hydrogen fluoride from 2,2,3,3-tetrafluorooxetane with a halogenated hydrocarbon, a mixture of 2,2,3,2-tetrafluorooxetane and the halogenated hydrocarbon containing a small amount of hydrogen fluoride is obtained. The mixture may be distille... | 12/12/1989 |
| 4836896 | Separation of m-diisopropylbenzene from p-diisoproylbenzene by azeotropic distillation with acetophenone Meta- and para-diisopropylbenzenes cannot be easily separated from each other by distillation because of the closeness of their vapor pressures. m-Diisopropylbenzene can be readily removed from p-diispropylbenzene by azeotropic distillation using acetophe... | 06/06/1989 |
| 4769112 | Method for removing water from ethanol A method and apparatus for removing water from a liquid mixture of water and ethanol contacts it with liquid carbon dioxide so that the ethanol is preferentially transferred into solution, dries the solution using an adsorbent, and then recovers dry ethan... | 09/06/1988 |
| 4764256 | Removal of polychlorinated biphenyls by solvent extraction A method is provided for continuous removal of polychlorinated biphenyl compounds (PCB) from oil contaminated therewith, comprising the steps of continuously extracting PCB compounds from contaminated oil with a PCB-selective solvent in the stripping sect... | 08/16/1988 |
| 4740273 | Process for the purification of diethoxymethane from a mixture with ethanol and water A process for purifying diethoxymethane from a mixture containing ethanol and, optionally, water. The process involves the addition of an amount of water, DEM, or an appropriate mixture of any two or three of water, DEM and ethanol that is effective in mo... | 04/26/1988 |
| 4615771 | Method of separating bis-(2-aminoethyl)ether from N-(2-methoxyethyl)morpholine by azeotropic distillation and extraction A method for the separation of bis-(2-aminoethyl)ether from N-(2-methoxyethyl)morpholine via azeotropic distillation using an entrainer such as monoethanolamine is described. The N-(2-methoxyethyl)morpholine is selectively removed by the monoethanola... | 10/07/1986 |
| 4513153 | Integrated process for producing tert.butyl alkyl ethers and butene-1 Tert.butyl alkyl ethers are produced from a C4 hydrocarbon feedstock containing isobutene, and the butene-1 is recovered at high purity by extractive distillation of the isobutene-free C4 hydrocarbon stream in the presence of a solve... | 04/23/1985 |
| 4504364 | Phenol purification In the production of high purity phenol, a water-phenol mixture recovered from the top of a distillation column is contacted with a water immiscible solvent to extract methyl benzofuran and other by-products and impurities in phenol production therefrom, ... | 03/12/1985 |
| 4490563 | Ether recovery MTBE is recovered from an ether containing effluent by fractionation. When driers are not used on the hydrocarbon feed to MTBE manufacture, a separate water-methanol phase occurs in the fractionation overhead which is separately processed in a methanol fr... | 12/25/1984 |
