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| Number | Title | Issue Date |
| 8021520 | Method and device for preparing liquid The invention relates to a device and method for preparing liquid from solid materials such as medicinal materials. It includes liquid and materials for preparing the liquid at the beginning and the end of the process. The device uses a steam generator, an intermedi... | 09/20/2011 |
| 7416644 | Method and device for stripping ammonia from liquids The present invention provides a method and a system for stripping volatile compounds such as ammonia from liquids. Part of the ammonia is stripped from the liquid in a system having a shunt through which liquid such as e.g. fermented biomass can be diverted in the ... | 08/26/2008 |
| 7407532 | Process for separating NH, and optionally also COand HO, from a mixture containing NH, COand HO The invention relates to a process for separating NH3 from a mixture containing NH3, CO2 and H2O which comprises an NH3 rectification step carried out in a NH3 separation device to which one or more s... | 08/05/2008 |
| 7368617 | Selective hydrogenation of acetylenes and dienes in a hydrocarbon stream Acetylenes and dienes in a stream containing hydrogen, methane, C2-C6 olefins and paraffins, C2-C6 acetylenes and dienes, benzene, toluene, xylenes, and other C6+ components are hydrogenated in a downflow boilin... | 05/06/2008 |
| 7365217 | Oxidation process A process is disclosed for reacting an olefin, hydrogen, and oxygen in a reactor in the presence of an epoxidation catalyst comprising a transition metal zeolite and a noble metal to produce a product stream comprising an epoxide and an alkane. The alkane is separat... | 04/29/2008 |
| 7301048 | Process for isolating vinyl acetate A process for isolating vinyl acetate from the gas mixture formed in the reaction of ethylene with acetic acid and oxygen in the gas phase over catalysts comprising palladium or palladium compounds, with recirculation of the acetic-acid solution obtained in the circ... | 11/27/2007 |
| 6896772 | Method for separating ammonia from solutions containing caprolactam and ammonia A process for distillative removal of ammonia from solutions (I) which include a lactam and ammonia comprises effecting said removal in a distillation apparatus (a) at an absolute pressure of less than 10 bar. ... | 05/24/2005 |
| 6623546 | Method and installation for chemical purification of vapor in a dehydrator with mechanical vapor compression According to the invention, the vapor is taken from the condensation chamber of the dehydrator and, prior to being compressed and at a temperature substantially equal to 100° C., it is caused to pass in succession through a series of purifiers, and in ea... | 09/23/2003 |
| 6332949 | Method for upgrading used sulfuric acids A process for concentrating spent sulphuric acids particularly sulphuric acids which arise during the nitration of hydrocarbons with nitric acid in the presence of sulphuric acid, wherein single- or multi-stage concentration is effected under vacuum.... | 12/25/2001 |
| 6267848 | Method for generating vacuum in mass-exchange columns The present invention pertains to the field of chemical and oil refining technology. In particular, the invention relates to the vacuum distillation of liquid mixtures and relates directly to the separation of liquid mixtures. The main field of applicatio... | 07/31/2001 |
| 6228227 | Separation of (meth)acrylic acid by rectification In a process for the separation by rectification of (meth)acrylic acid from a mixture containing (meth)acrylic acid and an inert hydrophobic organic liquid having a boiling point higher than that of (meth)acrylic acid as main constituents and also lower a... | 05/08/2001 |
| 6152994 | Process for the purification of an alkanolamine A process for the purification of an aqueous alkanolamine which process involves subjecting the alkanolamine to a distillation process carried out in one or more film-type evaporators and involves at least two steps, wherein in the first step water is rem... | 11/28/2000 |
| 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 |
| 6001223 | On-site ammonia purification for semiconductor manufacture Highly purified ammonia for use in semiconductor manufacturing 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 less than 0.005 micron in size, and scrub... | 12/14/1999 |
| 5788745 | Process and apparatus for vapor recovery A process for purifying a raw natural gas stream is provided by contacting the gas stream with an absorbant to remove water and hydrocarbon impurities, separating the water and hydrocarbon impurities and absorbant from the gas stream, separating the absor... | 08/04/1998 |
| 5744009 | Method and apparatus for recovering condensables in vapor from a urea vacuum evaporator An improved urea recovery process is presented. In the improved process, multiple vacuum rated surface condensers used to condense water vapor evolved during urea vacuum evaporation/concentration are replaced by a direct contact cooler/absorber to obtain ... | 04/28/1998 |
| 5632866 | Point-of-use recycling of wafer cleaning substances A method of recycling and purifying cleaning chemicals used in the production of semiconductor circuits and containing hydrofluoric acid and or hydrochloric acid. Recycling of such chemicals is accomplished using separation and reconstitution steps Hydrof... | 05/27/1997 |
| 5500098 | Process for regeneration of volatile acids Volatile acids containing metal salt impurities, such as metal pickling solutions-are regenerated by a process in which the acid is subjected to sulfuric acid distillation. Resulting volatile acid vapor is condensed and recycled to the pickle tank, while ... | 03/19/1996 |
| 5441605 | Apparatus for reclaiming waste gas treating chemical Process and apparatus for reclaiming or concentrating waste aqueous solutions of gas treating chemicals, such as alkanolamines, used for removing acid components or water vapor from natural gas. The process involves heating the waste solution under a high... | 08/15/1995 |
| 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 |
| 5352335 | Groundwater treatment process A continuous process for the extraction of halogenated hydrocarbons from a dilute, halogenated hydrocarbon-containing aqueous fluid, in high efficiency, while dramatically reducing the stripping medium requirement for the extraction and without substantia... | 10/04/1994 |
| 5217582 | Process for the isolation of alkyl glyoxylate A process is provided for separating high purity alkyl glycolate from a gaseous reaction mixture resulting from the catalyzed gas phase oxidation of alkyl glycolate. A hot solvent which is immiscible with water but selectively dissolves alkyl glycolate an... | 06/08/1993 |
| 5186726 | Suspension deaerating process A method and apparatus for deaerating a suspension of solids in a liquid such as, for instance, papermaking stock. The suspension is flashed in a vacuum tank connected to a condenser. The vapor released when the suspension is flash cooled in the tank is c... | 02/16/1993 |
| 5174865 | Process for purifying crude hydrochloric acid Aqueous hydrochloric acid of very high purity can be obtained in a process for purifying crude aqueous 5 to 20 wt. % hydrochloric acid. In the purification, process water or a water/HCl mixture is evaporated from the crude aqueous hydrochloric acid at a p... | 12/29/1992 |
| 5066365 | Process for the isolation of vinyl acetate by distillation The invention relates to a process for the isolation of vinyl acetate which involves not combining the bottom product of the recylced gas washings with the water-saturated vinyl acetate but rather introducing it to further multiple distillation columns fr... | 11/19/1991 |
| 5061348 | Sulfuric acid reprocessor with continuous purge of second distillation vessel An apparatus and method for reprocessing waste piranha containing contaminated H2 SO4 from, for example, a semiconductor processing operation is described. The apparatus and method include a first distillation flask which is maintain... | 10/29/1991 |
| 5037511 | Process for the production of pure dimethylether A process for the production of pure dimethylether by feeding the dehydration product from a dimethylether-synthesis reactor into a distillation column for the production of pure dimethylether at defined trays of this column and withdrawal of pure dimethy... | 08/06/1991 |
| 4983260 | Process for concentrating aqueous ethylene oxide solutions A process for the concentration of ethylene oxide in an impure solution thereof including adding the solution and steam to a distillation column, recovering the gaseous stream therefrom containing ethylene oxide, and progressively condensing the steamed s... | 01/08/1991 |
| 4913778 | Molten salt scrubbing of zirconium or hafnium tetrachloride Removal of aluminum and iron impurities is accomplished using an absorbing column containing potassium or sodium chloride, producing an aluminum and iron chloride-rich bottoms product and purified Zr(Hf)Cl4 vapor at the top of the column. This ... | 04/03/1990 |
| 4865696 | Recovery of metal chlorides from their complexes by molten salt displacement This is a process for removing phosphorus oxychloride from a complex of zirconium or hafnium chloride and phosphorus oxychloride utilizing a lithium-potassium chloride molten salt absorber vessel displacing phosphorous oxychloride from the complex, with a... | 09/12/1989 |
| 4842748 | Methods for removing volatile substances from water using flash vaporization Methods for removing volatile organic substances from water employ flash vaporization techniques. The methods comprise providing water which contains volatile organic substances and is at a pressure of at least about 35 psig, releasing the water into a va... | 06/27/1989 |
| 4818347 | Process for the isolation of vinyl acetate The invention relates to a process for the isolation of vinyl acetate from a gas mixture containing vinyl acetate, ethyl acetate, water and carbon dioxide formed in the reaction of ethylene with acetic acid and oxygen in the gas phase over catalysts conta... | 04/04/1989 |
| 4802956 | Process for the purification of dimethylether by distillation The instant invention relates to a process for the purification of dimethylether, which contains impurities, by feeding a mixture which contains the dimethylether at specific trays to a distillation column and withdrawal of the dimethylether and of impuri... | 02/07/1989 |
| 4738754 | Method of recovering ammonia from an aqueous effluent which contains NH.sub . 2 and H2 S An aqueous effluent is supplied to a stripping column (total stripping column) from which a mixture that is rich in NH3, CO2 and H2 S is withdrawn as a head product. In at least one additional stripping column the mixture ... | 04/19/1988 |
| 4659433 | Concentrating and dehydrating apparatus for maleic anhydride Apparatus for concentrating and dehydrating maleic acid to form maleic anhydride, comprising: at least a first and a second vertical, independent and distinct, falling thin-film, multitubular evaporators of the static type arranged in series, wherein the ... | 04/21/1987 |
| 4636284 | Process for the separation of water from a water-containing mixture or azeotrope with an extractant, and for the separation of water from said extractant A process for the separation of water from a water-containing mixture of azeotrope, with an extractant which removes water from the mixture or azeotrope, recovery of the non aqueous portion of the mixture or azeotrope as a product, and regeneration of the... | 01/13/1987 |
| 4599455 | Process of purifying fluorinated carbonyl compound mixed with hydrogen fluoride A fluorinated carbonyl compound ##STR1## where x is 2 or 3 and A represents CF3 or H, coexisting with hydrogen fluoride in a mixed gas is purified by first adjusting the temperature of the mixed gas to 100°-300° C. to cause decomposition... | 07/08/1986 |
| 4586981 | Method of continuous decontamination of radiocontaminated liquids by distillation A method of treating a liquid containing radioactive contaminants to produce a vapor containing a reduced amount of radioactive contaminant wherein continuous evaporation is effected in a vessel comprising two interconnected sections, one surrounding the ... | 05/06/1986 |
| 4575418 | Coal cleaning and the removal of ash from coal There is disclosed the process for the separation of the clay particles (ash) from coal particles by the use of two immiscible liquids followed by the separation and removal of the liquids from the solids.... | 03/11/1986 |
| 4568427 | Continuous isolation of phthalic anhydride and maleic anhydride from reaction gases A process for the continuous isolation of phthalic anhydride and maleic anhydride from the reaction gases obtained by catalytic oxidation of o-xylene or naphthalene with air, wherein the reaction gases are treated with a hydrocarbon of boiling range from ... | 02/04/1986 |
