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| Number | Title | Issue Date |
| 7442348 | Sulfur-bearing residue treatment system A sulfur-bearing residue treatment system is provided for the recovery of valuable organic components and the reduction of capital costs and operating costs. The treatment system involves the use of a stripping vessel in conjunction with a heating apparatus. All ele... | 10/28/2008 |
| 7331354 | Cleaning of tray columns which have been used for rectificatively treating liquids comprising (meth)acrylic acid and/or esters thereof In process for cleaning tray columns which are used for the purposes of rectifiying liquids comprising (meth)acrylic compounds, a basic liquid is conveyed downward through the tray column and a gas is passed through the column in countercurrent to the basic liquid a... | 02/19/2008 |
| 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 |
| 7258766 | Method for collecting acrylic acid A method for collecting acrylic acid is provided, which includes the step of collecting acrylic acid using an aqueous medium from a reaction gas containing acrylic acid obtained by catalytic vapor-phase oxidation of propane, propylene, and/or acrolein, the step bein... | 08/21/2007 |
| 7189377 | Apparatus for performing integrated process for reproduction of vinyl acetate and/or acetic acid using a fluidized bed 1. Acetic acid and/or vinyl acetate are produced by an integrated process which comprises the steps:— (a) contacting in a first reaction zone a gaseous feedstock comprising ethylene and/or ethane and optionally steam with a molecular oxygen-containing... | 03/13/2007 |
| 7128814 | Process for separating 2-butanol from tert-butanol/water mixtures The present invention relates to a process for separating 2-butanol from tert-butanol/water by adding of tert-butanol such that the water concentration lowers to less than the limit concentration of the distillation boundary line connecting the two azeotropes TBA/wa... | 10/31/2006 |
| 7125474 | Process for removing 2-butanol from tert-butanol/water mixtures The invention relates to a process for separating 2-butanol from an industrial mixture which includes 2-butanol, tert-butanol and water by separating water from the industrial mixture by distillation to obtain a distillate, wherein the distillate has, in terms of th... | 10/24/2006 |
| 7105687 | Propylene oxide purification and recovery In accordance with the invention, propylene oxide is formed by reaction of propylene and hydrogen peroxide or by reaction of propylene, oxygen and hydrogen in methanol solvent, methanol and methyl formate are separated from propylene oxide by extractive distillation... | 09/12/2006 |
| 6956101 | Method and installation for extracting a monomer from an aqueous slurry containing a polymer Process and installation for extracting a monomer from an aqueous broth of a polymer, in which, after the broth has been heated, the broth is subjected to a depressurization in a depressurization chamber and is then introduced into a vertical column, divided into se... | 10/18/2005 |
| 6852199 | Method for separating pentenenitrile isomers A process is provided for the distillative separation of pentene nitrile isomers which have a relative volatility alpha ranging from 1.0 to 1.3 in the pressure range from 1 to 500 kPa, wherein the distillation is carried out in the presence of a liquid diluent which... | 02/08/2005 |
| 6844480 | Method of separating dimethyl ether from an olefin stream This invention is directed to a method of removing dimethyl ether from an olefin stream. Dimethyl ether is removed from the olefin stream by first separating the olefin stream into a first stream comprising dimethyl ether and lighter boiling point compounds, and a s... | 01/18/2005 |
| 6843890 | Purification and recovery of acetonitrile from waste solvent acetonitrile A process of treating waste solvent acetonitrile streams which contain at least one water extractable impurity such as isopropyl acetate to remove substantially all of the impurity by distilling the waste solvent acetonitrile in the presence of water for a time suff... | 01/18/2005 |
| 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 |
| 6613197 | Method for isolation of barely volatile organic compounds A method and apparatus for isolation of a barely volatile organic compound in a sample suspected to contain the same, e.g. a dioxin, which includes continuously adding superheated steam and a volatile and hardly water-soluble/water-insoluble solvent to a ... | 09/02/2003 |
| 6521097 | Process for separating hydrogen chloride from a mixture comprising an N-alkyl-2-pyrrolidone and hydrogen chloride A process for separating hydrogen chloride from a mixture including an N-(C1 -C18)-alkyl-2-pyrrolidone and hydrogen chloride by distilling the mixture including an N-(C1 -C18)-alkyl-2-pyrrolidone and hydrogen ch... | 02/18/2003 |
| 6478930 | Impurities separation by distillation A distillation procedure is provided for the separation of impurities from organic materials such as glycols and glycol ethers whereby a liquid stripping component is interfaced into a distillation column with or below the organic material introduction, h... | 11/12/2002 |
| 6379507 | Process for producing methylal A process for producing methylal that involves feeding a liquid containing methanol, formaldehyde and water to an uppermost reactor of at least four solid acid catalyst-filled reactors which are each externally connected to an intermediate portion of a di... | 04/30/2002 |
| 6375804 | Tertiary butyl acetate recovery The present invention provides a distillation separation method whereby tertiary butyl acetate is separated by distillation as an overhead stream from a bottoms acetic acid stream with the proviso that water is incorporated in the system such that the bot... | 04/23/2002 |
| 6358373 | Production of polyamides by reactive distillation The preparation of polyamides, their oligomers or mixtures thereof, where appropriate with other reaction products, takes place by reacting amino nitrites (A) and, where appropriate, other polyamide-forming monomers and/or oligomers with water (D) in a re... | 03/19/2002 |
| 6332958 | Methods and apparatus for removing residual monomers An apparatus and a method for removing residual monomers from a slurry containing a polyvinyl chloride. The apparatus has a cylindrical tower with plural perforated plates provided in a vertical direction in the tower, plural chambers formed on the perfor... | 12/25/2001 |
| 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 |
| 6306263 | Impurities separation by distillation A distillation procedure is provided for the separation of impurities from organic materials such as glycols and glycol ethers whereby a liquid stripping component is interfaced into a distillation column with or below the organic material introduction, h... | 10/23/2001 |
| 6264800 | Purification process A procedure is provided for the separation of close boiling impurities from products which have slightly higher polarity than the impurities, for example, separation of di-propylene glycol di-tert-butyl ether (DE) from di-propylene glycol mono-tert-butyl ... | 07/24/2001 |
| 6228226 | Process for working up crude, liquid vinyl acetate A process for working up crude, liquid vinyl acetate feed containing acetic acid, water and ethyl acetate and optionally smaller amounts of other impurities by distillation, wherein there is introduced into the distillation column, above the feed point of... | 05/08/2001 |
| 6214173 | On-site manufacture of ultra-high-purity nitric acid Provided is a novel on-site system and method for providing ultra-high-purity nitric acid to a point of use. The system includes a source of nitric acid at a concentration greater than 68 wt %; a reflux distillation column having an inlet in communication... | 04/10/2001 |
| 6193849 | Fractionator with liquid-vapor separation means A fractionator has a fractionation vessel, a reactor effluent vapors inlet, a vapor feed contacting zone, a baffled contacting section above the vapor feed contacting zone, a tops section above the baffled contacting section, a heavy bottoms liquid hold-u... | 02/27/2001 |
| 6100427 | Production of amides and/or acids from nitriles A process for producing an amide and/or acid from a nitrile comprises introducing a nitrile, as a first reactant, and a hydration compound, as a second reactant which is capable of reacting with the nitrile to convert it to its corresponding amide thus hy... | 08/08/2000 |
| 6086723 | Process for cooling dispersions and liquids A process for deodorizing and subsequently cooling dispersions or liquids comprising a) passing steam through the dispersion or liquid to be cooled and held in a vessel (1), said dispersion or liquid being caused to foam up as a result, b) discharging the... | 07/11/2000 |
| 6030524 | Refinery atmospheric pipestill with methanol stripping In an atmospheric pipestill stripping process where steam is utilized as the stripping gas to strip bottoms and side stream products, the improvement comprising utilizing methanol or a methanol and steam mixture as said stripping gas. In a refinery atmosp... | 02/29/2000 |
| 5989394 | Process for treatment of a contaminated liquid A process for purification treatment of an impure liquid, such as a contaminated condensate, obtained when producing paper or paper pulp. The liquid is introduced intro a stripper device at an admission point (C) and the stripper device is also supplied w... | 11/23/1999 |
| 5980696 | Dehydration of acetic acid by azeotropic distillation in the production of an aromatic acid An improved process for preparing an aromatic dicarboxylic acid wherein the improvement resides in dehydrating and recovering solvent from a feed stream having from 20% to 40% by weight water via azeotropic distillation with organic phase reflux using an ... | 11/09/1999 |
| 5968321 | Vapor compression distillation system and method Distillation system having an evaporator/condenser core with heat transfer plates welded together along their edges to form alternate boiling and condensing chambers. Feed liquid is supplied to the boiling chambers through a pair of heat exchangers which ... | 10/19/1999 |
| 5866721 | Process for separating the product gas mixture from the catalytic synthesis of methyl mercaptan A process for separating the product gas mixture from the catalytic synthesis of methyl mercaptan. Because of improved separation of the product gas mixture into its components, less hydrogen sulfide and methyl mercaptan are lost in discharging the inert ... | 02/02/1999 |
| 5849161 | Method for treating solution of organic compound A solution of an organic compound containing at least a polymer is treated by adding an amount of water to said solution, distilling the organic compound to recover the organic compound, and incinerating the remained aqueous solution containing the polyme... | 12/15/1998 |
| 5837107 | Process for production of aqueous solutions of free hydroxylamine An aqueous solution of free hydroxylamine is prepared by a process in which the solution obtained by treating a hydroxylammonium salt with a base is separated into an aqueous hydroxylamine solution and a salt fraction by treatment with water or steam at à... | 11/17/1998 |
| 5824196 | Decontamination of RPET by steam distillation Organic contaminants are removed from RPET flakes by a process that includes steam-stripping the contaminants out from the matrix of the RPET flakes. In an alternative embodiment, the RPET flakes are first comminuted to prepare RPET particles, and the RPE... | 10/20/1998 |
| 5804039 | Method for removing residual monomers A method for removing residual vinyl chloride monomers from an aqueous slurry is disclosed. The method preferably utilizes a tower having a plurality of vertically spaced plates, which define a plurality of chambers, each chamber defined between adjacent ... | 09/08/1998 |
| 5795446 | Method and equipment for heat-of-vaporization transfer A method and equipment for heat-of-vaporization transfer in a heat exchanger, using steam bubbles. To achieve higher transfers at slight overheating, and with a very simple design, steam bubbles are introduced into evaporation chambers formed between heat... | 08/18/1998 |
| 5738762 | Separating oil and water from emulsions containing toxic light ends An improved process for separating oil and water from an emulsion containing toxic light ends by flashing the heated and pressurized emulsion, condensing and separating the vaporized water and light ends, recovering the light ends, and recycling the conde... | 04/14/1998 |
| 5718810 | Methanol recovery using extractive distillation A method for recovering methanol from sulfur-based wood pulping process vapors, which contain at least methanol and dimethyl disulfide. The method involves three steps. The first step consists of introducing the vapors into a first distillation tower at a... | 02/17/1998 |
