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| Number | Title | Issue Date |
| 7435317 | Desalination of ocean water An improved distillation of water. involves distilling significant quantities of water at temperatures well below the boiling point. During distillation, a compound is taken from a liquid-phase to a gas-phase and then condensed to the liquid-phase again to get a pur... | 10/14/2008 |
| 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 |
| 7323579 | Separation of propylene oxide from a mixture comprising propylene oxide and methanol A method of separating propylene oxide from a mixture (M) comprising 5 to 50 percent by weight propylene oxide and 50 to 85 percent by weight methanol, said method comprising (i) introducing said mixture (M) into an extractive dist... | 01/29/2008 |
| 7101582 | Dried honey enriched with volatile honey compounds A process for releasing a volatile honey components form a liquid honey is described wherein water is added to honey, extracting the volatile component and optionally adding the honey component to dried honey. The volatile honey product obtained by the process can b... | 09/05/2006 |
| 7060787 | Extraction of impurities from grafted polyolefins A process for purifying grafted polyolefins by extraction is disclosed. The purified grafted polyolefins have improved color and adhesion properties. The extraction is performed with an azeotropic solvent that is strong enough to extract impurities but does not caus... | 06/13/2006 |
| 6982026 | Azeotropic distillation process for producing organic acids or organic acid amides Disclosed herein are methods for the recovery of at least one of an organic acid or an organic acid amide, such as a heat stable lactic acid or lactamide, from a feed stream which contains the organic acid and/or organic acid amide. The feed stream is mixed with at ... | 01/03/2006 |
| 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 |
| 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 |
| 6833057 | Pure ethylene oxide distillation process In a process for purification of ethylene oxide by distillation an aqueous mixture comprising ethylene oxide, formaldehyde and at least 5% by weight of water is introduced via a feed into a distillation apparatus comprising at least one distillation column, the mixt... | 12/21/2004 |
| 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 |
| 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 |
| 6554967 | Method of refining dihydroxyaryl compound A refined dihydroxyaryl compound, for example, catechol, having a high degree of purity and a very low metal content is produced by evaporating a starting dihydroxyaryl compound in a distillation column, condensing the vapor fraction in a condenser connec... | 04/29/2003 |
| 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 |
| 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 |
| 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 |
| 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 |
| 6261412 | Regenerative heat recovery for high temperature condensate stripping plants The EPA Cluster Rules for cellulose pulp mills are complied with by first collecting foul condensate including hazardous air pollutants (HAPs), such as methanol, at a temperature of between about 140-180° F., and passing the foul condensate into direct c... | 07/17/2001 |
| 6214172 | Preparation of methylglyoxal dimethyl acetal In a process for the preparation of methylglyoxal dimethyl acetal from methylglyoxal and methanol in the presence of an acidic ion exchanger, water is introduced in an amount sufficient to form an acidic reaction mixture in which the acetal product and wa... | 04/10/2001 |
| 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 |
| 5849982 | Recovery of styrene from pyrolysis gasoline by extractive distillation An extractive distillation process for separating at least one substituted unsaturated aromatic from a pyrolysis gasoline mixture, containing said aromatic and at least one close-boiling aromatic or non-aromatic hydrocarbon, employing a two part extractiv... | 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 |
| 5779861 | Method for treating process condensate An apparatus and method for treating chemical production plant process condensate and low pressure purge gas such that a contaminant-rich stream is recoverable from the condensate and purge gas, wherein the contaminants are substantially removed from the ... | 07/14/1998 |
| 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 |
| 5723433 | Sovent removal process A method of removing solvents from a paste includes introducing a heated paste into a channel of a dryer under pressure selected so as to avoid flashing of any of the components of the paste. At the inlet of the channel, the pressure is dropped, resulting... | 03/03/1998 |
| 5643420 | Method for treating process condensate An apparatus and method for treating chemical production plant process condensate such that a contaminant-rich stream and a relatively pure aqueous stream is separately recoverable from the condensate, wherein the contaminants are substantially removed fr... | 07/01/1997 |
| 5626724 | Recovery of N-ethylpiperazine by distillation In a process for the recovery of N-ethylpiperazine by distillation from mixtures with N,N'-diethylpiperazine, piperazine, ethanol, water and accompanying substances, water is added in a manner such that, at the location of the addition of the water, the p... | 05/06/1997 |
| 5620567 | Process for the removal of aldehydes and acetals from industrially prepared acetic acid A process for the removal of aldehydes and acetals from industrially prepared acetic acid, wherein the contaminated acetic acid is reacted in the presence of a Bronstedt acid and 0.05 to 1% by weight of water and, if required, of 3 to 10 equivalents, calc... | 04/15/1997 |
| 5582694 | Hydrodistillation process for essential mint oils A process for the hydrodistillation of mint oils from chopped mint plant. This process selectively collects mint oil condensates according to predetermined time, pressure and temperature parameters to better control the quality and quantity of mint oil di... | 12/10/1996 |
| 5545296 | Water and organic constituent separator system and method A regenerating system, for the removal of water and potentially harmful organic constituents from a hydration fluid used to dehydrate natural gas. The system includes a device to assure positive flow of the water and organic constituent vapor out of the r... | 08/13/1996 |
| 5531866 | Water and organic constituent separator system and method A regenerating system, for the removal of water and potentially harmful organic constituents from a dehydration fluid used to dehydrate natural gas. The system includes a device to assure positive flow of the water and organic constituent vapor out of the... | 07/02/1996 |
| 5529667 | Process for recovering ethylene oxide In an improved process for recovering ethylene oxide from an aqueous ethylene oxide solution further containing formaldehyde is provided wherein the impure aqueous ethylene oxide solution is introduced into a distillation zone as a feed stream and undergo... | 06/25/1996 |
| 5522971 | Dry neutralization of olefinically reactive organic liquid phases Pure, substantially neutral, low-volatile organic compounds including reactive double bonds are advantageously isolated from a liquid feedstock which contains said compounds in combination with acidic reaction components or auxiliary materials by (i) addi... | 06/04/1996 |
| 5510097 | Hydroxylammonium nitrate free of ammonium nitrate The present invention relates to a multi-step process for producing HAN that is free of ammonium nitrate. The process comprises the steps of: (a) stripping ammonia from an ammonia-containing, aqueous hydroxylamine solution having a hydroxylamine concentra... | 04/23/1996 |
| 5470441 | Packed column vaporizer and vaporizing process An apparatus for vaporizing volatile liquids comprises a packed column, a gas inlet port (for introducing a hot entrainer gas), a feed tube (for introducing a volatile liquid), a feed distributor comprising a base plate equipped with orifices (through whi... | 11/28/1995 |
| 5450892 | Alkaline scrubber for condensate stripper off-gases This invention relates to an alkaline scrubber for condensate stripper off-gases. In particular, this invention relates a process for selectively removing hydrogen sulfide and methyl mercaptan from a gas stream containing these compounds and methanol. Suc... | 09/19/1995 |
| 5441607 | Recovery of caprolactam from distillation residues obtained in the purification of caprolactam Recovery of caprolactam and of an alkali metal carbonate from distillation residues which are obtained in the purification of caprolactam and contain caprolactam and/or oligomers and/or polymers of caprolactam and also alkali metal hydroxides by (a) melti... | 08/15/1995 |
