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| Number | Title | Issue Date |
| 8142618 | Processes for preparing pure xylylenediamine A process comprising: continuously distilling a crude xylylenediamine in a column to form a pure xylylenediamine and a bottom product, wherein the column comprises a distillation column having a side draw and the distillation column is operated under a reduced press... | 03/27/2012 |
| 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 |
| 7431806 | Low energy vacuum distillation method and apparatus A sub-atmospheric pressure desalinating still employs a closed top, open bottom pipe filled with source water to be distilled, such as seawater, having a height greater than the height of a column of seawater that can be supported by the pressure at the bottom of th... | 10/07/2008 |
| 7291250 | Vacuum distillation system and use thereof for concentrating organic-aqueous solvent mixtures The present invention relates to a vacuum distillation plant and a process for concentrating organic aqueous solutions, especially spissum extracts, using said plant. The vacuum distillation plant of the invention comprises a flash evaporator, a means for vapor conc... | 11/06/2007 |
| 7189311 | Purification of difluoromethane A method for separating difluoromethane from a mixture of difluoromethane and at least one impurity, the method involving extractively distilling the mixture using dichloromethane as an extractive agent to recover a product stream of purified difluoromethane having ... | 03/13/2007 |
| 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 |
| 7060865 | Recovery of C4 olefins from a product stream comprising C4 olefins, dimethyl ether and C5+ hydrocarbons Disclosed is a process for removing DME from a stream containing C4 olefins. The process includes providing a first stream comprising C4 olefins, C5+ hydrocarbons, DME, and methanol. The first stream is separated into a second stream comprising the C4 olefins and th... | 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 |
| 6939444 | 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... | 09/06/2005 |
| 6936140 | Water distillation system A distillation system is provided for recovering water from sea water and other polluted water source. The system has a heat engine embodying Carnot cycle and a Rankine cycle formed by heat exchangers, flash evaporator and condenser. Burnt gases from the engine such... | 08/30/2005 |
| 6926810 | Process for obtaining an organic acid from an organic acid ammonium salt, an organic acid amide, or an alkylamine organic acid complex Disclosed herein are methods for the recovery of an organic acid, such as a heat stable lactic acid, from a feed stream which contains at least one of an organic acid amide, an organic acid ammonium salt, or an alkylamine-organic acid complex. The feed stream is mix... | 08/09/2005 |
| 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 |
| 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 |
| 6758946 | Recycling hydroxylamine-containing stripper solutions A process for working up hydroxylamine-containing solutions as obtained in particular in the electronics industry during the cleaning of electronic components is described. According to the invention, the hydroxylamine is stripped from the wastewater with steam. The... | 07/06/2004 |
| 6735979 | Process for pretreating a natural gas containing acid gases A process for pretreating a very acid natural gas containing a substantial amount of hydrogen sulfide (H2S), possibly combined with carbon dioxide (CO2), includes at least a stage wherein the initial natural gas is contacted in a distillation c... | 05/18/2004 |
| 6572831 | Materials treatment A material contaminated with a solvent is treated with a hydrofluorocarbon to remove the contaminant. The hydrofluorocarbon can be tetrafluoroethane.... | 06/03/2003 |
| 6547933 | Process for the purification of aromatic polyamines A process for the purification of a mixture of aromatic polyamines obtained by hydrogenation of the corresponding aromatic polynitro compounds, said mixture including the various isomers of the said amines as well as reaction by-products, including the st... | 04/15/2003 |
| 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 |
| 6454907 | Method and apparatus for concentrating slurried solids Method and apparatus for concentrating slurries by removing liquid in a single effect unit maintained under vacuum to effect low temperature flashing of the liquid. The single effect unit is a single flash column with separate recirculation loops, one to ... | 09/24/2002 |
| 6398918 | Method for distilling a mixture containing a plurality of components and apparatus for realizing the same Pertaining mainly to the field of the petrochemical industry the method essentially includes delivery of a motive liquid into a liquid-gas ejector from a separator by a pump, feeding a liquid-gas mixture obtained in the ejector into the separator, cooling... | 06/04/2002 |
| 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 |
| 6340414 | Process for the recovery of perfluorinated sulphonic acids from spent acid Process for the recovery of fluorinated sulphonic acid including the step of subjecting the spent acid to heat treatment with stepwise or continuously increasing temperature, withdrawing at least two fractions during the heat treatment; and recovering the... | 01/22/2002 |
| 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 |
| 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 |
| 6251228 | Photopolymer washout fluid solvent distillation apparatus and method A waste photopolymer plate washout fluid solvent distillation apparatus includes a single enclosure enclosing a waste washout fluid container, a recovered solvent container, and a distillation unit in which waste washout is distilled by application of hea... | 06/26/2001 |
| 6234760 | Pumping-ejection apparatus and variants The invention relates to the field of jet technology, primarily to apparatus for evacuation and gaseous mediums' compression. Apparatus is furnished by liquid-gas ejector, pump, separator and condenser. Ejector contains receiving chamber, which has a space in ... | 05/22/2001 |
| 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 |
| 6120651 | Method for removing water from an aqueous fluid mixture A method permits concentration of a water-miscible organic liquid in a mixture of such liquid and water, with recovery of a desired concentrate of the water-miscible organic liquid and water, and a relatively clean water containing only a very low contest... | 09/19/2000 |
| 6042618 | Dry cleaning method and solvent The present invention comprises a dry cleaning system and method, in which dry cleaning machinery is used in conjunction with a specific solvent which is derived from an organic/inorganic hybrid (organo silicone). In this class of organo silicones is a gr... | 03/28/2000 |
| 6033530 | Continuous distillation of thermolabile monomers A process for the continuous distillation of thermolabile monomers under reduced pressure in a column includes feeding the thermolabile monomers in vapor or liquid form to the column, introducing an inert distillation aid which forms a heteroazeotrope with the... | 03/07/2000 |
| 6004434 | Method of recycling cleaning solvent A method of treating cleaning solvent used to clean mechanical parts. The method includes adding to the cleaning solvent a treating composition selected from the group of C5 -C14 alcohols, C2 -C8 dials, C10... | 12/21/1999 |
| 5980698 | Method for vacuum distillation of a liquid product and an equipment for performing thereof A method for vacuum distillation includes separation of a liquid product delivered to a reservoir under vacuum into a vapour-gaseous phase and at least one liquid fraction, withdrawal of the vapour-gaseous phase from the reservoir using a vacuum-creating ... | 11/09/1999 |
| 5972174 | Process for the purification of maleic anhydride Processes for the purification and color stabilization of crude maleic anhydride by distillation in a batch or continuous distillation column.... | 10/26/1999 |
| 5964987 | Neutral oil removal from natural cresylic acid mixtures Natural cresylic acid is processed to remove neutral oil impurities by countercurrent liquid/liquid extraction using a heavy phase solvent of a mixture of glycerol and another polyhydric alcohol, preferably triethylene glycol. The light phase solvent is a... | 10/12/1999 |
| 5928477 | Method and apparatus for removing water from an aqueous fluid mixture A method and apparatus permits concentration of a water-miscible organic liquid in a mixture of such liquid and water, with recovery of a desired concentrate of the water-miscible organic liquid and water, and a relatively clean water containing only a ve... | 07/27/1999 |
| 5902458 | Method of separating sesamin analogues A steam stripping substance, which is obtained by steam distillation of sesame oil under reduced pressure and contains sesamin analogues substantially, is mixed with water, a water-soluble solvent or their mixture serving as solvent. Sesamin analogues are... | 05/11/1999 |
| 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 |
| 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 |
| 5776319 | Continuous linear-torroidal extraction method A method for continuously extracting a solute from a carrier medium. A volatile solvent is placed in a lower distillation chamber of a vessel, the vessel including a convergent baffle disposed to separate the vessel into a lower distillation chamber and a... | 07/07/1998 |
