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| Number | Title | Issue Date |
| 8163138 | Method for processing effluent from chloromethylation of vinyl aromatic polymers A method for processing effluent from a chloromethylation of a vinyl aromatic polymer wherein the effluent includes catalyst and volatile organics, and wherein the method includes the steps of: 1) deactivating at least a portion of... | 04/24/2012 |
| 7615137 | Process for recovering caprolactam from aqueous caprolactam product using in situ prepared alkali amino caproate A continuous process is provided for recovering caprolactam from aqueous caprolactam product which includes (i) caprolactam, (ii) impurities, and (iii) water by (a) adding alkali hydroxide to the aqueous caprolactam product, in an amount of not more than 100 mmol al... | 11/10/2009 |
| 7384518 | Method for purifying lactams A method and a plant are disclosed for purifying lactams, particularly lactams obtained by cyclizing hydrolysis of aminonitrile. The purification of ε-caprolactam obtained by cyclizing hydrolysis of aminocapronitrile is described which includes eliminating the ammo... | 06/10/2008 |
| 7309403 | Method for avoiding corrosion The invention relates to a method of avoiding corrosion in the separation of methylamine from a product stream (10) which is obtained in the preparation of methylamines by gas-phase reaction of methanol and ammonia and includes monomethylamine, dimethylamine,... | 12/18/2007 |
| 7268256 | Method of purifying quaternary alkyl ammonium salt and quaternary alkyl ammonium salt Provided is a method for purifying a quaternary alkyl ammonium salt enabling the obtainment of a particulate quaternary alkyl ammonium salt having a low water content at a high yield which is suitably used as an electrolyte in an electrolytic solution. The me... | 09/11/2007 |
| 7250527 | Process for recovering acrylonitrile or methacrylonitrile A process for the recovery of acrylonitrile or methacrylonitrile from an aqueous solution comprising subjecting the said solution to a water extractive distillation by feeding the solution to a distillation column and performing said extractive distillation and usin... | 07/31/2007 |
| 7230126 | Method for obtaining optically active epoxide The present invention provides a method capable of suppressing a decrease in optical purity due to the exposure to heat during distillation of an optically active epoxide to permit an optically active epoxide of high quality to be simply obtained on an industrial sc... | 06/12/2007 |
| 7196231 | Process for removal of acrolein from acrylonitrile product streams Acrolein is removed from a process stream such as a process stream generated in the manufacture of acrylonitrile. The process includes reacting the acrolein with a compound containing a reactable thiol or hydroxyl moiety in the presence of an acid catalyst. The pres... | 03/27/2007 |
| 7169946 | Alternatives to distilled oleo chemicals in derivatives and production thereof As a substitute for distillation of crude feedstock in the production of oleo-chemicals, the crude feedstock is bleached to remove color and odor. The crude feedstock can include fatty acids and/or glycerin, and the bleached product can be incorporated into a commer... | 01/30/2007 |
| 7105078 | Method for producing an aqueous hydroxylamine solution devoid of salt A process for preparing a salt-free aqueous hydroxylamine solution by reacting an aqueous solution of a hydroxylammonium salt with a base to give a mixture and separating from said mixture by distillation a salt-free aqueous hydroxylamine solution, involving using a... | 09/12/2006 |
| 7094917 | Processes for refining compositions containing dialkyl carbonates Processes for refining dialkyl carbonate-containing compositions are described, wherein a composition comprising a dialkyl carbonate is provided; and the composition is subjected to a rectification wherein low-boiling impurities are removed, and a rectification wher... | 08/22/2006 |
| 7074434 | Process for the separation of a mixture comprising at least one hydrofluoroalkane and hydrogen fluoride, processes for the preparation of a hydrofluoroalkane and azeotropic compositions Process for the separation of a mixture comprising at least one hydrofluoroalkane and hydrogen fluoride, according to which a hydrofluoroalkane/hydrogen fluoride mixture is reacted with at least one chlorinated or chlorofluorinated precursor of the hydrofluoroalkane... | 07/11/2006 |
| 7074304 | Process for purifying alicyclic alcohols A process for purifying alicyclic alcohols by distillation, wherein the alicyclic alcohols are distilled in the presence of from 1 to 550 ppm of acidic compounds. ... | 07/11/2006 |
| 7049450 | Process for the purification of crude propene oxide A process for the purification of a crude propene oxide containing methanol and acetaldehyde by a continuously operated extractive distillation using an extraction solvent lowering the volatility of methanol and feeding a compound containing an unsubstituted NH... | 05/23/2006 |
| 7045100 | Method for producing fatty acid methyl ester and equipment for realizing the same Method for producing fatty acid methyl ester, including compounding saturated and unsaturated higher fatty substances from at least one of vegetable and animal with an alkaline solution dissolved in alcohol to form a mixture. The method also includes emulsifying the... | 05/16/2006 |
| 7022844 | Amide-based compounds, production, recovery, purification and uses thereof Methods are disclosed of producing and purifying at least one amide. In accordance with one of the methods disclosed herein, the at least one amide is produced by providing an organic liquid comprising at least one oxime, providing at least one catalyst, adding the ... | 04/04/2006 |
| 7002048 | Method for removal of acetol from phenol A method is provided for the efficient, low cost removal of acetol from a phenol stream. The method results in removal of substantially all of the acetol from the phenol stream without the formation of substantial amounts of additional methylbenzofuran. The method a... | 02/21/2006 |
| 6943270 | High selective method of producing cumene hydroperoxide, phenol and acetone in an oxidation by-product conversion process A cumene process of producing phenol and acetone comprises the joint oxidation of aldehydes and dimethylbenzene alcohol by aqueous hydrogen peroxide solutions in presence of 16 wt % to 94 wt % of cumene hydroperoxide by contacting of mutually insoluble phases of the... | 09/13/2005 |
| 6933414 | Acetone process A process is provided for the production of acetone from formaldehyde and methyl chloride. In the process formaldehyde is reacted in the vapor phase with methyl chloride to produce acetone and hydrogen chloride. Acetaldehyde may be formed as an intermediate in the r... | 08/23/2005 |
| 6695928 | Method for production of (meth) acrylic acid and/or (meth)acrylic esters A method for the production of (meth)acrylic acid and/or a (meth)acrylic ester is provided. This method for the production of (meth)acrylic acid and/or a (meth)acrylic ester includes washing the device constructed for the production thereof with a basic s... | 02/24/2004 |
| 6685802 | Process and apparatus for removing dissolved and undissolved solids from liquids This invention relates to a continuous process and an apparatus (1) for removing dissolved and undissolved solids and/or high boiling point liquid contaminants from a mixture of miscible liquids (9). A recycle liquor stream (6) is fed at high velocity thr... | 02/03/2004 |
| 6632331 | Distillation of polycyclic diol Aldehyde compounds contained in polycyclic diols as impurities are effectively removed by distilling the polycyclic diols in the presence of an alkali metal compound and/or a alkaline earth compound. The distilled polycyclic diols are useful as a diol com... | 10/14/2003 |
| 6387224 | Method for distilling mixtures containing butanediol A process for the separation by distillation of a mixture of 1,4-butanediol and at least one 4-hydroxybutyraldehyde, its cyclic hemiacetal and its cyclic full acetals with at least one further alcohol by carrying out the distillation in the presence of an... | 05/14/2002 |
| 6299737 | Recovery of glycols from used glycol-containing technical fluids A process for recovering glycols from used glycol-containing technical fluids, especially from used antifreeze comprises adding to the used glycol-containing technical fluids an organic solvent which forms with the glycol to be separated off an azeotropic... | 10/09/2001 |
| 6117277 | Process for the distillation of alcohols The invention relates to a process for the purification of C3 -C10 -alcohols by distillation, by distilling the alcohols at 150 to 200° C. in the presence of 10 to 1000 ppm of alkali metal hydroxide.... | 09/12/2000 |
| 6093855 | Separation of the divinyl ether of diethylene glycol or triethylene glycol from the monovinyl ether of the corresponding oliogethylene glycol The divinyl ethers of diethylene glycol or triethylene glycol are separated from the monovinyl ether of the corresponding oligoethylene glycol by distillation, a metal hydroxide being added to the vinyl ether mixture.... | 07/25/2000 |
| 5961788 | Sequential distillation process for removing tetrahydroazepine from aminocapronitrile and/or hexamethylenediamine A process for removing tetrahydroazepine from aminocapronitrile or hexamethylenediamine by sequential distillation in which the overhead from the second distillation is combined with a fresh, incoming mixture of tetrahydroazepine and aminocapronitrile or ... | 10/05/1999 |
| 5910234 | Recovery of alcohols from process wastewater from production of silicone resin This invention relates to a process for working up the alcohol-containing wastewater which is obtained in the hydrolysis of silanes of the general formula I R1a SiClb (OR2)4-a-b (I), where R | 06/08/1999 |
| 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 |
| 5788818 | Process for the purification of acetone A process for the purification of raw acetone deriving from processes for the production of phenol acetone, impurity mainly due to cumene, water, aldehydes and methanol, the steps of: feeding the stream of raw acetone coming from the primary fractionation of ... | 08/04/1998 |
| 5728272 | Separation by rectification of unsaturated carboxylic acids from solvents In a process for the separation by rectification of unsaturated carboxylic acids from solvents in which the acids were absorbed after the synthesis reaction, the rectification is briefly interrupted and the rectification column is flushed with a basic sol... | 03/17/1998 |
| 5700358 | Recovery of caprolactam from oligomers and/or polymers of caprolactam Caprolactam is recovered from oligomers and/or polymers of caprolactam by cleavage of oligomers and/or polymers of caprolactam and subsequent working up by distillation of the caprolactam obtained in the cleavage, by a process including (a) cleaving oligo... | 12/23/1997 |
| 5667644 | Method for producing a dimerized aldehyde A method for producing a dimerized aldehyde, which comprises subjecting a feed aldehyde to a condensation reaction and a dehydration reaction in the presence of a basic catalyst, wherein the feed aldehyde is the one having one or two hydrogen atoms at the... | 09/16/1997 |
| 5616217 | Controlled alkali treatment in the recovery of methyl tertiary butyl ether In the manufacture of MTBE from TBA and methanol, acidic by-products formed during the etherification reaction are removed by fractionating the etherification reaction product in a first MTBE distillation column to provide a first lower boiling distillati... | 04/01/1997 |
| 5591311 | Process for purifying a 2,6-dialkylphenol A process for purifying impure 2,6-diisopropylphenol (DIP) mixtures having lower and higher boiling phenolic impurities is described. The process involves washing the mixture with aqueous alkali metal hydroxide solution in an inert atmosphere and separati... | 01/07/1997 |
| 5554796 | Removal of primary and secondary hydroperoxide impurities from tertiary hydroperoxides A process for the purification of tertiary alkyl hydroperoxide containing contaminating quantities of primary and secondary alkyl hydroperoxides by contacting the impure hydroperoxide mixture with anhydrous carboxylic acid derivative such as maleic anhydr... | 09/10/1996 |
| 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 |
| 5516406 | Process for purifying acids formed during liquid phase oxidation of butane A method of purifying the oxidate product formed by the liquid phase oxidation of C4 -C8 paraffinic hydrocarbons comprises adding a strong acid catalyst to the oxidate product to catalyze the break down of Michael addition products o... | 05/14/1996 |
| 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 |
| 5489366 | Recovery of purified and substantially anhydrous propylene oxide A distillation method for the purification of crude propylene oxide containing contaminating quantities of water and methanol by partially purifying the crude propylene oxide in a plural stage distillation zone to provide a vaporized overhead distillate p... | 02/06/1996 |
