Class 203/34 - Acid

Subclass of Class 203 - Distillation: processes, separatory
Definition: Processes in which the added material is an acid.
No. of patents: 71
Last issue date: 05/18/2010

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Number	Title	Issue Date
7718039	Process for reactive distillation of a carboxylic acid A process for reactive distillation wherein a carboxylic acid is reacted in a reaction section of a reactive distillation column with an alcohol under esterifying conditions in the presence of a catalyst to form an ester, wherein a first supply stream comprising the...	05/18/2010
7452448	Fat producing method A method for producing a fat by distillation and purification while preventing isomerization. The distillation and purification is conducted under an acidic condition to prevent isomerization. ...	11/18/2008
7416645	Continuous process for recovering acetone from a waste stream resulting from acetone purification The present invention provides a continuous process for recovering acetone from a waste stream from an acetone purification stage. The waste stream contains mesityl oxide and optionally acetone. The process for recovering acetone includes separating the waste stream...	08/26/2008
7235183	Glycerine foots salt separation system The present invention provides a method and apparatus for the recovery of salt from a glycerine process, allowing the salt to be used in a brine solution. A salt settling tank is positioned inline between the foots from a crude still bottom and a foot still. Salt se...	06/26/2007
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
7164044	Process for producing high purity trialkanolamine A process for producing a high purity trialkanolamine excelling in hue and having an APHA of not more than 40, characterizing by including producing a mixed alkanolamine by the reaction of an alkylene oxide with ammonia; removing low-boiling substances from the mixe...	01/16/2007
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
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
6966974	Process for evaporating a solution and an evaporator for use in the process The invention relates to a method for evaporating a solution and an evaporator applied to it. The evaporator (1) has parallel plate heat exchanger elements (3) fitted inside a jacket (2), consisting of a flexible plastic film, for example, and a...	11/22/2005
6924399	Method of manufacturing dimethyl ether Dimethyl ether is obtained with at low cost by transporting methanol under room temperature and atmospheric pressure from the methanol producing district to the dimethyl ether consuming district or its neighboring district by converting the raw material containing t...	08/02/2005
6668947	Drill cutting treatment method A method and apparatus for treating for disposal oil-contaminated clay substrates such as drill cuttings from drilling with an oil-based mud. If necessary, the substrate is pretreated with an aqueous emulsion breaker such as alkylbenzenesulfonic acid. The...	12/30/2003
6666973	Method for fixing fluorine and phosphorus in waste water containing fluorophosphoric acid-derived compound to remove them A method is provided for fixing and eliminating fluorine and phosphorus in waste water wherein the waste water includes a fluorophosphate compound in which hydrochloric acid is added to the waste water including the fluorophosphate compound. The waste wat...	12/23/2003
6638398	Methods for the evaporation of an aqueous solution containing ammonia A method including evaporating aqueous solutions containing ammonia, adding an acid to the evaporated vapor flow to form an ammonium salt, and condensing the vapor flow to form a liquid containing the salt. By this method the ammonia formed into a salt is...	10/28/2003
6464838	Process for the recovery of compounds present in the heavy products after their preparation A process for the recovery of compounds present in a mixture containing residues of heavy products is provided. The process includes conducting a reaction and distillation to obtain the compounds and residues and macerating the residues before they can se...	10/15/2002
6274726	Pressure-enhanced extraction and purification The invention is based on the discovery that hyperbaric, hydrostatic pressure reversibly alters the partitioning of biomolecules between certain adsorbed and solvated phases relative to partitioning at ambient pressure. The new methods and devices disclos...	08/14/2001
6166232	Process for producing ester quats A process is described for producing ester quats of the formula (I) ##STR1## where X- is an anion of an inorganic or organic acid, Ra is a C1 to C4 alkyl group, Rb and Rc are each, in...	12/26/2000
6111096	Nucleic acid isolation and purification The invention is based on the discovery that hyperbaric, hydrostatic pressure reversibly alters the partitioning of nucleic acids between certain adsorbed and solvated phases relative to partitioning at ambient pressure. The new methods and devices disclo...	08/29/2000
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
5900125	Continuous preparation of alkyl esters of (meth)acrylic acid and apparatus for this purpose In a process and an apparatus for the continuous preparation of alkyl esters of (meth)acrylic acid by reacting (meth)acrylic acid and monohydric alkanols of 1 to 8 carbon atoms in the homogeneous, liquid, solvent-free phase at elevated temperatures and in...	05/04/1999
5693190	Recovery of glycols from used antifreeze compositions by distillation A method for the recovery of glycols from used antifreeze compositions by distillation entails the used antifreeze composition being treated before and/or during its distillation with an effective amount of sulfamic acid....	12/02/1997
5637777	Process and apparatus for preparing tertiary alkyl ether The invention concerns a process and an apparatus for preparing tertiary ethers. According to the process, C4 to C6 isoolefins and possibly heavier olefins contained in the feedstock are reacted with lower aliphatic alcohols, in part...	06/10/1997
5635035	Surface improved tower packing Etching the surfaces of a metal tower packing improves their wettability and therefore their efficiency in mass transfer applications....	06/03/1997
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
5587056	Separation of aliphatic diacids from adipic acid admixtures thereof At least a fraction of at least one branched, saturated aliphatic diacid having 6 carbon atoms, for example 2-methylglutaric acid and/or 2-ethylsuccinic acid and/or dimethylsuccinic acid, is separated from admixtures thereof with adipic acid, by at least ...	12/24/1996
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
5512691	Process for the production of tocopherol concentrates Disclosed is an improved process for the preparation of tocopherol concentrates from vegetable oil distillates. Tocopherol concentrates are obtained containing 20-80% tocopherol by weight, with an overall recovery of tocopherol of 72% to 97%. The process ...	04/30/1996
5458740	Process for the purification of crude caprolactam A process for the purification of caprolactam from crude caprolactam by distilling the crude caprolactam in the presence of an anorganic or organic acid....	10/17/1995
5346594	Process for the purification of 1,1-dichloro-1-fluoroethane A process for purification of crude, 1,1-dichloro-1-fluoroethane includes the steps of treating a mixture of crude, 1,1-dichloro-1-fluoroethane and hydrogen fluoride with chlorine in the presence of a Lewis acid, and distilling to recover purified 1,1-dic...	09/13/1994
5342487	Distillation process A process for reducing the amount of unwanted di(meth)acrylate produced during the distillation of hydroxyalkyl acrylates or hydroxyalkyl methacrylates....	08/30/1994
5316627	Process for producing odorless dimethyl ether This invention relates to a process for producing odourless dimethyl ether (DME) which is thus an excellent propellant. This dimethyl ether is produced from methanol, the methanol feed, prior to the reaction to form dimethyl ether, and/or the dimethyl eth...	05/31/1994
5300198	Process for the separation of ethylidene diacetate from acetic anhydride A distillation process for the separation of acetic anhydride from a mixture thereof with ethylidene diacetate wherein the mixture of acetic anhydride and ethylidene diacetate is fed to the mid section of a distillation column and a small amount of acetic...	04/05/1994
5284987	Preparation of a dimethyltetralin in a distillation reactor A method for the acid catalyzed cyclization of an alkenylbenzene feedstock to a dimethyltetralin in a liquid phase reaction wherein the desired dimethyltetralin is removed from the reaction mixture by distillation simultaneously with the addition of the f...	02/08/1994
5264084	Process for separating off alkenes during methylchlorosilane distillation A process for separating alkenes from a methylchlorosilane mixture by adding at least a stoichiometric amount of hydrogen chloride necessary for saturating the alkenes in the methylchlorosilane mixture and thereafter removing resulting chloroalkanes by di...	11/23/1993
5250155	Process for refining soap-containing crude polyol fatty-acid polyester reaction products A process for refining soap-containing crude polyol fatty-acid polyester reaction product, the process including one or more high-temperature refining treatments and as the first step in the refining process, contacting the crude reaction product with an ...	10/05/1993
5227028	Process for treating amides A process of treating a ketoxime or aldoxime-containing amide mixture resulting from a Beckmann rearrangement of the corresponding ketoxime or aldoxime. The process involves hydrolysis of the mixture to remove the remaining ketoxime or aldoxime which are ...	07/13/1993
5225049	Process for refining organic-solvent containing crude polyol fatty-acid polyester products A process for refining organic-solvent containing crude polyol fatty-acid polyester reaction product, including the steps of distilling the crude reaction product to substantially remove the organic solvent, and subsequently subjecting the distilled react...	07/06/1993
5194122	Method for recovering volatile, organic compounds from manure A method for recovering volatile, organic compounds from manure, by: i) acidifying and concentrating the manure; ii) condensing the formed vapor; and iii) separating the volatile, organic compounds from the condensate. Preferably the volatile, organic compounds are remo...	03/16/1993
5190618	Production of high concentration tocopherols and tocotrienols from palm-oil by-products A process for the production of tocopherols (T) and tocotrienols (T3) from palm fatty acid distillates (PFAD). The process includes converting free fatty acids and glycerides in PFAD into alkyl esters, then separating T and T3 from the alkyl esters and ot...	03/02/1993
5094720	Process for the distillative purification of citral A method is disclosed for enhancing the purification of citral by fractional distillation by inhibiting the formation of isocitrals from isomerization of citral during the distillation process. The method involves reducing the pH of a mixture containing c...	03/10/1992
5064507	Distillation process for recovery of high purity phenol High purity phenol is obtained from cleavage of cumene hydroperoxide by treating the crude phenol product stream in a first treatment zone with an amine, a coarse distillation to obtain an overhead stream comprising phenol, alpha-methyl styrene, cumene, a...	11/12/1991

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Class 203/34 - Acid