Class 203/17 - Aldehyde or ketone

Subclass of Class 203 - Distillation: processes, separatory
Definition: Processes in which the organic substance is an aldehyde
No. of patents: 31
Last issue date: 10/13/2009

Number	Title	Issue Date
7601245	Process for reducing the aldehyde concentration in a mixture comprising cyclohexanone and one or more aldehydes The invention relates to a process for reducing the aldehyde concentration in a mixture comprising cyclohexanone and one or more aldehydes, said process comprising distilling said mixture in a distillation column in the presence of an alkaline compound, wherein in t...	10/13/2009
7531066	Method for the purification of acrolein A process for purifying an aqueous solution to obtain purified gaseous acrolein by introducing the aqueous solution into a distillation column equipped at its base with at least one boiler and at its top with at least one condenser, withdrawing a liquid mixture esse...	05/12/2009
7435318	Ionic liquids as selective additives for separation of close-boiling or azeotropic mixtures The invention relates to a process for separating close-boiling, homo- and heteroazeotropic mixtures by using ionic liquids. Due to the selectivity and unusual combination of properties of the ionic liquids the process is superior to conventional extractive rectific...	10/14/2008
7338579	Dewatering process A formaldehyde-containing product is separated from a formalin solution containing formaldehyde, water, and methanol by distilling in the presence of a water entraining compound, especially methyl propionate or methyl methacrylate. The product contains substantially...	03/04/2008
7262330	Process of producing aldehydes A process of producing aldehydes in a continuous hydroformylation process of continuously reacting an olefinic unsaturated compound with carbon monoxide and hydrogen in the presence of a rhodium-phosphite based complex catalyst and continuously separating at least o...	08/28/2007
6955743	Method for producing furfural, acetic acid and formic acid from spent pulp-cooking liquor The invention relates to a process for recovering and producing chemicals in a pulp production process where organic chemicals, such as formic acid and acetic acid, are used as cooking chemicals. The process of the invention is based on regeneration of cooking acids...	10/18/2005
6946060	Purification of N,N-dimethylacetamide A method to purify N,N-dimethylacetamide (DMAc) from an aqueous solution containing acetic acid as a contaminant. Two fractional distillation columns are arranged in a series. The solution containing the contaminant is provided to the first column with a temperature...	09/20/2005
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
6737557	Hydrocarbon upgrading process A process for recovering DCPD from a hydrocarbon feedstock comprising introducing the hydrocarbon feedstock to a first column, recovering an overhead stream from the first column comprising C9− hydrocarbons, recovering a bottom stream from the first col...	05/18/2004
6478929	Dewatering process A formaldehyde-containing product is separated from a formalin solution containing formaldehyde, water and methanol by distilling the solution in the presence of a water entraining compound, especially methyl propionate or methyl methacrylate. The product...	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
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
5695615	Purification process for cyclic formulas A purification process for cyclic formals, in which water is efficiently removed from a crude cyclic formal, namely, a mixture of a cyclic formal and water which is difficult to be separated from the mixture, thereby obtaining a cyclic formal of high puri...	12/09/1997
5690793	Purification process for cyclic formals A purification process for cyclic formals, in which water is efficiently removed from a crude cyclic formal, namely, a mixture of a cyclic formal and water which is difficult to be separated from the mixture, thereby obtaining a cyclic formal of high puri...	11/25/1997
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
5603813	Purifying distillation of vinyl formate Vinyl formate containing formic acid, acetaldehyde and water following synthesis is separated from formic acid and water in a first distillation stage and from acetaldehyde in a second stage to give pure vinyl formate....	02/18/1997
5558747	Process for azeotropic distillation of aqueous chloral mixtures An improved process for azeotropic distillation of chloral to anhydrous chloral containing as little as 0.1% water. An azeotropic mixture is used which contains chloral in at least a 1.4:1 ratio with the concentration (% of weight) of a azeotropic agent (...	09/24/1996
5456805	Purification process for cyclic formals A purification process for cyclic formals, in which water is efficiently removed from a mixture of a cyclic formal and water which is difficult to be separated from the mixture, thereby obtaining a cyclic formal of high purity which contains only an extre...	10/10/1995
5447620	Method of dehydrating the solvent resulting from a process step of dewaxing hydrocarbons A method of dehydrating a solvent originating from a hydrocarbon dewaxing operation, wherein a moist composite organic solvent, for example a moist MEK/toluene mixture is dehydrated in a first distillation zone, the resulting first distillate is contacted...	09/05/1995
5059327	Cross-linked separation membrane and process for pervaporation A preparation membrane for pervaporation which comprises a crosslinked reaction mixture of a polyvinyl alcohol or polyvinyl alcohol copolymer and a polystyrene sulfonic acid or polystyrene sulfonic acid copolymer. A method for separating a mixture of wate...	10/22/1991
4978430	Method for dehydration and concentration of aqueous solution containing organic compound An improved method for dehydration and concentration of an aqueous solution containing an organic compound is disclosed. The solution is evaporated to produce a gaseous mixture comprising an organic compound vapor and a water vapor. The water vapor is sel...	12/18/1990
4952318	Separations of oxygenates A dilute solution of methyl ethyl ketone is concentrated by pervaporation through a fluorinated ion exchange membrane which has been exchanged with a quaternary ammonium cation....	08/28/1990
4946561	Process for obtaining trioxane from aqueous solutions by high-pressure extraction The invention relates to a process for obtaining trioxane from aqueous solutions by high-pressure extraction using an extracting agent which is in the form either of a gas in the supercritical state or of a liquid gas. An intermediate separation is advant...	08/07/1990
4875980	Method for separating and concentrating an organic component from an aqueous solution containing same Disclosed is a method for separating and concentrating an organic component having a lower boiling point than water from an aqueous solution containing the organic component which comprises the steps of (1) bringing an aqueous solution containing an organ...	10/24/1989
4577043	Process for the preparation of aldehydes The preparation of aldehydes by the reaction of olefins with carbon monoxide and hydrogen in the presence of water and water-soluble rhodium/phosphine complex compounds as catalysts. The method comprises first cooling the organic part of the liquid phase ...	03/18/1986
4559110	Acetophenone recovery and purification Distillation of the heavy waste stream from the manufacture of phenol via the cumene process provides an overhead stream containing phenol, acetophenone and 2-phenyl propionaldehyde. Extraction of the overhead stream with aqueous caustic removes the pheno...	12/17/1985
4493752	Process for recovering trioxane by plural distillation A process for recovering trioxane from an aqueous solution containing trioxane and triethylamine by the distillation separation process which comprises feeding an aqueous solution containing trioxane and triethylamine to the first distillation column, dis...	01/15/1985
4401514	Method for the recovery of furfural, acetic acid and formic acid A method of recovering or extracting chemicals, such as furfural, formic acid, acetic acid and other organic compounds from acidic hydrolysates of plants or vegetable matter, especially spent sulfite liquors after conversion of the pentosans into pentoses...	08/30/1983
4349415	Process for separating organic liquid solutes from their solvent mixtures Process and apparatus for extracting an organic liquid from an organic liquid solute/solvent mixture. The mixture is contacted with a fluid extractant which is at a temperature and pressure to render the extractant a solvent for the solute but not for the...	09/14/1982
4186059	Dehydration of solvent used in oil dewaxing-deoiling processes A process for dehydrating an essentially one-phase wet solvent stream obtained in a solvent dewaxing-solvent deoiling process, which solvent stream contains at least 60% toluene with the balance being water and methyl ethyl ketone (hereinafter MEK), is de...	01/29/1980
4000044	Fractionation of immiscible liquids of equal density Separation by distillation and formation of immiscible liquid phases of nearly equal densities which comprises distilling a mixture containing the same in the presence of an added liquid of substantially different density, preferentially soluble in a recy...	12/28/1976

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Class 203/17 - Aldehyde or ketone