Class 203/16 - Acetic

Subclass of Class 203 - Distillation: processes, separatory
Definition: Processes in which the organic acid is acetic acid.
No. of patents: 40
Last issue date: 05/23/2006

Number	Title	Issue Date
7048835	System and method for acetic acid recovery during terephthalic acid production A distillation system and method for recovering acetic acid from a feed stream containing acetic acid and water stream generated during terephthalic acid production. The invention includes a dehydration column utilizing azeotropic distillation to recover the acetic ...	05/23/2006
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
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
6793777	Method for separating and purifying an aqueous mixture that mainly consists of acetic acid and formic acid The invention relates to a method for separating and purifying an aqueous mixture that mainly consists of acetic acid, formic acid and high-boiling substances by extraction with a solvent in a cyclic process. The inventive method is characterized in that the flow of...	09/21/2004
6695952	Method for the separation of and purification of an aqueous mixture consisting of the main components acetic acid and formic acid A method for the separation and purification of an aqueous mixture of main components, namely acetic acid and formic acid and non-volatiles by extraction, uses a solvent in a circulatory system. A raffinate stream is mixed with the larger proportion of wa...	02/24/2004
6417128	Methods and replacing water and cyclohexanone with acetic acid in aqueous solutions of catalyst This invention relates to methods of replacing water and cyclohexanone with acetic acid in an aqueous solution of catalyst, preferably a cobalt compound. Such an aqueous solution is produced by extracting catalyst with water from a cyclohexanone/water sol...	07/09/2002
5980696	Dehydration of acetic acid by azeotropic distillation in the production of an aromatic acid An improved process for preparing an aromatic dicarboxylic acid wherein the improvement resides in dehydrating and recovering solvent from a feed stream having from 20% to 40% by weight water via azeotropic distillation with organic phase reflux using an ...	11/09/1999
5932182	Reactor for high temperature, elevated pressure, corrosive reactions Reactor for containing high pressure, high temperature, corrosive reactions, especially supercritical water reactions. The reactor comprises an inner reactor vessel which houses the corrosive reaction, an outer containment vessel which contains a substant...	08/03/1999
5916422	Method of purifying acetic acid A method for purifying acetic acid containing at least one component selected from the group consisting of unsaturated compounds and carbonyl compounds as an impurity involves the step of purifying the acetic acid with a distillation column having at leas...	06/29/1999
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
5492625	Method of recovering carboxylic acids from dilute solutions A method for recovering carboxylic acids from a dilute aqueous solution thereof having a concentration below about ten percent (10%) by weight, which includes passing the dilute acid solution through a reverse osmosis separator, thereby producing a permea...	02/20/1996
5492603	Apparatus for recovering acetic acid from aqueous streams Disclosed is a method and apparatus for recovering acetic acid from an acetic acid/water waste stream which includes a dehydration column into which the stream is fed and a liquid-liquid extraction system for recovering acetic acid from the condensate of ...	02/20/1996
5409579	Method for recovering acetic acid from aqueous streams Disclosed is a method and apparatus for recovering acetic acid from an acetic acid/water waste stream which includes a dehydration column into which the stream is fed and a liquid-liquid extraction system for recovering acetic acid from the condensate of ...	04/25/1995
5399751	Method for recovering carboxylic acids from aqueous solutions Disclosed is a method for recovering carboxylic acids having from one to ten carbon atoms, and particularly formic acid, acetic acid and mixtures of formic and acetic acids, from aqueous solutions, in which the aqueous solution is contacted with solvent c...	03/21/1995
5167774	Dehydration of acetic acid by extractive distillation Acetic acid cannot be easily removed from acetic acid - water mixtures by distillaton because of the closeness of their boiling points and the deviation from ideal solution behavior. Acetic acid can be readily removed from the mixtures containing it and w...	12/01/1992
5160412	Dehydration of acetic acid by azeotropic distillation Acetic acid is difficult to separate from water by conventional distillation or rectification because of the close proximity of their boiling points. Acetic acid can be readily separated from water by using azeotropic distillation. Typical examples of eff...	11/03/1992
5073267	Process for the extraction of volatile compounds with supercritical carbon dioxide, and compounds obtained In this process a percolation of supercritical gas through the starting material is conducted, the carbon dioxide loading with extractable compounds, then, when the percolation pressure reaches a predetermined value, the percolation medium is let down, fe...	12/17/1991
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
4964995	Supercritical separation process for complex organic mixtures A process is disclosed for separating low molecular weight components from complex aqueous organic mixtures. The process includes preparing a separation solution of supercritical carbon dioxide with an effective amount of an entrainer to modify the solvat...	10/23/1990
4898644	Removal of volatile acids from aqueous solutions A process for removing volatile acids from aqueous solutions which involves steam stripping a volatile acid from an aqueous solution and contacting the vaporized acid with a reactable cation to form a salt of the acid. A preferred embodiment of apparatus ...	02/06/1990
4883912	Process for the recovery of acetic acid In a process for the recovery of acetic acid by extracting acetic acid from an aqueous acetic acid solution containing a metallic salt of sulfuric acid with an organic extractant comprising a tertiary amine and an organic diluent and recovering acetic aci...	11/28/1989
4770780	Liquid CO₂ /cosolvent extraction Disclosed are a fluid extractant, and a process and apparatus for using the extractant to separate an organic liquid from an aqueous mixture. The extractant comprises a first fluid solvent which is a gas in its near-critical or supercritical state and a c...	09/13/1988
4729818	Dehydration of acetic acid by extractive distillation Acetic acid cannot be easily removed from acetic acid--water mixtures by distillation because of the closeness of their boiling points and the deviation from ideal solution behavior. Acetic acid can be readily removed from mixtures containing it and water...	03/08/1988
4582570	Azeotropic dehydration distillation process Improvement in an azeotropic distillation process, the improvement being the use of an entrainer characterized in that it is an organic compound in which one or more hydrogen atoms are replaced by halogen atoms, including at least one fluorine atom; it is...	04/15/1986
4576683	Method for separating carboxylic acids from mixtures with non-acids A method for separating carboxylic acids from mixtures with non-acids by an extractive distillation method using a lactam with a 5- or 6-membered ring, preferably N-methyl-2-pyrrolidone, as an extractant to extract the acids from the mixture with non-acid...	03/18/1986
4405717	Recovery of acetic acid from a fermentation broth A process is provided for the recovery of acetic acid from dilute aqueous solutions. The acid in the form of its calcium salt is treated with a tertiary amine carbonate and the resulting trialkylammonium acetate is isolated and heated to give the acetic a...	09/20/1983
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
4365080	Production of dimethyl esters This invention provides an improved process for the separation and recovery of byproducts associated with the isolation of C4 -C6 dicarboxylic acids contained in a waste byproduct stream derived from an adipic acid manufacturing oper...	12/21/1982
4353784	Method of recovery of acetic acid Disclosed is a method of recovering acetic acid by extracting from an acetic acid-containing aqueous solution with an organic extracting agent and subjecting the extract to distillation, said method comprising the first step of performing extraction by us...	10/12/1982
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
4230887	Recovery of anhydrous acids C2 -C6 monocarboxylic and dicarboxylic acids are scrubbed from gas phase mixtures of such acids and water by gas absorption techniques utilizing a liquid solvent comprising a polyoxyalkylene glycol or a monoalkyl or dialkyl ether the...	10/28/1980
4229261	Process for separating water from organic multiple component mixtures by distillation Water is separated by distillation from organic multiple component mixtures containing at least one component partly miscible with water. The component miscible with water is distilled azeotropically with the water contained in the mixture, the distillate...	10/21/1980
4166774	Acrylic acid recovery and purification The separation of acrylic acid from a mixture of acrylic acid and acetic acid found in the reaction product stream obtained in the process of producing acrylic acid by the oxidation of propylene or acrolein is improved by removing a vapor sidestream from ...	09/04/1979
4143066	Separation and recovery of carboxylic acids from water A lower carboxylic acid such as acetic acid is separated and recovered from an aqueous medium by the steps which include contacting, in an extraction zone, the aqueous medium with an extracting agent such as trioctyl phosphine oxide dissolved in an organi...	03/06/1979
4039395	Purification of acetic acid A process is provided for purification and drying of acetic acid containing water and methyl iodide and hydrogen iodide as contaminants. The process comprises distillation in a two-zone system wherein the major part of the methyl iodide and hydrogen iodid...	08/02/1977
4008131	Purification of acetic acid A method is provided for removal of excess water which tends to build up in recycle streams and reduces the rate of pure acid production during operation of a distillation system for purification of crude acetic acid containing water and methyl iodide. Th...	02/15/1977
3951755	Process for preparing technically pure acetic acid by extractive distillation Process for preparing technically pure acetic acid from water - acetic acid mixtures by extractive distillation with N-methyl acetamide....	04/20/1976

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Class 203/16 - Acetic