Class 203/45 - And distilling raffinate phase

Subclass of Class 203 - Distillation: processes, separatory
Definition: Processes directed to distilling the distillate after it
No. of patents: 29
Last issue date: 02/24/2004

Number	Title	Issue Date
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
6514387	Rectifying column for extractive distillation of close-boiling or azeotropic boiling mixtures The invention relates to a rectifying column for extractive distillation, comprising a column main section (204) and a raffinate section (205) above said main section, an evaporator (208) situated on the lower end of the column, an inlet (214) disposed be...	02/04/2003
6294055	Process for the separation of hydrogen fluoride from its mixtures with a hydrofluoroalkane containing from 3 to 6 carbon atoms Process for the separation of hydrogen fluoride from its mixtures with a hydrofluoroalkane containing from 3 to 6 carbon atoms, by extraction using an organic solvent....	09/25/2001
6210583	Spent caustic pretreatment and enhanced oxidation process A process for pre-treating a spent caustic stream prior to oxidation which includes countercurrent multi-stage elevated temperature solvent extraction of dissolved organic material from the spent caustic using a solvent to yield a spent caustic raffinate ...	04/03/2001
6096673	Catalyst recovery in the production of 2,5-dihydrofuran by isomerization of vinyl oxirane An improved process is provided for the recovery of catalyst components from oligomeric impurities which are formed during the industrial preparation of 2,5-dihydrofuran by the catalytic isomerization of vinyl oxirane followed by an essential separation o...	08/01/2000
5908964	Process for preparing alkyl ethers and mixtures thereof The invention concerns a process for preparing a tertiary alkyl ether product. The process comprises reacting the isoolefins of an olefinic hydrocarbon feedstock in a reaction zone (1-3) with an alkanol to form a reaction mixture, which is subjected to di...	06/01/1999
5885422	Spent caustic (pre)treatment process A process for pretreating a spent caustic stream prior to oxidation includes countercurrent multi-stage elevated temperature solvent extraction of dissolved organic material from the spent caustic using a solvent to yield a spent caustic raffinate contain...	03/23/1999
5811597	Method for the manufacture of methyl tertiary butyl ether from tertiary butyl alcohol and methanol Methyl tertiary butyl ether is prepared from contaminated TBA by reactively distilling the contaminated TBA in a reactive distillation column to provide a lower boiling isobutylene fraction and a higher boiling aqueous TBA fraction, by distilling the high...	09/22/1998
5628880	Etherification--hydrogenation process A process for removing dienes from etherification uses a hydrogenation zone in the reactor distillation column above the etherification zone. MTBE is produced and the unreacted C4 stream is also subjected to selective hydrogenation of the butad...	05/13/1997
5565068	Energy conservation during plural stage distillation In the multistage distillation of a methyl tertiary butyl ether reaction product comprising methyl tertiary butyl ether, tertiary butyl alcohol, methanol, isobutylene and water, the methyl tertiary butyl ether reaction product is separated in a primary me...	10/15/1996
5447607	Ether recovery Process equipment is provided for separating ether, alcohol and hydrocarbon components from various etherifications of C4 or C5 isoolefins with an alcohol such as methanol or ethanol, and wherein identical process vessels are utilize...	09/05/1995
5127997	Purification of propylene oxide by liquid extraction Purified propylene oxide is recovered from an impure propylene oxide feedstock contaminated with more than 50 ppm of six carbon atom hydrocarbon impurities by a solvent extraction process wherein: an impure propylene oxide feedstock is charged to a liquid/liqu...	07/07/1992
5078974	Apparatus for making alkali-metal tetraorganylborates Apparatus for the manufacture and recovery of alkali-metal tetraorganylborates. A mixed solvent and liquid/liquid contactor configuration is used in the system which aids in the recovery of the product....	01/07/1992
4997547	Method for the production of an aromate concentrate suitable for use as blending component for fuel In the method for the production of an aromate concentrate suitable for use as blending component for gasifier fuel, feed hydrocarbon mixtures having boiling ranges substantially between 40° and 170° C., are subjected, without any previous separation in...	03/05/1991
4851086	Production of high purity phenol by steam distillation Crude phenol, containing AMS by-product, and MBF impurity, is distilled in the presence of water to separate MBF impurity....	07/25/1989
4740273	Process for the purification of diethoxymethane from a mixture with ethanol and water A process for purifying diethoxymethane from a mixture containing ethanol and, optionally, water. The process involves the addition of an amount of water, DEM, or an appropriate mixture of any two or three of water, DEM and ethanol that is effective in mo...	04/26/1988
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
4556461	Process for separating highly pure butene-1 or butene-1/isobutene mixture from C₄ hydrocarbon fraction A process for separating a butene-1/isobutene mixture from a C4 hydrocarbon fraction is provided which comprises subjecting the C4 hydrocarbon fraction to extractive distillation using a polar solvent to separate components predomina...	12/03/1985
4555312	Process for separating highly pure butene-1 or butene-1/isobutene mixture from C₄ hydrocarbon fraction A process for separating a butene-1/isobutene mixture from a C4 hydrocarbon fraction is provided which comprises subjecting the C4 hydrocarbon fraction to extractive distillation using a polar solvent to separate components predomina...	11/26/1985
4513153	Integrated process for producing tert.butyl alkyl ethers and butene-1 Tert.butyl alkyl ethers are produced from a C4 hydrocarbon feedstock containing isobutene, and the butene-1 is recovered at high purity by extractive distillation of the isobutene-free C4 hydrocarbon stream in the presence of a solve...	04/23/1985
4504364	Phenol purification In the production of high purity phenol, a water-phenol mixture recovered from the top of a distillation column is contacted with a water immiscible solvent to extract methyl benzofuran and other by-products and impurities in phenol production therefrom, ...	03/12/1985
4382843	Method for producing gasoline-alcohol fuels A process for producing gasoline-ethanol blends comprises purifying dilute ethanol by extractive distillation and concentrating the ethanol by distillation followed by one or both of the following steps: (a) liquid extraction of ethanol into heated gasoli...	05/10/1983
4349418	Production of methylnaphthalenes and tar bases including indole Methylnaphthalenes, indole and other tar bases are recovered from a base-extracted coal tar distillation fraction. In one form, an aqueous salt solution of pH 0.5-3 extracts other tar bases from the starting material, and thereafter both products are reco...	09/14/1982
4298765	Purification of phenol with reduced energy consumption Phenol (10) produced by the cleavage of cumene hydroperoxide is chemically treated with a base (12) such as a polyamine, is optionally then treated with an acid or acid anhydride (15) such as phthalic anhydride, is then steamed distilled (12) to remove a ...	11/03/1981
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
4070254	Process for preparing a purified methacrylic acid ester A process for preparing a purified methacrylic acid ester from a crude methacrylic acid ester containing an isobutyric acid ester as an impurity, comprising the steps of azeotropically distilling the crude methacrylic acid ester in the presence of water t...	01/24/1978
4049723	Method for separation and recovering hydroquinone A method for separating and recovering hydroquinone which comprises distilling a by-product-containing acid-cleavage product, which is obtained by acid-cleavage of an oxidation product of para-diisopropyl benzene in a solvent, in the presence of an aromat...	09/20/1977
4038156	Butadiene recovery process An improvement is described on a process for recovery of butadiene from a C4 hydrocarbon mixture additionally containing minor amounts of C5 saturated and unsaturated hydrocarbons, said hydrocarbon mixture being obtained as the overh...	07/26/1977
3940450	Preparation and recovery of ethers Methyl tertiary butyl ether may be recovered from etherification reaction effluent by azeotropic distillation to recover methanol-ether azeotrope overhead which latter is azeotropically distilled in the presence of n-pentane to give pure ether bottoms sub...	02/24/1976

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Class 203/45 - And distilling raffinate phase