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7594979 |
Purification of propylene oxide resulting from epoxidation of propylene with hydrogen peroxide
A process of separating a purified propylene oxide from a crude epoxidation product produced, preferably, in an epoxidation reaction of propylene with hydrogen peroxide. The process involves...
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7074971 |
Recovery of ethylene and propylene from a methanol to olefin reaction system
The present invention provides new highly-efficient separation processes and systems for separating polymerization-grade ethylene and propylene from an initial effluent stream comprising ethane,...
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6500311 |
Propylene oxide purification
A mixture of propylene oxide and methanol is separated by liquid/liquid extraction using water and a hydrocarbon such as n-octane as extractive solvents.
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6299734 |
Preparation of an aqueous solution of free hydroxylamine
An aqueous solution of free hydroxylamine is prepared by treating a hydroxylammonium salt with ammonia by the countercurrent method in a stripping column by a process in which hydroxylamine is...
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6214172 |
Preparation of methylglyoxal dimethyl acetal
In a process for the preparation of methylglyoxal dimethyl acetal from methylglyoxal and methanol in the presence of an acidic ion exchanger, water is introduced in an amount sufficient to form an...
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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...
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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...
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5866721 |
Process for separating the product gas mixture from the catalytic synthesis of methyl mercaptan
A process for separating the product gas mixture from the catalytic synthesis of methyl mercaptan. Because of improved separation of the product gas mixture into its components, less hydrogen...
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5779861 |
Method for treating process condensate
An apparatus and method for treating chemical production plant process condensate and low pressure purge gas such that a contaminant-rich stream is recoverable from the condensate and purge gas,...
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5718810 |
Methanol recovery using extractive distillation
A method for recovering methanol from sulfur-based wood pulping process vapors, which contain at least methanol and dimethyl disulfide. The method involves three steps. The first step consists of...
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5626724 |
Recovery of N-ethylpiperazine by distillation
In a process for the recovery of N-ethylpiperazine by distillation from mixtures with N,N'-diethylpiperazine, piperazine, ethanol, water and accompanying substances, water is added in a manner such...
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5587047 |
Method for separating boric acid
A method for separating boric acid from a liquid, especially liquid waste obtained from a nuclear power plant. In the method, the waste solution containing the boric acid is contacted with steam in...
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5529667 |
Process for recovering ethylene oxide
In an improved process for recovering ethylene oxide from an aqueous ethylene oxide solution further containing formaldehyde is provided wherein the impure aqueous ethylene oxide solution is...
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5385646 |
Method of treating chemical process effluent
An apparatus and method for treating chemical production plant process condensate such that a contaminant-rich stream and a relatively pure aqueous stream is separately recoverable from the...
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5348624 |
Process for separating ethyl tert-butyl ether and ethanol
For separating ETBE and ethanol the following principal stages are employed: (1) Extraction of ethanol by water, the raffinate being ETBE saturated in water and the extract an ethanol/water mixture...
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5264117 |
Distillation of hydrocarbons
Where side stream distillate strippers are used in the distillation of hydrocarbons, the required size of the distillation column and the amount of stripping gas or vapor required are reduced by...
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5250156 |
Method of separating ethyl tertiobutyl ether from mixtures with ethanol
The separation of ethyl tertiobutyl ether from mixtures with ethanol is based on heteroazeotropic distillation with water as the entrainer using two distillation columns, coupled with an overhead...
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5167773 |
Distillation tower and sidestream stripper therefor
A distillation tower (1) has a plurality of liquid sidestream lines (5, 6, 7) and a multi-stage sidestream stripper (13) which includes a respective stripping section (14, 15, 16) for each...
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5131984 |
High quality phenol rectification with energy recovery
The process for rectification of phenol prepared from crude phenol being the product of decomposition of cumene hydroperoxide and having previously been distilled to remove large portions of...
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5028735 |
Purification and preparation processes for methyl methacrylate
A purification process for methyl methacrylate (MMA) and a recovery process for methanol are disclosed. A mixture, which contains water, methanol and methyl methacrylate (MMA) as principal...
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4966657 |
Process for separating ethylene oxide from aldehyde impurities by distillation
An improved process for separating ethylene-oxide from formaldehyde and acetaldehyde in contaminated ethylene oxide, the process involves introducing the contaminated ethylene oxide into a reflux...
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4652343 |
Process for the separation of mixtures of paraffin or respectively paraffins of 6-14 carbon atoms and alcohol or respectively alcohols of 4-8
The separation of homozeotropic mixtures of a paraffin or paraffins of 6-14 carbon atoms and an alcohol or alcohols of 4-8 carbon atoms is conducted in two rectification steps. In a first step,...
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4595461 |
Process for the non-degenerative distillation of fatty acids
A process for the nondegenerative distillation of C 6 -C 24 -fatty acids, of the type obtained by splitting natural fats and oils or by synthetic processes, such as for example the oxidation of...
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4566947 |
Method of separating a mixed liquid into light and heavy fractions by distillation
A two-stage distillation method for separating a mixed liquid such as a dimethylformamide-containing aqueous liquid or a methanol-containing aqueous liquid, into light and heavy fractions. The...
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4522920 |
Production of ethanol
A flow of fermenting liquor from a fermentor is separated into a yeast concentrate flow, which is recirculated to the fermentor, and a yeast-free flow which is separated in a simple evaporator unit...
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4468257 |
Washing and removal method of high molecular substances
Method of adding water and a hydroxide of an alkali metal or alkaline earth metal to a washing solvent such as an alkylamide and/or alkylsulfoxide when washing and removing high molecular...
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4448644 |
Method of producing ethanol-water azeotrope from crude ethanol
This invention relates to a process for purifying crude ethanol, whether produced by fermentation or by the synthetic route, to produce a pure ethanol-water azeotrope. The process uses only two...
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4436902 |
Removal of contaminants in liquid purification
A liquid containing a contaminant such as water or polymeric solids is purified. Purification of a liquid containing a contaminant is enhanced by the use of second fractionating column in...
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4360406 |
Process for the preparation of tertiary butyl alcohol
Provided is a process for preparing tertiary butyl alcohol from isobutylene comprising reacting isobutylene or a hydrocarbon mixture containing isobutylene with an aqueous solution of an aliphatic...
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4347385 |
Process for the separation of sulfur compounds from water
Sulfur compounds are separated from aqueous mixtures containing same by employing a stripper having at least two stripping sections with at least a portion of the stripper kettle product being...
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4309254 |
Alcohol recovery process
A process for the production of alcohol from a fermented feed wherein insoluble organic matter is separated prior to entry into a first distillation column. The insoluble organic matter is dried...
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4308109 |
Method of producing ethanol-water azeotrope from crude ethanol
Process for purifying crude ethanol, whether produced by fermentation or by the synthetic route, to produce a pure ethanol-water azeotrope. The process uses only two distillation columns for...
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4302298 |
Process for isolating methyl tert-butyl ether from the reaction products of methanol with a C.sub.4 hydrocarbon cut containing isobutene
Process for isolating methyl tert-butyl ether contained in the reaction product of methanol with a C 4 hydrocarbon cut containing isobutene, comprising fractionating said reaction product by...
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4269667 |
Acrylonitrile purification by extractive distillation
A method for purifying acrylonitrile resulting in capital and operating cost savings consists of distilling a solution of acrylonitrile and impurities in a distillation column under vacuum, and...
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4233281 |
Recovery of hydrogen fluoride from metallic fluoride salts
Anhydrous hydrogen fluoride of high purity can be recovered from metallic fluoride salts containing phosphate values by digesting the metallic salts in an aqueous solution in a humid atmosphere at...
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4009230 |
Device for vacuum treatment of liquids by means of a gaseous strip-medium
Oil or fat is deodorized by contacting with steam. The oil or fat is finely distributed in a vacuum contact zone by spray means whereupon it contacts a steam vapor. The contacted oil or fat is then...
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3956074 |
Recovery of methylglyoxal acetal by plural stage distillation with intermediate phase separation
A process for the recovery of methylglyoxal acetal from a reaction mixture which has been obtained in the reaction of acetone with an alcohol and a nitrosation agent or oxidizing agent in the...
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3859175 |
PROCESS FOR PURIFYING ACRYLIC ACID BY PLURAL STAGE DISTILLATION AND AN EXTRACTION
Acrylic acid is purified from an aequeous solution containing acrylic acid and acetic acid, by distilling azeotropically with a dual solvent consisting of the first component capable of forming an...
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3658659 |
SEPARATING P-DICHLOROBENZENE FROM N-METHYL PYRROLIDONE BY STEAM DISTILLATION
A process for the recovery of p-dichlorobenzene and N-methylpyrrolidone from the reactor effluent from the production of polyphenylene sulfide from which the polyphenylene sulfide has been...
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3625836 |
PURIFICATION OF ALKOXYACETONE FROM 1-ALKOXY-2-PROPANOL BY AZEOTROPIC DISTILLATION WITH WATER
A method for recovering alkoxyacetones from mixtures of alkoxyacetone and the corresponding 1-alkoxy-2-propanol by adding water to the mixture and distilling to form a lower boiling...
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3462347 |
SOLVENT PURIFICATION AND RECOVERY BY STRIPPING AND DISTILLATION
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3451900 |
ADIPONITRILE RECOVERY BY MULTISTAGE VACUUM DISTILLATION
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3448016 |
METHOD OF RECOVERING PURE SOLVENTS USED IN DEWAXING MINERAL OILS AND THE LIKE BY MULTISTAGE DISTILLATION OF SEPARATE SOLVENT STREAMS
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3433840 |
PROCESS FOR RECOVERING ACROLEIN BY QUENCHING,ABSORPTION AND PLURAL DISTILLATION
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3427230 |
SAPONIFICATION GLYCERINE REFINING BY PLURAL STAGE FLASH DISTILLATION WITH LIVE STEAM
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3418338 |
Water extractive distillation of an ethylene oxide stream containing formaldehyde
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3408273 |
Organic lead recovery from electrolytes by steam and azeotropic distillation
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3404072 |
Ammonia recovery from an acid gas in a plural stage, controlled distillation system
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3337424 |
Purification of m- and p-cresol by azeotropic distillation with a hydrocarbon entrainer
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3335070 |
Phenol purification by base addition and plural distillation
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