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7615137 |
Process for recovering caprolactam from aqueous caprolactam product using in situ prepared alkali amino caproate
A continuous process is provided for recovering caprolactam from aqueous caprolactam product which includes (i) caprolactam, (ii) impurities, and (iii) water by (a) adding alkali hydroxide to the...
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7575660 |
Process for the distillative separation of aqueous amine solutions
The invention relates to an energy efficient process for the distillative working-up of aqueous amine solutions that occur in the catalytic hydrogenation of nitroaromatic compounds. In this...
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7553397 |
Process
A process is described for the recovery of substantially pure ethyl acetate from a feedstock including ethyl acetate, ethanol and water. The process includes supplying the feedstock to a first...
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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...
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7435317 |
Desalination of ocean water
An improved distillation of water. involves distilling significant quantities of water at temperatures well below the boiling point. During distillation, a compound is taken from a liquid-phase to...
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7416644 |
Method and device for stripping ammonia from liquids
The present invention provides a method and a system for stripping volatile compounds such as ammonia from liquids. Part of the ammonia is stripped from the liquid in a system having a shunt...
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7410556 |
Purification of aqueous solutions of organic acids
The invention relates to a method and a device for the purification of an aqueous solution of an organic acid having a boiling point at atmospheric pressure of less than 450° C., which further has...
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7384518 |
Method for purifying lactams
A method and a plant are disclosed for purifying lactams, particularly lactams obtained by cyclizing hydrolysis of aminonitrile. The purification of ε-caprolactam obtained by cyclizing hydrolysis...
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7384501 |
Method for improved turpentine recovery from modern cooking plants
A method for the preparation of pulp by means of alkaline cooking, in which method spent liquor is transferred to pressurized tanks, and at least one liquor is expanded corresponding to a...
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7351311 |
Method for purifying tetrahydrofuran by distillation
Crude water-containing tetrahydrofuran is purified by passing the crude tetrahydrofuran through three distillation columns, withdrawing water from the bottom of the first column, recycling...
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7306705 |
Method for dehydrating composition comprising lithium bis(pentafluoroethanesulfonyl)imide
A method for dehydrating an aqueous composition comprising lithium bis(pentafluoroethanesulfonyl)imide and at least one organic solvent, wherein a part of solvent is distilled off by distillation.
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H002194 |
Purification of phenols
This invention relates to a process for the purification of phenols in a feedstock containing phenols and neutral oils and/or tar bases. The process includes liquid-liquid extraction of feedstock...
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7217343 |
Point of use water purification method and apparatus
A compact, energy efficient, continuous-flow point of use distillation system utilizes stacked, vertically-arranged components to provide a compact and energy efficient distillation process and a...
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7214294 |
Azeotrope-like compositions of pentafluoropropane and water
This invention provides azeotrope-like compositions of 1,1,1,3,3-pentafluoropropane and water that are environmentally desirable for use as refrigerants, aerosol propellants, metered dose inhalers,...
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7163606 |
Process for recovering methylene chloride
A system for recovering methylene chloride from an aqueous waste stream is disclosed. The system includes a distillation unit, at least one heat transfer unit, receptacles for methylene chloride...
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7108771 |
Method for removal of impurities in cyclic siloxanes useful as precursors for low dielectric constant thin films
A process for reducing the level(s) of water and/or other impurities from cyclosiloxanes by either azeotropic distillation, or by contacting the cyclosiloxane compositions with an adsorbent bed...
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7105078 |
Method for producing an aqueous hydroxylamine solution devoid of salt
A process for preparing a salt-free aqueous hydroxylamine solution by reacting an aqueous solution of a hydroxylammonium salt with a base to give a mixture and separating from said mixture by...
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7060865 |
Recovery of C4 olefins from a product stream comprising C4 olefins, dimethyl ether and C5+ hydrocarbons
Disclosed is a process for removing DME from a stream containing C4 olefins. The process includes providing a first stream comprising C4 olefins, C5+ hydrocarbons, DME, and methanol. The first...
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6986833 |
Process for fractionating water-containing crude amine mixtures from amine synthesis
An amine-containing mixture containing one or more amines, water, low-boilers and optionally high-boilers is fractionated by a process having the steps (iii) and (iv) and optionally the steps (i),...
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6984293 |
Azeotropic distillation of cyclic esters of hydroxy organic acids
Cyclic esters of hydroxy organic acids can be produced and recovered via azeotropic distillation. In certain embodiments cyclic esters, such as glycolide and lactide, can be produced from a...
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6962967 |
Method of purifying polyether polyols of non-volatile impurities
The subject invention provides polyurethane foam and a method of purifying polyether polyols of non-volatile impurities for use in forming the polyurethane foam. The method includes the step of...
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6942762 |
Method for the production of a salt-free aqueous hydroxylamine solution
A process for preparing a salt-free aqueous hydroxylamine solution by distilling an aqueous solution of a hydroxylammonium salt and a base in a tray column having at least two mechanical trays,...
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6860971 |
Process for recovery of olefinically unsaturated nitriles
A process is described for the recovery of acrylonitrile from an ammoxidation reactor effluent stream containing acrylonitrile, water, and organic impurities. The process includes the steps of (a)...
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6849162 |
Method for the production of propylene oxide
A process for the preparation of propylene oxide in the presence of methanol, in which propylene oxide is separated from a mixture propylene oxide and methanol, and the resultant methanol...
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6849161 |
Process for the production of anhydrous hydrazine and device for its implementation
The present invention relates to a process for preparing anhydrous hydrazine. The process can include distilling an unconcentrated aqueous hydrazine solution into a starting binary solution,...
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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...
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6821396 |
Process for fractionating water-containing crude amine mixtures from amine synthesis
A mixture containing mixture one or more amines, water, low-boilers and high-boilers, is fractioned in a process wherein (i) low-boilers are separated from the mixture by distillation, (ii)...
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6821382 |
Method and arrangement for cleaning contaminated condensate including a combined stripper/condenser
A method and apparatus for cleaning condensate, produced during the production of cellulose pulp, including evaporation of spent liquor, utilizing a cleaning plant having several condensers,...
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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...
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6733637 |
Process for producing ultra-high purity isopropanol
A process for producing high purity isopropyl alcohol. In one embodiment, the process includes the steps of: (a) feeding a feed stream comprising at least about 99.9 wt. % isopropyl alcohol into a...
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6692616 |
Method for purifying trimethylolpropane, which is produced by hydrogenation, by means of continuous distillation
A process is disclosed for the purification, by distillation, of trimethylolpropane originating from the hydrogenation of 2,2-dimethylolbutanal, said process including the following steps: (a)...
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6660169 |
Method and apparatus for reclaiming deicer from produced water of an oil well
A method and an apparatus for reclaiming deicer from produced water of an oil or gas well includes a fractionation tower having a top condenser section, a bottom heat exchanger section and an...
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6635151 |
Lactam dehydration method
The present invention relates to a process for separating the water from an aqueous lactam solution. It applies more particularly to a mixture resulting from the reaction between an aminonitrile...
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6500310 |
Process for the treatment of waste water
A process for treating waste water streams containing at least hydrocarbons and salts to yield a clean water product, a concentrated brine product and a hydrocarbon-rich product, which process...
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6494996 |
Process for removing water from aqueous methanol
A process for separating water from methanol in an aqueous methanol initial mixture, including subjecting said mixture to azeotropic distillation in the presence of sufficient added methyl acrylate...
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6461481 |
Process for removing water from organoborane compounds
A method of removing water from wet organoborane by dissolving the wet organoborane in an organic solvent in which water is incompletely soluble, decanting any insoluble water, and distilling the...
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6436243 |
Process for recovering N-vinyl-2-pyrrolidone
A process for recovering N-vinyl-2-pyrrolidone is provided which allows to recover N-vinyl-2-pyrrolidone efficiently and steadily and in high purity by continuous distillation from a mixed liquid...
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6433194 |
Separation of trioxane from liquid mixtures
Process for the removal of trioxane from a liquid mixture comprising trioxane, formaldehyde, alcohol, hemiformals formed from the form-aldehyde and the alcohol, usual secondary components arising...
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6423189 |
Process for the preparation of 1,3-dichloropropane
A process for the preparation of 1,3-dichloropropane by reacting bis( 3 -hydroxypropyl)ether with hydrogen chloride, optionally in the presence of tertiary basic nitrogen compounds or other...
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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...
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6375804 |
Tertiary butyl acetate recovery
The present invention provides a distillation separation method whereby tertiary butyl acetate is separated by distillation as an overhead stream from a bottoms acetic acid stream with the proviso...
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6364996 |
Device for treatment and removal of aqueous liquids by controlled atmospheric action
A bifurcated fan ( 1 ) which draws in atmospheric air through air/liquid contact blocks of plastic grids which are sprayed with the liquid to be treated. The blocks change position in order to be...
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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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6290820 |
Apparatus and method for concentrating a dilute solution
A method that employs a dilute solution, such as a dilute hydrogen peroxide solution, and concentrates the dilute solution to a yield a concentrated solution. A concentrated solution prepared by...
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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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6179966 |
Method for producing acrylic acid
The present invention concerns a method for producing acrylic acid which involves subjecting an acrylic acid-containing aqueous solution obtained by catalytic vapor phase oxidation of propylene...
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6123812 |
Process for distilling ethylene oxide
A process for distilling ethylene oxide out of a mixture including ethylene oxide in a column at an absolute pressure of from 2 to 10 bar and a temperature of 20 to 180° C. by withdrawing pure...
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6120651 |
Method for removing water from an aqueous fluid mixture
A method permits concentration of a water-miscible organic liquid in a mixture of such liquid and water, with recovery of a desired concentrate of the water-miscible organic liquid and water, and a...
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6117275 |
Process and device for regenerating a contaminated solvent
Process and apparatus for regenerating a contaminated solvent wherein said solvent is first separated from higher-boiling contaminants in an evaporator, and then contaminants having a lower boiling...
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6093845 |
Ester co-production
This invention relates to a process for the simultaneous co-production of ethyl acetate and n-butyl acetate. The process involves reacting a reaction mixture of ethanol, n-butanol and acetic acid...
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