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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...
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7311807 |
Process for the separation of mixtures containing m-and p-dichlorobenzene
A process for the separation of dichlorobenzene mixtures containing m- and p-dichlorobenzene in which:
(i) the mixture is as an extracting agent contacted with a phosphoric ester of the...
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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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7241365 |
Material for a facility for the production of anhydrous formic acid
The invention relates to an apparatus and a process for the preparation of anhydrous or substantially anhydrous formic acid. This apparatus is constructed partly or entirely of substantially...
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7141641 |
Method and apparatus for production of alkyl aryl ether and diaryl carbonate
A method and apparatus for continuously producing an alkyl aryl ether and a diaryl carbonate by reacting a dialkyl carbonate and an aromatic alcohol in presence of a transesterification catalyst.
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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...
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7037412 |
Method for preparing deodorized N-vinyl-2-pyrrolidone
The invention provides a method for producing purified N-vinyl-2-pyrrolidone free of odorous components. The method is composed of distilling with a distillation column a liquid, which is formed by...
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6787001 |
Method for distilling (meth) acrylic acid solution
A method for distilling a raw material liquid containing (meth)acrylic acid substantially free from azeotropic solvents, collected with a collection agent from a mixed gas obtained by gas phase...
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6673959 |
Preparation of carboxylic esters catalyzed by a sulphonic acid
The preparation of a carboxylic ester by direct reaction of a carboxylic acid and an alcohol catalyzed by a sulphonic acid R—SO 3 H is carried out in the presence of a solid comprising tertiary...
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6582565 |
Recovery of 3,4-epoxy-1-butene by extractive distillation
Disclosed is a process for the recovery and purification of 3,4-epoxy-1-butene (epoxybutene) from mixtures comprising epoxybutene and aliphatic and aromatic hydrocarbons containing five to seven...
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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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6465665 |
High efficiency process for the recovery of the high pure sterols
A high efficiency continuous process for the recovering high purity sterol mixtures from mixtures of neutral compounds obtained form black liquor soap skimings of the cellulose pulping industry or...
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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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6444096 |
Process for the recovery and purification of cyclobutanone
A process for the recovery and purification of cyclobutanone from a crude product mixture obtained from an oxidation product mixture resulting from the oxidation of cyclobutanol to cyclobutanone in...
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6395141 |
Separation of components from aromatic hydrocarbon mixtures thereof by extractive distillation
A method of separating aromatic hydrocarbons and non-aromatic hydrocarbons, and aromatic hydrocarbons and naphtenes involves distilling a mixture of the components by an extractive distillation...
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6391161 |
Method for reducing the chlorine content of low molecular weight isocyanates
An organic isocyanate or mixture of isocyanates is treated with at least one high molecular weight ester of phosphoric acid corresponding to a specified formula to remove chlorine compounds. The...
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6315868 |
Method of separating dimethyl carbonate and methanol
A method of separating methanol and dimethyl carbonate in a distillation column through extractive distillation. The extractive distillation is conducted in the presence of an extractive...
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6207022 |
Purification of crude (meth) acrylic acid
Crude (meth)acrylic acid is purified by a process in which a primary amine compound and an organic sulfonic acid are added to the crude (meth)acrylic acid and the latter is then worked up by...
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6191285 |
Process for the preparation of ketorolac tromethamine
The present invention provides an improved process for producing ketorolac tromethamine. The preferred method utilizes a three-part solvent system, comprising isopropanol, ethyl acetate and water.
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6179967 |
Purification process of pentrafluoroethane
A purification process of pentafluoroethane from a crude pentafluoroethane containing chloropentafluoroethane as a by-product by extractive distillation using an extracting reagent having a...
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6139693 |
Method for obtaining hexamethylene diamine from mixtures containing hexamethylene diamine
A process for recovering hexamethylenediamine (I) from a mixture (II) including (I) hexamethylenediamine, (III) hexamethyleneimine, (IV) a compound selected from...
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6136155 |
Separation of mesitylene from 1,2,4-trimetyhlbenzene by azeotropic distillation
Mesitylene is difficult to separate from 1,2,4-Trimethylbenzene because of the proximity of their boiling points. They are readily separated by azeotropic distillation. Effective agents are...
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6042697 |
Separation of 9,11-Diene C18 fatty acid from 10,12-Diene C18 fatty acid by azeotropic distillation
9,11- Diene C18 fatty acid cannot be separated from 10,12-Diene C18 fatty acid by conventional rectification because of the proximity of their boiling points. 9,11-Diene C18 fatty acid can be...
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6039846 |
Separation of 3-methyl-2-pentenal from n-butanol by azeotropic distillation
3-Methyl-2-pentenal cannot be separated from 1-butanol by conventional rectification because of the proximity of their boiling points. 3-methyl-2-pentenal can be readily separated from n-butanol by...
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6033529 |
Separation of mesitylene from 4-ethyl toluene by azeotropic distillation
Mesitylene cannot be separated from 4-ethyl toluene by distillation because of the proximity of their boiling points. They are readily separated by azeotropic distillation. Effective agents are...
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6024841 |
Separation of 2-methyl-1-butanol and 3-methyl-1-butanol from 1-pentanol by extractive distillation
2-Methyl-1-butanol and 3-methyl-1-butanol are difficult to separate from 1 pentanol by conventional distillation or rectification because of the proximity of their boiling points....
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6017423 |
Separation of 3-methyl-2-pentenal from N-butanol by extractive distillation
3-Methyl-2-pentenal cannot be separated from n-butanol by conventioal rectification because of the proximity of their boiling points. 3-methyl-2-pentenal can be readily separated from n-butanol by...
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6004435 |
Separation of cumene from 3-ethyl toluene by azeotropic distillation
Cumene cannot be separated from 3-ethyl toulene by distillation because of the proximity of their boiling points. They are readily separated by azeotropic distillation. Effective agents are methyl...
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5993610 |
Separation of ethyl acetate from ethanol by azeotropic distillation
Ethyl acetate cannot be separated from ethanol by distillation or rectification because of the closeness of their boiling points. Ethyl acetate is readily separated from ethanol by azeotropic...
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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...
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5972173 |
Allyl alcohol purification
Mixtures of allyl alcohol and n-propanol are separated by extractive distillation using propylene carbonate, N-methyl pyrrolidone or gamma-butyrolactone extractive distillation solvent.
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5972172 |
Separation of 1,2,4-trimethylbenzene from 1,2,3-trimethylbenzene by extractive distillation
1,2,4-Trimethylbenzene is difficult to separate from 1,2,3-trimethylbenzene by conventional distillation or rectification because of the proximity of their boiling points. 1,2,4-trimethylbenzene...
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5961789 |
Separation of t-amyl alcohol from n-butanol by extractive distillation
T-Amyl alcohol cannot be separated from n-butanol by distillation or rectification because of the closeness of their boiling points. T-Amyl alcohol is readily separated from n-butanol by extractive...
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5928478 |
Separation of linoleic acid from linolenic acid by azeotropic distillation
Linoleic acid cannot be separated from linolenic acid by distillation or rectification because of the closeness of their boiling points. Linoleic acid is readily separated from linolenic acid by...
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5908538 |
Separation of T-amyl alcohol from 2- methyl-1 -propanol azeotropic distillation
2-Methyl-1-propanol cannot be separated from t-amyl alcohol by distillation or rectification because of the closeness of their boiling points. 2-Methyl-1-propanol is readily separated from t-amyl...
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5904815 |
Separation of t-amyl alcohol from n-butanol by azeotropic distillation
t-Amyl alcohol cannot be separated from n-butanol by distillation or rectification because of the closeness of their boiling points. t-Amyl alcohol is readily separated from n-butanol by azeotropic...
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5900125 |
Continuous preparation of alkyl esters of (meth)acrylic acid and apparatus for this purpose
In a process and an apparatus for the continuous preparation of alkyl esters of (meth)acrylic acid by reacting (meth)acrylic acid and monohydric alkanols of 1 to 8 carbon atoms in the homogeneous,...
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5897750 |
Separation of acetone from isopropanol-water mixtures by extractive distillation
Acetone cannot be separated from a mixture of isopropanol and water because of the closeness of their boiling points. Acetone can be easily separated from isopropanol and water by extractive...
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5882485 |
Process for the separation of dimethyl ether and chloromethane in mixtures
A process for the separation of dimethyl ether and chloromethane in mixtures A process for the separation of dimethyl ether and chloromethane in mixtures by two distillation steps. In the first...
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5879517 |
Method for separating 2-butanol from t-amyl alcohol using certain organic compounds as the agent in extractive distillation
2-Butanol cannot be sparated from t-amyl alcohol by distillation or rectification because of the closeness of their boiling points. 2-Butanol is readily separated from t-amyl alcohol by extractive...
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5876569 |
Separation of methyl ethyl ketone from ethanol by extractive distillation
Methyl ethyl ketone cannot be separated from ethanol by distillation or rectification because of the closeness of their boiling points. Methyl ethyl ketone is readily separated from ethanol by...
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5869700 |
Method for recovering phthalic anhydride/maleic anhydride mixtures by distillation
A process for recovering phthalic anhydride and maleic anhydride from a maleic anhydride-rich vapor phase oxidation product comprising the step of: contacting the vapor phase oxidation product...
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5851362 |
Separation of 4-methyl-2-pentanol from 3-methyl-1-butanol by extractive distillation
4-Methyl-2-pentanol cannot be separated from 3-methyl-1-butanol by distillation because of the closeness of their boiling points. 4-Methyl-2-pentanol can be easily separated from 3-methyl-1-butanol...
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5849982 |
Recovery of styrene from pyrolysis gasoline by extractive distillation
An extractive distillation process for separating at least one substituted unsaturated aromatic from a pyrolysis gasoline mixture, containing said aromatic and at least one close-boiling aromatic...
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5840160 |
Separation of 3-carene from limonene by extractive distillation
3-Carene is difficult to separate from limonene by conventional distillation or rectification because of the proximity of their boiling points. 3-Carene can be readily separated from limonene by...
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5804040 |
Purification process for silane compound
There is provided a purification process for dimethoxymethylsilane in which a mixture containing dimethoxymethylsilane and methanol is subjected to a first distillation step in which the mixture is...
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5795447 |
Separation of 2-butanol from isobutanol by extractive distillation
2-Butanol cannot be separated from isobutanol by distillation or rectification because of the closeness of their boiling points. 2-Butanol is readily separated from isobutanol by extractive...
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5789629 |
Separating 3-methyl-1-butanol from 1-pentanol using certain organic compounds as the agent in extractive distillation
3-Methyl-1-butanol is difficult to separate from 1-pentanol by conventional distillation or rectification because of the proximity of their boiling points. 2 Methyl-1-butanol can be easily...
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5779862 |
Separation of 2-methyl-1-butanol and 3-methyl-1-butanol from 1-pentanol by azeotropic distillation
2-Methyl-1-butanol and 3-methyl-1-butanol are difficult to separate from 1-pentanol by conventional distillation or rectification because of the proximity of their boiling points....
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5776321 |
Separation of t-amyl alcohol from 1-propanol by azeotropic distillation
1-Propanol cannot be separated from t-amyl alcohol by distillation or rectification because of the closeness of their boiling points. 1-Propanol is readily separated from t-amyl alcohol by...
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