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7304176 |
Process for producing easily polymerizable substance
It is an object of the present invention to provide a process for producing easily polymerizable substance, which can realize stable operation of a purification system, and can stably maintain a...
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7169268 |
Color stabilization of amines
The present invention concerns a process for providing tertiary amine products which are color-stable, and have a greatly reduced tendency to take on color during their storage. According to the...
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7153397 |
Process for the purification of fluoromethyl hexafluoroisopropyl ether
A process for the purification of fluoromethyl hexafluoroisopropyl ether which comprises contacting a crude composition comprising fluoromethyl hexafluoroisopropyl ether and hexafluoroisopropyl...
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7048834 |
Method for purification of acrylic acid
The present invention provides an industrially easy and economical method for purification of acrylic acid which enables to efficiently eliminate impurities from a crude acrylic acid containing...
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6649205 |
Solvent extraction
There is described a process for the extraction of at least one relatively polar component from a material which may be naturally occuring or a synthetic mixture, the process comprising the steps...
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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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6383343 |
Separation of components from methanol mixtures by extractive distillation
A method of separating methanol and acetone, and methanol and methyl acetate involves distilling a mixture of the components by an extractive distillation process in the presence of an extractive...
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6375807 |
Separation of ethanol mixtures by extractive distillation
A method of separating ethanol and ethyl acetate, and ethanol and water involves distilling a mixture of the components by an extractive distillation process in the presence of an extractive...
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6352619 |
Method for purifying acrylic acid
Process for purifying acrylic acid in order to remove the polymer-type impurities in those places in the distillation columns in which they have a tendency to accumulate, and more particularly a...
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6228227 |
Separation of (meth)acrylic acid by rectification
In a process for the separation by rectification of (meth)acrylic acid from a mixture containing (meth)acrylic acid and an inert hydrophobic organic liquid having a boiling point higher than that...
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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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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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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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6074532 |
Adjunct for removal of aldehydes from chemical manufacturing production streams during distillative purification
A method for improving purification efficiency when distilling off aldehyde contaminants during chemical manufacturing processes by adding a substituted aromatic amine having electron donating...
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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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6007707 |
Process for the recovery of pure hydrocarbons from a hydrocarbon mixture
Process for the recovery of pure hydrocarbons from a hydrocarbon mixture, more particularly, a high aromatics content hydrocarbon mixture, by extractive distillation in an extractive distillation...
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5993609 |
Process for the purification of phosphorus oxychloride
A process for the purification of recovered or regenerated phosphorus oxychloride contaminated by reactive organic compounds, by reacting the contaminated phosphorus oxychloride with from 0.1 to 5%...
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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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5910232 |
Method for inhibiting polymer formation in styrene processing
Inhibition performance is improved in styrene processing through the addition of a stable nitroxide free radical compound to the styrene feed and to the reflux of at least one column.
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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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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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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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5824195 |
Process for distilling crude acrylic silane solution
A process for distilling a crude acrylic silane solution particularly containing impurities in a commercial scale for separating acrylic silane in the presence of a hindered phenol and/or amine as...
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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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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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5763695 |
Separation of 3-methyl-1-butanol from 1-pentanol by extractive distillation
3-Methyl-1-butanol cannot be separated from 1-pentanol by distillation or rectification because of the closeness of their boiling points. 3-Methyl-1-butanol is readily separated from 1-pentanol by...
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5763694 |
Separating 3-methyl-1-butanol from 1-pentanol by azeotropic distillation
3-Methyl-1-butanol cannot be separated from 1-pentanol by distillation or rectification because of the closeness of their boiling points. 3-Methyl-1-butanol is readily separated from 1-pentanol by...
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5738764 |
Separation of T-Amyl alcohol from 2-methyl-1- propanol by azeotropic distillation
T-Amyl alcohol is difficult to separate from 2-methyl-1-propanol by conventional distillation or rectification because of the proximity of their boiling points. T-Amyl alcohol can be easily...
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5738763 |
Separation of 2-methyl-1-propanol from 2-methyl-1-butanol by extractive distillation
2-Methyl-1-propanol is difficult to separate from 2-methyl-1-butanol by conventional distillation or rectification because of the proximity of their boiling points. 2-Methyl-1-propanol can be...
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5728272 |
Separation by rectification of unsaturated carboxylic acids from solvents
In a process for the separation by rectification of unsaturated carboxylic acids from solvents in which the acids were absorbed after the synthesis reaction, the rectification is briefly...
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5718809 |
Separation of t-amyl alcohol from 2-methyl-1-propanol by extractive distillation
T-Amyl alcohol and 2-methyl-1-propanol are difficult to separate by conventional distillation or rectification because of the proximity of their boiling points. T-Amyl alcohol can be easily...
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5716499 |
Separation of 2-methyl-1-propanol from 1-butanol by azeotropic distillation
2-Methyl-1-propanol is difficult to separate from 1-butanol by conventional distillation or rectification because of the proximity of their boiling points. 2-Methyl-1-propanol can be easily...
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5709781 |
Separation of 1-butanol from 2-pentanol by extractive distillation
1-Butanol is difficult to separate from 2-pentanol by conventional distillation or rectification because of the proximity of their boiling points. 1-Butanol can be easily separated from 2-pentanol...
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5705038 |
Separation of phellandrene from limonene by extractive distillation
Phellandrene is difficult to separate from limonene by conventional distillation or rectification because of the proximity of their boiling points. Phellandreneecan be readily separated from...
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5698080 |
Separation of phellandrene from limonene by azeotropic distillation
Phellandrene is difficult to separate from limonene because of the proximity of their boiling points. They are readily separated by azeotropic distillation. Effective agents are ethanol, dioxolane...
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5658435 |
Separation of 2-methyl -1-propanol from 2-butanol by azeotropic distillation
2-Methyl-1-propanol is difficult to separate from 2-butanol by conventional distillation or rectification because of the proximity of their boiling points. 2-Methyl-1-propanol can be easily...
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5645695 |
Separation of 2-methyl-1-propanol from 2-methyl-1-butanol by azeotropic distillation
2-Methyl-1-propanol is difficult to separate from 2-methyl-1-butanol by conventional distillation or rectification because of the proximity of their boiling points. 2-Methyl-1-propanol can be...
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5582693 |
Separation of 3-carene and limonene by azeotropic distillation
3-Carene and limonene cannot be separated from each other by rectification because of the closeness of their boiling points. They are readily separated by azeotropic distillation. Effective agents...
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5482597 |
Purification of crude (meth)acrylic acid
In a process for purifying crude (meth)acrylic acid, the crude (meth)acrylic acid is worked up by distillation after addition of an organic carboxylic acid hydrazide and, if desired, an organic...
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5470443 |
Separation of isopropanol from 2-butanone by extractive distillation
Isopropanol is difficult to separate from 2-butanone by conventional distillation or rectification because of the proximity of their boiling points. Isopropanol can be readily separated from...
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5453166 |
Separation of ethanol from 2-butanone by extractive distillation
Ethanol is impossible to separate from 2-butanone by conventional distillation or rectification because of the minimum boiling azeotrope between these two. Ethanol can be readily separated from...
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5445716 |
Separation of ethanol from isopropanol by extractive distillation
Ethanol is difficult to separate from isopropanol by conventional distillation or rectification because of the proximity of their boiling points. Ethanol can be readily separated from isopropanol...
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5441659 |
Compositions including a fluoroamine and a second component
Compositions of N(CF 3 ) a (CHF 2 ) b (CH 2 F) c , where a, b and c are integers from 0 to 3 and a+b+c=3, and C n F m H 2n +2-m, where n is an integer from 1 to 3 and m is an integer from 1 to...
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5407542 |
Separation of 3-methyl-2-butanol from 1-butanol by azeotropic distillation
3-Methyl-2-butanol is difficult to separate from 1-butanol by conventional distillation or rectification because of the proximity of their boiling points. 3-Methyl-2-butanol can be readily...
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