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7402720 |
Distillation process for removal of methyl acetylene and/or propadiene from an olefin stream
The present invention provides a process for removing methyl acetylene and/or propadiene from a propylene stream and/or a butylene stream by two step fractionation. Methyl acetylene and/or...
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7371309 |
Purification of difluoromethane by extractive distillation
The present invention provides extractive distillation processes for removing difluoromethane (HFC-32) from a mixture comprising HFC-32 and at least one of chlorodifluoromethane (CFC-12),...
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7234691 |
Radial-crossflow distillation trays for divided wall column applications
An assembly of trays in a divided wall column having an inner column wall, a dividing wall, and an interior space includes: a first tray having at least one radial downcomer adjacent the dividing...
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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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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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6982026 |
Azeotropic distillation process for producing organic acids or organic acid amides
Disclosed herein are methods for the recovery of at least one of an organic acid or an organic acid amide, such as a heat stable lactic acid or lactamide, from a feed stream which contains the...
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6926810 |
Process for obtaining an organic acid from an organic acid ammonium salt, an organic acid amide, or an alkylamine organic acid complex
Disclosed herein are methods for the recovery of an organic acid, such as a heat stable lactic acid, from a feed stream which contains at least one of an organic acid amide, an organic acid...
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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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6736941 |
Process for purifying propylene oxide
A process is described for purifying propylene oxide, which includes the step of distilling propylene oxide containing impurities in the presence of a hydrocarbon having 5 carbon atoms or less....
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6679975 |
Process for recovering the methanol contained in a liquid hydrocarbon feed
The present invention aims to isolate the azeotropes formed in a distillation column (B 1 ) by methanol, propane and butane. The azeotropes are then liquefied in heat exchanger (E 2 ) and mixed in...
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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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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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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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6458249 |
Process for purifying perfluorinated products
Nitrogen trifluoride (NF 3 ) containing less than 10 parts-per-million molar impurities, e.g., tetrafluoromethane (PFC-14), is disclosed. Azeotropic and extractive distillation processes using...
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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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6352618 |
Modular solvent recovery device
A process is disclosed for manufacturing a concentrated residue from a photopolymer fluid which includes photopolymer and photopolymer solvent. The photopolymer fluid may be derived by chemically...
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6340414 |
Process for the recovery of perfluorinated sulphonic acids from spent acid
Process for the recovery of fluorinated sulphonic acid including the step of subjecting the spent acid to heat treatment with stepwise or continuously increasing temperature, withdrawing at least...
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6299736 |
Process for recovering γ-butyrolactone from a mixture of heavy organics
Gamma-Butyrolactone (GBL) is recovered from a mixture containing GBL and other heavy organics by a process of azeotropic distillation in the presence of a C 8 -C 10 hydrocarbon as an azeotroping...
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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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6166270 |
Extractive distillation separation
High purity tertiary butyl alcohol is obtained from mixtures comprised of tertiary butyl alcohol and tertiary butyl acetate by extractive distillation using a hydrocarbon extractive solvent such as...
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6120652 |
Method for purifying crude 1,1,1,3,3-pentafluoropropane
The invention relates to a method for purifying a crude 1,1,1,3,3-pentafluoropropane (HFC-245fa) containing HFC-245fa and 1-chloro-3,3,3-trifluoro-trans-1-propene (HCFC-1233zd(t)), by distillation....
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6066238 |
Hydrocarbon separation
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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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6033530 |
Continuous distillation of thermolabile monomers
A process for the continuous distillation of thermolabile monomers under reduced pressure in a column includes feeding the thermolabile monomers in vapor or liquid form to the column, ...
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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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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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5964987 |
Neutral oil removal from natural cresylic acid mixtures
Natural cresylic acid is processed to remove neutral oil impurities by countercurrent liquid/liquid extraction using a heavy phase solvent of a mixture of glycerol and another polyhydric alcohol,...
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5922175 |
Purification of chlorotetraflouroethane by extractive distillation
A process for the purification of 1-chloro-1,2,2,2-tetrafluoroethane (F124) containing 1,2-dichlorotetrafluoroethane (F114) and/or 1,1-dichlorotetrafluoroethane (F114a). The F124 to be purified is...
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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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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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5853551 |
Process for the separation of alpha-olefins by distillation of an effluent comprising ethylene and 1-butene
The invention concerns a process for the separation of a mixture comprising ethylene, 1-butene, alpha-olefins containing at least 6 carbon atoms per molecule and possibly heavier hydrocarbon...
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5834585 |
Method for the separation of hexamethylcyclotrisiloxane
A method for separating hexamethylcyclotrisiloxane that does not require the use of a distillation set up adapted for use with solids and that collects the hexamethylcyclotrisiloxane in the form of...
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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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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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5776322 |
Separation of 4-methyl-2-pentanol from 3-methyl-1-butanol by azeotropic 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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5772853 |
Separation of 1-propanol from t-amyl alcohol by extractive distillation
1-Propanol and t-amyl alcohol cannot be separated 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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5762764 |
Purification of acetone
Close boiling hydrocarbon impurities are separated from acetone by extractive distillation using a C 9 -C 14 alkane and/or a C 8 -C 12 aromatic hydrocarbon extractive distillation solvent.
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5759359 |
Separation of 2-butanol from tert.amyl alcohol by azeotropic distillation
2-Butanol cannot be separated 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 azeotropic...
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5660690 |
Method for distilling hexamethylcyclotrisiloxane
The invention relates to an improved distillation method wherein hexamethylcyclotrisiloxane is isolated from a crude blend thereof by mixing the crude blend with a hydrocarbon co-solvent having a...
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5659095 |
Composition for inhibiting the polymerization of aromatic vinyl monomers
A polymerization inhibitor composition for inhibiting the polymerization of aromatic vinyl monomers at elevated temperatures comprising: (a) a benzofuroxan derivative of the formula ##STR1##...
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5658436 |
Separation of 2-methyl-1-butanol from 3-methyl-1-butanol by extractive distillation
2-Methyl-1-butanol is impossible to separate from 3-methyl-l-butanol because they both boil at 130° C. 2-Methyl-1-butanol can be readily separated from 3-methyl-1-butanol by extractive...
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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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