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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...
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.
7205438 Solvent recovery blends from diene production  
A diene production stream comprising a solvent recovery blend from diene production comprising one or more fouling agent, one or more extractive distillation solvent, and from about 1 ppm to about...
7182839 Preventing deposition of fouling agents onto equipment  
Methods and compositions effective to prevent deposition of fouling agents, preferably polymerization precursors, on handling equipment, particularly during solvent recovery.
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...
6358402 Extractive distillation process for the reduction of sulfur species in hydrocarbons streams  
A method for separating sulfur species from hydrocarbon streams, particularly cracked naphtha streams, using extractive distillation. The method effectively separates sulfur species from cracked...
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....
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,...
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...
5817729 Vapor precipitation of polymers from solvent polymer blends by azeotropic spray drying  
A process for removing contaminating solvents from solutions containing solid solutes comprising contacting a co-solvent that forms an azeotrope with the contaminating solvent forming a mixture...
5772852 Separating HCI and halocarbons  
A process for separating HCl from pentafluoroethane, chloropentafluoroethane, chlorotrifluoroethane, trifluoromethane, and other fully saturated and unsaturated fluorocarbons, chlorofluorocarbons...
5730844 Liquid phthalic anhydride recovery process using a rectification tower with benzoic acid control  
A process for recovering phthalic anhydride as a liquid from a vapor phase oxidation product which comprises mixing the vapor phase oxidation product having a temperature of about 130° C. or...
5718808 Solvent assisted process for recovery of phthalic anhydride in the liquid phase by distillation  
A process for recovering phthalic anhydride as a liquid from a vapor phase oxidation product which comprises mixing the vapor phase oxidation product having a temperature of about 130° C. or...
5693193 Process for recovering propylene oxide  
Propylene oxide is recovered through the use of an additive in a distillation solution, resulting in suppressed side reactions and reduced loss of product. Propylene oxide is produced by oxidizing...
5453167 Separation of xylenes by extractive distillation  
p-Xylene cannot be separated from m-xylene by distillation or rectification because of the proximity of their boiling points. p-Xylene can be separated from m-xylene by means of extractive...
5430232 Enhanced volatilization of polychlorinated biphenyl compounds  
Polychlorinated biphenyls and chlorinated hydrocarbons are separated from soil by oil assisted desorption followed by vacuum stripping in presence of a sweep gas.
5429720 Solvent recovery from waste oils  
A distillation process for separating spent organic solvents such as trichloroethane or d-limonene from their contaminants such as oil is improved by the addition of a perfluorinated alkane or...
5421964 Process for separating HCl and halocarbons  
The present invention discloses an extractive distillation process for separating HCl from pentafluoroethane, chloropentafluoroethane, chlorotrifluoroethane, trifluoromethane, and other fully...
5399751 Method for recovering carboxylic acids from aqueous solutions  
Disclosed is a method for recovering carboxylic acids having from one to ten carbon atoms, and particularly formic acid, acetic acid and mixtures of formic and acetic acids, from aqueous solutions,...
5399244 Process to recover benzene from mixed hydrocarbons by extractive distillation  
Benzene and other aromatics are separated from a stream of mixed hydrocarbons containing both aromatics and non-aromatics by extractive distillation with a solvent system containing dimethyl...
5391263 Process for the separation of glycols from dimethyl terephthalate  
Separation of ethylene glycol and diethylene glycol from dimethyl terephthalate is accomplished by distillation using methyl benzoate or the methyl ester of p-toluic acid as an azeotropic agent.
5288370 Process for the separation of butenes and butanes by extractive distillation  
For the separation of butenes and butanes by extractive distillation, a charge mainly containing butenes and butanes is contacted in an extractive distillation column under pressure with a first...
5235117 Process for the preparation of boric oxide by hydrolysis of methyl borate and its use in the oxidation of alcohol-saturated hydrocarbons  
For preparing at least one boric oxide in an anhydrous or hydrated form and of general formula B 2 O 3 , xH 2 O, in which x is a number from 0 to 3, a methyl borate hydrolyzate comprising boric...
5232558 Separation of 4-methyl-2-pentanone from formic acid by extractive distillation with DMSO  
4-Methyl-2-pentanone cannot be easily separated from formic acid by distillation because of the closeness of their boiling points. 4-Methyl-2-pentanone can be readily removed from formic acid by...
5228956 Separation of 3-pentanone from formic acid by extractive distillation  
3-Pentanone cannot be completely removed from 3-pentanone and formic acid mixtures by distillation because of the presence of the maximum azeotrope. 3-Pentanone can be readily removed from...
5194123 Separation of 4-methyl-2-pentanone from acetic acid by extractive distillation with DMSO  
4-Methyl-2-pentanone cannot be easily separated from acetic acid by distillation because of the closeness of their boiling points. 4-Methyl-2-pentanone can be readily removed from acetic acid by...
5194122 Method for recovering volatile, organic compounds from manure  
A method for recovering volatile, organic compounds from manure, by: i) acidifying and concentrating the manure; ii) condensing the formed vapor; and iii) separating the volatile, organic...
5190619 Separation of 3-methyl-2-butanone from formic acid by extractive distillation with DMSO  
3-Methyl-2-butanone cannot be separated from formic acid by distillation because of the presence of the maximum boiling azeotrope. 3-Methyl-2-butanone can be readily removed from formic acid by...
5173156 Dehydration of formic acid by extractive distillation  
Formic acid cannot be completely removed from formic acid--water mixtures by distillation because of the presence of the maximum azeotrope. Formic acid can be readily removed from mixtures...
5154802 Separation of unsaturated hydrocarbons by extractive distillation  
The separation of alkadienes from close-boiling alkenes by extractive distillation employs as solvent either N-(β-mercaptoethyl)-2-pyrrolidone alone, or a mixture of...
5151161 Separation of olefinic hydrocarbons by extractive distillation  
The separation of alkadienes from close-boiling alkenes by extractive distillation employes as solvent N-methyl-2-thiopyrrolidone, alone or in admixture with unsubstituted sulfolane...
5147512 Separation of ketone isomers by extractive distillation  
The higher boiling ketone isomers are difficult to separate one from another by conventional distillation or rectification because of the close proximity of their boiling points. Ketone isomers can...
5145562 Extractive distillation of mixtures containing aromatic and olefinic hydrocarbons  
Aromatic hydrocarbons containing 6-10 carbon atoms per molecule are separated from close-boiling olefinic hydrocarbons by extractive distillation employing as solvent either...
5145561 Removal of water and methanol from propylene oxide by extractive distillation  
An extractive distillation agent consisting essentially of ethylene carbonate, propylene carbonate or a mixture thereof is fed to an extractive distillation column used for the distillation of...
5106459 Separation of p-menthane from p-cymene by extractive distillation  
p-Cymene and p-menthane are difficult to separate one from another by conventional distillation or rectification because of the close proximity of their boiling points. p-Cymene and p-menthane can...
5085740 Separation of alkenes from alkanes  
An extractive distillation process for separating at least one C 4 -C 10 alkene (monoolefin) from at least one close-boiling alkane (paraffin) employs as solvent a mixture of (a) at least one...
5069757 Separation of aromatics from alkanes  
An extractive distillation process for separating at least one aromatic hydrocarbon from at least one close-boiling alkane employs as solvent a mixture of (a) at least one...
5069756 Separation of cyclohexane from cyclohexene by azeotropic or extractive distillation  
Cyclohexane cannot be readily separated from cyclohexene by conventional distillation or rectification because of the close proximity of their boiling points. Cyclohexane can be separated from...
5068011 Separation of monoolefins from paraffins  
An extractive distillation process for separating at least one C 4 -C 10 alkene (monoolefin) from at least one close-boiling alkane employs solvent at least one N-mercaptoalkyl-2-pyrrolidone,...
5037512 Process for the purification of benzoic acid by distillation with an amine  
A process for the purification of crude benzoic acid obtained by the catalytic oxidation of toluene in the liquid phase, which is contaminated with impurities including phthalic acid and...
5032232 Extractive distillation of hydrocarbon mixtures  
Extractive distillation processes for separating aromatic hydrocarbon(s) or cycloalkane(s) or alkene(s) from close-boiling alkane(s) are carried out with a solvent including at least one...
4994150 Process for the purification of esters of mercapto acids  
The present invention provides a process to recover esters of mercapto acids from solutions containing water by mixing an extraction mixture comprising cycloalkane, arene, and an aqueous inorganic...
4969977 Separation of 2-methyl-butanol-1 from pentanol-1 by extractive distillation  
2-Methyl butanol-1 cannot be completely removed from 2-methyl butanol-1-pentanol-1 mixtures by distillation because of the proximity of their boiling points. 2-methyl butanol-1 can be readily...
4956052 Process for separation using supercritical fluid  
A process for separation of components of a mixture of more than one organic substance or of a mixture of at least one organic substance and water by extraction using a supercritical fluid as an...
4954224 Extractive distillation of hydrocarbon feeds employing mixed solvent  
Cycloalkanes (preferably cyclopentane and/or cyclohexane) are separated from close-boiling alkanes by extractive distillation employing as solvent a mixture of (a) at least one...
4948471 Separation of 4-methyl-2-pentanone from formic or acetic acid by extractive distillation with sulfolane  
4-Methyl-2-pentanone cannot be easily separated from formic acid or acetic acid by distillation because of the closeness of their boiling points. 4-Methyl-2-pentanone can be readily removed from...
4948470 Extractive distillation of alkane/cycloalkane feed employing mixed solvent  
A mixture of (a) at least one N-alkyl-2-pyrrolidone (preferably N-methyl-2-pyrrolidone) and (b) at least one sulfolane (preferably unsubstituted sulfolane) is used as solvent in the extractive...
4948469 Separation of formic acid from dioxane by extractive distillation with amides  
Dioxane cannot be completely removed from dioxane and formic acid mixtures by distillation because of the presence of the maximum azeotrope. Dioxane can be readily removed from dioxane - formic...
4939294 Preparation of ultra high purity methyl acetate  
In a process for the production of methyl acetate from methanol and glacial acetic acid involving countercurrently flowing acetic acid and methanol through a single reactive distillation column...
4935103 Separation of n-propanol from t-amyl alcohol by extractive distillation  
n-Propanol and t-amyl alcohol cannot be separated from each other by distillation because of the proximity of their boiling points. n-Propanol can be readily separated from t-amyl alcohol by using...
Matches 1 - 50 out of 188 1 2 3 4 >