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8080140 Process for debottlenecking a system for the separation of a conjugated diolefin  
A process for debottlenecking a system for the separation of a conjugated diolefin the system including a first extraction section having an extractive distillation column and a stripping column...
8062483 Separation of chlorosilanes  
Crude chlorosilane streams containing lower-boiling chlorosilanes and higher-boiling chlorosilanes are separated by contacting them with a distillation aid. The lower-boiling chlorosilanes are...
7879199 Polyether ketone, its monomer and its phenolate  
A process for the preparation of an alkali metal salt of 4-chloro-4′-hydroxy benzophenone including the steps of (a) preparing purified 4-chloro-4′-hydroxy benzophenone by a process including dis...
7699962 Processes utilizing extractive distillation  
The invention relates to methods for separating mixture components such as reactor effluent components. In particular, the invention relates to the use of an extractive agent such as a hydrocarbon...
7692053 Process for obtaining crude 1,3-butadiene from a C4 cut  
1,3-butadiene is obtained by extractive distillation with a selective solvent from a C4 cut comprising C4 acetylenes as secondary components in a dividing wall column having a bottom evaporator, in...
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...
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),...
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...
7323579 Separation of propylene oxide from a mixture comprising propylene oxide and methanol  
A method of separating propylene oxide from a mixture (M) comprising 5 to 50 percent by weight propylene oxide and 50 to 85 percent by weight methanol, said method comprising (i) introducing said...
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 general...
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.
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.
7118654 Riser base  
A chimney tray for a column for thermal treatment of a liquid. The chimney tray includes a total take-off of liquid by a drain connection arranged at an edge of the chimney tray, and having one or...
7049450 Process for the purification of crude propene oxide  
A process for the purification of a crude propene oxide containing methanol and acetaldehyde by a continuously operated extractive distillation using an extraction solvent lowering the volatility...
6964728 Separation process  
Bisphenol-A-bis(neopentylglycolphosphate) products of enhanced properties and processes for preparing them are described. One of the processes includes (a) mixing and reacting neopentyl glycol and...
6818121 Production process of indene  
Indene is produced from an indene-containing coal tar distillate by adding a glycol to the indene-containing coal tar distillate and then conducting azeotropic distillation to obtain an indene...
6802959 Separation of olefinic hydrocarbons from sulfur-containing hydrocarbons by use of a solvent  
A process for separating olefins from sulfur-containing hydrocarbons contained in a hydrocarbon feedstock is disclosed and includes contacting the hydrocarbon feedstock with N-hydroxyethyl...
6632330 Process for purification of alkyl alkanoate  
A process for the recovery of substantially pure alkyl alkanoate, such as ethyl acetate, from an impure feedstock. The impure feedstock is contacted with a selective hydrogenation catalyst in the...
6605193 Recovery of HFC-32  
A method for isolating 32 from a crude mixture containing HCl and an azeotropic mixture of 32 and HF is provided without the need to isolate any HF azeotrope.
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...
6551502 Process of removing sulfur compounds from gasoline  
A process for the removal of sulfur compounds from a hydrocarbon stream is disclosed. In a preferred embodiment, the process includes extractive distillation of a gasoline stream from a fluid...
6475348 Mixture of substances containing compounds with vinyl groups and stabilizers  
A mixture contains one or more vinyl-containing compounds as component (A) and, as a further component, a stabilizer (B) which contains one or more readily volatile nitroxyl compounds as component...
6458249 Process for purifying perfluorinated products  
Nitrogen trifluoride (NF3) containing less than 10 parts-per-million molar impurities, e.g., tetrafluoromethane (PFC-14), is disclosed. Azeotropic and extractive distillation processes using...
6441252 Apparatus for producing phenol using reactive distillation  
An apparatus for producing phenol and acetone from cumene hydroperoxide comprises a reactive distillation column comprising at its upper portion a distillation column and at its lower portion a...
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...
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...
6379552 Method for resolving optical isomers  
A method for efficiently resolving optical isomers, in which a discriminating liquid consisting of a discriminating agent capable of discriminating optical isomers and a diluent are brought into...
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...
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...
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...
6315869 Process for purification of perfluorovinyl ethers  
A perfluorovinyl ether of the formula: RfO(CF2 CFXO)n CFCF2 (1)in which Rf is a perfluoralkyl group, X is a fluorine atom or a trifluoromethyl group, and n is a number of 0 to 20 containing i...
6299737 Recovery of glycols from used glycol-containing technical fluids  
A process for recovering glycols from used glycol-containing technical fluids, especially from used antifreeze comprises adding to the used glycol-containing technical fluids an organic solvent...
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...
6175045 Process for the preparation of pentafluoroethane  
There is provided a process of effectively separating pentafluoroethane (HFC-125) from a mixture of HFC-125 and chloropentafluoroethane (CFC-115).When the mixture of HFC-125 and CFC-115 is...
6159345 Method and apparatus for recovering and/or recycling solvents  
A method and apparatus for recycling and recovering potentially explosive solvents includes providing a contaminated solvent to a distillation tank, vaporizing the solvent in the distillation tank,...
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...
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....
6117276 Inhibiting polymerization of vinyl aromatic monomers  
When a nitroxyl compound is heated in an oxygen-free atmosphere with a vinyl aromatic monomer at 50-140° C. for up to 60 days, it forms an activated inhibitor mixture which is superior to the ...
6045808 Method for removing high boiling solvents from drug formulations by vacuum drying  
A method for removing a high boiling solvent from a pharmaceutical composition dissolved in the high boiling solvent comprising adding a low boiling co-solvent to the solution to form a mixture of...
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...
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...
6039845 Process for the purification of pentafluoroethane by extractive distillation  
A process for the purification of pentafluoroethane (F125) containing chloropentafluoroethane (F115). The F125-F115 mixture to be purified is subjected to an extractive distillation, the extractant...
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...
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....
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...
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...
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...
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...
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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