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Browse by Category: Main > Chemistry
Class Information
Number: 585/865
Name: Chemistry of hydrocarbon compounds > Purification, separation, or recovery > By addition of extraneous agent, e.g., solvent, etc. > Organic agent > Heterocyclic or polymeric
Description: Subject matter wherein the agent has a molecular structure which includes a ring or cyclic configuration, which ring contains other than carbon atoms, or wherein the agent is of indefinite molecular weight, greater than 150, and made by reating with each other smaller molecules having definite identities.










Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8663461 Extraction process with novel solvent regeneration methods Mar. 4, 2014
8471088 Solvent quality control in extraction processes Jun. 25, 2013
8410329 Ethylene separation Apr. 2, 2013
8378164 Method for obtaining aromatic hydrocarbons from a hydrocarbon mixture Feb. 19, 2013
8076526 Extractive distillation of conjugated diene Dec. 13, 2011
8013197 Absorption and conversion of acetylenic compounds Sep. 6, 2011
7967976 Adsorption of vanadium compounds from fuel oil and adsorbents thereof Jun. 28, 2011
7956230 Reduction of organic halide contamination in hydrocarbon products Jun. 7, 2011
7879225 Energy efficient and throughput enhancing extractive process for aromatics recovery Feb. 1, 2011
7879918 Low-foaming gas processing compositions and uses thereof Feb. 1, 2011
7619126 Method for obtaining crude 1,3-butadiene from a C.sub.4 fraction Nov. 17, 2009
7553406 Process for removing polar impurities from hydrocarbons and mixtures of hydrocarbons Jun. 30, 2009
7388122 Dewaxing aid Jun. 17, 2008
7030237 Method and equipment for continuous and selective inclusion separation Apr. 18, 2006
6727399 Process for separating linear alpha olefins from saturated hydrocarbons Apr. 27, 2004
6617483 Polyalkylene glycol compositions for enhanced aromatic extraction Sep. 9, 2003
6559349 Process for separating internal and alpha olefins from saturated compounds May. 6, 2003
6555726 Methods for enhanced extractive distillation employing extractive distillation compositions comprising sulfolane and compatibility agent Apr. 29, 2003
6545192 Process for separating olefins from saturated hydrocarbons Apr. 8, 2003
6531103 Process for removing sulfur compounds from gas and liquid hydrocarbon streams Mar. 11, 2003
6475348 Mixture of substances containing compounds with vinyl groups and stabilizers Nov. 5, 2002
6395141 Separation of components from aromatic hydrocarbon mixtures thereof by extractive distillation May. 28, 2002
6392115 Separation of hydrocarbons by extractive distillation May. 21, 2002
6316685 Method for separating solids from hydrocarbon slurries Nov. 13, 2001
6271434 Process for separating linear alpha olefins from a crude stream containing saturated hydrocarbons, internal olefins, branched olefins, and linear alpha olefins Aug. 7, 2001
6211423 Process for separating saturated compounds from olefins Apr. 3, 2001
6207043 Method of preparing low-sulphur aliphatic compounds Mar. 27, 2001
6184431 Process for separating internal and alpha olefins from saturated compounds Feb. 6, 2001
6136155 Separation of mesitylene from 1,2,4-trimetyhlbenzene by azeotropic distillation Oct. 24, 2000
6007707 Process for the recovery of pure hydrocarbons from a hydrocarbon mixture Dec. 28, 1999
6005157 Cycloparaffin purification from petroleum streams Dec. 21, 1999
5972172 Separation of 1,2,4-trimethylbenzene from 1,2,3-trimethylbenzene by extractive distillation Oct. 26, 1999
5942656 Process for separating linear alpha olefins from 2-branched and/or 3-branched alpha olefins Aug. 24, 1999
5922193 Addition of ethers or aldehydes to furfural for aromatic extractions Jul. 13, 1999
5865958 Method for separating cyclohexene Feb. 2, 1999
5723026 Process for recovering pure benzene and pure toluene from aromatic hydrocarbon products Mar. 3, 1998
5720857 Separation of 1,2,4-trimethylbenzene from 1,2,3-trimethylbenzene by azeotropic distillation Feb. 24, 1998
5705038 Separation of phellandrene from limonene by extractive distillation Jan. 6, 1998
5681451 Settling aids for solids in hydrocarbons Oct. 28, 1997
5675055 Acidification/extraction treatment of waste caustic stream Oct. 7, 1997
5582693 Separation of 3-carene and limonene by azeotropic distillation Dec. 10, 1996
5562863 Methods and compositions for inhibiting vinyl aromatic monomer polymerization Oct. 8, 1996
5481059 Settling aids for solids in hydrocarbons Jan. 2, 1996
5470440 Method for inhibiting vinyl aromatic monomer polymerization Nov. 28, 1995
5466345 Separation of o-xylene from p-xylene and m-xylene by azeotropic distillation Nov. 14, 1995
5458741 Separation of benzene from close boiling hydrocarbons by extractive distillation Oct. 17, 1995
5430225 Methods of production of novel molybdenum-sulfide dimers and reactions of the same Jul. 4, 1995
5414194 Method of production of novel molybdenum-sulfide dimers and reactions of the same May. 9, 1995
5405504 Separation of 1-decene from 2-octanone by azeotropic distillation Apr. 11, 1995
5405505 Separation of benzene from close boiling hydrocarbons by azeotropic distillation Apr. 11, 1995

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