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Class Information
Number: 585/857
Name: Chemistry of hydrocarbon compounds > Purification, separation, or recovery > By addition of extraneous agent, e.g., solvent, etc. > S containing > S dioxide, sulfolane, or sulfolene
Description: Subject matter wherein an agent is one of the sulfur-oxygen compounds, sulfur dioxide (SO2










Patents under this class:
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Patent Number Title Of Patent Date Issued
8680358 Methods for removing heavy hydrocarbons from extractive solvents Mar. 25, 2014
8663461 Extraction process with novel solvent regeneration methods Mar. 4, 2014
8506820 Process and apparatus for online rejuvenation of contaminated sulfolane solvent Aug. 13, 2013
8471088 Solvent quality control in extraction processes Jun. 25, 2013
7879225 Energy efficient and throughput enhancing extractive process for aromatics recovery Feb. 1, 2011
7847142 HF alkylation process with acid regeneration Dec. 7, 2010
7803271 Method of extracting the hydrogen sulfide contained in a hydrocarbon gas Sep. 28, 2010
7790943 Integrated process for removing benzene from gasoline and producing cyclohexane Sep. 7, 2010
7744749 Diesel oil desulfurization by oxidation and extraction Jun. 29, 2010
7355087 Production of 1-alkenes from mixed olefin streams using catalytic distillation Apr. 8, 2008
7202391 Process for inhibiting polymerization of an aromatic vinyl compound Apr. 10, 2007
7078580 Process for separating aromatics by extractive distillation and a composite solvent used therein Jul. 18, 2006
6781026 Aromatics purification from petroleum streams Aug. 24, 2004
6660899 Methods for enhanced aromatic extraction employing sulfone-sulfoxide compositions Dec. 9, 2003
6623659 Separation of olefins from paraffins using ionic liquid solutions Sep. 23, 2003
6617483 Polyalkylene glycol compositions for enhanced aromatic extraction Sep. 9, 2003
6565742 Aromatics separation process and method of retrofitting existing equipment for same May. 20, 2003
6555726 Methods for enhanced extractive distillation employing extractive distillation compositions comprising sulfolane and compatibility agent Apr. 29, 2003
6441264 Method for separating benzothiophene compounds from hydrocarbon mixture containing them, and hydrocarbon mixture obtained by said method Aug. 27, 2002
6399847 Method of purifying 1,3,5-triisopropylbenzene Jun. 4, 2002
6303843 Method for removing sulfolane present in hydrocarbon Oct. 16, 2001
6277271 Process for the desulfurization of a hydrocarbonaceoous oil Aug. 21, 2001
6207043 Method of preparing low-sulphur aliphatic compounds Mar. 27, 2001
6171478 Process for the desulfurization of a hydrocarbonaceous oil Jan. 9, 2001
6114593 Method for reducing organic fluoride levels in hydrocarbons Sep. 5, 2000
6005157 Cycloparaffin purification from petroleum streams Dec. 21, 1999
5965784 Process and apparatus for extracting aromatic compounds contained in a hydrocarbon feedstock Oct. 12, 1999
5880325 Aromatics extraction from hydrocarbon oil using tetramethylene sulfoxide Mar. 9, 1999
5877385 Process including extractive distillation and/or dehydrogenation to produce styrene from petroleum feedstock including ethyl-benzene/xylene mixtures Mar. 2, 1999
5849982 Recovery of styrene from pyrolysis gasoline by extractive distillation Dec. 15, 1998
5689033 Process for removal of impurities from light paraffin isomerization feedstocks Nov. 18, 1997
5648587 Method for separating sulfone from a hydrocarbon stream having a concentration of sulfone producing a dry sulfone product Jul. 15, 1997
5476987 Method of removing halogenated aromatic compound from hydrocarbon oil Dec. 19, 1995
5463162 Alkylation catalyst regeneration Oct. 31, 1995
5458741 Separation of benzene from close boiling hydrocarbons by extractive distillation Oct. 17, 1995
5443697 Separation of heptane from 1-heptene by extractive distillation Aug. 22, 1995
5399244 Process to recover benzene from mixed hydrocarbons by extractive distillation Mar. 21, 1995
5393385 Separation of hexane from vinyl acetate and methyl acrylate by extractive distillation Feb. 28, 1995
5382746 Removal of light ASO in HF alkylation process Jan. 17, 1995
5284993 Alkylation catalyst regeneration Feb. 8, 1994
5277766 Separation of n-heptane from vinyl acetate by extractive distillation Jan. 11, 1994
5276243 Sulfolane purification method Jan. 4, 1994
5264652 Method for separating conjunct polymeric byproducts from mixture containing hydrofluoric acid and a sulfone Nov. 23, 1993
5264647 Alkylation catalyst regeneration Nov. 23, 1993
5264649 Alkylation catalyst regeneration Nov. 23, 1993
5264650 Sulfolane purification by hydrocarbon extraction Nov. 23, 1993
5264651 Method for regenerating HF/sulfolane alkylation catalyst Nov. 23, 1993
5262015 Separation of octene-1 from its isomers by azeotropic and extractive distillation Nov. 16, 1993
5262579 Separation of sulfolane from conjunct polymeric byproducts Nov. 16, 1993
5228957 Separation of methyl T-butyl ether from close boiling C.sub.5 hydrocarbons by extractive distillation Jul. 20, 1993

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