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Class Information
Number: 585/867
Name: Chemistry of hydrocarbon compounds > Purification, separation, or recovery > By addition of extraneous agent, e.g., solvent, etc. > Organic agent > Hydrocarbon
Description: Subject matter wherein an agent contains only carbon and hydrogen in its molecule.










Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
5849979 Process for cooling a hot vapor effluent of a hydrocarbon dehydrogenation zone and removing trace quantities of polynuclear aromatic compounds Dec. 15, 1998
5849983 Prevention of shearing of hydrocarbon droplets to aerosol sizes Dec. 15, 1998
5840160 Separation of 3-carene from limonene by extractive distillation Nov. 24, 1998
5811607 Composite shingle particle salvage system Sep. 22, 1998
5789647 Process for the extraction of natural carotenoid dyes Aug. 4, 1998
5720857 Separation of 1,2,4-trimethylbenzene from 1,2,3-trimethylbenzene by azeotropic distillation Feb. 24, 1998
5710357 Process for recovering olefins from cat-cracked gas without accumulating undesirable oxides of nitrogen Jan. 20, 1998
5675055 Acidification/extraction treatment of waste caustic stream Oct. 7, 1997
5605606 Removal foulants from distillation train using non-solvent precipitation Feb. 25, 1997
5510568 Process for the removal of mercaptans and hydrogen sulfide from hydrocarbon streams Apr. 23, 1996
5502971 Low pressure recovery of olefins from refinery offgases Apr. 2, 1996
5481060 Process for the removal of heavy hydrocarbonaceous co-products from a vapor effluent from a normally gaseous hydrocarbon dehydrogenation reaction zone Jan. 2, 1996
5476986 Method for cleaning a mixture of air and vapor from volatile crude oil with recovery of the hydrocarbons, and a system for use in the method Dec. 19, 1995
5444176 Process for recovering olefins from cat-cracked gas without accumulating undesirable oxides of nitrogen Aug. 22, 1995
5399244 Process to recover benzene from mixed hydrocarbons by extractive distillation Mar. 21, 1995
5382745 Separating vinylcyclohexene from a butadiene extracting solvent Jan. 17, 1995
5354475 Process for separating polar and non-polar constituents from coal tar distillates Oct. 11, 1994
5352336 Removal of low-boiling fractions from high temperature heat transfer systems Oct. 4, 1994
5322927 Method for producing polymers Jun. 21, 1994
5288370 Process for the separation of butenes and butanes by extractive distillation Feb. 22, 1994
5284991 Cyanide removal from oily solid using a solvent extraction process Feb. 8, 1994
5256258 Removal of low-boiling fractions from high temperature heat transfer systems Oct. 26, 1993
5250157 Separation of toluene from methyl isobutyl ketone by azeotropic distillation Oct. 5, 1993
5191150 Method for separating conjunct polymeric byproducts from mixture containing hydrofluoric acid and a sulfone Mar. 2, 1993
5162597 Olefin disproportionation and application thereof Nov. 10, 1992
5146042 Desulfurization of light olefins Sep. 8, 1992
5135620 Separation of ethylbenzene from xylenes by extractive distillation Aug. 4, 1992
5127962 Method for cleaning apparatus used for measuring dissolved gas in oil Jul. 7, 1992
5122236 Method for removal of dimethyl ether and methanol from C.sub.4 hydrocarbon streams Jun. 16, 1992
5120899 Diamondoid recovery from natural gas fields Jun. 9, 1992
5100515 Separation of alkenes from close-boiling alkanes Mar. 31, 1992
5085741 Extractive distillation of low boiling alkene/alkane mixtures Feb. 4, 1992
5055162 Extractive distillation of cycloalkane/alkane feeds Oct. 8, 1991
5055178 Process for extraction of water mixed with a liquid fluid Oct. 8, 1991
5034118 Non-oxidative removal of hydrogen sulfide from gaseous, petrochemical, and other streams Jul. 23, 1991
5012034 Process for separating styrene from styrene-containing hydrocarbon streams Apr. 30, 1991
5004862 Process for recycling and purifying condensate from a hydrocarbon or alcohol synthesis process Apr. 2, 1991
4985083 Method for decontaminating a material and an assembly for carrying out said method Jan. 15, 1991
4982049 Purification of hydrocarbonaceous fractions Jan. 1, 1991
4962276 Process for removing mercury from water or hydrocarbon condensate Oct. 9, 1990
4962274 Process for separating alkyl-substituted naphthalene derivatives using clathrate complexes Oct. 9, 1990
4955468 Separation of hydrocarbon mixtures Sep. 11, 1990
4954224 Extractive distillation of hydrocarbon feeds employing mixed solvent Sep. 4, 1990
4952749 Removal of diamondoid compounds from hydrocarbonaceous fractions Aug. 28, 1990
4952747 Removal of diamondoid compounds from hydrocarbonaceous fractions Aug. 28, 1990
4952748 Purification of hydrocarbonaceous fractions Aug. 28, 1990
4948472 Extractive distillation of hydrocarbon mixtures employing mixed solvent Aug. 14, 1990
4948470 Extractive distillation of alkane/cycloalkane feed employing mixed solvent Aug. 14, 1990
4946560 Process for separating alpha and internal olefins Aug. 7, 1990
4931145 Separation of benzene from acetone by azeotropic distillation Jun. 5, 1990

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