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Class Information
Number: 585/808
Name: Chemistry of hydrocarbon compounds > Purification, separation, or recovery > By plural serial diverse separations > To recover aromatic > Including steps of distillation and agent addition > Agent contains n, carbonyl, or dihydroxy moiety
Description: Subject matter in which the agent added in a purification step contains nitrogen or the keto -C--C moiety or the aldehyde -C=O moiety or has two hydroxyl groups.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8536397 Recovery of benzene and benzene derivatives from gasoline fraction and refinery streams Sep. 17, 2013
8362313 Processes and systems for recovery of styrene from a styrene-containing feedstock Jan. 29, 2013
6960279 Method for stabilizing vinyl aromatic monomers using selected polymerization inhibitors and polymers prepared therewith Nov. 1, 2005
6664433 Process for the purification of aromatic hydrocarbons and process for the preparation of high-purity aromatic hydrocarbons Dec. 16, 2003
6395953 Process for preparing purified conjugated diene May. 28, 2002
6392115 Separation of hydrocarbons by extractive distillation May. 21, 2002
6100439 Styrene caustic wash extraction aid Aug. 8, 2000
5972172 Separation of 1,2,4-trimethylbenzene from 1,2,3-trimethylbenzene by extractive distillation Oct. 26, 1999
5877385 Process including extractive distillation and/or dehydrogenation to produce styrene from petroleum feedstock including ethyl-benzene/xylene mixtures Mar. 2, 1999
5865958 Method for separating cyclohexene Feb. 2, 1999
5849982 Recovery of styrene from pyrolysis gasoline by extractive distillation Dec. 15, 1998
5723026 Process for recovering pure benzene and pure toluene from aromatic hydrocarbon products Mar. 3, 1998
5458741 Separation of benzene from close boiling hydrocarbons by extractive distillation Oct. 17, 1995
5453167 Separation of xylenes by extractive distillation Sep. 26, 1995
5441608 Separation of xylenes by extractive distillation Aug. 15, 1995
5425855 Separation of ethyl benzene from p-xylene by extractive distillation Jun. 20, 1995
5399244 Process to recover benzene from mixed hydrocarbons by extractive distillation Mar. 21, 1995
5397441 Separation of ethyl benzene from o-xylene by extractive distillation Mar. 14, 1995
5238540 Method of obtaining a pure aromatic hydrocarbon from a sump product of an extractive distillation of a hydrocarbon mixture Aug. 24, 1993
5234553 Process for obtaining a pure hydrocarbon from a sump product of an extractive distillation Aug. 10, 1993
5215629 Method of separating aromatics from a hydrocarbon mixture having an aromatic content Jun. 1, 1993
5202520 Method for aromatic hydrocarbon recovery Apr. 13, 1993
5180474 Method of separation of aromates by extractive distillation Jan. 19, 1993
5135617 Separation of aromatic from olefinic hydrocarbons by extractive distillation Aug. 4, 1992
5107055 Method for simultaneous recovery of pure benzene and pure toluene Apr. 21, 1992
5073669 Method for aromatic hydrocarbon recovery Dec. 17, 1991
4997547 Method for the production of an aromate concentrate suitable for use as blending component for fuel Mar. 5, 1991
4959128 Separation of styrene from ethyl benzene by extractive distillation Sep. 25, 1990
4933499 Process for purification of alkenyl aromatic compounds containing a benzaldehyde impurity Jun. 12, 1990
4925535 Process for the production of an aromate concentrate suitable for use as blending component for gasification fuel May. 15, 1990
4904346 Separation of m-diisopropyl benzene from p-diisopropyl benzene by extractive distillation Feb. 27, 1990
4836896 Separation of m-diisopropylbenzene from p-diisoproylbenzene by azeotropic distillation with acetophenone Jun. 6, 1989
4776927 Process for the separation of aromatic hydrocarbons from a hydrocarbon mixture Oct. 11, 1988
4676875 Separation of m-xylene from o-xylene by extractive distillation Jun. 30, 1987
4664783 Method for the separation of aromates from hydrocarbon mixtures containing aromatics May. 12, 1987
4586986 Method of recovering pure aromatic substances May. 6, 1986
4421607 Process for extractive distillation of plural hydrocarbon mixtures Dec. 20, 1983
4371428 Separating vinyltoluene from other alkenylaromatics Feb. 1, 1983
4341600 Polymerization inhibitor for vinyltoluene Jul. 27, 1982
4316796 Process for the separation of dienic and/or aromatic hydrocarbons present in hydrocarbon fractions Feb. 23, 1982
4306945 Extracting aromatic hydrocarbons from mixtures containing same Dec. 22, 1981
4299667 Process for recovering pure benzene Nov. 10, 1981
4280881 Separating indene from unsaturated alkylaromatics Jul. 28, 1981
4277314 Isolation of 1,3-butadiene from a C4-hydrocarbon mixture Jul. 7, 1981
4252615 Polymerization inhibitor for vinyl aromatic compounds Feb. 24, 1981
4237330 Isolation of butadiene from a C.sub.4 -hydrocarbon mixture Dec. 2, 1980
4201633 Separating aromatic hydrocarbons from mixtures containing them May. 6, 1980
4132602 Polymerization inhibitor for vinyl aromatic compounds Jan. 2, 1979
4098838 Process for obtaining sulfur free pure naphthalene from bituminous coal tar and thionaphthene as a by-product Jul. 4, 1978
4081355 Process for recovering highly pure aromatics from a mixture of aromatics and non-aromatics Mar. 28, 1978

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