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    PROCESS FOR OBTAINING ISOBUTENE FROM C.SUB.4-HYDROCARBON MIXTURES CONTAINING ISOBUTENE
    18.
    发明专利
    PROCESS FOR OBTAINING ISOBUTENE FROM C.SUB.4-HYDROCARBON MIXTURES CONTAINING ISOBUTENE 未知

    公开(公告)号：CA1142554A

    公开(公告)日：1983-03-08

    申请号：CA355096

    申请日：1980-06-30

    Applicant: BASF AG

    Inventor： BRUNNER ERWIN ,  SCHUBERT ECKART ,  LINDNER ALFRED ,  MERGER FRANZ ,  VOLKAMER KLAUS ,  SANDROCK GERHARD ,  STROHMEYER MAX

    IPC: C07C1/00 ,  C07C7/148 ,  C07C11/09 ,  C07C41/06 ,  C07C67/00

    Abstract: The present invention is concerned with a process for obtaining isobutene from a C4-hydrocarbon mixture containing isobutene, which comprises the steps for reacting the mixture continuously with a primary C3-or C4-alcohol in the presence of an ion exchanger in its acid form as a condensing agent to form the corresponding C3- or C4-alkyl tert-butyl ether by feeding the primary C3- or C4-alcohol and the C4hydrocarbon mixture with or without prior mixing, to an etherification reaction zone which contains the ion exchanger, while maintaining the exit temperature of the reaction mixture from the etherification reaction zone at from 25 to 65.degree.C and the quotient of the volume of the etherification reaction zone and the throughput of the C4-hydrocarbon mixture and the primary C3- or C4-alcohol at from 0.01 to 5 hours; distilling the reaction mixture obtained from the etherification reaction zone in a first distillation zone, taking off as the top product without water washing a C4-hydrocarbon mixture comprising the unconverted hydrocarbons and not more than 1,000 ppm by weight of the primary C3- or C4-alcohol and taking off as the bottom product the resulting C3- or C4alkyl tert-butyl ether, which may contain therein primary C3- or C4-alcohol which may have been added in excess; feeding the bottom product to a second reaction zone, containing an acid catalyst, in which the C3- or C4-alkyl tert-butyl ether is decomposed at an elevated temperature to give isobutene and primary C3- and C4-alcohol; feeding the mixture of isobutene and primary C3- and C4-alcohol produced in the decomposition step to a second distillation zone, taking off as the top product without a water wash isobutene containing not more than 500 ppm by weight of primary C3-or C4alcohol and taking off as the bottom product the remaining primary C3- or C4-alcohol produced in step (c); and recycling the primary C3- or C4-alcohol which is the bottom product of step (d) to the etherification reaction zone.

    Production of p-dialkylbenzenes
    20.
    发明专利
    Production of p-dialkylbenzenes 未知

    公开(公告)号：GB1109578A

    公开(公告)日：1968-04-10

    申请号：GB3721166

    申请日：1966-08-19

    Applicant: BASF AG

    Inventor： STROHMEYER MAX ,  HILLER KARL ,  SCHOLZ HEINRICH ,  KINDLER HUBERT

    IPC: C07C2/70

    Abstract: p-Dialkylbenzenes are produced by reaction of alkylbenzenes and olefins in the presence of an AlCl3/HCl catalyst also containing an aromatic hydrocarbon having a carbon-carbon double bond situated in conjugation to a benzene nucleus (which for convenience of definition is assumed to contain 3 conjugated double bonds). Suitable aromatic hydrocarbons include styrene, anthracene, 2 - phenyl - cyclohexene and 1,1,3-trimethyl - 5 - isopropylindene, others also being mentioned. m- and o-dialkylbenzenes and higher alkylated by-products may be transalkylated, e.g. with benzene or an alkylbenzene in the presence of a Friedel-Crafts catalyst. The examples are all directed to the production of p-diisopropylbenzene from cumene and propylene. In Example 6, the aromatic hydrocarbon catalyst component is 1,1,3-trimethyl-5-isopropyl-indene, and the process is carried out continuously in three vessels, in the first of which tri-isopropylbenzene by-product is transalkylated with benzene in the presence of AlCl3/HCl catalyst, a small amount of 1,1,3-trimethyl-5-isopropyl-indene being produced simultaneously, the whole mixture from this vessel then being passed to a second vessel together benzene, m-dialkylbenzene, AlCl3/HCl catalyst and o- and m-dialkylbenzene by-product further transalkylation taking place, and the cumene-propylene alkylation reaction taking place in the presence of the reaction mixture from the second vessel, by-products being separated and recycled to the first, second and third vessel as appropriate.

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