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    PROCESS FOR OBTAINING ISOBUTENE FROM C.SUB.4-HYDROCARBON MIXTURES CONTAINING ISOBUTENE
    1.
    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.

    PROCESS FOR OBTAINING ISOBUTENE FROM C4-HYDROCARBON MIXTURES CONTAINING ISOBUTENE
    2.
    发明专利
    PROCESS FOR OBTAINING ISOBUTENE FROM C4-HYDROCARBON MIXTURES CONTAINING ISOBUTENE 未知

    公开(公告)号：CA1115737A

    公开(公告)日：1982-01-05

    申请号：CA318369

    申请日：1978-12-21

    Applicant: BASF AG

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

    IPC: B01J31/00 ,  C07B61/00 ,  C07C1/00 ,  C07C7/148 ,  C07C11/09 ,  C07C41/36 ,  C07C41/42 ,  C07C67/00

    Abstract: A process for obtaining isobutene from a C4-hy-drocarbon mixture containing isobutene, which comprises (a) reacting the mixture 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 C4-hydro-carbon mixture, with or without prior mixing, to an etherification reaction zone which contains the ion exchanger; (b) 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 such top product being substantially free from isobutene and the primary C3- or C4-al-cohol and taking off as the bottom product the resulting C3or C4-alkyl tert.-butyl ether, which may contain therein primary C3- or C4-alcohol which may have been added in excess; (c) 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; (d) feeding the mixture of isobutene and primary C3- and C4-alcohol produced in step (c) to a second distillation zone, taking off as the top product isobutene and as the bottom product the remaining C3- or C4-alcohol produced in step (c); and (e) recyoling the primary C3- or C4-alcohol which is the bottom product of step (d) to the etherification reaction zone.

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