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    SEPARATION OF C.SUB.4-HYDROCARBON MIXTURE BY EXTRACTIVE DISTILLATION
    5.
    发明专利
    SEPARATION OF C.SUB.4-HYDROCARBON MIXTURE BY EXTRACTIVE DISTILLATION 未知

    公开(公告)号：CA1220757A

    公开(公告)日：1987-04-21

    申请号：CA470880

    申请日：1984-12-21

    Applicant: BASF AG

    Inventor： LINDNER ALFRED ,  VOLKAMER KLAUS ,  HOFFMANN HERWIG ,  SANDROCK GERHARD

    IPC: C07C1/00 ,  C07C7/04 ,  C07C7/08 ,  C07C9/10 ,  C07C11/08 ,  C07C67/00

    Abstract: A C4-hydrocarbon mixture which contains hydrocarbons which are more readily soluble in the selective solvent and those which are more sparingly soluble in the said solvent is separated with the aid of a selective solvent by a process in which the C4-hydrocarbon mixture is separated, in an extractive distillation zone, into a top product (distillate), which contains the more sparingly soluble hydrocarbons, and an extract containing the more readily soluble hydrocarbons and the selective solvent, the extract taken off as the bottom product is fed to a solvent recovery zone, in which the extract is separated into a product containing the hydrocarbons, and the selective solvent which has been partially or completely freed from the hydrocarbons, and the concentration, based on the C4-hydrocarbon/selective solvent mixture formed in the extractive distillation zone, of the selective solvent in the said zone falls below 75% by weight on one or more trays or, in the case of packed extractive distillation columns, at one or more points within the packing.

    PROCESS FOR OBTAINING ISOBUTENE FROM C4-HYDROCARBON MIXTURES CONTAINING ISOBUTENE
    6.
    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.

    SEPARATION OF A C.SUB.4-HYDROCARBON MIXTURE ESSENTIALLY CONTAINING N-BUTENES AND BUTANES
    7.
    发明专利
    SEPARATION OF A C.SUB.4-HYDROCARBON MIXTURE ESSENTIALLY CONTAINING N-BUTENES AND BUTANES 未知

    公开(公告)号：CA1222258A

    公开(公告)日：1987-05-26

    申请号：CA455081

    申请日：1984-05-24

    Applicant: BASF AG

    Inventor： LINDNER ALFRED ,  BROELLOS KLAUS ,  SANDROCK GERHARD ,  VOLKAMER KLAUS ,  HEFNER WERNER

    IPC: C07C1/00 ,  C07C7/17 ,  C07C9/10 ,  C07C11/08 ,  C07C67/00

    Abstract: The invention relates to a process for the separation of a C4-hydrocarbon mixture which essentially contains n-butenes and butanes. This process is characterized in that the mixture is reacted with a carboxylic acid in the presence of an acidic catalyst to form a butyl carboxylate; the reaction mixture obtained from the esterification zone is distilled to give, as the top product, a fraction containing the butanes, and, as the bottom product, a fraction containing the resulting butyl carboxylate; the butyl carboxylate is decomposed at elevated temperatures to give the carboxylic acid and n-butenes; and the mixture of n-butenes and carboxylic acid is then distilled, the n-butenes being obtained as the top product, and the carboxylic acid as the bottom product. This process permits to use apparatus that are less expensive than those required for the conventional extractive distillation method.

    OBTAINING A CONJUGATED DIOLEFIN FROM A MIXTURE OF C.SUB.4 OR C.SUB.5 HYDROCARBONS
    9.
    发明专利
    OBTAINING A CONJUGATED DIOLEFIN FROM A MIXTURE OF C.SUB.4 OR C.SUB.5 HYDROCARBONS 未知

    公开(公告)号：CA1182774A

    公开(公告)日：1985-02-19

    申请号：CA402343

    申请日：1982-05-05

    Applicant: BASF AG

    Inventor： BROELLOS KLAUS ,  VOLKAMER KLAUS ,  LINDNER ALFRED

    IPC: C10G7/08 ,  B01D3/40 ,  C07C1/00 ,  C07C7/08 ,  C07C11/12 ,  C07C67/00 ,  C10G21/28

    Abstract: A process for obtaining a conjugated diolefin from a mixture of C4 or C5 hydrocarbons which contains this diolefin, by single-stage or multistage extractive distillation using a selective solvent and recycling the latter to the extractive distillation, after it has been obtained from the stripping zone downstream from each extractive distillation, a bleed stream of the recycled selective solvent being regenerated in a solvent purification stage in which the high-boiling or non-volatile impurities present in the solvent are separated off, and the regenerated solvent obtained from the solvent purification stage also being recycled, which process comprises regenerating the solvent in a thin-film evaporation zone.

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