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    CONTINUOUS PROCESS FOR PRODUCING ISOBUTYLEN POLYMERS
    21.
    发明专利
    CONTINUOUS PROCESS FOR PRODUCING ISOBUTYLEN POLYMERS 未知

    公开(公告)号：DE3362476D1

    公开(公告)日：1986-04-10

    申请号：DE3362476

    申请日：1983-12-27

    Applicant: BASF AG

    Inventor： BRONSTERT KLAUS DR ,  NICKL JOHANN DR ,  KRAUSE HANS-JOACHIM DR ,  SCHMITT WERNER

    IPC: C08F2/00 ,  C08F2/04 ,  C08F2/06 ,  C08F8/00 ,  C08F10/10

    Abstract: Isobutylene polymers are prepared continuously, in aliphatic C3-C6-hydrocarbons in the presence of soluble cationic polymerization initiators and coinitiators at from -40 DEG to 40 DEG C. and under from 0.01 to 10 bar, and the solvents and monomers vaporized during the polymerization are recycled, by a process in which the liquid stream of the monomer solution, containing 40-95, in particular 50-85, percent by weight of the monomers, the liquid streams of the recycle and of the coinitiator solution and the separate stream of the initiator solution are combined in a first zone containing the polymerization zone, and the resulting polymer solution is taken off continuously through a second zone vertically below the first zone. The liquid streams of the monomer solution, the coinitiator solution and the recycle can furthermore be fed into the first zone separately from one another.

    23.
    发明专利
    未知

    公开(公告)号：DE50104555D1

    公开(公告)日：2004-12-23

    申请号：DE50104555

    申请日：2001-07-27

    Applicant: BASF AG

    Inventor： KROKER RUPRECHT ,  NESTLER GERHARD ,  SCHMITT WERNER ,  SCHUMM WINFRIED

    IPC: B01J19/26 ,  C07B61/00 ,  C07C67/04 ,  C07C69/14 ,  C07C69/54

    Abstract: The tert-butyl ester of an aliphatic C1-C4-carboxylic acid is prepared by reacting the carboxylic acid with isobutene in the liquid phase in the presence of an acidic catalyst by a continuous process in which the reaction is carried out in a reactor divided into a plurality of sections, the carboxylic acid, the isoolefin and the catalyst are fed into the first section of the reactor, the reaction mixture obtained is removed from the last section of the reactor and the ester is isolated therefrom, the reaction temperature in the reactor being controlled so that it is from 10 to 40° C. and is highest in the first section of the reactor. The novel process permits the technically simple, economical and environmentally friendly preparation of tertiary butyl esters of saturated and unsaturated C1-C4-carboxylic acids.

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