IMPROVED PROCESS FOR PREPARING POLYTETRAHYDROFURAN

    公开(公告)号:CA2273265C

    公开(公告)日:2005-06-21

    申请号:CA2273265

    申请日:1997-11-18

    Applicant: BASF AG

    Abstract: Polytetrahydrofuran, tetrahydrofuran copolymers, diesters or monoesters of these polymers are prepared by polymerizing tetrahydro- furan in the presence of at least one telogen and/or comonomer on a heterogeneous carrier catalyst which contains on an oxidic carrier material as active mass a catalytically active amount of at least one oxygenous molybdenum and/or tungsten compound and, when the precursor compounds of the active mass have been applied to the carrier material precursor, has been calcined at temperatures of between 500 .degree.C and 1000 .degree.C. The catalyst used contains a promotor whic h comprises at least one element or a compound of an element of the 2nd, 3rd including the lanthanides, 5th, 6th, 7th, 8th or 14th group of the periodic system of elements.

    CATALYST AND METHOD FOR PRODUCING POLYTETRAHYDROFURAN

    公开(公告)号:MY118608A

    公开(公告)日:2004-12-31

    申请号:MYPI9805594

    申请日:1998-12-10

    Applicant: BASF AG

    Abstract: IN A PROCESS FOR PREPARING POLYTETRAHYDROFURAN, POLYTETRAHYDROFURAN COPOLYMERS ORDIESTERS OR MONOESTERS THEREOF BY POLYMERIZATION OF TETRAHYDROFURAN IN THE PRESENCE OF AT LEAST ONE TELGEN AND/OR COMONOMER OVER ACID- ACTIVATED MONTMORILLONITE CATALYSTS, THE MONTMORILLONITE CATALYST AFTER ACID ACTIVATION HAS A RATIO OF MONTMORILLONITE STRUCTURE TO THE SUM OF MUSCOVITE AND KAOLIN STRUCTURES, DETERMINED FROM THE INTENSITIES OF THE REFLECTIONS AT 20= 5.5o FOR MONTMORILLONITE, 20=9.0o FOR KAOLIN MEASURED IN THE X-RAY POWDER PATTERN, OF AT LEAST 5:1.

    9.
    发明专利
    未知

    公开(公告)号:DE50003718D1

    公开(公告)日:2003-10-23

    申请号:DE50003718

    申请日:2000-01-20

    Applicant: BASF AG

    Abstract: A process for working up at least partially deactivated polymerization catalysts for the polymerization or copolymerization of THF which are contaminated with the products of the polymerization or copolymerization of THF comprises(a) in a first step, cleaning the polymerization catalyst by treatment with steam at from 80 to 250° C. and a pressure of from 0.5 to 40 bar and, preferably,(b) in a second step, regenerating the clean polymerization catalyst.

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