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    7.
    发明专利
    未知

    公开(公告)号：DE4132894A1

    公开(公告)日：1993-04-08

    申请号：DE4132894

    申请日：1991-10-04

    Applicant: BASF AG

    Inventor： FUNK GUIDO DR ,  HEMMERICH RAINER DR ,  GROPPER HANS DR ,  KOLK ERICH DR ,  FOLLMER GODOFREDO DR

    IPC: C08F4/02 ,  C08F4/06 ,  C08F4/22 ,  C08F4/24 ,  C08F4/69 ,  C08F10/00 ,  C08F10/02

    Abstract: In a new process for the preparation of a supported catalyst for the polymerisation of alpha -olefins, first a support gel (1) is prepared by introducing a sodium water glass or potassium water glass solution into a swirling stream of an aqueous mineral acid optionally containing aluminium ions longitudinally and tangentially to the stream, spraying the resultant silicic acid hydrosol in drop form into a gaseous medium, and allowing it to solidify to form a hydrogel, and freeing the resultant hydrogel, without prior ageing, from salts by washing and optionally from some of the water by extraction with alcohols and/or ketones, and then drying the hydrogel. This gives the support gel (1), which is ground and fractionated according to particle size. In a second process step, the support gel (1) is charged with chromium trioxide or with a chromium compound which can be converted into chromium trioxide, after which the resultant chromium-containing support gel (2) is heated at from 400 to 1100 DEG C for from 10 to 1000 minutes in an anhydrous gas stream containing oxygen in a concentration greater than 10% by volume. It is essential for the process according to the invention that the drying of the hydrogel to form the support gel (1) takes place in a high-speed drier within a maximum time of 300 seconds at an inlet temperature of from 200 to 600 DEG C. The supported catalyst prepared in this way gives homopolymers and copolymers of ethylene having excellent low-temperature toughness.

    9.
    发明专利
    未知

    公开(公告)号：DE3776976D1

    公开(公告)日：1992-04-09

    申请号：DE3776976

    申请日：1987-04-03

    Applicant: BASF AG

    Inventor： MUELLER-MALL RUDOLF DR ,  FUNK GUIDO DR ,  BACHL ROBERT DR ,  HENNENBERGER PETER DR ,  KOLK ERICH DR

    IPC: C08F2/06 ,  C08F2/14 ,  C08F2/18 ,  C08F10/02 ,  C08F210/16

    Abstract: A process is claimed for the continuous prodn. of ethene homopolymer or copolymer (I) with sec. amts. of 3-8C alpha-olefins, of particle size 0.3-1.5 mm (DIN 53477) and bulk density 0.4-0.6 g/cm3 (DIN 53468), by catalytic polymerisation at 60-100 deg.C and 30-50 bar in a circular-tube reactor with 4-8C alkane as reaction medium contg. dissolved monomer(s) and suspended (I) and with a circulating reacton mixt. to which reactants are added and from which (I) is recovered by removal of mixt. The novelty is that the mean concn. of (I) (Cm) in the circulation is kept in the range 0.4-0.7 g per g reaction mxit. and that reaction mixt. is removed at a point in the cycle where the concn. of (I) is from 0.5Cm to 0.7Cm.

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