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    Olefin polymerisation catalyst based on silicic acid xerogels - and contg. chromium oxide, leaving low catalyst residues in the polymer
    33.
    发明专利
    Olefin polymerisation catalyst based on silicic acid xerogels - and contg. chromium oxide, leaving low catalyst residues in the polymer 未知

    公开(公告)号：DE2540277A1

    公开(公告)日：1977-03-24

    申请号：DE2540277

    申请日：1975-09-10

    Applicant: BASF AG

    Inventor： MUELLER-TAMM HEINZ DIPL CHEM D ,  FRIELINGSDORF HANS DIPL ING DR ,  MERK GERHARD DIPL CHEM DR ,  GRUBER WOLFGANG DIPL CHEM DR

    IPC: C08F10/00

    Abstract: The catalyst is prepd. by (A) preparing a silicic acid-xerogel by (i) extracting >=60%, pref. >=90% of the water contained in a silicic acid-hydrogen contg. 10-25 (esp. 14-20)% solids (calc. as SiO2), with a 1-4C alkanol and/or a 3-5C alkanone; (ii) drying the gel from (i) at 180 degrees C/10 torr/30 mins. until there is no further wt. loss (xerogel formation); (iii) comminuting the xerogel to a dia. of 20-2000 mu, pref. 40-300 mu; (B) admixing the xerogel with solid, finely divided chromium trioxide at 100-300 degrees C/0.001-250 torr, until the xerogel takes up 0.1-10% (calc. on the xerogel and as Cr) chromium trioxide; (C) maintaining the prod. from (B) in a gas stream free from water and contg. >10 vol. % O2 at 400-1000 degrees C/10-1000 mins. The hydrogel used in (A) comprises spherical particles of dia. 1-8 (pref. 2-6)mm. The catalyst is used for the homo- and co-polymerisation of 2-8C monoolefins and esp. for ethylene in suspension or in the dry phase. It has partic. high productivity.

    Olefin polymn catalyst prepn - from silica hydrogel and chromium oxide using solvent extraction to remove water
    34.
    发明专利
    Olefin polymn catalyst prepn - from silica hydrogel and chromium oxide using solvent extraction to remove water 未知

    公开(公告)号：DE2509286A1

    公开(公告)日：1976-09-16

    申请号：DE2509286

    申请日：1975-03-04

    Applicant: BASF AG

    Inventor： FRIELINGSDORF HANS DIPL ING DR ,  GRUBER WOLFGANG DIPL CHEM DR ,  MUELLER-TAMM HEINZ DIPL CHEM D

    IPC: B01J23/26 ,  B01J37/02 ,  C08F10/00 ,  C08F4/22

    Abstract: Olefin polymsn. catalyst is prepd. by (1) prepg. a finely divided SiO2 xerogel with particle size 10-2,000 um, (2) mixing with 0.1-10 wt. % (as Cr and w.r.t. SiO2) of Cr2O3 or its precursor in soln., and (3) passing through a dry gas stream contg. >=10 vol. % O2 for 10-1000 mins. at 400-1100 degrees C. Specif. the silica xerogel is prepd. by extracting 10-25 wt. % solid silica hydrogel with dry 1-4C alkanol and/or 3-5C alkanone to remove any water, extracting further with a hydrocarbon or oxa-hydrocarbon with b. pt. of -20 to +40 degrees C at 1 atm. and a heat of vaporisation 7 k.cal/mol to remove the first solvent, and heating for 30 mins. at 120 degrees C under vacuum of 10 Toor until no more wt. loss is shown. In stage (2) the xerogel is treated with a 0.05-5 wt. % soln. of Cr2O3 in a 3-5C alkanone or a Cr2O3 precursor in a 1-4C alkanol or 3-5C alkanone, the solvent contg. =20 wt. % water, and the solvent is then evaporated. Used for Phillips polymsn. processes for 2-8C mono alpha-olefins, esp. ethylene. Residual catalyst in polymerisate is negligible. Use of H2 as mol. wt. regulator is unnecessary.

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