中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

36 records (took 0.02 seconds)

    7.
    发明专利
    未知

    公开(公告)号：DE2509261A1

    公开(公告)日：1976-09-23

    申请号：DE2509261

    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: C08F4/00 ,  C08F4/06 ,  C08F10/00

    Abstract: A process for the manufacture of olefin polymers by polymerization of monoolefins using a silicic xerogel/chromium trioxide catalyst obtained by (1) synthesizing a particulate silicic xerogel, (2) doping said xerogel with chromium trioxide or a chromium compound capable of converting to chromium trioxide under the conditions of stage (3) and (3) heating the resulting product in a gas stream containing oxygen. The silicic xerogel/chromium trioxide catalyst used is one which has been obtained by (1) synthesizing the silicic xerogel in the first stage by (1.1) starting with a silicic hydrogel having a relatively high solids content, (1.2) extracting water from said hydrogel by means of an alkanol and/or alkanone until the organic liquid absorbs no further water, (1.3) extracting the organic liquid used in stage (1.2) from the resulting dehydrated gel saturated with said organic liquid by means of a hydrocarbon or oxohydrocarbon until said hydrocarbon or oxohydrocarbon absorbs no further organic liquid from stage (1.2), and (1.4) drying the resulting dehydrated gel saturated with hydrocarbon or oxohydrocarbon (xerogel formation), and (2) doping said xerogel in the second stage with the desired amount of chromium from a solution of chromium trioxide in an alkanone or solution of a chromium compound capable of converting to chromium trioxide under the conditions of stage (3) in an alkanol or alkanone with evaporation of the solvent.

    Olefin polymn catalyst - made by heating silicic acid xerogel with solid chromium trioxide
    8.
    发明专利
    Olefin polymn catalyst - made by heating silicic acid xerogel with solid chromium trioxide 未知

    公开(公告)号：DE2411711A1

    公开(公告)日：1975-09-25

    申请号：DE2411711

    申请日：1974-03-12

    Applicant: BASF AG

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

    IPC: C08F4/22 ,  C08F10/00

    Abstract: Polyolefins are made by polymerising 2-8 C alpha-mono-olefins at 60-160 degrees C and olefin pressures of 0.5-40 bar using silicic acid xerogel/CR2O3 catalysts made by (1) forming a finely divided silica xerogel with a particle size of 10 to 2000 mu m by (a) making a 10-25 wt. % solids (as SiO2) silicic acid hydrogel, (b) extracting water from the hydrogel with a 1-4 C alkanol and/or a 3-5 C alkanone until the org. liq. takes up no more water and (c) drying the dewatered gel, saturated with the org. liq. until no further wt. loss occurs on heating at 180 degrees C/10 Torr for 30 mins.; (2) mixing the resulting xerogel with solid, finely divided CR2O3 and heating at 100-300 degrees C/0.01-250 Torr until the xerogel has taken up 0.1-10 wt. % CR2O3 (calculated as Cr) and (3) treating the prod. for 10-1000 min. at 40-1100 degrees C in a moisture-free gas stream contg. >10 vol. % O2. The catalysts give high yields and high productivity, and the resulting polymers have relatively narrow particle size distribution, low fines content and a sufficiently high melt index when made in the absence of mol. wt. regulators.

Patent Agency Ranking