C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
252/39, 402/631
C08F 4/18 (2006.01) B01J 21/08 (2006.01) B01J 23/26 (2006.01) C08F 4/24 (2006.01) C08F 10/00 (2006.01)
Patent
CA 1137961
Abstract A method of preparing large pore volume zir- conia-silica catalyst supports, the resulting supports and a method of polymerizing olefins comprising con- tacting an olefin or mixture of olefins with a cata- lyst prepared with these supports. The supports are prepared by reacting a zirconium compound of the formula M4Zr(C2)4)4?nH2O, where M is an alkali metal or ammonium ion and n equals 0 to 10, with a silicon compound of the type A2SiO3, where A is an alkali metal, in an aqueous solution at a pH equal to at least 11, then adding an acidic solution to a pH of about 5-9 to produce a hydrocogel. The hydrocogel is then aged and washed free of soluble by-products first with water, then with aqueous ammonium nitrate and again with water. The water is removed from the washed hydrocogel by azeotropic distillation or by washing with a water miscible solvent, then residual water is removed by chemically reacting this water with a ketal of the formula RC(OR)2R where R is the same or different and is an alkyl group of 1-5 carbon atoms, and then calcining the resulting xero- cogel.
371111
Equistar Chemicals Lp
Meredith & Finlayson
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