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PROCESS FOR THE PREPARATION OF A CATALYST OF THE ZIEGLER-NATTA TYPE BASED ON A COMPANION OF VANADIO AND USE OF THIS CATALYST
PROCESS FOR THE PREPARATION OF A CATALYST OF THE ZIEGLER-NATTA TYPE BASED ON A COMPANION OF VANADIO AND USE OF THIS CATALYST
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机译:基于VANADIO的齐格勒-纳塔型催化剂的制备方法和该催化剂的使用
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摘要
The present invention relates to a process for preparing a Ziegler-Natta type catalyst based on a vanadium compound. The process comprises sequentially contacting within a liquid hydrocarbon a spheroidal support comprising (i) MgCl2 free from any Mg-C bond and (ii) an electron-donor DI free from labile hydrogen, an electron-donor D2 containing labile hydrogen and an organometallic compound capable of reducing a vanadium compound, (2) washing the solid product with a liquid hydrocarbon resulting from the contacting, and (3) contacting the washed solid product with one or more vanadium compounds soluble in the liquid hydrocarbon, comprising halogen atoms and alkoxy radical, both being bonded to the same or different vanadium atoms. The catalyst which consists of spheroidal particles without fines, is very active in olefin polymerization and is particularly suitable for producing elastomeric copolymers of propylene.
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