专利名称：Process for the preparation of ethylene
polymers
发明人：SCHULZE, KURT申请号：EP78100534.3申请日：19780728公开号：EP0000748A1公开日：19790221
摘要：The process involves polymerisation of the monomer at elevated temperaturein a saturated hydrocarbon which is liquid under the process conditions and in which boththe monomer and the polymer formed are soluble, by means of a chromium oxidesupported catalyst which is obtained from a catalyst precursor (which is itself a silicondioxide-based, finely particulate support which is homogeneously coated with a
chromium compound) by (1) treating the catalyst precursor (if necessary with addition ofa promoter) at elevated temperature with an oxygen-containing gas, and then (2)allowing carbon monoxide to act on the product obtained from step (1). The process ischaracterised in that the chromium oxide supported catalyst employed is prepared fromthe catalyst precursor by using, in both steps (1) and (2), the solid in the form of afluidised bed which is maintained by a carrier gas stream, with the provisos that (1) in step(1) the oxygen treatment is carried out at a temperature of from 400 to 1500 DEG C for atime of at least 30 minutes, and (2) in step (2) the carbon monoxide treatment is carriedout at a temperature of from 250 to 500 DEG C for a time of from 0.5 to 3 hours bymeans of anhydrous and oxygen-free gas which comprises nitrogen to which a total offrom 100 to 1000 mol%, based on the chromium trioxide content of the product
obtained from step (1), of carbon monoxide is added, distributed evenly over the totalcarbon monoxide treatment time.
申请人：SCHULZE, KURT
地址：Kastanienweg 20 D-5047 Wesseling DE
国籍：DE
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