Patent ID: 6025534
Filing Date: 2000-02-15
Classification: C07C,C08F,C10G,Y02P

Abstract:
A process for the polymerization of olefins using a fixed bed of solid acid catalyst which comprises:(a) contacting a first olefin-containing feedstock with the fixed bed of solid acid catalyst under olefin polymerization conditions by passing the first feedstock into the fixed bed and withdrawing a product stream from the fixed bed, wherein the mole ratio of olefins to aromatic compounds in said first feedstock is at least about 12, and whereby the acid catalyst undergoes deactivation with the passage of time;(b) substituting a second olefin-containing feedstock for the first feedstock after the acid catalyst has become partially deactivated, wherein the second feedstock contains aromatic compounds and the mole ratio of olefins to aromatic compounds in said second feedstock is in the range from about 1 to about 10;(c) contacting the second feedstock with the fixed bed of solid acid catalyst under olefin polymerization conditions by passing the second feedstock into the fixed bed and withdrawing a product stream from the fixed bed; and(d) passing the second feedstock into the fixed bed and withdrawing said product stream from the fixed bed for a period of time which is effective to produce a regenerated acid catalyst which has an increased activity relative to that at the beginning of step (b).