abstract |
ZIEGLER CATALYSTS ARE REACTIVATED AFTER THE CATALYSTS ARE EITHER PARTIALLY OR PREFERABLY COMPLETELY INACTIVE BY THE ADDITION OF A VARIETY OF REACTIVATORS, NOTABLY SULFUR COMPOUNDS, SUCH AS THIONYL CHLORIDE. THE PREFERRED PROCESS COMPRISES AT LEAST THREE SERIALLY CONNECTED REACTORS WHEREIN THE REACTIVATORS ARE CONTINUOUSLY ADDED TO ALL BUT THE FIRST REACTOR. |