Alcohol purification process
 In the clean-up and recovery of isopropanol used to deash polypropylene prepared by the polymerization of propylene in the presence of a TiCl.sub.3.AlCl.sub.3 catalyst, the neutralized bottoms from the first stage of a two stage evaporization of isopropanol are deashed by adding a small quantity of water, which causes flocculation of a substantial portion of the ash in the bottoms which are separated from liquids in the system by centrifuging, with the centrate going to the second stage evaporization in which substantially only amorphous polypropylene is left as bottoms. 
Exxon Research and Engineering Company
C
C08J
inventional
Herbert W. H.
Meyer, Jr.