Alcohol purification process
AssigneeExxon Research & Engineering Co.
InventorHerbert W. H. Meyer, Jr.
Life of this patent
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Abstract
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.
Claims13
A process for the recovery of lower alkanol used to deash alpha-olefin polymer wherein the alkanol after deashing comprises a mixture of said alkanol, contaminates and amorphous alpha-olefin polymer which comprises adding a minor amount of water to said mixture to form a floc containing a substantial portion of said contaminates, centrifuging said mixture to remove the floc therefrom, and thereafter evaporating to recover alkanol.
Dependencies are inferred from the claim text.