Removal of residual catalyst from polyolefin polymers

Details Removal of residual catalyst from polyolefin polymers Removal of residual catalyst from polyolefin polymers

1979-03-16

1981-07-14

Henderson, C. A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

26034818, 422139, 528483, 528495, 528496, 528499, C08F 602, C08F 608

Patent

active

042787882

ABSTRACT:
An improved method for reducing the halogen content of a particulate polyolefin formed by catalytic polymerization of an olefin in the presence of a Ziegler-Natta catalyst is taught which comprises the steps of causing the polyolefin in the dry state to flow into a gas phase fluidized bed, contacting the polyolefin in the fluidized bed with a gas comprising 0.05% to 0.2% alkylene oxide, 5% to 30% water, and the balance inert gas such that the alkylene oxide reacts with halogens present in the polyolefin to form an alkylene halohydrin, removing the alkylene halohydrin from the fluidized bed and thus reducing the halogen content of the polyolefin. The improvement comprises regenerating the alkylene oxide by contacting the inert gas containing alkylene halohydrin with a caustic solution in alcohol or water and recovering therefrom alkylene oxide formed by the reaction of the alkylene halohydrin and the caustic solution.

REFERENCES:
patent: 3644321 (1972-02-01), Koga
patent: 4117219 (1978-09-01), Kakogawa

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