Removal of olefin monomer from olefin polymer

Details Removal of olefin monomer from olefin polymer Removal of olefin monomer from olefin polymer

1980-06-27

1982-07-20

Levin, Stanford M.

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

Synthetic resins

Removing and recycling removed material from an ongoing...

422134, 526 87, 528502, C08F 600, C08F 628

Patent

active

043407013

ABSTRACT:
A solid particulate olefin polymer containing monomer(s) dissolved therein is vigorously agitated mechanically to raise the temperature of the polymer to at least 90.degree. C. This vigorous agitation is effected in the absence of any purge gas and the unpolymerized olefin monomer desorbed from the polymer by the increase in temperature can readily be recovered and recycled to the polymerization vessel. The technique can form part of the work-up process in which the polymer is removed from the polymerization vessel and separated from unconverted monomer(s) prior to isolation. By this technique, propylene is removed from polypropylene without using a purge stream of nitrogen which makes recovery of the propylene difficult and expensive. The technique additionally heats up the polymer which can be advantageous for subsequent processing. Apparatus for effecting the process includes an agitation vessel which is connected, preferably through an intermediate separation vessel, to an olefin polymerization vessel.

REFERENCES:
patent: 2435229 (1948-02-01), Mann
patent: 3229002 (1966-01-01), Feder
patent: 3293227 (1966-12-01), Boggess et al.
Plasdoc Abstract No. 40282x.
Plasdoc Abstract No. 20426y.
Plasdoc Abstract No. 75919y.

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