Removal of olefin monomer from olefin polymer

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

1982-12-16

1988-11-01

Marcus, Michael S.

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Organic polymerization

422135, 422234, 528202, B01J 808

Patent

active

047818964

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.

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patent: 4199546 (1980-04-01), Kirch
patent: 4291132 (1981-09-01), Clifford
Perrys'-Chemical Engineers Handbook, 4th Ed., pp. 13-49 to 13-50.
Azeotropic Data III, Horsley, p. 35, 1974.

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