Method for continuous soluble polypropylene recovery from hydroc

Details Method for continuous soluble polypropylene recovery from hydroc Method for continuous soluble polypropylene recovery from hydroc

1976-08-09

1978-07-04

Levin, Stanford M.

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

Synthetic resins

Treating polymer containing material or treating a solid...

260 336UA, 260676R, 526351, 528503, C08F 612

Patent

active

040989925

ABSTRACT:
Polypropylene is recovered from a dilute solution in spent organic polymerization medium in a process comprising: (1) partial steam stripping of volatile components from said medium to form an aqueous phase and a concentrated, water-insoluble phase containing the soluble polypropylene: (2) separating said concentrated water-insoluble phase and leading it into an evaporator: (3) evaporating the remaining volatile components from the separated said water-insoluble phase leaving fluidized polypropylene which when drawn off and solidified is suitable for commercial use.

REFERENCES:
patent: 2801234 (1957-07-01), Hanson
patent: 3234995 (1960-02-01), Van Den Berg et al.
patent: 3296240 (1967-01-01), MacDonald et al.
patent: 3337422 (1967-08-01), Colton
patent: 3437645 (1969-04-01), Paige et al.
patent: 3658774 (1972-04-01), Liu
patent: 3705885 (1972-12-01), Hollstein et al.
patent: 3755484 (1973-08-01), Langer

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