Manufacture of ethylene homopolymers and copolymers

Details Manufacture of ethylene homopolymers and copolymers Manufacture of ethylene homopolymers and copolymers

1978-08-01

1981-03-24

Michl, Paul R.

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

Synthetic resins

Removing and recycling removed material from an ongoing...

526 70, C08F 610

Patent

active

042581583

ABSTRACT:
A process for the continuous manufacture of ethylene polymers by catalytic polymerization of the monomer at an elevated temperature and elevated partial pressures of ethylene in a hydrocarbon which is a solvent for the monomer but a non-solvent for the polymer formed, the polymer being isolated by (a) discharging a mixture of polymer, hydrocarbon and monomer from the polymerization chamber, (b) bringing the mixture from stage (a) to a pressure and temperature such that a gaseous phase consisting of the monomer and hydrocarbon and a solid phase consisting of the polymer, with adhering hydrocarbon, is formed, and (c) flushing the solid phase from stage (b) with an inert gas, so as to form a solid phase consisting of polymer and a gaseous phase consisting of hydrocarbon and inert gas, wherein, as additional measures (d), the gaseous phase from stage (c) is brought to a pressure and temperature such that a gaseous phase consisting of inert gas and a liquid phase consisting of hydrocarbon are formed and (e) the liquid phase from stage (d) is separated into two components by evaporating one portion, as a rule the smaller portion, and recycling the remaining portion to the polymerization chamber. The process according to the invention minimizes atmospheric pollution.

REFERENCES:
patent: 2943082 (1960-06-01), Cottle
patent: 3184444 (1965-05-01), Eilbracht
patent: 3218729 (1965-11-01), Micklich
patent: 3225021 (1965-12-01), Erchak
patent: 3242150 (1966-03-01), Scoggin

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