Manufacture of ethylene copolymers

Details Manufacture of ethylene copolymers Manufacture of ethylene copolymers

1979-01-10

1980-08-12

Smith, Edward J.

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

Synthetic resins

Removing and recycling removed material from an ongoing...

526 64, 526331, 528501, C08F 234, C08F 600

Patent

active

042174317

ABSTRACT:
A continuous process for the manufacture of ethylene copolymers under high pressure and at high temperature in a polymerization zone, with transfer of the reaction mixture into a high pressure product isolation zone and from there into a low pressure product isolation zone, and recycling of the unconverted gas from the high pressure product isolation zone into the polymerization zone and from the low pressure product isolation zone into a low temperature separator, from where the comonomer separated off is recycled to the polymerization process, while the ethylene is discharged as off-gas. The gas taken off the low pressure product isolation zone is preferably compressed to from 10 to 20 bar and cooled to from -10.degree. to -30.degree. C. before it is fed into the low temperature separator. There is a substantial improvement in the efficiency of separating off the comonomer.

REFERENCES:
patent: 3117953 (1964-01-01), Gobel et al.
patent: 3184444 (1965-05-01), Eilbracht et al.
patent: 3306889 (1967-02-01), Schappert
patent: 3336281 (1967-08-01), Eilbracht et al.
patent: 3577224 (1971-05-01), Hess et al.

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