Process for recovering a mixture of unreacted ethylene and propy

Details Process for recovering a mixture of unreacted ethylene and propy Process for recovering a mixture of unreacted ethylene and propy

1987-04-29

1988-08-09

Schofer, Joseph L.

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

Synthetic resins

Removing and recycling removed material from an ongoing...

526 77, 526 87, 526348, 525 54, 525240, 203 81, 203DIG18, 585809, C08F 604, C08F21002

Patent

active

047628979

ABSTRACT:
In a copolymerization process of propylene, a mixture of unreacted propylene and ethylene is recovered. It is then fed to a distillation system which includes first and second distillation columns. The distillation system is operated in such a way that the temperature and pressure of the top of the second distillation column remain constant and an ethylene-propylene mixture can be recovered at a constant ethylene/propylene ratio from the top of the second distillation column. By using the thus-recovered ethylene-propylene mixture, the copolymerization reaction can be carried out under excellent control so that the ethylene-propylene copolymer can be obtained with uniform quality and properties.

REFERENCES:
patent: 3322652 (1967-05-01), Huval
patent: 3565873 (1971-02-01), Sutherland, Jr. et al.
patent: 3644583 (1972-02-01), Scoggin
patent: 4065609 (1977-12-01), Willmore
patent: 4075287 (1978-02-01), Scoggin
patent: 4442271 (1984-04-01), Rau et al.

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