C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/622
C08F 210/06 (2006.01) C08F 210/16 (2006.01)
Patent
CA 1259746
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.
497006
Asanuma Tadashi
Funakoshi Yoshiyuki
Ohoka Tatuo
Mitsui Chemicals Incorporated
Sim & Mcburney
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