Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in two or more physically distinct zones
Patent
1977-03-23
1978-08-08
Holler, Alan
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymerizing in two or more physically distinct zones
526 66, 526 67, 526 84, 526352, 5263522, 528488, 528501, C08F 202, C08F 434, C08F 464, C08F 1002
Patent
active
041058429
ABSTRACT:
Ethylene is polymerized, in the presence of hydrogen, at a temperature of 180.degree. to 340.degree. C and a pressure of 200 2,500 bars with a Ziegler catalyst in a stirred reactor having at least one first reaction zone and at least one second reaction zone. The reaction mixture is fed to a separator at a pressure of 80 to 400 bars. The improvement results from partially liquifying at least a part of the gas coming from the separator at a temperature of -50.degree. to +20.degree. C, releasing the pressure to a value of 10 to 60 bars, separating the partially liquified gas into a gas phase and a liquid phase, and recycling the gas phase to the second reaction zone and the liquid phase to the first reaction zone. The resulting polymer has a low melt index, a high polydispersity index, and superior physical properties compared to polymers prepared by conventional processes.
REFERENCES:
patent: 3758446 (1973-09-01), Coughlin et al.
patent: 4014859 (1977-03-01), Cooper et al.
Machon Jean-Pierre
Nicco Adrien
Holler Alan
Societe Chimique des Charbonnages--CdF Chimie
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