Process for the polymerization and copolymerization of ethylene,

Details Process for the polymerization and copolymerization of ethylene, Process for the polymerization and copolymerization of ethylene,

1976-06-03

1980-07-29

Holler, Alan

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

Synthetic resins

Polymerizing in tubular or loop reactor

526 65, 526 68, 526 73, 526 84, 5263522, 528483, C08F 1002

Patent

active

042152070

ABSTRACT:
Process and device for cooling a mixture of polymer and monomer from a reactor in which ethylene is polymerized or copolymerized at a pressure greater than 1,000 bars between a pressure-reduction valve located downstream of the reactor and a medium pressure separator. The cooling is achieved by injecting monomer at a pressure below that of the separator using a device with a nozzle cross-section S.sub.1 through which the mixture from the reactor passes, a convergent mixing zone in which the mixture is mixed with the monomer injected, which is supplied at a flow rate q, and a diffuser of throat cross-section S.sub.3, which makes it possible to bring the mixture to the pressure of the separator. The dimensions of the device are such that the ratio Q/S.sub.1 is between 0.20 and 1.35 t/hr.mm2 and the ratio (q+Q/S.sub.3 is between 0.1 and 0.3 t/hr.mm2.

REFERENCES:
patent: 3372154 (1968-03-01), Turner et al.
patent: 3373148 (1968-03-01), Mackie et al.
patent: 3509115 (1970-04-01), French
patent: 3719643 (1973-03-01), Knight
patent: 3719648 (1973-03-01), Frielink
patent: 3976631 (1976-08-01), van der Molen et al.
Trading Paper of Process Equipment Development Co.

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