Production of polyethylene

Details Production of polyethylene Production of polyethylene

1978-01-16

1979-11-20

Smith, Edward J.

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

Synthetic resins

Polymerizing in tubular or loop reactor

526 65, 526 86, 526 87, 526 88, 5263522, C08F 202, C08F 428, C08F 1002

Patent

active

041751698

ABSTRACT:
Polyethylene is produced by polymerization of ethylene alone or with comonomers or telogens (modifiers) in an elongated tubular reactor having an inlet and outlet and at least one reaction zone and one cooling zone in the presence of free radical or free oxygen yielding initiator at elevated temperatures and pressures by passing the reaction mixture through each of the reaction zones of the tubular reactor having internal diameters between about 0.5 and 3 inches at bulk fluid velocities sufficient so that the Flow Number in each reaction zone is greater than 3.3 ft..sup.2 /sec. Flow Number is defined as the bulk fluid velocity in ft./sec. times diameter in feet. With Flow Numbers in excess of 3.3 ft..sup.2 /sec. in the reaction zones, it has been found that the effective reaction volume in the reaction zone has been increased and, accordingly, a more efficient process for producing a high quality polyethylene.

REFERENCES:
patent: 3628918 (1971-12-01), Beals et al.
Albright, L. F., "High-Pressure Processes for Polymerizing Ethylene", Chemical Engineering, 12/19/66, pp. 113-120.

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