US 11,897,976 B2
Process for producing polyethylene
Kensuke Naraki, Ichihara (JP); and Toshihiko Manami, Ichihara (JP)
Assigned to SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo (JP)
Filed by Sumitomo Chemical Company, Limited, Tokyo (JP)
Filed on Mar. 24, 2022, as Appl. No. 17/702,957.
Claims priority of application No. 2021-060394 (JP), filed on Mar. 31, 2021.
Prior Publication US 2022/0325007 A1, Oct. 13, 2022
Int. Cl. C08F 2/01 (2006.01); C08F 110/02 (2006.01)
CPC C08F 2/01 (2013.01) [C08F 110/02 (2013.01)] 4 Claims
 
1. A process for producing polyethylene, comprising
subjecting high-pressure ethylene to polymerization using an autoclave-type reactor in presence of a polymerization initiator, wherein
the autoclave-type reactor has a reaction zone with at least two different temperature sections;
the polymerization initiator and the ethylene are supplied to the temperature section positioned upstream in the reaction zone of the autoclave-type reactor and the ethylene is polymerized to generate polyethylene;
unreacted ethylene and the polyethylene generated at the upstream temperature section in the autoclave-type reactor flow into the temperature section positioned downstream and in communication with the upstream temperature section in the reaction zone of the reactor, so that additional polyethylene is generated at the downstream temperature section; and
a difference (ΔT [° C.]) between a temperature (T1 [° C.]) of the temperature section positioned upstream and a temperature (T2 [° C.]) of the temperature section positioned downstream in the reaction zone that receives the polymerization initiator and is in the autoclave-type reactor is 2.1° C. or more and 8.4° C. or less.