Process for producing polyethylene

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.