Hengyi, one of the few private Chinese firms operating a refinery outside China, plans to add a 14 million tpy (280 000 bpd) crude oil refinery and a 2 million tpy paraxylene unit at its complex in Palau Muara Besar, the company said.
It will also build a 1.65 million tpy ethylene plant and 2.5 million tpy purified terephthalic acid (PTA) facility.
Construction will take three years and the investment is expected to bring an additional annual net profit of about US$1.72 billion, the firm said, without giving a date for starting work.
Hengyi in 2019 started up a 160 000 bpd refinery and petrochemical facilities at the same site at Palau Muara Besar.