The facility is part of a 28.6 billion-yuan ($4.15 billion) complex built at the site and is the second major petrochemical plant starting this year after a similar-sized facility was announced last week by PetroChina in Guangdong province.
Sinopec is aiming to turn the Hainan complex into an export-oriented producer, with exports of downstream petrochemical products accounting for half its production by the end of 2025, the company said. It also operates a 184,000 barrels per day crude oil refinery at the same site.
Sinopec said it has developed its own ethylene technology with plants capable of handling a wide range of feedstocks, allowing the refiner to process different types of crude oil.