Chemicals conglomerate INEOS is investing EUR 3bn ($3.4bn) in a new plant at the key Belgian tanker port of Antwerp.
It is the largest sum to be pumped into the European chemical industry in 20 years, the port said.
The cash will create 400 new jobs as UK group INEOS expands its chemical production facilities.
It plans to build a brand-new propane dehydrogenisation (PDH) plant and an ethane cracker unit in Antwerp by 2024.