The plant, to be built in the Ruwais Derivatives Park, will be the first derivative unit developed under ADNOC's 165 billion dirham ($45 billion) Ruwais downstream investment programme.

ADNOC's statement did not give the value of the front-end engineering design contract.

The plant making linear alkylbenzene - used to make detergents - will be jointly operated by ADNOC and Cepsa, a Spain-based energy company owned by Abu Dhabi state investor Mubadala.

When it comes on-stream, the plant will produce 225,000 tonnes of normal paraffins per year and 150,000 tonnes of linear alkylbenzene per year, the statement said.