Icahn owns a majority stake in oil refining company CVR Energy Inc CVI.N.

Together, the plants make up the world's largest oil refining complex.

The Chemical segment constructs plants such as oil refining, petrochemicals, gas, upstream and others.

This week, Singapore unveiled a new technology to help safeguard the country's oil refining sector.

He also said a Lopez Obrador government should consider allowing private investment in oil refining.

Grace makes catalysts used in the chemical and oil refining sectors, as well as construction products.

Alternatively, the hydrogen could be separated for a transport fuel or used by the oil refining industry.

That means, for one thing, that the immediate outlook for the oil refining industry is not rosy.

Around 60% of it was used in catalysts for oil refining and in vehicle engines.

Exxon has been scaling back its exposure to retail fuel markets and oil refining in Latin America.

And oil refining in greater New Orleans, a different U.S. federal employment category, is expected to remain strong.

Its oil refining capacity stands at 24.1 million tonnes a year.

Opponents say lifting the ban could harm the environment and hit jobs related to oil refining and shipping.

But it has also raised concerns within industries that rely heavily on imports, including retailing and oil refining.

Opponents to lifting the ban say it could hurt employment in oil refining and shipbuilding and damage the environment.

The Gulf Coast states of Texas, Louisiana and Mississippi are home to almost half of U.S. oil refining capacity.