sentences:  In 2007, the decision to expand the refinery for the production of benzene, butadiene, and MTBE was made.For this, NOC concluded a contract to establish a joint venture with Dow Chemical Company.In 2008, a $2 billion contract with the Star Consortium, comprising the Al Ghurair's subsidiary TransAsia Gas International and ETA Ascon Star Group's Star Petro Energy, to own and upgrade the refinery was concluded.