Despite its involvement in extracurricular chemical activities, this child is still known as the refined member of the family. CITGO Refining and Chemicals oversees CITGO Petroleum's refining and petrochemical manufacturing operations. The company operates conversion refineries -- located in Illinois, Louisiana, and Texas -- and is able to process about 117 million barrels of gasoline, 61 million barrels of distillates, and 25 million barrels of jet fuel a year. CITGO Refining and Chemicals operates 749,000 barrels of refining capaicty. Its Lake Charles refinery is the fourth largest in the US with a processing capacity of 425,000 - 440,000 barrels a day.