Bloomberg reports that Exxon Mobil Corp., will build a diesel hydrotreater at its Singapore refining complex and increase its output of ultra-low-sulfur supplies by the equivalent of 2 percent of China’s demand for the transport fuel. Exxon plans to boost supplies by 9 million liters a day to more than 25 million. The additional daily output is equivalent to 56,600 barrels. China may consume 2.87 million barrels a day of diesel this year, based on forecasts by the International Energy Agency. The facility may be completed by 2014. Exxon is spending more than $1 billion on diesel hydrotreaters at refineries in Baytown in Texas, Baton Rouge in Louisiana and in Belgium’s Antwerp to boost the plants’ capacity by 22 million liters a day.