Used 9,000 Nm3/H (318,000 SCFH) Carbon Monoxide Plant. The carbon monoxide plant uses coal tar as feedstock. The plant was originally built in 1997 at capacity of 2,000 m3/hr. After final expansion and upgrade in 2005, the plant reached 9,000 m3/hr. The new desulphurization unit was installed in 2005, and can treat 35,000 m3/hr of raw CO gas.