In Saudi Arabia, most of the olefins plants and refineries use caustic to remove impurities from the feedstock, like sulfur, CO2, H2S and mercaptans. A quantity of around 1200 tons of caustic is consumed on daily basis in petrochemical facilities and another 500 tons per day are consumed by refineries.
Spent caustic is one of the most problematic waste streams generated in the olefins plants and in refineries due to its large quantity and its high sulfide concentration. Most industries in Jubail incinerate the spent caustic. Even though incineration can treat the spent caustic, but it requires large quantities of fuel and generates gaseous emissions such as NOx, SOx, CO and PM.
NBT International is working with ARM to develop a project in Jubail for the collection, storage and treatment of spent caustic.