Nanofiltration of kraft black liquor : Process development and techno-economic evaluation
Kraft black liquor (KBL) is a side-stream that is produced during the kraft pulping process, and mainly contains lignin, hemicelluloses, and cooking chemicals, namely sodium hydroxide and sodium sulphide. KBL is usually evaporated and burned in a recovery boiler in order to recover the cooking chemicals and generate energy. However, pulp mills are sometimes limited by the capacity of their recover