Thermodynamic study of calcium based sulphur recovery for kraft black liquor gasification - Looking at the results of a global equilibrium analysis

A global equilibrium analysis rr as performed to simulate the recovery of s ulphur with a regenerable sorbent, Ca(OH)(2), from the product gas of kraft black liquor (KBL) gasification. Thr sulphur-removal efficiency rr;as disc ussed in terms of the operating temperature, pressure and Ca/S molar ratio. The sulphided sorbent, CaS, can be regenerated with a caustic solution at temperatures below 100 degreesC. Consequently, a high sulphidity white liqu or is obtained after separation of the solid Ca(OH)(2), while the latter ca n be re-used in the desulphurization stage. Based on this equilibrium analy sis, a process configuration is presented far sulphur recovery for kraft bl ack liquor gasification.