In the overhauling of the system, by studying the chlorine production process, Taurus potash outs worked out a more reasonable process treatment and reduce the chlorine residual chlorine within the system, reducing the time to drain liquid chlorine; optimize the entire system gas replacement route, to ensure the continuity and replacement of chlorine thoroughness to ensure the safe and efficient handling of liquid chlorine step process to complete, to achieve a shorter maintenance time and increase the safety factor maintenance purposes.