[目的]建立精喹禾灵原药生产废水中对甲苯磺酸钾及碳酸钾的分离回收工艺。[方法]测定绘制25℃碳酸钾-碳酸氢钾-对甲苯磺酸钾-水四元体系固液平衡相图,并以此为基础设计精喹禾灵原药生产废水中对甲苯磺酸钾及碳酸钾的分步蒸发分离回收工艺。[结果]利用分步蒸发分离回收工艺,精喹禾灵原药生产废水中对甲苯磺酸钾的回收率及纯度分别为98.5%和98.2%;碳酸氢钾热解为碳酸钾可全部回收,回收的碳酸钾纯度达98.5%。[结论]利用碳酸钾-碳酸氢钾-对甲苯磺酸钾-水四元体系固液平衡相图很好地指导该体系中混合盐的分离回收。 [Objective] The research aimed to establish a process for the separation and recovery of potassium p-toluenesulfonate and potassium carbonate in the production of quizalofop crude drugs. [Method] The solid-liquid equilibrium phase diagram of potassium carbonate-potassium bicarbonate-potassium p-toluenesulfonate-water quaternary system at 25 ℃ was drawn and plotted. Based on this, the potassium p-toluenesulfonate And potassium carbonate step by step evaporation separation and recovery process. [Result] The recoveries and purities of potassium p-toluenesulfonate in the wastewater from the production of quizalofop crude were 98.5% and 98.2%, respectively, by fractional evaporation separation and recovery process. Potassium bicarbonate was recovered as potassium carbonate, The recovery of potassium carbonate purity of 98.5%. [Conclusion] The solid-liquid equilibrium phase diagram of potassium carbonate-potassium bicarbonate-potassium p-toluenesulfonate quaternary system could guide the separation and recovery of mixed salt in this system.