Extraction method of potassium chloride mother liquor in production of 2, 6-dihydroxybenzoic acid

The invention relates to the technical field of chemical engineering, and provides an extraction method of potassium chloride mother liquor in production of 2, 6-dihydroxybenzoic acid, the potassium chloride mother liquor is extracted by adopting an extraction agent, the extracted water phase is concentrated and centrifuged to obtain potassium chloride, the extraction agent comprises an N503 solvent and a viscosity reducer, and the viscosity reducer is sulfonated kerosene. According to the technical scheme, the problem that potassium chloride obtained after the potassium chloride mother liquor is concentrated in the prior art is slightly red is solved. 本发明涉及化工技术领域，提出了2,6-二羟基苯甲酸生产中氯化钾母液的萃取方法，采用萃取剂对氯化钾母液进行萃取，萃取后的水相浓缩、离心，得到氯化钾，所述萃取剂包括N503溶剂和降黏剂，降黏剂为磺化煤油。通过上述技术方案，解决了相关技术中的氯化钾母液浓缩后得到的氯化钾颜色偏红的问题。