Ionic membrane caustic soda light salt brine fine purification technique
A technology of ionic membrane caustic soda and light brine, applied in the direction of alkali metal chloride, etc., can solve the problems of increasing salt mud discharge, Na2SO3 waste, NaClO waste, etc., and achieve the reduction of equipment investment, reduction of addition amount, and reduction of external discharge Effect
Active Publication Date: 2008-10-29
昊华宇航化工有限责任公司
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The invention relates to a refining process for fresh brine of ion film caustic soda, in particular to dechlorination of the fresh brine and desorption of organics in the fresh brine; wherein, the fresh brine from an ion-exchange membrane electrolyzer is dechlorinated by a dechlorination tower to a range that the process allows, sent to a first brine process, added barium salt to remove sulfate radical brought in the system by material salt, and then is sent to a salt dissolving tank after water distribution; crude brine from the salt dissolving tank is added a refining agent for purification, Na2SO3 for dechlorination and a PH regulator in sequence, and then is sent to a second brine process after processing. The process is simple, reduces the process of adding Na2SO3 in a dechlorination system and that of adding NaClO in a brine refining system, reduces the variety and quantity of additives, decreases equipment investment and correspondingly saves power consumption of the part as well as alleviates the environmental pollution.
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