How is prechloric acid produced in industry?
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Prechloric acid is produced in industry through various methods. One method involves the distillation and desorption of industrial hydrochloric acid in a desorption tower, followed by condensing purification to obtain high purity HCl gas, and absorption in a falling film absorption tower . Another method involves an electrolytic-electrodialytic process, where chlorate ions from a sodium chlorate solution are transferred through an anion-exchange membrane to combine with electrolytically-produced hydrogen ions, resulting in the production of chloric acid . Additionally, prechloric acid can be produced by removing hydrogen chloride from hot combustion gas obtained through the joint combustion of off-gases containing chlorinated hydrocarbons and liquid residues of chlorinated hydrocarbons . Another method involves conducting dilute saline through distillation under reduced pressure to concentrate perchlorate ions, and then heating the concentrated dilute saline with concentrated hydrochloric acid to generate chlorine gas .
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