Process for the production of sodium chlorate

专利名称：Process for the production of sodium

chlorate

发明人：Reiji Takemura申请号：US06/240226申请日：19810303公开号：US04405418A公开日：19830920

摘要：A process for the production of sodium chlorate comprising electrolyzing anaqueous sodium chloride solution in a diaphragmless sodium chlorate cell, characterizedin that an aqueous sodium chloride solution containing, as impurities, calcium, magnesium,barium and the like is contacted with a chelating ion exchange resin to remove theimpurities and the resulting saline solution is supplied into a diaphragmless sodiumchlorate cell, thereby enabling sodium chlorate to be produced at a stable electrolyticvoltage. Further, there is provided a process for the production of sodium chlorate usinga combination of a sodium chlorate cell and a cation exchange membrane process typechlorine- alkali cell, characterized in that a weak saline solution taken out of an anodechamber of a cation exchange membrane process type chlorine- alkali cell is suppliedwith sodium chloride to form an aqueous sodium chloride solution, which is subsequentlycontacted with a chelating ion exchange resin to remove calcium, magnesium, barium andthe like contained as impurities in said solution, and at least part of the resulting purifiedsaline solution is supplied into a sodium chlorate cell, whereby sodium chlorate formedas a by-product in the chlorine- alkali cell can be effectively recovered and the elevationof the electrolytic voltage of the sodium chlorate cell with the lapse of time can be well

prevented.

申请人：ASAHI KASEI KOGYO KABUSHIKI KAISHA

代理机构：Birch, Stewart, Kolasch & Birch

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