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公开(公告)号：US4337126A
公开(公告)日：1982-06-29
申请号：US201209
申请日：1980-10-27
CPC分类号： C25B1/16
摘要： The invention is directed to an electrolytic process for converting alkali metal carbonates to alkali metal hydroxides at high current efficiencies.
摘要翻译： 本发明涉及一种以高电流效率将碱金属碳酸盐转化为碱金属氢氧化物的电解方法。
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2.发明授权Rejuvenation of membrane type chlor-alkali cells by intermittently feeding high purity brines thereto during continued operation of the cell 失效在电池继续运行期间，间歇地向其提供高纯度盐水，使薄膜式氯碱电池复原
公开(公告)号：US4116781A
公开(公告)日：1978-09-26
申请号：US788836
申请日：1977-04-19
申请人： Martin M. Dorio , Alan J. Stacey
发明人： Martin M. Dorio , Alan J. Stacey
CPC分类号： C25B1/46 , C08J5/2293 , C25B15/08 , C08J2327/18
摘要： Chlor-alkali cells of the membrane type are highly susceptible to multivalent metallic impurities in the brine feeds. As the impurity concentration builds up on and/or in the membrane material, cell voltage increases and current efficiency is lost. By the practice of the instant invention the membrane is rejuvenated and the current efficiency of the cell increased by intermittently replacing the normal brine feed thereto with a brine which is of relatively high purity with respect to the multivalent metallic impurities found in the normal brine feed. Generally, the pure brine feed should have little or no hardness (calcium and magnesium level) or, if present, the hardness should be completely complexed by a phosphate treatment. The other multivalent metallic impurities should be present in the "pure" brine at less than 2 milligrams per liter in total and preferably less than 1 milligram per liter thereof, while each individual other metallic contaminant should not exceed 0.5 milligrams per liter and preferably it would be below 0.2 milligrams per liter.
摘要翻译： 膜类型的氯碱电池对盐水进料中的多价金属杂质很敏感。 当杂质浓度积聚在膜材料上和/或膜材料中时，电池电压增加，电流效率损失。 通过本发明的实践，膜被再生，并且通过用相对于在正常盐水进料中发现的多价金属杂质具有相对高的纯度的盐水间歇地代替正常的盐水进料来增加膜的电流效率。 通常，纯盐水进料应具有很少的或没有硬度（钙和镁的水平），或者如果存在的话，硬度应该通过磷酸盐处理完全复合。 其他多价金属杂质应以小于2毫克/升的总量存在于“纯”盐水中，优选小于1毫克/升，而每一个其他金属污染物不应超过0.5毫升/升， 低于0.2毫克/升。
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