High strength, low salt hypochlorite production
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United States of America Patent
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Apr 17, 2018
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Mar 4, 2015
filing date -
Mar 5, 2014
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Abstract
High strength, low salt solutions of alkali hypochlorite (e.g. sodium hypochlorite) can advantageously be produced in a system comprising a subsystem in which alkali hydroxide solution and chlorine are reacted to produce alkali hypochlorite and salt solids in a crystallizer, while drawing a vacuum in the crystallizer. In a system comprising a chlor-alkali plant, the alkali hydroxide solution and chlorine can be directly obtained (i.e. without concentrating) from the electrolyzer in the plant. A net energy savings in the system can be achieved and water consumption in the chlor-alkali plant can be substantially decreased by returning chlorinated condensate from the crystallizer to the recycle line in the chlor-alkali plant. Salt can be efficiently recovered by redissolving the salt solids produced in depleted brine and returning it directly to the electrolyzer. As a result, high strength, low salt hypochlorite can be produced without the need to evaporate caustic.
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