Double decomposition of gypsum and potassium chloride catalysed by aqueous ammonia

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Abstract

With its property of markedly depressing the solubilities of certain inorganic salts while hardly affecting the solubilities of others, ammonia can be used to promote various crystallisation processes and some double decomposition reactions between inorganic salts. This paper examines an example of the second type of application in which gypsum and potassium chloride are reacted to form potassium sulphate. Experimental work is described which follows the progress of the reaction under a wide range of conditions. Some of the results give promise of forming the basis of a commercially viable process.

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Present address: Dept. of Chemical Engineering, Universidad de Oriente, Nucleo de Anzoategui, Puerto La Cruz, Venezuela.

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