Causticization
Causticization :
Also called the Lime-soda process. A general name for the generation of sodium hydroxide by reacting sodium carbonate with calcium hydroxide: Na2CO3 + Ca(OH)2 + 2NaOH + CaCO3. The process is operated at 80 to 900C with a slight excess of the calcium hydroxide. This was the only method used for making sodium hydroxide after the invention of the Leblanc process, and before the introduction of the Castner-Kellner process around 1890. The process is still used when the demands for chlorine and sodium hydroxide from the Castner-Kellner process are unbalanced, and for the regeneration of waste pulping liquors in the manufacture of pulp and paper by the Kraft process. See also: LÖwig. (Check source for accuracy of chemical formula)
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