Increasing causticizing efficiency of alkaline pulping...

Details Increasing causticizing efficiency of alkaline pulping... Increasing causticizing efficiency of alkaline pulping...

D - Textiles, Paper

21

C

D21C 11/00 (2006.01) D21C 3/02 (2006.01)

Patent

CA 2273470

Method for improving causticizing efficiency in the conventional lime recausticization portion of alkaline pulping processes, such as are commonly used in the pulping and bleaching of wood and non-wood cellulose fiber materials. An aqueous solution of sodium carbonate is reacted with lime to produce sodium hydroxide (causticization) in the presence of borate to improve the causticization reaction efficiency. Borate is provided in an amount sufficient to maintain a boron to sodium molar ratio in the range of between about 0.001:1 and 0.4:1, resulting in an increased causticization efficiency. An added benefit is reduction of inorganic deadload in the pulping circuit.

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