Method for increasing the efficiency of a causticizing process

Details Method for increasing the efficiency of a causticizing process Method for increasing the efficiency of a causticizing process

D - Textiles, Paper

21

C

9/36.8

D21C 11/04 (2006.01)

Patent

CA 1267255

ABSTRACT OF THE DISCLOSURE A METHOD FOR INCREASING THE EFFICIENCY OF A CAUSTICIZING PROCESS A method for increasing the efficiency of the causticizing process which comprises: a) adding to a green liquor between 78 and 82% of the stoichiometric amount of lime necessary to react with the amount of Na2C03 present in the green liquor to obtain a white liquor containing NaOH and lime mud. The white liquor is then clarified by extracting the lime mud present to obtain a white liquor having a total solid concentration of about 10-60 grams/liter. The supernatant liquid of the white liquor is treated with an additional amount of lime to increase the causticity to about 87%, then allowing further causticizing reaction between the lime and Na2CO3. The remaining lime mud present is removed to obtain a white liquor which has the causticity of about 87%. One is thus able to raise the causticity of partially clarified white liquor following the normal causticizing process, the mud present being sufficient to increase causticity without substantially decreasing settling rate.

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