Process for the preparation of cooking liquors having high...

Details Process for the preparation of cooking liquors having high... Process for the preparation of cooking liquors having high...

D - Textiles, Paper

21

C

D21C 11/04 (2006.01) D21H 17/00 (2006.01)

Patent

CA 2069107

An improvement is provided in a process for preparing, under reducing conditions, cooking liquors for sulphate pulp cooking. The black liquor which is formed in the cooking process is fed, after evaporation, completely or partly to a reactor operating at increased temperature. The increased temperature is obtained by energy which is supplied from an external heat source and/or release of energy from the black liquor, thereby to form a melt of sodium sulphide. The melt then is withdrawn to be further processed to cooking liquor. The melt, and the whole or part of at least one of sulphur-containing, sulphur- and sodium- containing materials which are present in the pulp mill including sulphur- containing, and sodium- and sulphur-containing make-up chemicals used for the total chemicals balance of the pulp mill, are fed to the reactor in such a way that the mole ratio of sodium to sulphur in the total mixture which is fed to the reactor is within the range of from 1.5 to 4.

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