Kraft pulping process with spent sulphuric acid addition to stro

Details Kraft pulping process with spent sulphuric acid addition to stro Kraft pulping process with spent sulphuric acid addition to stro

1990-07-09

1992-01-14

Hastings, Karen M.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162301, D21C 111C

Patent

active

050807560

ABSTRACT:
An improved kraft pulping process is characterized by the addition of a spent concentrated sulphuric acid composition containing organic matter to a kraft recovery system to provide a mixture enriched in its total sulphur content that is subjected to dehydration, pyrolysis and reduction in a recovery furnace. The organic matter of the sulphuric acid composition is particularly beneficial as a source of thermal energy that enables high heat levels to be easily maintained to facilitate the oxidation and reduction reactions that take place in the furnace, thus resulting in the formation of sulphide used for the preparation of cooking liquor suitable for pulping.

REFERENCES:
patent: 4498955 (1985-02-01), Nelson
A. W. Pesch, "Substitutes for Salt Cake and Sulphur in the Kraft Pulping Process", TAPPI, 39 (6), p. 353 (1956).
J. N. Swartz, R. C. MacDonald & P. C. Hambaugh, "Kraft Liquor Sulphidity Control with Sulphuric Acid", TAPPI, 43(5) p. 499 (1960).

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