Kraft pulping process

Details Kraft pulping process Kraft pulping process

1982-09-16

1985-03-26

Smith, William F.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

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

162 33, 162 35, 162 38, 162 82, D21C 1112

Patent

active

045071721

ABSTRACT:
A process of producing cooking liquor for addition to a digester for enhancement of the yield derived from kraft pulping of wood chips in which a portion of the black liquor is treated with lime under certain conditions and then reused as cooking liquor. The causticizing of the black liquor results in the generation of polysulfide ions and allows, through the formation of calcium-organo complexes, for the carryover of soluble calcium with the black liquor. The presence of calcium ions synergistically enhances the effectiveness of polysulfide such that the use of the new cooking liquor results in pulp yield increases of several percentage points for the same lignin content when compared to conventional kraft pulping.

REFERENCES:
patent: 3216887 (1965-11-01), Landmark

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