Kraft pulp bleaching and recovery process

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...

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162 40, 162 65, 162 78, 162 90, D21C 916

Patent

active

041960432

ABSTRACT:
A Kraft pulp bleaching process comprising from one to about three treatments with ozone and a final treatment with an alkaline peroxide solution, the treatments being separated by an alkaline extraction, wherein effluent from the bleach treatments is utilized in subsequent bleaching operations or in the chemical recovery system of a Kraft pulping process.

REFERENCES:
patent: 1683262 (1928-09-01), Richter et al.
patent: 1957937 (1934-05-01), Campbell et al.
patent: 2147618 (1939-02-01), Rawling
patent: 3366534 (1968-01-01), Rapson
patent: 3382149 (1968-05-01), Hoh
patent: 3451888 (1969-06-01), Ancelle et al.
patent: 3453174 (1969-07-01), Rapson
patent: 3632469 (1972-01-01), Wilder
patent: 3740308 (1973-06-01), Rapson
patent: 3798119 (1974-03-01), Singh
patent: 3867246 (1975-02-01), Hebbel et al.
Rydholm, Pulping Processes, 1965, p. 583.

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