Wood pulp bleaching composition containing sodium hydrosulfite a

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Treatment with particular chemical

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8110, 162 80, 162 83, 252105, 252188, 423515, D21C 910

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active

039606490

ABSTRACT:
An aqueous composition for bleaching wood pulp containing sodium hydrosulfite, and at least 2 weight percent hexamethylenetetramine based upon the weight of sodium hydrosulfite, wherein the solution has a pH between about 4 and about 11. The hexamethylenetetramine prevents hydrogen sulfide formation during bleaching of the wood pulp.

REFERENCES:
patent: 2067928 (1937-01-01), Kern
patent: 2071304 (1937-02-01), Hirschkind
patent: 2525770 (1950-10-01), Cook et al.
patent: 2707145 (1955-04-01), Sparrow et al.
patent: 3653804 (1972-04-01), Janson et al.
patent: 3666409 (1972-05-01), Yoshikawa et al.
patent: 3923960 (1975-12-01), Leigh

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