Method of reducing the resin content in sulfite pulp

Details Method of reducing the resin content in sulfite pulp Method of reducing the resin content in sulfite pulp

1995-02-14

1997-02-25

Corbin, Arthur L.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

D21C 9153

Patent

active

056056044

ABSTRACT:
Provided is a method for reducing resin content in sulfite pulp, in an ozone bleaching process where the sulfite pulp is bleached using ozone, at a pulp concentration of about 6 to about 14% by weight, and at a pH of less than about 7. The process includes the steps of alkalizing the sulfite pulp to a pH of greater than about 7 after ozone bleaching and then mechanically processing the sulfite pulp to press resin out of the sulfite pulp.

REFERENCES:
patent: 4259150 (1981-03-01), Prough
patent: 4922989 (1990-05-01), Backlund et al.
Paperi JA PUU, Vol. 10, 1987, Nic. Soteland, Georg Carlberg, "Environmentally Acceptable Bleaching of Sulphite Pulp and Hardwood Kraft Pulp", p. 832-p. 838, see p. 834, col. 1, line 6-line 10, figure 4.

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