Single stage process for bleaching of pulp with an aqueous hydro

Details Single stage process for bleaching of pulp with an aqueous hydro Single stage process for bleaching of pulp with an aqueous hydro

1988-12-23

1990-04-10

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

162 80, D21C 916

Patent

active

049157850

ABSTRACT:
A rapid, single stage process for the bleaching of high yield lignocellulose pulp (mechanical pulp) to enhanced brightness levels with hydrogen peroxide in the presence of magnesium sulphate and sodium silicate, with a substantial reduction in the wasteful, non-bleaching reactions of hydrogen peroxide. The residual hydrogen peroxide liquor may be recycled to a pulping or bleaching process.

REFERENCES:
patent: 4029543 (1977-06-01), Lindahl
patent: 4462864 (1984-07-01), Carles et al.
Singh, "The Bleaching of Pulp", TAPPI Press Atlanta, Ga. 1979, pp. 222-279.
Singh, "The Bleaching of Pulp", TAPPI Press Atlanta, Ga., 1979, pp. 275-278.
Strunk, "Factors Affecting Hydrogen Peroxide Bleaching for High-Brightness TMP", Pulp & Paper, Jun. 1980 (162-178).
W. Howard Rapson, "Mechanisms of Groundwood Bleaching"; Appita, vol. 23, p. 102 (1969).
D. Lachenal and C. de Choudens, Tappi; 70(3), 119 (1987).
S. Moldenius and B. Sjogren, J. Wood Chem. and Technology; 2(4), 447 (1982).
M. Lundqvist, Svensk Papperstid.; 81(1), 16 (1979).
S. Moldenius, Svensk. Papperstid.; 85(15), R116 (1982).
T. Ali et al., Preprints 72nd Annual Meeting, Technical Section, CPPA; B15 (1986).
P. Joyce and D. Mackie, 1979 International Pulp Bleaching Conference Preprints, Toronto; p. 107.

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