Pulping process

Details Pulping process Pulping process

1999-09-16

2000-11-28

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

162 68, 162 82, D21C 302

Patent

active

061530522

ABSTRACT:
An improved pulping process by which pulp yield is increased requires using polysulfide in the cooking liquor and lignocellulosic particles having a maximum thickness of 2 mm.

REFERENCES:
patent: 3215588 (1965-11-01), Kleinert
patent: 3664918 (1972-05-01), Clayton et al.
patent: 3664919 (1972-05-01), Clayton et al.
patent: 3704201 (1972-11-01), Helasti
patent: 4012280 (1977-03-01), Holton
patent: 4024229 (1977-05-01), Smith et al.
patent: 5082526 (1992-01-01), Dorris
Carboxyl End Groups in Sulfate and Polysulfide Pulps, Bo Alfredsson et al, Department of Engineering Chemistry, Chalmers Tekniska Hogskola, Goteborg, Sweden, Nr. 18, Sep. 30, 1963, pp. 703-706.
Sulphate Cooking with the Addition of Reducing Agents, Part 1, Preliminary report on the addition of sodium borohydride, N. Hartler, The Central Laboratory of the Swedish Cellulose Industry, Stockholm, Sweden, Nr. 13, Jul. 15, 1959, pp. 467-470.
Hemicelluloses and Paper Properties of Brich Pulps, Part 3, Sune E. Pettersson et al, Scensk Papperstidning drg. pp. 4-17.
Multi-Stage Polysulphide Pulping Process, Part I, Basic Ideas and Low-Temperature Impregnation Studies on Black Spruce Heartwood, Clayton et al, Pulp and Paper Research Institute of Canada, Dec. 1967, pp. T-619-630.
Cooking Liquor Oxidation and Improved Cooking Technique in Polysulfide Pulping, Landmark et al, vol. 48, No. 5, May 1965, Tappi, pp. 56A-58A.
Factors Affecting Yield Increase and Fiber Quality in Polysulfide Pulping of Loblolly Pine, other Softwoods and Red Oak, vol. 47, No. 10, Oct. 1964, Tappi, pp. 640-652, Sanyer et al.
Some Aspects of the Chemistry of Polysulfide Pulping, Ants Teder, Svensk Papperstidning drg. 72, No. 9, May 15, 1969.
Polarographic Analysis of Soda-Anthraquinone Pulping Liquor, Fleming et al, Tappi, Jul. 1979, vol. 62, No. 7, pp. 55-58.
The Thermal Decomposition of Aqueous Polysulfide solutions, Gustafsson et al, Swedish Forest Products Research Laboratory, Stockholm, Sweden, Nr. 8, Apr. 30, 1969, pp. 249-260.

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