Recovery of organic substances dissolved in mechanical pulp

Details Recovery of organic substances dissolved in mechanical pulp Recovery of organic substances dissolved in mechanical pulp

1993-07-19

1995-05-16

Chin, Peter

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

162 19, 162190, 435101, 435196, 435278, 435913, D21C 320

Patent

active

054157358

ABSTRACT:
This invention relates to a method for the recovery of organic substances dissolved or brought into a colloid form during the manufacture of a mechanical pulp where said mechanical pulp has not been subject to previous alkaline bleaching or other previous process carried out under alkaline conditions. The method is characterized in the deacetylation of the galactoglucomannans having been brought into dissolved or colloidal form during the pulping process, and subsequent deposition of said deacetylated glucomannans onto a solid phase, such as pulp fibers or organic or inorganic additives. The deacetylation is performed either by alkali or enzymatically. The method diminishes the organic substance loading on recycling waters and effluents, and improves the yield and strength properties of the pulp.

REFERENCES:
patent: 3406089 (1964-10-01), Yerkes, Jr.
Holmbom et al. "Chemical Changes in Peroxide Bleaching of Mech Pulp" Das Papier, 45. Jahrgang, Heft 10A, 1991, pp. 16-22.
Tenkanen et al., "Production, Purification . . . Lignocellulosic", Jnl of Biotechnology, 18 (1991), pp. 69-84.
Thornton, Jeff, "Effects of Peroxide . . . Organic Substances", 6th Int. Symp of Pulping & Wood Chem, Australia 1991, pp. 1-7.
Lafend K. B., "Effect of Acetyl Content . . . Properties", TAPPI vol. 51, No. 3, Mar. 1968, pp. 118-123.
"Chemical Changes in Peroxide Bleaching of Mechanical Pulps", Thornton et al., Das Papier, 45.Jahrgang, Heft 10A, 1991, pp. 16-22.
"Sorption of Hemicelluloses on Cellulose Fibres" Hansson, Holzforschung 24 (1970) H. 3, pp. 77-83.
"The Influence on Paper Strength . . . " Lindstrom et al., Svensk Papperstidn. 80(11):341-345, 1977.
"Production, purification and characterization . . . ", Jnl. of Biotechnology, 18 (1991), pp. 69-84.

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