Method of increasing cellulosic pulp yields in an alkaline diges

Details Method of increasing cellulosic pulp yields in an alkaline diges Method of increasing cellulosic pulp yields in an alkaline diges

1973-11-12

1976-02-10

Lindsay, Jr., Robert L.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Including recovery of organic by-product

162 61, 260124R, D21C 1100

Patent

active

039376478

ABSTRACT:
Increased pulp yields are obtained by alkaline digestion of cellulosic material until a pulp yield of not above 65% is obtained, lowering the pH of the digestion liquid is lowered to allow 11 causing organic substances to precipitate from the digestion liquor and then continuing digestion in the presence of the pulp until at least 5% of the organic substances which have been precipitated out are absorbed by the pulp.

REFERENCES:
patent: 1859888 (1932-05-01), Richter
patent: 2167556 (1939-07-01), Smull
patent: 2686120 (1954-08-01), Marshall et al.
patent: 2976273 (1961-03-01), Ball et al.
patent: 3428520 (1969-02-01), Yiannos
patent: 3806403 (1974-04-01), Ferguson

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