Treatment of wood chips with an alkali metal borohydride solutio

Details Treatment of wood chips with an alkali metal borohydride solutio Treatment of wood chips with an alkali metal borohydride solutio

1974-12-17

1976-09-21

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

162 86, 162 90, D21C 302, D21C 312

Patent

active

039817652

ABSTRACT:
A chemi-mechanical process for producing unbleached pulp with improved yields at high brightness including impregnating a lignocellulosic material in the form of wood chips with an alkaline solution containing an alkali metal borohydride in an amount over 0.1% by weight at a pH greater than 13, heating the impregnated chips at a temperature less than 150.degree. C to provide semi-cooked chips having a brightness in excess of 60 GE, and then defiberizing the semi-cooked chips to mechanically separate the fibers into an unbleached pulp having said brightness and a yield of at least 85%.

REFERENCES:
patent: 2069943 (1937-02-01), Dreyfus
patent: 3042575 (1962-07-01), Hartler
patent: 3100732 (1963-08-01), Smedberg
patent: 3284283 (1966-11-01), Kindron et al.
patent: 3637516 (1972-01-01), Wade

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