Method of microbial pre-treating wood chips for paper making

Details Method of microbial pre-treating wood chips for paper making Method of microbial pre-treating wood chips for paper making

1996-08-27

1998-12-22

Alvo, Steven

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

162DIG12, 435278, D21H 2502

Patent

active

058513515

ABSTRACT:
A method of treating wood chips prior to making paper. In the process of making paper, wood chips must be converted to pulp through delignification of the wood and where white paper is required, bleaching to remove residual lignin also is required. The invention provides for the situation where wood chips are transported long distances by ship to paper mills, when the period of the journey is utilised to carry out pulping of the wood chips by biotechnological methods. Particularly, the conditions commonly existing in the hulls of the ships with which wood chips are transported are utilized to permit biopulping and/or biobleaching of the wood chips to occur. Suitable microorganisms, while in the form of viable propagules, are applied to the wood chips before or during loading into the hulls of ships, the microorganisms incubating and growing during the journeys, to permit biopulping and/or biobleaching to occur. In one embodiment the wood chips are inoculated with a slow-growing microorganism having hemicellulolytic capacity before being transported in a ship; and the wood chips are inoculated with a fast-growing microorganism having ligninolytic capacity after being loaded into the hull of a ship.

REFERENCES:
patent: 4687745 (1987-08-01), Farrel
patent: 5476789 (1995-12-01), Farrel et al.
patent: 5620564 (1997-04-01), Akhtar
Setliff et al, "Bimechanical pulping with white rot fungi"; TAPPI J. pp. 141-147, Aug. 1990.
Paice et al, "Direct Biological bleaching of hardwood kraft pulp with the fungus Coriolus versicolor", TAPPI J., pp. 217-221, May 1989.

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