Method of producing kraft pulp using an acid prehydrolysis and p

Details Method of producing kraft pulp using an acid prehydrolysis and p Method of producing kraft pulp using an acid prehydrolysis and p

1982-01-22

1984-03-13

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Continuous chemical treatment or continuous charging or...

162 65, 162 82, 162 90, 435163, 435165, D21C 104, D21C 106, D21C 302

Patent

active

044365861

ABSTRACT:
A method for produce both kraft pulp and alcohol from hardwood chips or the like. The chips are subjected to mild acid prehydrolysis following by mild caustic pre-extraction. The withdrawn hydrolysate has insufficient furfural to inhibit microorganism growth, and both the hexose and pentose sugars in the hydrolysate are fermented to ultimately produce ethanol, butanol, or the like. The chips - after caustic pre-extraction - are subjected to a sulphate cook, and wash, and the resultant pulp is kraft pulp and even has viscosity and tear strength characteristics more desirable than that of conventional kraft pulp. The pulp can be subjected to oxygen delignification, and achieve a higher K number in fewer subsequent bleaching stages than conventional kraft pulp.

REFERENCES:
patent: 3097987 (1963-07-01), Sloman
patent: 3311530 (1967-03-01), Justus et al.
patent: 3380883 (1968-04-01), Richter et al.
patent: 3413189 (1968-11-01), Backlund
patent: 4071399 (1978-01-01), Prough
patent: 4094742 (1978-06-01), Bellamy
patent: 4104113 (1978-08-01), Sherman et al.
patent: 4155806 (1979-05-01), Mannbro
patent: 4174997 (1979-11-01), Richter
patent: 4342831 (1982-08-01), Faber et al.
"Billerud Pioneers Prehydrolysis-Kraft Pulping"; reprint from Pulp & Paper International, Dec. 1967.
"Continuous Prehydrolysis-Kraft Cooking" by Annergren et al., 1965.

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