Method of pulping with polysulfide

Details Method of pulping with polysulfide Method of pulping with polysulfide

1974-12-16

1978-12-19

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

162DIG2, D21C 304

Patent

active

041304578

ABSTRACT:
Significant yield increases are obtained in pulping of wood or other lignocellulosic materials with polysulfide liquors through particular control of the times and temperatures of treatment. The lignocellulosic material is treated with a polysulfide liquor at less than 100.degree. C for about 45 minutes, the liquor is removed for reuse, the impregnated lignocellulosic material is quickly steamed to pulping temperature and is pulped at a low temperature of about 160.degree. C for a short period of time.

REFERENCES:
patent: 3551286 (1970-12-01), Barker
patent: 3567572 (1971-03-01), Clayton et al.
patent: 3644919 (1972-05-01), Clayton et al.
patent: 3661698 (1972-05-01), Clayton et al.

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