Process for manufacturing improved high-yield pulps

Details Process for manufacturing improved high-yield pulps Process for manufacturing improved high-yield pulps

D - Textiles, Paper

21

C

9/34, 92/57

D21C 3/22 (2006.01) D21C 7/00 (2006.01)

Patent

CA 1065560

PROCESS AND APPARATUS FOR PREPARING HIGH-YIELD CELLULOSE PULP ABSTRACT OF THE DISCLOSURE Process and apparatus are provided for the preparation of improved high-yield cellulose pulps, such as semichemical, chemimechanical, thermo- mechanical, and mechanical pulps, which comprises mechanically defibrating a mixture of particulate ligcocellulosic materials which have been partially pulped and softened to different extents. Part of the raw lignocellulosic material in particulate form is washed, moistened with steam, impregnated with pulping chemicals and pulped to a yield of from about 65 to about 92%. Another part is treated in similar manner but either not pulped at all or, if pulped, pulped to a lesser extent, The two parts are mixed with- out intermediate washing, after which the mixture is heated to a temperature within the range from about 90 to about 200°C under pressure to obtain softening of the lignin, and delignification, after which the resulting product is mechanically defibrating to form cellulose pulp.

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