Pulp bleaching process comprising oxygen delignification and xyl

Details Pulp bleaching process comprising oxygen delignification and xyl Pulp bleaching process comprising oxygen delignification and xyl

1989-02-10

1993-01-12

Rosen, Sam

Chemistry: molecular biology and microbiology

Process of utilizing an enzyme or micro-organism to destroy...

Treating animal or plant material or micro-organism

162 63, 162 65, D21C 300

Patent

active

051790211

ABSTRACT:
Process for bleaching lignocellulosic material comprising an oxygen bleaching treatment and an enzymatic treatment with a substantially cellulase-free xylanase, which process is compatible with, and can be incorporated into, conventional bleaching sequences. The process provides a delignified and bleached pulp using lower amounts of chlorine-containing compounds, and the opportunity of eliminating the use of elemental chlorine, thereby reducing the polluting effluent from a pulp mill employing the process. Also, a greater extent of delignification can be achieved while retaining acceptable pulp strength properties. The oxygen bleaching treatment and the enzynmatic treatment are done in series.

REFERENCES:
patent: 4687745 (1987-08-01), Farrell
patent: 4923565 (1990-05-01), Fuentes et al.
Chauvet, J. M., Comtat, J. and Noe, P.; International Symposium on Wood & Pulping Chemistry Proceedings, Paris, p. 325 (1987).
Viikari, L., Rauna, M., Kantelinen, A., Linko, M. and Sundquist, J.; International Symposium on Wood & Pulping Chemistry, Paris (1987).
Paice, M. G., Bernier, R., Jurasek, L.; Biotech. and Bioeng., 32, pp. 235-239 (1988).

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