Pulp bleaching process comprising oxygen delignification and xylanase enzyme treatment
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United States of America Patent
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Jan 12, 1993
Grant Date -
N/A
app pub date -
Feb 10, 1989
filing date -
Feb 10, 1989
priority date (Note) -
Expired
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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.
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