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Adding xylanase to improve pulp bleaching effect

[ Time:2017-03-25 Click:822 ]

Sulfate wood pulp bleaching conditions are usually maintained at high temperatures and strong acid or strong base conditions. Process temperature and pH are very high, the lowest temperature and pH is not drift tower, respectively, 75 ~ 85 and PH9.5 ~ 10.5. Therefore, the application of chemical wood pulp to help bleach xylanase should have a strong heat resistance and alkali stability, in which heat resistance is the primary requirement. Most of the high temperature xylanase producing bacteria are bacteria, and the optimum temperature for pulp bleaching is 5580.

Alkaline pulping is the most important pulping method. The pH of the slurry is high after cooking, the pH of the slurry is about 11, and the pH value of the slurry is still higher than 10 after dilution. Moreover, the boiled pulp is usually subjected to strong alkali extraction and oxygen delignification before bleaching, and the xylanase bleaching process is usually set before or after the oxygen delignification process, thus achieving xylanase pulp bleaching Industrial applications, must be selected to be able to maintain high activity in alkaline conditions of the enzyme. Bleach alkali stability test range selected in the majority of PH8 ~ 10.

In the process of degradation of lignocellulose, low molecular weight enzymes easily penetrate the fibrous cell wall, promote fiber degradation. Low molecular weight xylanase in the pulp bleaching process, there may be more advantages than high molecular weight xylanase, because the low molecular weight is conducive to xylanase into the inner layer of pulp fiber cells, hydrolyzed fiber inner xylan, Release more lignin components.

 

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