Pulping method using vegetation raw material and xylanase
A technology of xylanase and grass, which is applied in the field of xylanase, can solve the problems of large amount of bleaching agent and long time for pulp treatment, and achieve the effects of increasing pulping output, reducing organic chloride and improving structure
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Embodiment 1
[0013] Example 1 Cut pulp raw material wheat straw into 3-5cm long grass slices, add lye with a concentration of 110-150g / L, and cook. The quality requirements of the cooking process are: cooking hardness 13-16K, residual alkali concentration after steaming 9~12g / L (recovery alkali). The cooked coarse pulp enters the pulp washer for pulp washing. Dilute xylanase into a working solution with a mass concentration of 2.5%, calculate as 40g / L dry pulp, continuously add the slurry in the yellow pulp washer, and mix it with the screw propeller and send it into the pulp storage tower. The bit is controlled at more than 70%, so as to achieve the residence time of xylanase and give full play to the catalytic degradation effect of xylanase. The slurry treated with xylanase is sent to the rinsing process, and bleaching agent is added for bleaching.
[0014]
[0015] experimental method
[0016] Table 2 Comparison table of start-up time and p...
Embodiment 2
[0017] Example 2 Cut the pulp raw material wood into wood chips with a slicer, add lye with a concentration of 110-150g / L, and cook in a steaming ball. The quality requirements of the cooking process are: cooking hardness 13-16K, residual Alkali concentration is 9~12g / L (alkali recovery). The cooked coarse pulp enters the pulp washer for pulp washing. Dilute xylanase into a working solution with a mass concentration of 2.5%, calculate as 40g / L absolute dry pulp, continuously add to the slurry at the high concentration tower, and mix and send it into the black pulp storage tower by a screw propeller. The pulp level is controlled above 70%, so as to achieve the residence time of xylanase and give full play to the catalytic degradation effect of xylanase. The slurry treated with xylanase is sent to the rinsing process, and bleaching agent is added for bleaching.
Embodiment 3
[0018] Example 3 Wheat straw, the pulp raw material, is cut into 3-5 cm long pieces, added with lye with a concentration of 110-150 g / L, and cooked, and the cooked coarse pulp enters a pulp washer for washing. Dilute xylanase into a working solution with a mass concentration of 2.5%, calculated as 50g / L dry pulp, continuously add to the slurry after washing, and send it into the slurry storage tower by the screw propeller, the slurry level is controlled Above 70%, in order to reach the residence time of xylanase, fully exert the catalytic degradation function of xylanase. The slurry treated with xylanase is sent to the rinsing process, and bleaching agent is added for bleaching.
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