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 long processing time of pulp and large amount of bleaching agent, and achieve the effect of increasing pulping output, reducing dosage and improving structure
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Embodiment 1
[0013] Example 1 Cut wheat straw, a raw material for pulp, 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 washing machine for pulp washing. Dilute the xylanase into a working solution with a mass concentration of 2.5%, calculate it as 40g / T slurry, and continuously add the slurry to the yellow slurry washer, and mix it with a screw propeller and send it to the slurry storage tower. The slurry level is controlled. Above 70%, in order to reach the residence time of xylanase, and give full play to the catalytic degradation effect of xylanase. The slurry after xylanase treatment is sent to the rinsing process, and bleaching agent is added for bleaching.
[0014]
[0015] Experimental method
[0016] Table 2 Comparison ta...
Embodiment 2
[0017] Example 2 Cut the wood pulp material into wood chips with a slicer, add lye with a concentration of 110-150g / L, and cook in the steaming ball. The quality requirement of the cooking process is: the cooking hardness is 13-16k, and the residue is left after steaming. The alkali concentration is 9-12g / L (recovered alkali). The cooked coarse pulp enters the pulp washing machine for pulp washing. Dilute xylanase into a working solution with a mass concentration of 2.5%, calculate it as 40g / T slurry, continue to add the slurry to the high-concentration tower, and mix it with a screw propeller into the black slurry storage tower. Control above 70% to achieve the residence time of xylanase and give full play to the catalytic degradation effect of xylanase. The slurry after xylanase treatment is sent to the rinsing process, and bleaching agent is added for bleaching.
Embodiment 3
[0018] In Example 3, wheat straw, a raw material for pulp, was cut into 3 to 5 cm long grass pieces, and lye with a concentration of 110 to 150 g / L was added to cook, and the cooked coarse pulp was fed into a washing machine for pulp washing. Dilute the xylanase into a working solution with a mass concentration of 2.5%, calculated as 50g / T slurry, continue to add to the slurry after washing the slurry, and mix it with a screw propeller and send it to the slurry storage tower, the slurry level is controlled at 70 % Above, in order to reach the residence time of xylanase and give full play to the catalytic degradation effect of xylanase. The slurry after xylanase treatment is sent to the rinsing process, and bleaching agent is added for bleaching.
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