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Bamboo wood dissolving pulp manufacturing process

A manufacturing process and technology for dissolving pulp, applied in papermaking, textile and papermaking, pulping with inorganic alkali, etc. The effect of reduced liquid volume and high production efficiency

Inactive Publication Date: 2011-07-20
余钢纲
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Resulting in high energy consumption in the cooking process; large discharge of waste liquid, high cost of sewage treatment; high cost; no competitive advantage
At the same time, a large amount of sewage is discharged, causing certain harm to the environment
[0004] 2. The production process of the two-step bamboo fiber pulp also has the disadvantages of the pre-hydrolyzed kraft method. Whether it is cooked twice in the same place or in a different place, it is still treated twice.
The process is cumbersome, and there are also disadvantages of large liquid discharge and high energy consumption
In addition, the fiber purity is much lower than that of the pre-hydrolysis kraft method, which also lacks competitive advantages
[0005] 3. Although the pulp made by batch cooking with large amount of alkali and large liquid ratio is also one-time pulping, due to its low α-cellulose content and high hemicellulose content (that is, the alkali-resistant arabinose cannot be removed), resulting in Poor solubility of slurry

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0018] Such as figure 1 Shown, a kind of manufacture technique of bamboo dissolving pulp specifically comprises the following processing steps:

[0019] A. The original bamboo is cut into 2.5-4cm long bamboo slices by a disc slicer (or a roller slicer), and the cutting length rate is above 95, and the super long bamboo slices are selected. The qualified bamboo slices after cutting are washed with water to remove the fine impurities on the bamboo slices. At the same time, it can also adjust the moisture content of the bamboo slices evenly.

[0020] B. The washed bamboo slices are transported to the silo by the belt conveyor, and the aqueous solution containing α-L-arabinosidase is sprayed with a spray pipe before falling into the silo to pre-soak the bamboo slices in the silo to reduce the Decomposition of arabinose in bamboo chips. The conditions are as follows: enzyme preparation 180-200IU / g; addition amount 200 grams per ton of bamboo chips; pH value less than 4.6; temper...

Embodiment 2

[0034] A kind of manufacturing process of bamboo dissolving pulp, this process is to make natural color pulp board or pulp after bamboo is cut short, washed, pre-soaked, continuous cooking, and described pre-soaking is under 60 ℃, adopts pH value 200IU / g of the α-L-arabinosidase preparation of 4.0 is used as a presoaking agent, and the bamboo chips are presoaked for 20 minutes, and the addition of the α-L-arabinosidase preparation is 200 per ton of bamboo chips gram, the continuous cooking is to adopt the horizontal tube type continuous cooking device, adding the sulfate cooking liquid with large liquid ratio and large alkali amount in time intervals to continuously cook the pre-soaked bamboo for 300 minutes, once into pulp, the sulfate cooking liquid Contains NaOH and Na 2 S, the total amount of alkali used is 30% in terms of NaOH, and the degree of sulfide is 20%.

Embodiment 3

[0036] A kind of manufacturing process of bamboo dissolving pulp, this process is to make natural color pulp board or pulp after bamboo is cut short, washed, pre-soaked, continuous steaming, and described pre-soaking is under 40 ℃, adopts pH value Make presoaking agent for 3.8 α-L-arabinosidase preparation 180IU / g, carry out presoaking treatment to bamboo chip, treatment time is 60 minutes, the addition amount of α-L-arabinosidase is 200 grams per ton of bamboo chip , the continuous cooking is to use a horizontal tube type continuous cooking device, adding a large liquid ratio and a large amount of sulfate cooking liquid in different periods of time to continuously cook the pre-soaked bamboo for 400 minutes, once into pulp, the sulfate cooking liquid contains NaOH and Na 2 S, the total amount of alkali used is 42% in terms of NaOH, and the degree of sulfidation is 30%.

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Abstract

The invention relates to a process for preparing bamboo dissolving pulp. In the process, a bamboo material is sliced up, washed, pre-soaked and continuously cooked to produce an unbleached pulp pulp plate or pulp; the pre-soaking is to use an enzyme preparation as a pre-soaking agent to perform the pre-soaking treatment on the bamboo material after slicing up and washing; the continuous cooking is to add sulfate cooking liquid to the pre-soaked bamboo material for continuously cooking one to form pulp; and the bamboo dissolving pulp is obtained. Compared with prior art, the process has the advantages of simple flow, high production efficiency, little emission of waste liquid, low energy consumption, high pulping purity, good solubility, more than 95 percent of alpha-cellulose content and the like.

Description

technical field [0001] The invention relates to a manufacturing process of bamboo dissolving pulp. Background technique [0002] Bamboo is a fast-growing gramineous plant, which has the advantages of short growth period and short crop rotation period. Using bamboo as raw material to produce dissolving pulp is beneficial to protect the environment, keep forest vegetation from decreasing, and reduce soil erosion. Previously, there were pre-hydrolyzed kraft method and the so-called two-step method of reprocessing paper pulp. [0003] 1. Viscose bamboo fiber pulp or bamboo dissolving pulp manufactured by pre-hydrolysis kraft method, although the purity of the pulp is relatively high, two processes are required in the production. One is the pre-hydrolysis process; the other is the kraft cooking process. The two processes require two times of heating and two times of draining, and the cooking cycle is long. As a result, the energy consumption in the cooking process is large; th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/02D21C1/00C12S3/08D21C7/10
Inventor 余钢纲
Owner 余钢纲
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