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Pulping softener and pulping method adopting same

A softener and pulping technology, applied in the field of papermaking, can solve problems such as large one-time investment, environmental pollution, and large quantities, and achieve the effects of saving pulp washing water, saving water consumption, and reducing costs

Inactive Publication Date: 2011-02-09
王玉萍 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current wheat straw pulping method mainly uses the caustic soda method, but the production of pulp by the caustic soda method will produce a large amount of alkali-containing black liquor, causing serious pollution to the environment, and it is very difficult to treat
At present, the more commonly used treatment method is alkali recovery, but this method has a large one-time investment and cannot fundamentally solve the problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The softening agent for pulping of the present embodiment is made up of the following components by weight percentage: water-based polyurethane 4%, hydrogen chloride 3%, auxiliary agent 6%, and balance is water; Wherein the auxiliary agent is made up of the following components by weight percentage: Sodium chloride 5%, sodium tripolyphosphate 5.5%, the balance is water.

[0023] The pulping method adopting the above-mentioned pulping softener of the present embodiment is: pulping with wheat straw as a raw material, which includes the following steps:

[0024] 1) Preprocessing:

[0025] The existing crushing and impurity removal machine is used to crush and remove the wheat straw, so that the length of the wheat straw after the crushing and impurity removal treatment is 10-15mm, and it is screened through the air duct to remove the residual ears, wheat grains and dust;

[0026] After crushing and removing impurities, the wheat straw is combed and separated by a grinder,...

Embodiment 2

[0037] The pulp softening agent of the present embodiment is made up of the following components by weight percentage: water-based polyurethane 5.5%, hydrogen chloride 4.5%, auxiliary agent 4%, balance is water; Wherein auxiliary agent is made up of the component of following weight percentage: 6% hydrogen peroxide, 7% sodium tripolyphosphate, and the balance is water.

[0038] The pulping method that adopts above-mentioned pulping softening agent of the present embodiment is the same as the method of embodiment 1, difference is: (1), the raw material that adopts is rice straw; (2), the condition of softening treatment is 70 ℃, 1.5 atmospheric pressure , the soaking time was 2.5 hours, and the weight ratio of straw and softener was 20:80 during soaking; (3), the weight ratio of straw and disinfectant was 6:94 during disinfection; The diluted concentration is 4.5%.

Embodiment 3

[0040] The pulp softening agent of the present embodiment is made up of the following components by weight percentage: water-based polyurethane 7%, hydrogen chloride 6%, auxiliary agent 8%, balance is water; Wherein the auxiliary agent is made up of the following components by weight percentage: Sodium chloride and hydrogen peroxide are 7%, sodium tripolyphosphate is 4%, and the balance is water. Wherein the ratio of sodium chloride and hydrogen peroxide is 1:1.

[0041] The pulping method of the present embodiment adopting the above-mentioned pulping softener is the same as the method in Example 1, the difference is that: (1), the raw material used is corn stalks; (2), the softening condition is 80 ° C, 2.5 Atmospheric pressure, soaking time is 4 hours, and the weight ratio of corn stalks and softening agent is 22: 78 when soaking; (3), the weight ratio of corn stalks and disinfectant is 7: 93 during disinfection; The diluted concentration of papermaking raw pulp is 6%.

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Abstract

The invention discloses pulping softener, which comprises the following components by weight percent: 4 to 7 percent of aqueous polyurethane, 3 to 6 percent of chlorine hydride, 4 to 8 percent of assistant agent, and the balance water, wherein, the assistant agent comprises the following components by weight percent: 5 to 7 percent of sodium chloride and / or hydrogen peroxide, 4 to 7 percent of sodium tripolyphosphate, and the balance water. The invention simultaneously discloses a pulping method adopting the pulping softener. No strong alkaline materials, such as sodium hydroxide and the like, are added in the pulping softener, and no black liquor is produced during the process of pulping by adopting the softener, and the problem of alkaline black liquor in the traditional pulping method is radically solved, and the produced finished pulp does not require pulp washing, and can be directly used for paper making, therefore, purling water utilization can be saved. Compared with traditional technology, the pulping method adopting the pulping softener saves 83.3 percent of water.

Description

technical field [0001] The invention relates to a pulping softener and a pulping method using the softener, which belongs to the technical field of papermaking. Background technique [0002] my country's paper industry mainly uses non-wood fibers as raw materials, straw pulp accounts for about 80% of paper-making raw materials, and non-wood fiber materials can use wheat straw, straw, corn stalks, cotton stalks, reeds, etc. my country's wheat straw resources are very rich. The price is cheap, and it has great advantages in straw pulp papermaking. The current wheat straw pulping method mainly uses the caustic soda method, but the production of pulp by the caustic soda method will produce a large amount of alkali-containing black liquor, causing serious pollution to the environment, and it is very difficult to treat. At present, the more commonly used treatment method is alkali recovery, but this method has a large one-time investment and cannot fundamentally solve the problem....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/14D21H17/65D21H17/57D21H17/66D21H17/63D21C3/04D21C3/18D21C1/04D21H11/12D21H21/36
Inventor 王玉萍程相玉
Owner 王玉萍