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Preparation method of wood pulp for long viscose fibers

A technology for wood pulp and long fibers, which is applied in the field of wood pulp for viscose long fibers, can solve the problems of easy formation of rubber particles, micelles, pollution of environment and water sources, parity of insoluble grade wood pulp, etc. The effect of targeted reaction, COD emission reduction, and effective control of polymerization degree

Inactive Publication Date: 2011-09-07
山东银鹰股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) All adopt the two-stage pulping method of cooking and bleaching, the pulping process is cumbersome and complicated, and the energy consumption is high
[0005] (2) Chlorine chlorination and sodium hypochlorite bleaching are used for bleaching, which will produce organic halides and carcinogenic dioxins, which will pollute the environment and water sources
[0006] (3) Although the obtained wood pulp reaches the wood pulp index for viscose long fiber, the content of non-fibrous impurities is high. In the production process of viscose long fiber, the reactivity is poor, and it is easy to form rubber particles and micelles. Plugging filter cloth cannot be used alone, it must be used in combination with a certain proportion of cotton pulp, the proportion generally cannot exceed 10%, and the viscose long fiber obtained has poor spinnability and cannot be compared with dissolving grade wood pulp
[0007] (4) The cooking section adopts high-temperature and high-alkali technology, which greatly damages the armor fiber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1, a kind of preparation method of wood pulp for viscose staple fiber, comprising preparation, lye preparation, screw press, cooking, washing, impurity removal, pulp making process;

[0027] The material preparation process is: cut the wood pulp into 2cm strips with a pulp cutter, and send them to the screw press through a cyclone separator;

[0028] The lye preparation process is as follows: the temperature is controlled at 30° C., adding sodium hydroxide with a relative absolute dry volume of 3%, scouring agent with a relative absolute dry volume of 0.2%, and hydrogen peroxide with a relative absolute dry volume of 2.5%. Anthraquinone with a relative dry pulp volume of 0.1%, and hemicellulose bioactive compound enzyme with a relative dry pulp volume of 1‰, are prepared into lye, and the scouring agent is produced by Qingdao Haiyi Fine Chemical Co., Ltd., HaiYi brand , the scouring agent model is SDO-A, and the hemicellulose bioactive compound enzyme is Ca-s...

Embodiment 2

[0039] Embodiment 2, a kind of preparation method of wood pulp for viscose staple fiber, comprising the steps of material preparation, lye preparation, screw pressing, cooking, washing, impurity removal, and pulp making;

[0040] The material preparation process is: cut the wood pulp into 3cm strips with a pulp cutter, and send them to the screw press through the cyclone separator;

[0041] The lye preparation process is as follows: the temperature is controlled at 32°C, adding sodium hydroxide with a relative dry pulp volume of 3.2%, scouring agent with a relative dry pulp volume of 0.21%, and hydrogen peroxide with a relative dry pulp volume of 2.8%. Anthraquinone with a relative dry pulp volume of 0.12%, and hemicellulose bioactive compound enzyme with a relative dry pulp volume of 1.2‰, prepared into lye, and the scouring agent is produced by Qingdao Haiyi Fine Chemical Co., Ltd., HaiYi brand , the scouring agent model is SDO-A, and the hemicellulose bioactive compound enz...

Embodiment 3

[0052] Embodiment 3, a kind of preparation method of wood pulp for viscose staple fiber, comprising the steps of material preparation, lye preparation, screw pressing, cooking, washing, impurity removal, and pulp making;

[0053] The material preparation process is: cut the wood pulp into 4cm strips with a pulp cutter, and send it to the screw press through a cyclone separator;

[0054] The lye preparation process is as follows: the temperature is controlled at 36° C., adding sodium hydroxide with a relative dry pulp volume of 3.4%, scouring agent with a relative dry pulp volume of 0.22%, and hydrogen peroxide with a relative dry pulp volume of 3.1%. Anthraquinone with a relative dry pulp volume of 0.14%, and hemicellulose bioactive compound enzyme with a relative dry pulp volume of 1.4‰, are prepared into lye, and the scouring agent is produced by Qingdao Haiyi Fine Chemical Co., Ltd., HaiYi brand , the scouring agent model is SDO-A, and the hemicellulose bioactive compound e...

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Abstract

The invention relates to a preparation method of wood pulp for long viscose fibers. The method comprises the preparation steps of material preparation, alkali liquor preparation, screw pressing, stewing, washing, impurity removing and pulp preparation, wherein alkali liquor preparation comprises the following steps of: controlling the temperature at 30-40 DEG C and then separately adding 1-2% of sodium hydroxide, 0.2-0.25% of a scouring agent, 1.5-2% of hydrogen peroxide, 0.1-0.2% of anthraquinone and 0.1-0.2% of bioactive complex hemicellulase relative to the quantity of oven dry pulp to prepare alkali liquor. The prepared wood pulp has high alpha cellulose content, high yield, good reaction property and low content of non-fiber impurities and conforms to the quality requirement of the preparation of long viscose fibers. The COD (chemical oxygen demand) content in the discharged wastewater is 1000-1200mg / l, therefore the method belongs to low pollution, thus reducing the environmental pollution.

Description

technical field [0001] The invention relates to a pulping method, in particular to a method for preparing wood pulp for viscose long fibers by using papermaking grade wood pulp as a raw material. Background technique [0002] Most domestic enterprises use cotton pulp as the raw material for viscose fiber production. The resources of raw cotton linters are increasingly in short supply due to the constraints of planting area and growth cycle. With the development of viscose fiber industry and the expansion of production capacity, the shortage of raw materials has restricted the development of my country's viscose fiber industry. For this reason, some enterprises have used dissolving wood pulp for viscose production, but the high price and shortage of imported dissolving wood pulp have affected the normal operation and economic benefits of the enterprise. Finding a substitute for dissolving wood pulp is an important task for enterprises . [0003] At present, my country impor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21C3/22D21C5/00D01F2/06
Inventor 陈忠国曹知朋王维林臧贻朋郑春友吕兴华唐逢
Owner 山东银鹰股份有限公司
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