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Preparation method of reed or straw cellulose pulp

A technology of straw cellulose and reed, which is applied in the field of cellulose pulp preparation, can solve the problems of long process flow, complex production method, serious pollution, etc., and achieve the goal of shortening the process flow, benefiting clean production and environmental protection Effect

Inactive Publication Date: 2010-06-16
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Throughout the current cellulose pulp preparation methods, a large amount of sodium hydroxide and hypochlorite are required. The production method is complicated, the process is long, and the pollution is serious, which is difficult to meet the needs of production development.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Reed (containing 3.10% ash, 19.17% lignin, 12.78% pentosan, 48.08% cellulose in its chemical composition) is cut into 20-25mm long pieces, and 50g of reed raw material through screening is used with a mass concentration of 5% hydrochloric acid, at 40 ℃, bath ratio 1: 6 conditions of soaking treatment for 10 hours; after pre-soaking, extrude excess pre-soaking liquid, so that the moisture content of reed crude fiber is controlled at about 100%, and then placed in steam In the explosion tank, close the container and quickly increase the pressure to the predetermined 2.7Mpa. The steam explosion medium is water vapor. When the pressure of the flasher is constant, the pressure will be released instantly after 120 seconds of pressure keeping, so that the raw material enters the receiving container under the action of pressure difference. During the process, the steam explosion raw materials were collected and washed with water. The reed raw material treated by steam explosion...

Embodiment 2

[0024] Corn stalks (containing 6.1% ash, 17.54% lignin, 20.6% pentosan and 41.3% cellulose in its chemical composition) were cut into 20-25mm long pieces, and 50g of the screened corn stalks were Concentration is 17.5% sodium hydroxide at room temperature, under the condition of bath ratio 1: 8 soaking treatment 1 hour, extrude excess presoaking liquid after presoaking, make the moisture content of corn stalk crude fiber control at about 100%, then Put it in the steam explosion tank, close the container, and quickly increase the pressure to the predetermined 1.0Mpa. The steam explosion medium is nitrogen. When the pressure of the flasher is constant, the pressure is released instantly after 300 seconds of pressure, so that the raw materials enter under the action of pressure difference. In the receiving container, collect the steam explosion raw materials and wash them with water. The corn stalk raw material treated by steam explosion was treated in a flask with ethylene glyco...

Embodiment 3

[0027] Wheat straw (containing 6.04% ash, 18.34% lignin, 22.56% pentosan, 40.40% cellulose in its chemical composition) is cut into 20-25mm long pieces, and 50g of wheat straw raw material through screening is used with a mass concentration of Soak in 1% sulfuric acid at 50°C and bath ratio 1:20 for 48 hours, squeeze out excess presoak after presoaking, so that the moisture content of wheat straw crude fiber is controlled at about 100%, and then place it in steam explosion In the tank, close the container, quickly increase the pressure to the predetermined 5.0Mpa, and the steam explosion medium is carbon dioxide. When the pressure of the flasher is constant, the pressure will be released immediately after holding the pressure for 10 seconds, so that the raw material enters the receiving container under the action of the pressure difference. Collect steam explosion raw materials and wash them with water. The wheat straw raw material treated by steam explosion was treated in a f...

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PUM

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Abstract

The invention belongs to a technical field of chemical fiber, in particular to a preparation method of cellulose pulps of reed or straw and the like. The method comprises the following steps of: firstly, carrying out steam explosion treatment on reed or straw raw materials in steam explosion treatment equipment, secondly, washing raw materials of reed or straw and the like after steam explosion treatment with water, and soaking the washed materials in an organic solvent for treatment to finish cellulose pulping technology. The technology utilized by the invention has obvious advantages of shortening the technological process, saving energy, protecting the environment (the organic solvent can be recycled by distilling to reutilize), and being beneficial to clean production and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of chemical fibers, and particularly relates to a method for preparing cellulose pulp such as reeds or straws, which uses steam explosion pretreatment, and then treats plant fiber raw materials such as reeds or straws with an organic solvent. Background technique [0002] At present, regenerated cellulose fibers are mostly prepared from cotton pulp, wood pulp, and bamboo pulp through viscose or solvent methods. However, with the increasing shortage of forest resources, the reduction of arable land and the limitation that bamboo pulp can only be used for three years, it has become a top priority to find and develop new raw materials to make cellulose pulp. [0003] Phragmites reed is widely distributed in northern my country and is a high-yielding plant that grows naturally. At the same time, my country is a large agricultural country with considerable crop straw resources. Therefore, making full use of reso...

Claims

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Application Information

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IPC IPC(8): D21H11/12D21B1/06D21B1/36D21C1/00
Inventor 刘必前汪前东陆建雄李兰吴杰
Owner INST OF CHEM CHINESE ACAD OF SCI
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