Method for preparing dissolved pulp by using straw or energy plants

A technology of energy plant and dissolving pulp, applied in the direction of pulping with organic compounds, pulping with inorganic alkali, multi-stage pulping process, etc., to achieve low equipment and factory management costs, mild treatment conditions, chemical reagent costs and waste liquid treatment The effect of low difficulty

Active Publication Date: 2019-04-19
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to the utilization of bamboo chips as non-wood raw materials, bagasse and asparagus can also be used to produce dissolving pulp, but due to factors such as geographical restrictions, they have not been used in large quantities for production (Yuan et al., Biotechnology for Biofuels, 2017, 10 (1),38)

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0026] Since the raw materials used in the preparation method of the present invention are crop waste stalks and energy plants, in order to facilitate the application, the raw materials can be pretreated and initially crushed so that the length of the raw material particles is not more than 3 cm, or according to the preparation method of the present invention The method requires a raw material pretreatment step to increase the uniformity of the raw material, wherein the uniformity of the raw material can be increased by selectively performing mechanical or chemical treatment, such as mechanical grinding with a disc mill, planetary ball mill, etc., or without affecting the subsequent treatment Under the premise of the process, add acid-base decomposing agent and other methods.

[0027]In step 2) of the preparation method according to the present invention, the pre-dipping treatment can remove extracts and ash in the raw material as much as possible by adding auxiliary agent A co...

Embodiment 1

[0040] A kind of preparation method of dissolving pulp for viscose fiber, concrete steps are as follows:

[0041] A. The air-dried corn stalks are preliminarily crushed so that the particle size and length of the crushed corn stalks are less than 3 cm for later use.

[0042] B. Carry out pre-soaking treatment to the crushed corn stalks, the treatment conditions are: solid-to-liquid ratio 1:9, temperature 70°C, based on the dry weight of corn stalks, the amount of EDTA is 0.3wt%, and the amount of sodium lauryl sulfate is 0.9wt%, the impregnation time is 70 minutes. After the treatment, squeeze out and recover the impregnation solution, and wash the raw material with 10 times its weight of water. After treatment under these conditions, the extract removal rate was 86%, and the ash removal rate was 69%.

[0043] C. Carry out improved hydrothermal treatment to the pre-impregnated and washed material, the treatment conditions are: solid-to-liquid ratio 1:9, temperature 115°C, ba...

Embodiment 2

[0048] A kind of preparation method of dissolving pulp for viscose fiber, concrete steps are as follows:

[0049] A. Preliminarily crush the air-dried straw so that the particle size and length of the crushed straw are less than 3 cm for later use.

[0050] B. Pre-impregnate the crushed wheat straw. The treatment conditions are: solid-liquid ratio 1:10, temperature 85°C, based on the dry weight of the material, the amount of EDTA is 0.35wt%, the amount of Span20 is 1.2wt%, and the impregnation time for 80 minutes. After the treatment, squeeze out and recover the impregnation solution, and wash the raw material with 10 times its weight of water. After treatment under these conditions, the extract removal rate was 87%, and the ash removal rate was 67%.

[0051] C. Carry out improved hydrothermal treatment to the pre-impregnated and washed material, the treatment conditions are: solid-to-liquid ratio 1:10, temperature 125°C, based on the dry weight of the material, the amount o...

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Abstract

The invention discloses a method for preparing dissolved pulp by utilizing straw and energy plants, and the method comprises the following steps: 1) raw material pretreatment, 2) pre-impregnation treatment, 3) hydro-thermal treatment, 4) mild alkali treatment; 5) refining treatment and the like. According to the method, a whole set of novel dissolved pulp preparation process is designed to aim atthe raw material characteristics of crop straw raw materials and energy plants, and more choices are provided for the high-value utilization of the raw materials; the method is simple in process steps, the equipment and the factory management cost are low; the treatment conditions are relatively mild, the use amount of chemical reagents is small, the production energy consumption is reduced, the chemical reagent cost and the waste liquid treatment difficulty are low; a simple treatment process and a mild reaction condition are adopted, and excessive degradation of cellulose is reduced, so thatthe alpha-cellulose content, cellulose polymerization degree, purity and product yield are improved or stabilized.

Description

technical field [0001] The invention relates to the field of biomass reuse, in particular to a method for preparing dissolving pulp (high-purity cellulose) for producing viscose fiber, tencel (Lyocell fiber) and other cellulose derivative products. Background technique [0002] Dissolving pulp is a kind of high-purity cellulose. It is an important intermediate product for the production of viscose fiber, acetate fiber, nitrocellulose and cellulose ether. The raw materials for domestic production of viscose fiber are mainly dissolving pulp from cotton pulp and wood pulp, including a small amount of dissolving pulp from bamboo pulp. In recent years, due to the reduction of cotton planting area, the use of wood pulp has increased year by year, and the demand for dissolving pulp in my country has also increased year by year. In 2015, my country imported more than 2 million tons of dissolving pulp, and the import volume has increased at an annual rate of 14-17% in recent years. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/00D21C3/02D21C3/26D21C9/10D21C9/14D21C9/16D21C1/00
CPCD21C1/00D21C3/003D21C3/02D21C3/022D21C3/26D21C9/10D21C9/142D21C9/163
Inventor 李滨刘兆彦刘超王东张跃冬马君志王乐军
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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