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A kind of method of utilizing wheat straw to prepare plant fiber

A technology of wheat straw and plant fiber, which is applied in the direction of pulping with inorganic alkali and pretreatment with acidic compounds, which can solve the problems of cellulose polymerization degree or molecular weight reduction, unfavorable deep processing utilization, environmental pollution, etc., to reduce consumption and save Raw materials and cost reduction effects

Inactive Publication Date: 2016-02-03
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Farmers often regard it as waste and even burn it on the spot, which not only causes environmental pollution, but also wastes resources
The preparation of plant fibers in my country mainly depends on wood, and my country is a country with scarce wood resources. The existing wood is difficult to meet the rapid development of the pulp industry (the main component of pulp is plant fiber) and other plant fiber utilization industries.
However, the autocratic pulping process will degrade the cellulose molecules, reducing the degree of polymerization or molecular weight of the cellulose, which is not conducive to further processing and utilization.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Sorting the wheat straw to remove impurities, and crushing to obtain 80-mesh straw powder raw material; add 5.00g of straw powder to a three-neck flask, add 77.00g of 15% sulfuric acid, stir for 5min to mix the powder raw material and acid solution evenly, and raise the temperature to 100 ℃, under vigorous stirring to make acid hydrolysis reaction for 90 minutes; then add 9.16g potassium hydroxide and 2.25g ammonia water with a mass concentration of 28%, stir for 5 minutes to make it evenly mixed, and continue to stir alkali hydrolysis reaction at 100℃ for 90 minutes, during which Connect the tail gas absorption device to absorb the released ammonia; then cool the material to 50°C and pour it into a beaker, then stir and cool to room temperature, filter, and wash with 10g of water 3 times each time to obtain a solid product.

[0018] The result measured according to the α-cellulose analysis method is: the α-cellulose content is 42.43%.

Embodiment 2

[0020] Sorting the wheat straw to remove impurities, and crushing to obtain 100-mesh straw powder raw material; add 5.00g of straw powder to a three-neck flask, add 77.00g of 15% sulfuric acid, stir for 5min to mix the powder raw material and acid solution evenly, and raise the temperature to 100 ℃, under vigorous stirring to make acid hydrolysis reaction for 90 minutes; then add 10.08g of potassium hydroxide and 2.25g of ammonia water with a mass concentration of 28%, stir for 5 minutes to make it evenly mixed, and continue to stir for 90 minutes at 100℃ for alkali hydrolysis reaction, during which Connect the tail gas absorption device to absorb the released ammonia; then cool the material to 50°C and pour it into a beaker, then stir and cool to room temperature, filter, and wash with 10g of water 3 times each time to obtain a solid product.

[0021] The result measured according to the α-cellulose analysis method is: the α-cellulose content is 48.84%.

Embodiment 3

[0023] Sorting wheat straw to remove impurities, and crushing to obtain 150-mesh straw powder raw material; add 5.00g of straw powder to a three-neck flask, add 77.00g of 15% sulfuric acid, stir for 5 minutes to mix the powder raw material and acid solution evenly, and heat up to 100 ℃, under vigorous stirring to make it acid hydrolysis reaction for 90min; then add 9.56g potassium hydroxide and 2.25g ammonia water with a mass concentration of 28%, stir for 5min to make it evenly mixed, and continue to stir at 100℃ for alkali hydrolysis reaction for 90min, during which Connect the tail gas absorption device to absorb the released ammonia; then cool the material to 50°C and pour it into a beaker, then stir and cool to room temperature, filter, and wash with 10g of water 3 times each time to obtain a solid product.

[0024] The result measured according to the α-cellulose analysis method is: the content of α-cellulose is 38.37%.

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Abstract

A method for preparing plant fiber from wheat straw comprises the following steps: using an agricultural byproduct wheat straw as a raw material, wherein the mass ratio of the straw to 15% sulfuric acid to potassium hydroxide to 28% aqueous ammonia is 1: 15.40: (1.83-2.02): 0.45; and performing acid hydrolysis, alkaline hydrolysis and solid-liquid separation to prepare the plant fiber. By virtue of characteristics of optimal preparation of the plant fiber from the wheat straw, a designed process route effectively combines the conventional mechanical and chemical methods, and the acid hydrolysis reaction of the sulfuric acid is performed, so that the reactivity of straw powder is enhanced, the alkaline hydrolysis reaction is easier, the using amount of the alkaline solution is reduced and the wastewater treatment is facilitated; the potassium hydroxide and the aqueous ammonia are used as alkaline hydrolysis solutions, so that the obtained wastewater mainly contains organic matters, potassium, nitrogen, sulfur and other elements which are nutrients needed by plants; after treatment, the wastewater can be used for agriculture irrigation, especially desert soil irrigation, so that soil nutrients can be increased and the problem of wastewater pollution can be effectively solved.

Description

technical field [0001] The invention belongs to the field of natural product extraction, that is, the field of preparation of natural cellulose substances, and in particular relates to a method for preparing plant fibers by utilizing wheat straw. technical background [0002] Wheat straw is a natural renewable resource, and its main components are hemicellulose, cellulose and lignin. Farmers often regard it as waste, or even burn it on the spot, which not only causes environmental pollution, but also wastes resources. The preparation of plant fibers in my country mainly depends on wood, and my country is a country with scarce wood resources. The existing wood is difficult to meet the rapid development of pulp industry (the main component of pulp is plant fiber) and other plant fiber utilization industries. However, the autocratic pulping process will degrade the cellulose molecules, reducing the degree of polymerization or molecular weight of the cellulose, which is not con...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/02D21C1/04
Inventor 石赟王世余
Owner LANZHOU UNIVERSITY
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