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Method for preparing dissolving pulp and other high-value-added products by crop straws

A high value-added, crop straw technology, applied in the direction of using inorganic alkali pulping, multi-stage pulping process, using microorganism/enzyme cellulose treatment, etc. Quality, environmental pollution and other issues, to achieve the effect of promoting industrial production, broadening the scope of materials, and avoiding serious pollution

Active Publication Date: 2017-05-10
JINAN MIDUOTAN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two patents are just simple pulping, without comprehensive utilization of hemicellulose and lignin with higher economic added value, thus failing to efficiently utilize straw resources and causing certain environmental pollution
The outstanding feature of this method is that the lignin in the straw is comprehensively utilized while preparing the dissolving pulp; however, the method of pre-hydrolysis rather than pre-extraction is more used for hemicellulose, so the hemicellulose cannot be fully utilized. This precious resource has brought new pollution to the environment
In addition, in the prior art, straw is used to prepare dissolving pulp, and acidic media or acidic additives are used, and dissolving pulp and lignin will undergo hydrolysis and peeling reactions, which cannot guarantee the integrity and high quality of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A method for preparing dissolving pulp and other high value-added products from crop stalks, comprising the steps of:

[0044] 1. Preparation of dissolving slurry

[0045] 1) The leaves and ears of wheat straw are removed, and the straw after removal of leaves and ears is removed, dusted, shredded, cut into sections (2-3cm), washed with water, and put into a cooking pot;

[0046] 2) Add water 10 times the weight of the straw into the cooking pot, add ammonia water until the mass concentration of the lye is 7%; add steam to the cooking pot to raise the temperature to 95°C, pass inert gas nitrogen into the cooking pot, and cook The air in the pot is exhausted; then steam and inert gas are intermittently introduced into the cooking pot to maintain the temperature in the cooking pot at 95°C and the pressure at 0.8MPa, and keep the temperature and pressure for 60 minutes;

[0047] In this step, most of the hemicellulose can be extracted and most of the siliceous and other i...

Embodiment 2

[0073] A method for preparing dissolving pulp and other high value-added products from crop stalks, comprising the steps of:

[0074] 1. Preparation of dissolving slurry

[0075] 1) Remove the leaves and ears of the corn stalks. After removing the leaves and ears, the straws are cleaned of impurities, dust, shredded, cut into sections (4-5cm), washed with water, and put into a cooking pot;

[0076] 2) Add water with 13 times the weight of straw to the cooking pot, add potassium hydroxide until the mass concentration of the lye is 5%; pass steam into the cooking pot to raise the temperature to 85°C, and pass inert gas nitrogen into the cooking pot, Evacuate the air in the cooking pot; then intermittently pass steam and inert gas into the cooking pot to maintain the temperature in the cooking pot at 85°C and the pressure at 0.6MPa, and keep the temperature and pressure for 80 minutes;

[0077] In this step, most of the hemicellulose can be extracted and most of the inorganic sa...

Embodiment 3

[0103] A method for preparing dissolving pulp and other high value-added products from crop stalks, comprising the steps of:

[0104] 1. Preparation of dissolving slurry

[0105] 1) Remove the leaves and husks of the cotton stalks. After removing the leaves and husks, the cotton stalks are cleaned of impurities, dust, shredded, cut into sections (3-4cm), washed with water, and put into a cooking pot;

[0106] 2) Add water 12 times the weight of straw into the cooking pot, add ammonia water, until the mass concentration of lye is 6%; pass steam into the cooking pot to raise the temperature to 90°C, and pass inert gas nitrogen into the cooking pot to cook The air in the pot is exhausted; then steam and inert gas are intermittently introduced into the cooking pot to maintain the temperature in the cooking pot at 90°C and the pressure at 0.7MPa, and keep the temperature and pressure for 70 minutes;

[0107] In this step, most of the hemicellulose can be extracted and most of the ...

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PUM

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Abstract

The invention discloses a method for preparing dissolving pulp and other high-value-added products by crop straws, and belongs to the technical field of biology. The method includes the steps: pre-extracting hemicellulose and ash inorganic salt by the aid of alkali liquor; hydrolyzing protein and starch by the aid of enzyme method; extracting lignin and residual hemicellulose by the aid of alkali solution; removing step by step the residual hemicellulose, the lignin and dissolved out fatty substances by the aid of hydrogen peroxide and organic solvents; keeping inert gas environments in a cooking boiler to prevent oxidation reaction of components such as the dissolving pulp and esterification reaction of acetyl and the like; avoiding peeling reaction, dehydration reaction, hydrolysis reaction and the like at the high temperature of the components such as the dissolving pulp by the aid of low cooking temperature; providing higher pressure by inert gas to ensure seven technical measures such as effective permeability of the alkali liquor between cell walls of the straws to obtain superior dissolving pulp of the straws. According to the method, the straws are furthest comprehensively utilized, the dissolving pulp, the hemicellulose and the lignin are high in extraction rate and quality and good in integrity, and liquid fertilizers can be obtained.

Description

technical field [0001] The invention relates to the field of biotechnology, in particular to a method for preparing dissolving pulp and other high value-added products by using crop stalks. Background technique [0002] Dissolving pulp is a high-purity refined cellulose pulp, mainly used for the production of high-end paper, regenerated cellulose fibers such as viscose fiber (rayon), nitrocellulose, cellulose acetate, cellophane, carboxymethyl cellulose and other cellulose derivatives, etc. . [0003] Currently, the raw materials for making dissolving pulp are mainly cotton linters and wood. Due to the unstable price and supply of cotton linters and the serious shortage of forest resources in our country, it is urgent for our country to use other cellulose resources to replace wood and cotton linters to prepare dissolving pulp, and it has obvious economic benefits. social and environmental benefits. [0004] my country can harvest more than 900 million tons of crop straw ...

Claims

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Application Information

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IPC IPC(8): D21C3/26D21C3/02D21C9/16D21C5/00C08B37/14C08H7/00C05F7/00
CPCC05F7/00C08B37/14C08H6/00D21C3/02D21C3/26D21C5/005D21C9/163Y02A40/20
Inventor 曹吉祥
Owner JINAN MIDUOTAN NEW ENERGY TECH