Method for separating chemical components of grass family plants and purifying lignin

A gramineous plant and phytochemical technology, which is applied in the field of separating chemical components of gramineous plant straws and purifying lignin, can solve the problems of secondary pollution of chemicals, high requirements on experimental conditions, and complicated separation technology, and achieves the degree of polycondensation. Low, high yield, the effect of improving production efficiency

Inactive Publication Date: 2019-12-10
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is divided into four stages, which are relatively cumbersome. Chemicals are used in each stage, and this process may cause secondary pollution of chemicals
[0011] The existing technology for the separation of chemical components of grasses is relatively complicated, the requirements for experimental conditions are relatively high, and it is easy to cause secondary pollution

Method used

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  • Method for separating chemical components of grass family plants and purifying lignin
  • Method for separating chemical components of grass family plants and purifying lignin
  • Method for separating chemical components of grass family plants and purifying lignin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The total weight of the experiment is 200g, and the ratio of raw material weight to total weight is 1:10.

[0057] (1) Pulverization: select the dried gramineous plant stalks and pulverize them with a pulverizer to obtain gramineous plant stalk residues for subsequent use;

[0058] (2) Acid hydrolysis: take by weighing 20g of gramineous plant straw debris, 60g p-toluenesulfonic acid and 120g deionized water, wherein p-toluenesulfonic acid accounts for 30% of the total weight, and put the gramineous plant straw debris into a porous circle In the bottom flask, put p-toluenesulfonic acid and deionized water into the Erlenmeyer flask and stir evenly. Put the porous round bottom flask and the Erlenmeyer flask into the water bath at the same time, and fix them with a test tube rack, and heat them in the water bath to 80 ℃, add the p-toluenesulfonic acid solution in the Erlenmeyer flask to the porous round bottom flask, continue to stir for 30min, after the reaction is complet...

Embodiment 2

[0068] The total weight of the experiment is 200g, and the ratio of raw material weight to total weight is 1:10.

[0069] (1) pulverizing: method is with embodiment 1;

[0070] (2) Acid hydrolysis: take by weighing 20g of gramineous plant straw debris, 90g p-toluenesulfonic acid and 90g deionized water, wherein p-toluenesulfonic acid accounts for 45% of the total weight, and put the gramineous plant straw debris into a porous circle In the bottom flask, put p-toluenesulfonic acid and deionized water into the Erlenmeyer flask and stir evenly. Put the porous round bottom flask and the Erlenmeyer flask into the water bath at the same time, and fix them with a test tube rack, and heat them in the water bath to 80 ℃, add the p-toluenesulfonic acid solution in the Erlenmeyer flask to the porous round-bottom flask, continue stirring for 15 minutes, after the reaction is completed, add 200 g of deionized water to the porous round-bottom flask to obtain a fiber suspension, and set asid...

Embodiment 3

[0080] The total weight of the experiment is 200g, and the ratio of raw material weight to total weight is 1:10.

[0081] (1) pulverizing: method is with embodiment 1;

[0082] (2) Acid hydrolysis: Weigh 20g of gramineous plant straw debris, 120g p-toluenesulfonic acid and 60g deionized water, wherein p-toluenesulfonic acid accounts for 60% of the total weight, and put the gramineous plant straw debris into a porous circle In the bottom flask, put p-toluenesulfonic acid and deionized water into the Erlenmeyer flask and stir evenly, put the porous round bottom flask and the Erlenmeyer flask into the water bath at the same time, fix them with a test tube rack, and heat them in the water bath to 60 ℃, add the p-toluenesulfonic acid solution in the Erlenmeyer flask to the porous round bottom flask, continue to stir for 30min, after the reaction is completed, add 200g of deionized water to the porous round bottom flask to obtain a fiber suspension, and set aside;

[0083] (3) filt...

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Abstract

The invention provides a method for separating chemical components of grass family plants and purifying lignin. According to the method, grass family plant straw is taken as raw materials, the ligninis dissolved through an acid solubilizer, through the steps of filtering, washing, diluting, still standing and centrifuging, a cellulose solid product and a lignin sediment are obtained, and the sediment is subjected to dialysis to obtain the pure lignin. The convenient-to-recover acid solubilizer is utilized, thus the plant components can be effectively separated, the method is an environment-friendly technology, the chemical components of the grass family straw are separated under the condition of low temperature and short time, a high-temperature and high-pressure pressure vessel is not needed, the production cost can be saved, the production efficiency is improved, and energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of biomass energy, in particular to a method for separating chemical components of gramineous straw and purifying lignin. Background technique [0002] The excessive consumption of fossil fuels such as petroleum and coal mines has led to the continuous deterioration of the ecological environment, and it is difficult to regenerate fossil fuels. Lignocellulose comes from natural renewable plants. Cellulose is the most widely distributed and most abundant polysaccharide in nature, accounting for more than 50% of the carbon content in the plant kingdom, and is the most abundant renewable organic energy on the earth. The solid fiber components obtained after separation can be further developed and utilized by means of component separation, such as papermaking, monosaccharide production, methyl cellulose, cellulose ether, polymerized cellulose, etc.; the obtained lignin can be Through grafting or modification, et...

Claims

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Application Information

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IPC IPC(8): C08H7/00
CPCC08H6/00
Inventor 程金兰尹崇鑫翟华敏
Owner NANJING FORESTRY UNIV
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