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Method for classified separation of straw components based on hydrothermal-binary catalytic ethanol method

A technology of fractional separation and hydrothermal method, which is applied in the fields of pulping with organic compounds, textiles and papermaking, papermaking, etc., to achieve the effect of reducing costs, reducing separation costs, and promoting high-value utilization

Inactive Publication Date: 2020-09-11
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the technical problems existing in the prior art, the present invention provides a method for the fractional separation of straw components based on the hydrothermal-binary catalytic ethanol method, so as to solve the problem that the existing separation methods cannot achieve Fractionation and separation of cellulose, hemicellulose and lignin in straw

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  • Method for classified separation of straw components based on hydrothermal-binary catalytic ethanol method
  • Method for classified separation of straw components based on hydrothermal-binary catalytic ethanol method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] When using the hydrothermal-binary catalytic ethanol method to fractionate the wheat straw components in Example 1, the following steps are included:

[0041] Step 1. Mix wheat straw and water at a solid-to-liquid ratio of 1:24g / mL, and perform hydrothermal treatment for 40 minutes at a temperature of 180°C to remove hemicellulose, and filter to obtain a hydrothermal solid-phase product and hydrolyzed liquid.

[0042] Step 2. Concentrate the hydrolyzate in step 1 at a concentration ratio of 80% to obtain a concentrate; use 90% ethanol alcohol precipitation concentrate to filter the alcohol precipitation solid phase product and filtrate A; wherein the alcohol precipitation ratio is 1:4.

[0043] Step 3. Under the condition of 80°C, the solid phase product of alcohol precipitation is dried by blowing at a constant temperature to obtain hemicellulose;

[0044] Step 4, add deionized water, hydrogen peroxide and sodium hydroxide in filtrate A, mix uniformly, obtain reactio...

Embodiment 2

[0051] When using the hydrothermal-binary catalytic ethanol method to fractionate the corn stalk components in Example 2, the following steps are included:

[0052] Step 1. Mix corn stalks and water at a solid-to-liquid ratio of 1:10g / mL, and perform a hydrothermal treatment at 130°C for 10 minutes to remove hemicellulose, and filter to obtain a hydrothermal solid-phase product and hydrolyzed liquid.

[0053] Step 2. Concentrate the hydrolyzate in step 1 at a concentration ratio of 85% to obtain a concentrate; use 80% ethanol alcohol precipitation concentrate to filter the alcohol precipitation solid phase product and filtrate A; wherein the alcohol precipitation ratio is 1:6.

[0054] Step 3. Under the condition of 80°C, the solid phase product of alcohol precipitation is dried by blowing at a constant temperature to obtain hemicellulose;

[0055] Step 4, add deionized water, hydrogen peroxide and sodium hydroxide in filtrate A, mix uniformly, obtain reaction solution; Main...

Embodiment 3

[0061] When utilizing the hydrothermal-binary catalytic ethanol method to fractionate the rice straw components in Example 3, the following steps are included:

[0062] Step 1. Mix rice straw and water at a solid-to-liquid ratio of 1:16g / mL. Under the condition of 150°C, perform hydrothermal treatment for 90 minutes to remove hemicellulose, and filter to obtain the solid phase product of hydrothermal method and hydrolysis liquid.

[0063] Step 2. Concentrate the hydrolyzate in step 1 at a concentration ratio of 60% to obtain a concentrate; use 95% ethanol alcohol precipitation concentrate to filter the alcohol precipitation solid phase product and filtrate A; wherein the alcohol precipitation ratio is 1:6.

[0064] Step 3. Under the condition of 80°C, the solid phase product of alcohol precipitation is dried by blowing at a constant temperature to obtain hemicellulose;

[0065] Step 4, add deionized water, hydrogen peroxide and sodium hydroxide in filtrate A, mix uniformly, ...

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Abstract

The invention discloses a method for classified separation of straw components based on a hydrothermal-binary catalytic ethanol method. The method comprises the following steps: firstly, carrying outhydrothermal treatment on straws; carrying out concentration and alcohol precipitation on the hydrolysate to obtain an alcohol precipitation solid-phase product and a filtrate A; drying the alcohol precipitation solid-phase product to obtain hemicellulose; preparing a reaction solution by utilizing the filtrate A; mixing the hydrothermal method solid-phase product with a reaction solution, and carrying out binary catalytic ethanol method treatment to obtain a binary catalytic ethanol method solid-phase product and a filtrate B; diluting and precipitating the filtrate B, and filtering the filtrate B to obtain lignin and filtrate C; and drying the binary catalytic ethanol method solid-phase product to obtain crude cellulose. According to the method, hemicellulose in the straw is removed by adopting a hydrothermal method, then lignin is removed by adopting a binary catalytic ethanol method, then filtrate obtained by adopting the binary catalytic ethanol method is diluted and precipitated,lignin is extracted, and fractional separation and extraction of hemicellulose, lignin and crude cellulose in the straw are realized; in addition, the separation and extraction process is simple, andthe extraction rate of straw components is high.

Description

technical field [0001] The invention belongs to the technical field of lignocellulosic biomass refining, and in particular relates to a method for fractionating straw components based on a hydrothermal-binary catalytic ethanol method. Background technique [0002] Lignocellulosic biomass resources on the earth are very rich, and the amount of resources that can be produced through photosynthesis every year is as high as 200 billion tons, but humans only use 3.5% of the total amount; among them, cellulose, hemicellulose and lignin three The separation of large components is one of the main technical bottlenecks restricting the large-scale utilization of lignocellulosic biomass resources. The traditional acid method, alkali method and organic solvent separation of biomass components all have certain disadvantages. On the one hand, they have great pollution to the environment; The removed hemicellulose and lignin have not been effectively separated, and still exist in the wast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/14C08H7/00D21C3/00
CPCC08B37/0003C08H6/00D21C3/003
Inventor 李金宝冯盼修慧娟李静宇黎金桂谢竺航赵欣张天聪李佩燚
Owner SHAANXI UNIV OF SCI & TECH