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Method for extracting lignin by using hydrothermal and alkali synchronous activation method

A lignin and hydrothermal technology, applied in the direction of lignin derivatives, chemical instruments and methods, organic chemistry, etc., can solve the problems of increasing production raw materials and storage equipment, increasing waste water treatment costs, and high costs of ionic liquids, achieving effective Conducive to the conversion of high-value biomass, reduce pollution, and reduce the effect of treatment costs

Active Publication Date: 2018-11-06
CHONGQING TECH & BUSINESS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method avoids the degradation and decomposition of a small amount of cellulose and some hemicelluloses in the dilute acid pretreatment and steam explosion pretreatment methods, it still has the following deficiencies: (1) The method uses high-temperature cooking and Two steps of alkali washing are used to realize the separation of lignocellulose, and the waste liquid produced is waste water and waste acid, and the amount is large, which increases the cost of waste water treatment and increases production costs; (2) The hydrothermal method adopted in this method is high temperature The cooking method in a weak acid environment has low strength and can only degrade and dissolve part of hemicellulose and lignin; (3) Because the lignin content in straw is low and easy to extract, this method is only for crop straw and does not involve lignin High-content biomass treatment and its effect evaluation affect its application and promotion
[0006] Ethyl acetate is used as the extraction agent, and the use of organic solvents increases potential safety hazards in production, and waste liquid treatment increases production costs; (2) The cost of ionic liquids used is high, which increases production costs; (3) This method requires React in an oil bath at 260°C for 0.5~3h. The use of an oil bath will increase the production of raw materials and storage equipment, thereby increasing the cost of equipment

Method used

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  • Method for extracting lignin by using hydrothermal and alkali synchronous activation method
  • Method for extracting lignin by using hydrothermal and alkali synchronous activation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Biomass pretreatment

[0026] Use mulberry branches (leaves) (including perilla stalks, tobacco leaves, tobacco stalks, leftovers from the processing of honeysuckle leaves, etc.) as raw materials. First wash the raw materials with water, dry them in an oven at 60°C for 4 hours, and then crush them with a pulverizer, pass through a 80-mesh sieve, put them into sealed bags, and set aside.

[0027] (2) Hydrothermal alkali synchronous activation

[0028] After the first (1) step is completed, the ratio of the mass (g) of the raw material treated in the (1) step: the volume (ml) of the alkali solution is 1:15, and the (1) step is pretreated Put the raw materials and alkali solution into the hydrothermal reaction kettle, seal the reaction kettle after stirring evenly, then put the sealed hydrothermal reaction kettle into the temperature of 180 ℃ blast drying oven to react for 120 minutes, then take it out and cool it for 6 minutes, and finally use The suction filter pum...

Embodiment 2

[0034] A method for extracting lignin by a hydrothermal-alkali synchronous activation method, same as in Example 1, wherein:

[0035] In step (1), the number of mulberry branches is selected to be 40 mesh, the oven temperature is 45°C, and the drying time is 3 hours.

[0036] In step (2), the mass (g) of the raw material: the volume (ml) ratio of the alkali solution is 1:10, the NaOH concentration is 0.9mol / L, the oven temperature is 150°C, the reaction time is 100min, and the cooling time is 4min.

[0037]In step (3), the filtrate volume (ml):acid volume (ml) is 1:1, the volume concentration of HCl is 3%, and the standing time is 4min.

[0038] In step (4), the centrifugation time is 8 minutes, the rotation speed is 1800r / min, and the number of cleanings is 2 times. The drying time is 12h, and the temperature is 45°C.

Embodiment 3

[0040] A method for extracting lignin by a hydrothermal-alkali synchronous activation method, same as in Example 1, wherein:

[0041] In step (1), the number of mulberry branches is selected to be 60 mesh, the temperature of the oven is 85°C, and the drying time is 5 hours.

[0042] In step (2), the ratio of the mass (g) of the raw material: the volume (ml) of the alkali solution is 1:25, the NaOH concentration is 1.55mol / L, the oven temperature is 200°C, the reaction time is 150min, and the cooling time is 8min .

[0043] In step (3), the volume of filtrate (ml): volume of acid (ml) is 1:3, the volume concentration of HCl is 7%, and the standing time is 6 minutes.

[0044] In step (4), the centrifugation time is 12min, the rotation speed is 2200r / min, the number of washings is 4 times, the drying time is 18h, and the temperature is 85°C.

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Abstract

The invention discloses a method for extracting lignin by using a hydrothermal and alkali synchronous activation method, and belongs to the technical field of biomass extraction from pretreated lignin. According to the method, a product is prepared by taking biomass such as ramulus mori (leaves) as raw materials, and carrying out simple process of biomass pretreatment, hydrothermal and alkali synchronous activation, acid-adjusting and precipitation of the lignin and lignin extraction. The method has the characteristics that raw materials are easily obtained and have low price; the prepared lignin product has high recovery rate and small chemical modification; the production process is simple; by the use of dilute acid, the lignin precipitates and the acidity and alkalinity of an activationsolution can be neutralized, environmental protection is facilitated and the like. The method disclosed by the invention can be widely applied to lignin extraction and also can be used for extractinghigh value natural products in the biomass; the high value transformation of the biomass is realized.

Description

technical field [0001] The invention belongs to the technical field of extracting lignin from pretreated biomass, and in particular relates to a method for extracting lignin through hydrothermal synergistic alkali activation. Background technique [0002] Lignin is an aromatic natural polymer with a complex structure. It has a three-dimensional network space structure and is bonded with cellulose and hemicellulose to form the main support structure of plants. Because it is rich in active groups such as aromatic groups, phenolic hydroxyl groups, alcoholic hydroxyl groups, methoxyl groups, carbonyl groups, and conjugated double bonds, and is non-toxic, biodegradable, and biocompatible, it has attracted people's attention. Its applications are as follows: ①Synthetic hydrogel, used for new medical materials; ②Synthetic resin, surfactant, composite material, etc., used for the adsorption of heavy metals and agricultural water-retaining agent materials; ③As a delaying agent for se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00C07G1/00
CPCC07G1/00C08H6/00
Inventor 王星敏王莹王露谢宏杰
Owner CHONGQING TECH & BUSINESS UNIV
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