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Lignin solvent and preparation method therefor and application thereof

A technology for lignin and solvent, applied in the field of lignin solvent and its preparation, can solve the problems of high price, high viscosity and high temperature for separating lignin, and achieve the effects of strong practicability, saving raw materials and energy, and reducing investment cost

Inactive Publication Date: 2015-11-11
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantages of ionic liquids are that they are expensive, have high viscosity, and high temperature for lignin separation, which leads to increased mechanical strength and cost of mechanical stirring devices.

Method used

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  • Lignin solvent and preparation method therefor and application thereof
  • Lignin solvent and preparation method therefor and application thereof
  • Lignin solvent and preparation method therefor and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A lignin solvent comprising 50% water and 50% Tween 80 by weight. Take 50% water and 50% Tween 80 according to weight percentage, add Tween 80 into water, stir evenly to obtain lignin solvent.

[0022] The application of lignin solvent of the present invention in lignin separation and extraction specifically comprises the following steps: figure 1 A flow chart of the lignin separation and extraction method is shown:

[0023] 1) Pass 1 kg of lignin-containing rice straw through a crusher and a spherical mill in sequence to obtain crushed materials;

[0024] 2) Add the pulverized material into the stirring extraction tank filled with lignin solvent, and stir at room temperature for 2 hours to obtain a mixed slurry;

[0025] 3) Pump the mixed slurry after stirring and extraction into the sedimentation tank for solid-liquid separation. The liquid phase is lignin solution, and the solid phase is dried by a dryer to become crude cellulose product;

[0026] 4) Pump the lig...

Embodiment 2

[0032] A lignin solvent comprising 90% water and 10% Tween 80 by weight. Take 90% water and 10% Tween 80 according to weight percentage, add Tween 80 into water, stir evenly to obtain lignin solvent.

[0033] The application of lignin solvent of the present invention in lignin separation and extraction specifically comprises the following steps:

[0034] 1) Pass 1 kg of lignin-containing rice straw through a crusher and a spherical mill in sequence to obtain crushed materials;

[0035] 2) Add the pulverized material into the stirring extraction tank filled with lignin solvent, and stir at room temperature for 2 hours to obtain a mixed slurry;

[0036] 3) Pump the mixed slurry after stirring and extraction into the sedimentation tank for solid-liquid separation. The liquid phase is lignin solution, and the solid phase is dried by a dryer to become crude cellulose product;

[0037] 4) Pump the lignin solution into the washing extraction tank and stir for 30 minutes. The stirre...

Embodiment 3

[0044] A lignin solvent comprising 60% water and 40% Tween 80 by weight. Take 60% water and 40% Tween 80 according to weight percentage, add Tween 80 into water, stir evenly to obtain lignin solvent.

[0045] The application of lignin solvent of the present invention in lignin separation and extraction specifically comprises the following steps:

[0046] 1) Pass 1 kg of lignin-containing rice straw through a crusher and a spherical mill in sequence to obtain crushed materials;

[0047] 2) Add the pulverized material into the stirring extraction tank filled with lignin solvent, and stir at room temperature for 2 hours to obtain a mixed slurry;

[0048] 3) Pump the mixed slurry after stirring and extraction into the sedimentation tank for solid-liquid separation. The liquid phase is lignin solution, and the solid phase is dried by a dryer to become crude cellulose product;

[0049]4) Pump the lignin solution into the washing extraction tank and stir for 30 minutes. The stirred...

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Abstract

The invention relates to a lignin solvent and a preparation method therefor and application thereof. The lignin solvent comprises 50-90% by mass of water and 10-50% by mass of tween 80, wherein the tween 80 is a food additive, so that the lignin solvent has good properties of greenness and environmental protection and non-corrosiveness. Moreover, the lignin solvent can be used for separating and extracting lignin from straw stalks containing lignin at normal temperature without a heating device or high-pressure-resistant equipment, and the solvent without lignin can be recovered and recycled. Therefore, by separating and extracting lignin from straw stalks by using the lignin solvent, raw materials and energy sources can be saved, the investment is lowered, and the lignin solvent is low in cost, strong in practicality and easy to realize industrial popularization.

Description

technical field [0001] The invention relates to the technical field of lignin solvents, in particular to a lignin solvent and its preparation method and application. Background technique [0002] Lignin is one of the main components of the plant skeleton. The annual regeneration of lignin from the ecological cycle chain of plants in the world is about 50 billion tons. It is the second largest renewable and biodegradable resource in nature after cellulose. , is also the only environmentally friendly aromatic natural polymer compound in nature. Lignin can be used as an important chemical raw material. However, lignin is far from being fully utilized in the chemical industry, mainly because of the complexity, high cost or serious pollution of lignin separation and extraction in existing processes. At present, lignin is generally used as a by-product of wood hydrolysis industry and paper industry, and has become an environmental pollutant due to insufficient utilization. The ...

Claims

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Application Information

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IPC IPC(8): C08H7/00
Inventor 许爱荣徐航徐锐刘军娜时清亮
Owner HENAN UNIV OF SCI & TECH
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