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A kind of diethylene glycol lignin solvent and lignin separation and extraction method

A diethylene glycol and lignin technology, applied in the field of lignin solvents, can solve the problems of high price, high viscosity, and high temperature for lignin separation, and achieve the effects of saving raw materials and energy, strong practicability, and reducing investment costs

Inactive Publication Date: 2017-06-16
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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  • A kind of diethylene glycol lignin solvent and lignin separation and extraction method
  • A kind of diethylene glycol lignin solvent and lignin separation and extraction method
  • A kind of diethylene glycol lignin solvent and lignin separation and extraction method

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Embodiment 1

[0020] A diethylene glycol lignin solvent comprises 20% water and 80% diethylene glycol by weight. Take 20% water and 80% diethylene glycol according to weight percentage, add diethylene glycol into water, stir evenly to obtain lignin solvent.

[0021] A method for separating and extracting lignin using a lignin solvent, specifically comprising the following steps: figure 1 A flow chart of the lignin separation and extraction method is shown:

[0022] 1) Pass 1 kg of lignin-containing cotton stalks through a crusher and a spherical mill in sequence to obtain pulverized materials;

[0023] 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;

[0024] 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; ...

Embodiment 2

[0031] A lignin solvent comprising 40% water and 60% diethylene glycol by weight. Take 40% water and 60% diethylene glycol according to weight percentage, add diethylene glycol into water, stir evenly to obtain lignin solvent.

[0032] A method for separating and extracting lignin using a lignin solvent, specifically comprising the following steps:

[0033] 1) Pass 1 kg of lignin-containing cotton stalks through a crusher and a spherical mill in sequence to obtain pulverized materials;

[0034] 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;

[0035] 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;

[0036] 4) Pump the lignin solution into the washing extraction tank and stir for 30 minutes. T...

Embodiment 3

[0042] A lignin solvent comprising 30% water and 70% diethylene glycol by weight. Take 30% water and 70% diethylene glycol according to weight percentage, add diethylene glycol into water, stir evenly to obtain lignin solvent.

[0043] A method for separating and extracting lignin using a lignin solvent, specifically comprising the following steps:

[0044] 1) Pass 1 kg of lignin-containing cotton stalks through a crusher and a spherical mill in sequence to obtain pulverized materials;

[0045] 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;

[0046]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;

[0047] 4) Pump the lignin solution into the water washing extraction tank and stir for 30 minut...

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Abstract

The invention relates to a diethylene glycol lignin solvent and a lignin separation and extraction method. The lignin solvent comprises 20-40% by mass of water and 60-80% by mass of diethylene glycol, wherein 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 diethylene glycol lignin solvent and a lignin separation and extraction method. 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 insufficie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H7/00
Inventor 许爱荣徐锐赵爽吴峰敏刘翠云
Owner HENAN UNIV OF SCI & TECH
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