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A kind of classification method of lignin

A grading method, lignin technology, applied in lignin derivatives, chemical instruments and methods, organic chemistry, etc., can solve lignin physical and chemical properties and processing properties, process obstacles, reduce product application value, uneven structural properties, etc. problem, achieve good thermal stability, increase yield, and high activity

Active Publication Date: 2019-06-11
HAINAN JINHAI PULP & PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the physical and chemical properties, processing properties and technology of lignin have become obstacles to the current research on lignin.
For example, the polydispersity of lignin molecular weight leads to its inhomogeneous structure and performance, which easily leads to unstable product performance and reduces the application value of the product

Method used

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  • A kind of classification method of lignin
  • A kind of classification method of lignin
  • A kind of classification method of lignin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for classifying lignin, comprising the steps of:

[0023] S1. Filter the black liquor lignin through a plate-and-frame filter to separate lignin from alkali and inorganic salts to obtain crude lignin feed liquid, and dry to obtain crude lignin.

[0024] S2. Add crude lignin to pure water, pretreat it under the condition of high temperature liquid water at 160°C for 5 minutes, then place the container in cold water at 20°C for rapid cooling for 5 minutes, and use a rotary evaporator for the feed liquid after hydrothermal pretreatment The lignin powder is separated by vacuum distillation, and the lignin is degraded by water preheating, so as to improve the strength of subsequent classification treatment with alcohol-water mixture, improve the quality and yield of lignin, and use cold water to cool quickly to prevent Lignin is exposed to high temperature for a long time and the molecular structure of lignin is destroyed.

[0025] S3, lignin powder (2g) is dissolv...

Embodiment 2

[0030] A method for classifying lignin, comprising the steps of:

[0031] S1. Filter the black liquor lignin through a filter membrane with a filter hole of 0.1 nanometers to separate the lignin from alkali and inorganic salts to obtain a crude lignin feed solution, and dry to obtain crude lignin.

[0032] S2. Add crude lignin to pure water, pretreat it under high-temperature liquid water conditions at 130°C for 5 minutes, then place the container in cold water at 18°C ​​for rapid cooling for 5 minutes, and use a rotary evaporator for the feed liquid after hydrothermal pretreatment The lignin powder was obtained by distillation and separation under reduced pressure.

[0033] S3, lignin powder (3g) is dissolved respectively in the ethanol aqueous solution of 100ml (volume fraction of ethanol is respectively 40%, 50%, 65%, 75%, 85% and 95% v / v), stirs at different temperatures 5min, let it stand for 18 hours, filter with a G4 sand core funnel, and dry the filter residue (insolu...

Embodiment 3

[0037] A method for classifying lignin, comprising the steps of:

[0038] S1. Filter the black liquor lignin through a filter membrane with a filter hole of 10 nanometers to separate lignin from alkali and inorganic salts to obtain a crude lignin feed solution, and dry to obtain crude lignin.

[0039] S2. Add crude lignin to pure water, pretreat it under high-temperature liquid water at 110°C for 10 minutes, then place the container in cold water at 15°C for rapid cooling for 10 minutes. The lignin powder was obtained by distillation and separation under reduced pressure.

[0040] S3, lignin powder (5g) is dissolved respectively in the ethanol aqueous solution of 100ml (volume fraction of ethanol is respectively 40%, 50%, 65%, 75%, 85% and 95% v / v), stirs at different temperatures 5min, let it stand for 24 hours, filter with a G4 sand core funnel, and dry the filter residue (insoluble lignin) in an oven at 85°C to obtain high molecular weight lignin. The filtrate (soluble lig...

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Abstract

The invention provides a grading method of lignin. The grading method comprises the following steps: S1, filtering black liquor lignin to obtain coarse lignin liquid and drying to obtain coarse lignin; S2, adding the coarse lignin into pure water, pre-treating for 5-10 minutes under the condition of high-temperature liquid water of 110-150 DEG C, immediately putting into cold water for quick cooling, and separating the liquid after the completion of hydrothermal pretreatment to obtain lignin powder; S3, respectively dissolving the lignin powder in ethanol aqueous solutions with different ethanol contents, stirring within an azeotropic point of each of the aqueous ethanol solutions or under a temperature condition that is 10 DEG C lower than an azeotropic point, standing, filtering, respectively drying filter residues and filter liquor, and obtaining the graded lignin with different molecular weights. The grading method provided by the invention has the benefits that the graded lignin with the different molecular weights can be obtained, the content of active groups of the lignin is effectively improved, the polydispersity of the lignin is reduced, and the lignin is good in thermal stability, high in activity and high in yield.

Description

technical field [0001] The invention relates to the technical field of lignin pretreatment, in particular to a lignin classification method. Background technique [0002] Lignin has a complex structure and aromatic properties, and its structural unit is a phenylpropane-type, non-crystalline, three-dimensional polymer network compound. According to different plant species, lignin can be divided into three categories: coniferous wood, broad-leaved wood and herbaceous plant lignin. The cost of lignin is low, and lignin and its derivatives have multiple functions, and can be used as dispersants, adsorbents / desorbents, oil recovery aids, and asphalt emulsifiers. The most important contribution of lignin to human sustainable development lies in It provides a stable and continuous source of organic substances, and its application prospects are very broad. However, the physical and chemical properties, processing properties and technology of lignin have become obstacles to the cur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H7/00
CPCC07G1/00C08H6/00
Inventor 苏坚训
Owner HAINAN JINHAI PULP & PAPER
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