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Method for dissolving lignin based on gamma-valerolactone solvent systems

A technology of lignin and valerolactone, which is applied in the fields of lignin derivatives, chemical instruments and methods, organic chemistry, etc., can solve the problems of poor regularity of lignin dissolution, high requirements for liquid ammonia, complex and changeable diversity, etc., and achieve Effects that are conducive to continued use

Inactive Publication Date: 2017-10-24
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Through active exploration, the solvent systems that have been found to dissolve lignin have many shortcomings, such as the high volatility and toxicity of organic solvents, the strong alkalinity and strong corrosiveness of sodium hydroxide, the high cost and high viscosity of ionic liquids , Liquid ammonia has high requirements on equipment, etc., which makes these solvents have certain limitations in practical industrial applications
At the same time, the diversity of lignin sources and the complex variability of its composition lead to poor regularity of lignin dissolution on the one hand, and on the other hand, different lignins require solvent systems with different solubility properties.

Method used

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  • Method for dissolving lignin based on gamma-valerolactone solvent systems
  • Method for dissolving lignin based on gamma-valerolactone solvent systems
  • Method for dissolving lignin based on gamma-valerolactone solvent systems

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A certain quality of lignin (L0045, Lignin (Dealkaline), TCI, Shanghai) was added to the mixed solvent system of γ-valerolactone and water (wherein the mass percentages of γ-valerolactone and water were 10wt%, 30wt%, 50wt%, 70wt% and 90wt%), dissolved at 40°C, 50°C, 60°C and 70°C, respectively, with a stirring speed of 250rpm / min, kept for 2 hours, lignin was mixed in γ-valerolactone and water Solubility values ​​in solvents are listed in the table below.

[0027]

Embodiment 2

[0029] A certain quality of lignin (L0045, Lignin (Dealkaline), TCI, Shanghai) was added to a mixed solvent system of γ-valerolactone and DMSO (wherein the mass percentages of γ-valerolactone and DMSO were 10 wt%, 30wt%, 50wt%, 70wt% and 90wt%), dissolved at 40°C, 50°C, 60°C and 70°C respectively, stirring at 250rpm / min, keeping for 2 hours, lignin was mixed in γ-valerolactone and DMSO Solubility values ​​in solvents are listed in the table below.

[0030]

Embodiment 3

[0032] A certain quality of lignin (L0045, Lignin (Dealkaline), TCI, Shanghai) was added to the mixed solvent system of γ-valerolactone and DMF (wherein the mass percentages of γ-valerolactone and DMF were 10wt%, 30wt%, 50wt%, 70wt% and 90wt%), dissolved at 40°C, 50°C, 60°C and 70°C respectively, stirring speed 250rpm / min, kept for 2 hours, lignin was mixed in γ-valerolactone and DMF Solubility values ​​in solvents are listed in the table below.

[0033]

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Abstract

The invention relates to a method for dissolving a lignin based on gamma-valerolactone solvent systems, and belongs to the field of application of chemical industry. The method specifically comprises the following steps: adding the lignin into the gamma-valerolactone solvent systems, and effectively dissolving the lignin in the systems at different temperatures. The lignin solvent systems having different dissolving capacities are designed, and comprise gamma-valerolactone and another solvent. The dissolving capacities of the gamma-valerolactone solvent systems on the lignin are regulated through the types and the proportions of the mixed solvents. Finally, the lignin is recycled by adding an anti-solvent. The method is convenient, quick and green, the lignin is effectively dissolved in the solvent system through the mutual action of a hydrogen bond between the solvent and the lignin, the lignin is also separated by adding the anti-solvent, and the structure of the lignin is not obviously changed in the process. Therefore, the process has an important popularization value for the application of the lignin.

Description

technical field [0001] The invention relates to the application field of chemical industry, in particular to a method for dissolving lignin with a gamma-valerolactone-based solvent system. Background technique [0002] Lignin is an important component of lignocellulose. It is a renewable and extremely abundant polymer compound. Its molecular structure contains a large number of aromatic components, and it is the most abundant renewable aromatic carbon resource. However, most of the lignin has not been effectively utilized. With the increasingly prominent resource and environmental issues, the high-value utilization of lignin has attracted more and more attention. [0003] In the high-value utilization of lignin, acid / alkali treatment, high-temperature pyrolysis / gasification are often used to dissolve and degrade lignin, but these processes will produce a large number of carbonization by-products and salts that are difficult to separate. Therefore, searching for a suitable ...

Claims

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Application Information

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IPC IPC(8): C08H7/00
CPCC07G1/00C08H6/00
Inventor 薛智敏牟天成孙晓甫
Owner BEIJING FORESTRY UNIVERSITY