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Lignin color regulation and control method

A technology of lignin and color, applied in the field of lignin color control, can solve the problems of huge investment, less than 10% effective utilization rate, single chromaticity, etc., and achieve the effect of expanding application scenarios

Active Publication Date: 2022-08-09
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the effective utilization rate of lignin is less than 10%. The utilization rate is low and the investment is huge. Most of the lignin is burned to obtain heat energy, and the alkali can also be recovered in the process.
[0003] One of the reasons why industrial lignin cannot be efficiently utilized is that its chroma is dark and single, which is not easy to control and cannot adapt to the needs of different application scenarios

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for controlling lignin color, comprising the following steps:

[0031] (1) Take the dealkalized lignin and disperse it into a mixed solution of sodium hydroxide and dimethyl sulfate, control the concentration of the lignin in the solution to be 0.4 wt%, stir evenly, and react at room temperature for 2 hours; The concentration of sodium hydroxide is 0.5mol / L; the concentration of dimethyl sulfate is 1.5mol / L;

[0032] (2) Dissolving the lignin treated in step (1) in an aqueous solution of tetrahydrofuran (20% by volume of tetrahydrofuran), adding electrolyte sodium chloride, and dialysis at 30° C. for 2 d with a dialysis bag with a molecular weight cut-off of 8000 Daltons , collected to obtain light yellow lignin; the lignin concentration in the solution was 1wt%; the electrolyte concentration was 0.1mol / L;

[0033] (3) Add reddish-brown ferric ions to the light yellow lignin to complex with the lignin and adjust the light-colored lignin to be black.

Embodiment 2

[0035] A method for controlling lignin color, comprising the following steps:

[0036] (1) Take the dealkalized lignin and disperse it into a mixed solution of sodium hydroxide and dimethyl sulfate, control the concentration of the lignin in the solution to be 0.1 wt %, stir evenly, and react at room temperature for 2 to 5 hours; The concentration of sodium hydroxide in the mixed solution is 0.5mol / L; the concentration of dimethyl sulfate is 2mol / L;

[0037] (2) Dissolving the treated lignin in step (1) in an aqueous tetrahydrofuran solution (20% tetrahydrofuran volume concentration), adding electrolyte sodium chloride, and dialyzing at 30° C. for 2 d with a dialysis bag with a molecular weight cut-off of 10,000 Daltons , collected to obtain light yellow lignin; the lignin concentration in the solution was 1.5wt%; the electrolyte concentration was 0.15mol / L;

[0038] (3) Add reddish-brown ferric ions to the light yellow lignin to complex with the lignin and adjust the light-c...

Embodiment 3

[0040] A method for controlling lignin color, comprising the following steps:

[0041] (1) Take the dealkalized lignin and disperse it in a mixed solution of sodium hydroxide and dimethyl sulfate, control the concentration of the lignin in the solution to be 0.5 wt %, stir evenly, and react at room temperature for 2 to 5 hours; The concentration of sodium hydroxide in the mixed solution is 1mol / L; the concentration of dimethyl sulfate is 3mol / L;

[0042] (2) Dissolving the treated lignin in step (1) in an aqueous tetrahydrofuran solution (20% tetrahydrofuran volume concentration), adding electrolyte sodium chloride, and dialyzing at 30° C. for 2 d with a dialysis bag with a molecular weight cut-off of 10,000 Daltons , collected to obtain light yellow lignin; the lignin concentration in the solution was 1.5wt%; the electrolyte concentration was 0.5mol / L;

[0043] (3) Add reddish-brown ferric ions to the light yellow lignin to complex with the lignin and adjust the light-colore...

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Abstract

The invention discloses a lignin color regulation and control method which comprises the following steps: (1) dispersing dealkalized lignin into a mixed solution of sodium hydroxide and dimethyl sulfate, uniformly stirring, and reacting at normal temperature for 2-5 hours; (2) dissolving the lignin treated in the step (1) in a tetrahydrofuran solution, adding electrolyte, dialyzing at 20-60 DEG C for 2-4 days, and collecting to obtain light-color lignin; and (3) adding metal ions into the light-color lignin, complexing the metal ions with the lignin, and regulating and controlling the color of the light-color lignin. According to the method, the lignin is treated by using the alkaline solution of dimethyl sulfate, so that phenolic hydroxyl groups and LCC (lignin-carbohydrate complex) structures which are contained in the lignin and enable the lignin to present colors can be greatly reduced, and the light color of the lignin is realized. And after different metal ions are combined with the light-colored lignin, the lignin can be adjusted to present different colors through the chemical action of the metal ions and the light-colored lignin.

Description

technical field [0001] The invention belongs to the technical field of lignin color processing, and in particular relates to a method for regulating and controlling lignin color. Background technique [0002] Lignin is the second largest renewable resource in nature after cellulose. Plants produce about 150 billion tons of lignin annually through photosynthesis. In pulp and paper, bioethanol, textile and other cellulose-based industries, lignin is often discharged as a by-product. At present, the effective utilization rate of lignin is less than 10%, the utilization rate is low and the investment is huge. Most of the lignin is burned to obtain heat energy, and the alkali can also be recovered in the process. [0003] One of the reasons why industrial lignin cannot be efficiently utilized is that its chroma is deep and single, which is inconvenient to control and cannot meet the needs of different application scenarios. Therefore, there is an urgent need to develop a metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00
CPCC08H6/00
Inventor 姜曼胡翔洲周昱帆陆远潘宇王峰
Owner SOUTHWEST JIAOTONG UNIV
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