Water-soluble alkali lignin carboxylate and preparation method thereof

A technology of alkali lignin and carboxylate, which is applied in the field of water-soluble alkali lignin carboxylate and its preparation, can solve the problems of poor water solubility of products, increased content of carboxylic acid groups in difficult lignin, and high cost, and achieve broadening research Range, easy operation control, rich variety and application range of effects

Active Publication Date: 2011-09-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional methods of inserting carboxylic acid groups into lignin molecules have great limitations. It is difficult to greatly increase the content of carboxylic acid groups in lignin, and the product has poor water solubility, and the molecular structure of lignin is seriously degraded. Complex process and high cost
The limitations of the preparation methods of lignin-based carboxylates restrict the research and application of carboxylate-type lignin water-soluble polymers

Method used

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  • Water-soluble alkali lignin carboxylate and preparation method thereof
  • Water-soluble alkali lignin carboxylate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Take 200 grams of alkaline pulping straw pulp black liquor acid analysis alkali lignin (by weight percentage, solid content of 95%) and mix it with 400 grams of water, add sodium hydroxide to adjust the pH to 9.5, and then heat to 60 ℃, stir and dissolve fully, add 20 g of dimethylformamide, and perform an activation reaction at 75 ℃ for 1 hour to obtain a reaction solution. Dissolve the mixture of 10 grams of monochloroacetic acid and 5 grams of sodium monochloroacetate in 60 grams of water, add sodium hydroxide to adjust the pH to 8, and then add it dropwise to the reaction solution within 30~60 minutes for electrophilic substitution reaction. , adjust the pH to 10 with sodium hydroxide, and react at 70° C. for 3 hours after the dropwise addition is completed.

[0030] (2) Dissolve 25 grams of monochloroacetic acid in 55 grams of water, then add sodium hydroxide to adjust the pH to 8, and then add it dropwise to the reaction solution obtained in step (1) within 30...

Embodiment 2

[0032](1) Take 200 grams of alkaline pulping black liquor straw pulp acid analysis alkali lignin (in terms of weight percentage, solid content of 95%) and mix it with 433 grams of water, add sodium hydroxide to adjust the pH to 10, and then heat to 70 ℃ stirring and dissolving fully, adding 30 g of dimethylacetamide, and performing an activation reaction at 80 ℃ for 0.5 hours to obtain a reaction solution. Dissolve 30 grams of monobromoacetic acid in 70 grams of water, add sodium hydroxide to adjust the pH to 8, and then drop it into the reaction solution within 30 minutes to carry out electrophilic substitution reaction. During the dropwise addition, adjust the pH of the reaction solution with sodium hydroxide. The pH was 9.5, and after the dropwise addition was completed, the reaction was carried out at 60° C. for 2 hours.

[0033] (2) Dissolve 45 grams of monobromoacetic acid in 105 grams of water, then add sodium hydroxide to adjust the pH to 8, and then drop it into the r...

Embodiment 3

[0035] (1) Take 200 grams of alkaline pulping bamboo pulp black liquor acid analysis alkali lignin (in terms of weight percentage, solid content of 93%) and mix it with 400 grams of water, add sodium hydroxide to adjust the pH to 10.5, and then heat to 60 ℃ stirring and dissolving fully, adding 35 g of acetone, and performing an activation reaction at 85 ℃ for 1 hour to obtain a reaction liquid. Dissolve 21 grams of monoiodoacetic acid in 50 grams of water, add sodium hydroxide to adjust the pH to 8.5, and then drop it into the reaction solution within 60 minutes to carry out electrophilic substitution reaction. During the dropwise addition, adjust the pH of the reaction solution with sodium hydroxide. The pH was 10.5. After the dropwise addition was completed, the reaction was carried out at 75°C for 1.5 hours.

[0036] (2) Dissolve 49 grams of monoiodoacetic acid in 100 grams of water, then add sodium hydroxide to adjust the pH to 8.5, and then drop it into the reaction solu...

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Abstract

The invention discloses alkali lignin carboxylate and a preparation method thereof. A prescription of the modified raw material comprises the following components in parts by mass: 200 parts of alkali lignin, 20-50 parts of activating agent and 40-80 parts of carboxylic reagent; and the alkali lignin is bamboo pulp or straw pulp paper-making black liquid acid precipitating alkali lignin and has the solid content of 95 percent by mass. In the preparation, the alkali lignin is used as a main raw material, the activating agent and the carboxylic reagent are added, and the alkali lignin carboxylate is obtained by activating and electrophilic substitution reaction under basicity. By means of the preparation method, the water-soluble high molecule carboxylate is prepared by using alkali lignin with wide raw material source; and the prepared alkali lignin carboxylate has higher carboxyl content, favorable water solubility and strong surface activity. The alkali lignin carboxylate prepared by the preparation method disclosed by the invention has favorable hydrophilicity and surface activity, and the carboxyl contained in the molecules of the alkali lignin carboxylate has favorable chelating performance; and the alkali lignin carboxylate can be used as a functional auxiliary agent to be applied to a plurality of industrial fields and is a novel water-soluble lignin derivative.

Description

technical field [0001] The invention relates to a water-soluble alkali lignin carboxylate and a preparation method thereof. Specifically, a water-soluble alkali lignin carboxylate with high carboxyl content is prepared from bamboo pulp or straw pulp alkaline papermaking black liquor acid-analyzed alkali lignin as raw material, and undergoes alkali-catalyzed activation and electrophilic substitution reaction under normal pressure. salt. Background technique [0002] Lignin is the second largest natural renewable resource in nature and the main resource source for human beings in the future. At present, the lignin that can be used industrially mainly comes from the pulp and paper industry, and is mainly divided into soluble lignosulfonate and insoluble alkali lignin. Lignosulfonate is mainly obtained by concentrating papermaking red liquor by sulfite acid method, or by sulfonating alkali lignin; alkali lignin is obtained by acid analysis of alkali papermaking black liquor. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00
Inventor 邱学青周明松杨东杰庞煜霞楼宏铭易聪华邓永红甘林火
Owner SOUTH CHINA UNIV OF TECH
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