Synthesis and Application of Pseudochitosan and Its Derivatives

A pseudo-chitosan and polymer technology, which is used in the synthesis and application of pseudo-chitosan and its derivatives, can solve the problems affecting the range and effect of the product, low solid yield, long reaction time, etc., and achieve product Wide range of uses, low production costs, and easy separation

Active Publication Date: 2020-06-09
XIAMEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the original process uses straw powder containing cellulose, hemicellulose, lignin or natural color paste to carry out the ammoniation reaction of the complex mixed product of biological macromolecules, sulfuric acid monoester salt, the degree of substitution can only reach about 0.3. The solid yield is low, and ammonia compounds with low substitution degrees are still easily soluble in water, which affects the range of use and effect of the product
The original ammoniation process has a long reaction time, accompanied by side reactions such as polymerization and decomposition

Method used

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  • Synthesis and Application of Pseudochitosan and Its Derivatives
  • Synthesis and Application of Pseudochitosan and Its Derivatives
  • Synthesis and Application of Pseudochitosan and Its Derivatives

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Cellulose sulfate was synthesized with microcrystalline cellulose as raw material and SO3 / DCE as sulfonating reagent. The concentration of SO3 is 1mnol / L, the ratio of moles of cellulose structural units to moles of SO3 is 3:8, the reaction time is 2h, and the reaction temperature is 25°C. After testing, the degree of sulfonation substitution of the prepared product was 0.96, which was used as a reaction intermediate for subsequent amination reaction.

Embodiment 2

[0070] Sodium cellulose sulfate (NaCS) is dissolved in the ammoniacal liquor of 28% by mass fraction by the consumption in the table, is placed in autoclave, and analysis conditions such as different reaction time, reaction temperature, reaction pressure affect the effect of 6-aminocellulose The influence of degree of substitution and yield, determine the optimal process conditions, see Table 2, Table 3, and Table 4 for the results of related experiments and comparative experiments.

[0071] Table 2: Effects of different reaction temperatures on the degree of substitution and yield of 6-aminocellulose

[0072]

[0073] Note: *The calculation method of substitution degree is DS=(ωN / 14) / (ωC / 72) (the same below)

[0074] *Add excess 1mol / l NaOH solution to the obtained purified product, heat at 90-100°C to remove free ammonia in the system (the same below)

[0075] From the results in Table 2, it can be seen that the degree of substitution and the yield of the reaction increa...

Embodiment 3

[0084] Sodium cellulose sulfate (NaCS) and different kinds of amination reagents are dissolved in 30g deionized water according to the amount in the table, placed in a high-pressure reactor, and reacted according to the experimental conditions in Table 5 and Table 6. Related experiments and See Table 5 and Table 6 for the results of the control experiment.

[0085] Table 5: Effects of different amination reagents on the degree of substitution and yield of 6-aminocellulose

[0086]

[0087]

[0088] As can be seen from the results in Table 5, different amination reagents have different degrees of substitution in the reaction, and the substitution effect of ammonia water and ethylenediamine as the amination reagent is better.

[0089] Table 6: Effects of different ratios of amination reagents on the degree of substitution and yield of 6-aminocellulose

[0090]

[0091] It can be seen from the results in Table 6 that the degree of substitution and the yield of the reactio...

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Abstract

The invention relates to synthesis and application of pseudo-chitosan and derivatives of the pseudo-chitosan. A novel production technology is proposed which cellulose or hemicellulose sulfuric acid monoester salt is used as raw material, under the presence of a catalyst carboxylate, ammonia substitution is conducted to synthesize a series of pseudo-chitosan products, and a technical breakthroughis made that pseudo-chitosan type products of 6-aminocellulose or 6-animohemicellulose and a mixture of the 6-aminocellulose and the 6-animohemicellulose are synthesized with the higher transformationrate and substitution degree in an aqueous solution in short time. According to the novel technology, by-products are less, the purity is high, and separation and purification are easy; by means of the technical breakthrough, a high-substitution degree pseudo-chitosan product or mixture obtained through simple and clean production is more feasible in the aspects such as economy, technologies andthe product quality, and the synthesized product 6-aminocellulose crude product or pure product can be applied in the wide fields such as glue, water-retaining agents, controlled release fertilizers and liquid leaf fertilizers.

Description

technical field [0001] The invention relates to a new synthesis process for producing a series of amino biomacromolecules through structural modification using biomass raw materials and product application development, belonging to the field of biomass processing industry, in particular to the synthesis and application of pseudochitosan and its derivatives. Background technique [0002] Chitin is the raw material for the production of chitosan. Existing chitosan is produced by de-N-acetylation of chitin. Chitosan is the only basic polysaccharide natural polymer compound containing amino groups in nature, and its structural formula is as follows: [0003] [0004] Chitosan is a glucose polymer formed by condensation of 2-glucosamine through 1-4 glycosidic bonds. It has good biological functions and can be used not only as a plant growth promoter, preservative, film-forming agent, antibacterial agent, and soil ecology Regulator, and has good adhesion, biocompatibility. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B15/06C08B5/14
CPCC08B5/14C08B15/06
Inventor 尹应武郑文斌郭伟任毅华吐松叶李艺师雪琴张海双
Owner XIAMEN UNIV
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