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A kind of concentrated sulfuric acid and toluenesulfonic acid catalyze the method for preparing high degree of substitution rice starch acetate

A technology of starch acetate and toluene sulfonic acid, which is applied in the field of starch deep processing, can solve the problems of starch degradation, expensive, and toxic toluene sulfonic acid, and achieve the effects of reduced total emissions, obvious price advantages, and low equipment corrosion

Active Publication Date: 2017-11-21
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the catalytic effect of liquid acid is good, but the liquid is highly corrosive, and will cause a certain amount of starch degradation, resulting in low yield
The substitution degree of the product produced by organic acid catalysis is low, which often cannot meet the requirements of some uses, and toluenesulfonic acid is poisonous, and direct discharge will cause serious environmental pollution
In recent years, although some studies have shown that the method of preparing acetate starch using a high ion liquid as a solvent can meet the requirements of high yield and good substitution degree, but limited to the expensive price of the ionic liquid, this method is not suitable for factory use

Method used

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  • A kind of concentrated sulfuric acid and toluenesulfonic acid catalyze the method for preparing high degree of substitution rice starch acetate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 100 parts of glacial acetic acid and pour it into 100 parts of rice starch, heat up to 75°C after fully stirring, add 250 parts of acetic anhydride, add 2 parts of concentrated sulfuric acid and 15 parts of toluenesulfonic acid into 100 parts of glacial acetic acid, and then mix the mixture Add it dropwise into the reaction system within 15 minutes, react for 2.5 hours, wash, filter with suction, dry in vacuum at 50°C for 24 hours, crush and sieve to obtain rice starch acetate with a substitution degree of 2.54.

Embodiment 2

[0027] Take 100 parts of glacial acetic acid and pour it into 100 parts of rice starch, heat up to 75°C after fully stirring, add 250 parts of acetic anhydride, add 3 parts of concentrated sulfuric acid and 15 parts of toluenesulfonic acid into 150 parts of glacial acetic acid, and then mix the mixture Add it dropwise into the reaction system within 15 minutes, react for 2.5 hours, wash, filter with suction, dry in vacuum at 50°C for 24 hours, crush and sieve to obtain rice starch acetate with a substitution degree of 2.61.

Embodiment 3

[0029] Take 150 parts of glacial acetic acid and pour it into 100 parts of rice starch, heat up to 80°C after fully stirring, add 250 parts of acetic anhydride, add 2 parts of concentrated sulfuric acid and 20 parts of toluenesulfonic acid into 140 parts of glacial acetic acid, and then mix the mixture Add it dropwise into the reaction system within 15 minutes, react for 2.5 hours, wash, filter with suction, dry in vacuum at 50°C for 24 hours, crush and sieve to obtain rice starch acetate with a substitution degree of 2.60.

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Abstract

The invention relates to a method for preparing rice starch acetate with high substitution degree by catalyzing concentrated sulfuric acid and toluenesulfonic acid. The present invention is to add a certain amount of rice starch and glacial acetic acid at room temperature, stir evenly and heat to a specified temperature range, slowly add acetic anhydride, then slowly add glacial acetic acid mixed with concentrated sulfuric acid and toluenesulfonic acid to react for a period of time, After washing, suction filtration, drying, crushing and sieving, the starch acetate product is obtained, and the degree of substitution can reach more than 2.5. The production process of the product is simple and applicable, the reaction efficiency is high, the output is high, and the degree of substitution is high, which greatly reduces the degradation of starch during the reaction process, reduces the corrosion of equipment, and reduces the degree of environmental pollution.

Description

technical field [0001] The invention relates to a method for preparing rice starch with a high degree of substitution by using a mixed catalyst of concentrated sulfuric acid and toluenesulfonic acid, belonging to the field of starch deep processing. Background technique [0002] The esterification of starch has significantly improved the various properties of starch, such as anticoagulation, transparency and other properties are better than the original starch products, has been widely used in food, paper, textile, adhesives and other industrial sectors. Starch acetate is the most common and heaviest esterified starch, and has certain thermoplasticity. Highly substituted starch acetate with excellent performance can be formed by hot pressing, molding and other methods to obtain corresponding plates and other forms of shaped products, and this starch is degradable, and its degradation products are also environmentally friendly. Most of the acetate starches with high substitu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B31/04
Inventor 于秋生刘忠义彭丽包浩陈婷乔丽娟
Owner JIANGNAN UNIV