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A kind of method for preparing rice starch acetate catalyzed by immobilized heteropolyacid

A technology of immobilizing heteropoly acid and starch acetate, which is applied in the field of starch deep processing, can solve the problems of high environmental hazards, low economic benefits, equipment damage, etc., and achieve low equipment damage, high esterification efficiency, and high esterification degree Effect

Active Publication Date: 2016-06-08
广西利佰兴食品集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although starch acetate with a high degree of substitution meeting the requirements can be produced, concentrated sulfuric acid will not only degrade the starch, resulting in a low yield, but also cause damage to the equipment and cause great harm to the environment.
In recent years, it has been reported that organic acid, iodine, etc. are used as catalysts to prepare highly substituted acetate starch. Although the yield obtained is high, it is difficult to recover the catalyst and the economic benefit is low.

Method used

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  • A kind of method for preparing rice starch acetate catalyzed by immobilized heteropolyacid
  • A kind of method for preparing rice starch acetate catalyzed by immobilized heteropolyacid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Use activated carbon with Keggin structure as a carrier, take 9 parts of activated carbon, mix 3 parts of phosphotungstic acid with 60 parts of sulfuric acid solution with a concentration of 1mol / L, heat the activated carbon with it and reflux for 12 hours, place it for one day, and bake it at 140°C dry to obtain the desired solid-supported catalyst.

[0024] Weigh 10 parts of rice starch, add 25 parts of glacial acetic acid, stir at room temperature for 3 minutes to make it evenly mixed, add 3 parts of solid-loaded heteropolyacid and 25 parts of acetic anhydride in a constant temperature water bath at 75°C, and react for 2 hours , suction filtration, the filtrate was poured into 1L distilled water, a large amount of starch was separated out, washed, extracted, vacuum-dried at 40°C, ground and sieved to obtain rice starch acetate with a degree of substitution of 2.51.

Embodiment 2

[0026] Use activated carbon with a Keggin structure as a carrier, take 11 parts of activated carbon, mix 4 parts of phosphomolybdic acid with 50 parts of sulfuric acid solution with a concentration of 0.5mol / L, and heat the activated carbon with it for 12 hours and then place it for one day at 140°C drying to obtain the desired solid-supported catalyst.

[0027] Weigh 10 parts of rice starch, add 27 parts of glacial acetic acid, stir at room temperature for 3 minutes to make it evenly mixed, and add 4 parts of solid-loaded heteropoly acid and 30 parts of acetic anhydride in an environment of constant temperature water bath at 80°C, and react for 2.5 hours , suction filtration, the filtrate was poured into 1L distilled water, a large amount of starch was separated out, washed, extracted, vacuum-dried at 40°C, ground and sieved to obtain rice starch acetate with a degree of substitution of 2.65.

Embodiment 3

[0029] Use activated carbon with a Keggin structure as a carrier, take 12 parts of activated carbon, mix 5 parts of phosphovanadic acid with 60 parts of sulfuric acid solution with a concentration of 1mol / L, heat the activated carbon with it for 12 hours, place it for one day, and bake it at 140°C dry to obtain the desired solid-supported catalyst.

[0030] Weigh 10 parts of rice starch, add 20 parts of glacial acetic acid, stir at room temperature for 3 minutes to make it evenly mixed, and add 3 parts of recovered solid-loaded heteropolyacid and 25 parts of acetic anhydride in an environment of constant temperature water bath at 70°C, and react After 2 hours, filter with suction, pour the filtrate into 1L of distilled water, precipitate a large amount of starch, wash, extract, vacuum-dry at 40°C, grind and sieve to obtain rice starch acetate with a substitution degree of 2.50.

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Abstract

The invention discloses a method for preparing rice starch acetate catalyzed by a solid-carrying heteropolyacid. The method mainly includes the following steps: preparation of activated carbon immobilized heteropolyacid catalyst; using glacial acetic acid as solvent and acetic anhydride as esterification agent, under the catalysis of immobilized heteropolyacid, at a temperature of 70-80°C and react for 2 to 3 hours; the first suction filtration recovers the immobilized heteropolyacid; the filtrate is poured into a large amount of distilled water for washing, and the second suction filtration obtains the product, which is then dried in a vacuum environment, ground, and filtered Sieve to obtain rice starch acetate with a degree of substitution of more than 2.5 and a high degree of substitution up to 2.7. The method of the invention has the characteristics of high reaction efficiency, recyclable and reusable catalyst, green safety and the like.

Description

Technical field: [0001] The invention relates to a method for preparing rice starch acetate with a high degree of substitution using a solid-carried heteropolyacid as a catalyst, and belongs to the field of starch deep processing. technical background: [0002] Rice is my country's largest food source, accounting for about 30% of the world's output, with a total annual output of about 180 million tons. In the rice processing process, due to the existing rice milling technology, it is inevitable to produce broken rice. According to statistics, at least 20 million tons of broken rice are produced every year in my country, and these broken rice are usually used to produce feed, and their economic value is very low. Therefore, the deep processing and utilization of rice starch is of great significance. [0003] Due to its low price, abundant sources, renewable and biodegradable properties, starch has a wide range of uses in many industrial productions. However, natural starch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B31/04
Inventor 刘忠义包浩彭丽乔丽娟陈婷刘令
Owner 广西利佰兴食品集团有限公司
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