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Preparation method of environment-friendly oxidized modified starch

An environmentally friendly, modified starch technology, applied in the chemical industry, can solve problems such as affecting product appearance and use effect, increasing sewage treatment requirements and costs, and instability of sodium hypochlorite, so as to reduce sewage treatment costs, reduce energy consumption, and achieve stable quality. Effect

Inactive Publication Date: 2013-11-06
SHOUGUANG GOLDEN FAR EAST MODIFIED STARCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oxidizing starch with sodium hypochlorite is cheap and the oxidation effect is good, but sodium hypochlorite is unstable and easily decomposes chlorine gas. Operators often feel dizzy due to chlorine pollution, and also increase the requirements and costs of sewage treatment; use permanganic acid Potassium is used as an oxidant, and the oxidized starch will turn brown after being stored for a period of time no matter under the condition of low pH value or high pH value, which seriously affects the appearance and use effect of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Corn oxidized starch:

[0021] 1000 parts of raw starch and 1600 parts of water are adjusted into starch milk, added to the mixer, and the stirring pump is started; 0.01% zinc sulfate is added as a catalyst, and 2% oxidant hydrogen peroxide (concentration is 20% ), and then adjust the pH to 8.0 with 2% sodium hydroxide solution, start to raise the temperature to 50 ℃, and keep the pH between 8.0 and 8.5 throughout the oxidation reaction. When the temperature of the starch emulsion reached 50 °C, the oxidation reaction was started for 4 h. After the reaction is over, add 0.003% sodium metabisulfite to stop the reaction, and neutralize to about pH 7 with 8% hydrochloric acid. During the oxidation reaction process, samples are taken every 1 h to detect viscosity, light transmittance and thermal stability, so as to control various properties of the product to meet the various requirements of users for the use of oxidized starch, and finally sieve and pack to obtain the pre...

Embodiment 2

[0024] Tapioca oxidized starch:

[0025] 1000 parts of tapioca raw starch and 1600 parts of water are transferred into starch milk, add mixer, start stirring pump; Add 0.03% ferric sulfate as catalyst, slowly add 0.5% oxidant hydrogen peroxide (concentration is 26 %), and then adjust the pH to 4.0 with 6% hydrochloric acid solution, start to raise the temperature to 35 ℃, and keep the pH between 4.0 - 4.5 throughout the oxidation reaction. When the temperature of the starch emulsion reached 35 °C, the oxidation reaction was started for 5 h. After the reaction is over, add 0.02% sodium sulfite to stop the reaction, and neutralize to about pH 7 with 10% sodium hydroxide. During the oxidation reaction process, samples are taken every 1 hour to test the viscosity, light transmittance and thermal stability, etc., so as to control the various properties of the product and meet the various requirements of users for the use of oxidized starch. Invented products.

[0026] Thermal st...

Embodiment 3

[0028] Oxidized starch mixed with corn and potato:

[0029] Mix 400 parts of corn raw starch, 600 parts of potato raw starch and 1600 parts of water into starch milk, add it to the mixer, start the stirring pump; add 0.01% copper sulfate as a catalyst, and slowly add 3% of the dry raw starch The oxidizing agent is hydrogen peroxide (concentration: 20%), then adjust the pH to 8.0 with 4% sodium hydroxide solution, start to heat up to 50°C, and keep the pH between 7.0 and 7.5 throughout the oxidation reaction. When the temperature of the starch emulsion reached 50 °C, the oxidation reaction was started for 3 h. After the reaction is over, add 0.002% sodium metabisulfite to dry the starch to terminate the reaction, and neutralize to about pH 7 with 15% hydrochloric acid. During the oxidation reaction process, samples are taken every 1 h to detect viscosity, light transmittance and thermal stability, so as to control various properties of the product to meet the various requireme...

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PUM

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Abstract

The invention belongs to the field of chemical technology, and more specifically relates to a preparation method of an environment-friendly oxidized modified starch. Equipment investment is not increased; hydrogen peroxide is used as an oxidizing agent; and an appropriate catalyst is added; so that part of the reducing chain ends of the starch are oxidized to carboxyl, glucose units based on 10 are removed because of the oxidation of each reducing chain end, and new reducing chain ends are induced until the oxidation is completed. Products with high purity and excellent effects are prepared by oxidation of starch with hydrogen peroxide, and excess hydrogen peroxide is decomposed into water. Hydrogen peroxide is an ideal green and environment-friendly oxidizing agent, and is capable of reducing sewage processing cost significantly.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method of environment-friendly oxidized modified starch. Background technique [0002] Starch is a natural high-molecular carbohydrate composed of multiple hydroxyglucose units produced by green plants through photosynthesis. Starch and its derivatives are very rich in resources, have low toxicity, are easily biodegradable, can be completely degraded in nature, and are extremely friendly to the environment. They have been widely used in many industrial fields such as food, textile, paper, petroleum, construction and medicine. However, with the continuous development of industrial production technology, the requirements for the properties of starch are becoming more and more stringent, and the defects in the structure and performance of native starch have seriously affected its practical application effect. Therefore, according to the structure...

Claims

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Application Information

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IPC IPC(8): C08B31/18
Inventor 孙敬善王增辉卢滋刘进忠
Owner SHOUGUANG GOLDEN FAR EAST MODIFIED STARCH CO LTD