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A method for preparing carboxymethyl rice starch by continuous feed method

A technology of rice starch and carboxymethyl, which is applied in the field of preparation of carboxymethyl rice starch, can solve the problems of low product yield, low degree of substitution, unstable reaction system, etc., achieve high degree of product substitution and improve stability , easily controlled effects

Active Publication Date: 2016-04-13
广西利佰兴食品集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the existing technical water medium method for the carboxymethylation of new raw material rice starch, the reaction system is unstable, the viscosity of the reaction system increases too fast, and the problem of agglomeration leads to low product yield, the reaction cannot be carried out normally, and the degree of substitution Not high problems, the invention provides a method for preparing carboxymethyl rice starch by continuous feed method

Method used

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  • A method for preparing carboxymethyl rice starch by continuous feed method
  • A method for preparing carboxymethyl rice starch by continuous feed method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In terms of parts by mass, add 55 parts of NaOH and 6 parts of catalyst cetyltrimethylammonium bromide to 100 parts of rice starch, pour 1200 parts of isopropanol solution and 55 parts of distilled water, and the stirring speed is 200r / min Fully stir and heat in a water bath at 50°C for 35 minutes to fully alkalinize the starch, then heat up to 60°C, and then add a total of 150 parts of isopropanol mixed with 80 parts of chloroacetic acid as follows, firstly Add 35 parts of the mixed solution at one time, immediately adjust the stirrer to 500r / min and stir for 5min, adjust the stirrer speed to 300r / min, continue the reaction for 15min, add 10 parts of NaOH particles to maintain an alkaline reaction environment, and then continue the reaction for 15min Finally, add the remaining mixed solution continuously within 100 minutes, and the rate of dropping in the first half of the time is 1.2 times that of the second half of the time. 10 parts of NaOH pellets were added at tim...

Embodiment 2

[0022] In terms of parts by mass, add 55 parts of NaOH and 5 parts of catalyst cetyltrimethylammonium bromide to 100 parts of rice starch, pour 1250 parts of isopropanol solution and 45 parts of distilled water, and the stirring speed is 250r / min Fully stir and heat in a water bath at 50°C for 30 minutes to fully alkalinize the starch, then heat up to 60°C, and then add a total of 120 parts of isopropanol mixed with 70 parts of chloroacetic acid as follows, firstly Add 30 parts of the mixed solution at one time, immediately adjust the stirrer to 400r / min and stir for 10min, adjust the stirrer speed to 300r / min, continue the reaction for 15min, add 10 parts of NaOH particles to maintain an alkaline reaction environment, and then continue the reaction for 10min Finally, add the remaining mixed solution continuously within 90 minutes, and the rate of dropping in the first half of the time is 1.1 times that of the second half of the time. 10 and 5 parts of NaOH pellets were added ...

Embodiment 3

[0024] In terms of parts by mass, add 60 parts of NaOH and 7 parts of catalyst cetyltrimethylammonium bromide to 100 parts of rice starch, pour 1200 parts of isopropanol solution and 55 parts of distilled water, and the stirring speed is 250r / min Fully stir and heat in a water bath at 50°C for 35 minutes to fully alkalinize the starch, then heat up to 60°C, then add a total of 160 parts of isopropanol mixed with 85 parts of chloroacetic acid as follows, first Add 40 parts of the mixture at one time, immediately adjust the stirrer to 450r / min and stir for 10min, adjust the stirrer speed to 350r / min, continue the reaction for 10min, add 10 parts of NaOH particles to maintain an alkaline reaction environment, and then continue the reaction for 10min Finally, the remaining mixed solution was continuously added dropwise within 110 minutes, and the rate of dropping in the first half of the time was 1.1 times that of the second half of the time. 10 parts of NaOH pellets were added at...

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Abstract

The invention discloses a method for preparing carboxymethyl rice starch by virtue of a continuous supplementing method. The method comprises the following steps: adding NaOH and a catalyst to alkalify starch by taking rice starch as a raw material and an isopropanol solution as a reaction medium, continuously dropwise adding a mixed isopropanol solution doped with a certain amount of chloroacetic acid with certain time, keeping the alkaline environment of a system in an etherification process, regulating the stirring speed depending on the circumstances, and controlling reaction temperature and time; after reaction is finished, cooling, regulating the pH value, carrying out suction filtration, washing, drying to constant weight, and screening. The method disclosed by the invention substitutes the measures of dropping the chloroacetic acid dissolved in isopropanol in a continuous supplementing way in the etherification process of the rich starch and regulating the stirring speed and keeping the alkaline environment of the reaction system in a reaction process for the measure of adding the reactant chloroacetic acid for one time, thereby improving the stability of the reaction system, ensuring that the normal progress of the reaction and effectively solving the problem of conglomeration caused due to excessively fast viscosity increase in the reaction process; the prepared carboxymethyl starch can achieve the maximal DS (Degree of Substitution) of 0.76.

Description

technical field [0001] The invention relates to a preparation method of carboxymethyl rice starch. technical background [0002] Rice is one of the most important grain varieties in my country, and starch is the main component of rice, with a content of more than 90%. Although the three major raw materials of the starch industry are corn, wheat and potato, rice starch accounts for only 13%. Broken rice is an inevitable by-product produced in the rice processing process, which has been used as feed for a long time, and its comprehensive utilization rate is low. The main ingredients of broken rice and rice are basically the same, but the price is much cheaper than rice, and starch is its main ingredient. Rice starch has a good market prospect because of its unique properties and uses. Starch and its derivatives are commonly used in food and non-food processing. However, natural starch granules contain complex regions such as crystalline and amorphous, and the molecular str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B31/12
Inventor 刘忠义杨菊彭丽包浩陈婷乔丽娟李春玉
Owner 广西利佰兴食品集团有限公司
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