Dry method for preparing oxidized starch by microwave

Abstract

The invention relates to a dry method for preparing oxidized starch by microwave. In the preparation method, starch and an oxidant are used as raw materials; and the oxidation reaction of the starch is initiated and catalyzed by using special thermal effect and non-thermal effect of the microwave in a microwave filed to prepare the oxidized starch. The preparation method comprises the following steps of: pouring the starch into a mixer, starting the mixer, spraying 1 to 30 percent oxidant in an amount which is 1 to 20 percent of the mass of the starch and uniformly mixing the starch and the oxidant; and putting the mixture into a microwave reactor, and initiating and catalyzing reaction by microwave radiation to obtain a finished product of the oxidized starch. Compared with the prior art, the dry method for preparing the oxidized starch by the microwave has the characteristics of simple and safe operation, low reaction temperature, short time, high efficiency, low energy consumption, environmental protection, no pollution, uniform starch oxidation, no need of drying, large-scale continuous production and the like, and is a simple, high-efficiency, energy-saving and environmental-friendly method for preparing the oxidized starch.

Description

technical field [0001] The invention relates to a method for preparing oxidized starch by microwave dry method. Background technique [0002] Oxidized starch has low viscosity, high solid dispersion, and minimal gelation. Due to the introduction of carbonyl and carboxyl groups by oxidized starch, the retrogradation tendency of amylose is minimized, thereby maintaining the stability of viscosity. Oxidized starch lowers the gelatinization temperature of starch, reduces the viscosity of hot paste and increases thermal stability, the product is white in color, transparent in paste, good in film-forming property, and good in freeze-thaw resistance. It is a thickener with low viscosity and high concentration and is widely used. In textile, paper, food, medicine and fine chemical industry. [0003] Sodium hypochlorite is used as an oxidant in most industrial productions to produce oxidized starch by wet process, which takes a long time to produce, pollutes the environment, requir...

AI Technical Summary

Problems solved by technology

[0003] In most industrial production, sodium hypochlorite is used as an oxidant to produce oxidized starch by wet process. This method takes a long time to produce, pollutes the environment, requires drying and post-processing, and consumes a lot of energy.

"A production method of oxidized starch" (application number 200710027471.1, publication number CN101284879A) invented by Li Xiangdong of Dongguan Dongmei Food Co., Ltd. is a dry method for producing oxidized starch, although it solves the pollution and drying problems of the wet process , but the reaction temperature is high (100-120°C), the time is long (0.5-1 hour), and the energy consumption is high