Preparation Modified Starch by Using Concentrated Alkali
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Abstract:
Using corn starch as the raw material, sodium trimetaphosphate, sodium hypochlorite, acetic anhydride, propylene oxide, 3-chloro-2-hydroxypropyltrimethylammonium chloride as the modifiers, the modified starch was prepared in the aqueous phase with the mass fractions of the 3%, 6% and 10% sodium hydroxide solutions. The physicochemical properties of the modified starch were studied as well. According to the consumption of sodium hydroxide solution in the reaction process and the total volume of starch milk after the reaction, the utilization efficiency of the reaction tank and the change of water consumption were calculated. The results showed that the preparation of wet modified starch with 10% concentrated alkali can improve the utilization efficiency and production capacity of the reaction tank by 5%~22%, reduce industrial wastewater discharge by 8%~34%, and the use of concentrated alkali was particularly effective in preparing high-efficiency water-saving acetate starch and cationic starch. The process breaks through the bottleneck of preparing low-concentration alkali (mass fraction of 2%~4%) to prepare wet modified starch, which provides a theoretical basis for the production of wet modified starch with concentrated alkali in food and industry.
