Method 1: A preparation process for acetylated distarch adipate, including the following steps: inject process water into a feeding tank, add raw starch, adjust the starch milk concentration to 18 Baume degrees, and beat the adjusted starch slurry to Reaction tank; adjust the pH value to 7.8 with dilute alkali solution, add adipic acid not exceeding 0.12% of starch dry basis mass fraction and acetic anhydride not exceeding 8% of starch dry basis mass fraction for reaction, the acetic anhydride addition rate is 200L/ h, after adding acetic anhydride, add acid to stop the reaction for 4.5, then remove impurities, and then wash in a disc centrifuge. After washing, the conductivity of the starch milk is ≤ 3000 μs/cm, then dehydrate with a scraper, and then in an air flow dryer Drying, the drying tail wind temperature is 55℃, the moisture of the dried product is <18%, and then screened to a fineness of ≥99.0%, and then the finished product is packaged, with a net content of 25kg, and then put into storage.
Method 2: A method for preparing acetylated distarch adipate starch, including the following steps:
Step 1: Put 1000 units of tapioca starch into a reaction tank, add water and stir to prepare a starch milk with a concentration greater than 30%. Too much reaction medium will dilute the reagent, which will reduce the reaction rate of Kao plasticizer. If the reaction medium is too little, the starch The milk cannot be stirred and easily precipitates, and the reaction is uneven after the reagent is added;
Step 2: When the tapioca starch is mixed with water, 50 to 80 units of sodium chloride can be added, which is mainly used to increase the gelatinization temperature of starch and also inhibit the expansion of starch granules;
Step 2: Stir the starch milk. During the stirring process, continuously add alkali solution with a concentration of 1~3 mol/L. Alkaline conditions are conducive to the swelling of starch granules and accelerate the penetration of reagents;
Step 3: Measure the pH value of the starch milk during the stirring process. When the pH value reaches 10.0~13.0, stop adding alkali solution. An appropriate amount of alkali solution can achieve the purpose of increasing the reaction rate of the etherification reaction;
Step 4: Evacuate the reaction tank, continue stirring and quickly add 2 to 4 unit mass of adipic anhydride and 20 to 30 unit mass of acetic anhydride to the starch milk, heat and react for 1 hour, and make adipic anhydride by heating and vacuum conditions. It is difficult to convert dianhydride into adipic acid, and even the part that has been converted into adipic acid is reacted into adipic anhydride, thus ensuring the efficient progress of the cross-linking reaction; in addition, acetic anhydride is an important reagent for acetylation;
Step 5: Continue stirring and adjust the pH value with hydrochloric acid with a mass percentage concentration of 3%. Stop adding hydrochloric acid when the pH value reaches 5 to 7. Its function is to neutralize the excess alkali solution, making the product a pH neutral for consumption. sexual material;
Step 6: Wash with a large amount of water, dehydrate and dry to obtain the finished product. This is a conventional method for starch production.
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