Method for preparing starch octenyl succinate anhydride

Abstract

The invention discloses a method for preparing ocentyl succinic starch ester, which uses non-crystallization granule state starch as a basis and a microwave method as a core, and combines a part of processes of a drying method and a solvent method. The method comprises the following steps: (1) mixing a certain amount of pure water with 95 percent of ethanol; adding the starch at a stirring state, keeping stirring and keeping a reaction container to be obturated; (2) maintaining the temperature of a reaction system, keeping certain speed and stirring to react for several minutes; (3) removing the ethanol, crushing a filter cake, spraying a sodium hydroxide solution to the filter cake, evenly stirring, again spraying an octenyl succinic anhydride ethanol liquid to the filter cake, and evenly mixing; (4) evenly spreading a reaction mixture and placing the reaction mixture in a microwave oven to carry out esterification; and (5) washing with ethanol solution, filtering, drying, screening and packaging to prepare the ocentyl succinic starch ester. The invention has the advantages of high reaction efficiency, short reaction period and low reaction energy consumption.

Description

technical field [0001] The invention belongs to the technical field of modified starch, and in particular relates to a method for preparing starch octenyl succinate through partial processes of amorphous granular state pretreatment combined with microwave method, dry method and solvent method. Background technique [0002] With the rapid development of industry and science and technology, among many starch products, modified starch occupies a very important position and is the main way to broaden the application of starch. Modified starch refers to the use of physical, chemical or biological enzyme preparation methods to cut off molecules, rearrange or introduce functional groups into starch molecules to enhance certain qualities of the original starch or introduce some characteristics that the original starch does not have, so as to adapt to modern industry. Starch derivatives prepared for higher requirements on starch quality. As a green biological substrate, modified sta...

AI Technical Summary

Problems solved by technology

Although the dry method has a simple production process, low cost, high reaction efficiency, and less environmental pollution, the equipment requirements are relatively high, and there are difficulties in mixing starch and chemical reagents, uneven distribution of substituents, easy to cause local reactions, and difficult by-products. Remove other defects that affect product quality

The solvent method overcomes the shortcomings of low wet reaction efficiency, but it is costly and pollutes the environment, and because the product is produced in a medium such as acetone, it cannot be used in the food and cosmetic industries

[0005] In summary, several preparation methods mentioned above usually use starch directly as a raw material. Starch granules are composed of crystalline regions and non-crystalline regions. Due to the existence of crystalline regions, it is not conducive to the penetration of chemical reagents. On the one hand, it leads to chemical reactions in the crystalline regions. The efficiency and activity are reduced, and on the other hand, the degree of chemical reaction between the crystalline and non-crystalline regions inside the starch granules is uneven, which affects the quality of the modified starch as well as the application effect and shelf life