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[Preparation method] Modified starch or starch derivatives refers to the use of heat, acids, alkalis, oxidants, enzyme preparations and various types of A kind of functional group of organic reaction reagents chemically react with starch, or through physical changes, change the properties of natural starch, increase some of its properties or introduce new characteristics to prepare starch
Starch derivatives are generally classified according to modification treatment methods: a.
(1) Modification process
Generally speaking, in the process of chemical modification, only a very small amount of chemical groups are introduced into the starch molecule to greatly improve its performance
① Wet production process The wet production process of starch derivatives means that the modification reaction is carried out under liquid phase conditions.
Figure 4-21 The wet production process flow of starch derivatives
A certain concentration of starch slurry (generally 1.
② Dry production process The dry production process of starch derivatives means that the modification reaction is carried out under solid-phase conditions.
a.
The starch slurry (1.
b.
Figure 4-23 Dry process (using dry starch as raw material) production process of starch derivatives (b)
The raw material dry starch is uniformly mixed with the reaction reagents in a mixer.
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