Process for preparing quaternary ammonium cation starch by semi-dry method

Abstract

The semi-dry quaternary ammonium cation starch preparing process includes material compounding, catalyst solutino compounding and heating, and features the molar ratio between the catalyst and 3-chloro-2-hydroxypropyl trimethyl ammonium chloride reagent 1.4-2.8, the molar ratio between the reagent and starch 0.05-0.15, the atomized spray of the catalyst solution to the reactor, heating with circular hot water during reaction and reaction temperature controlled in 50-90 deg.C. The said cation starch preparing process has the advantages of both wet process and dry process, including no materialring break, no starch caking, no need of post-treatment, no "three waste" exhaust, simple process, short reaction period, mild reaction condition, high conversion rate, etc.

Description

technical field [0001] The invention relates to the preparation of modified starch, in particular to the preparation of quaternary ammonium cationic starch by a semi-dry method. Background technique [0002] The preparation process of quaternary ammonium cationic starch has three kinds: wet method (water solvent method), organic solvent method and dry method. The wet preparation process is a traditional process, which is widely used by many cationic starch manufacturers. Its general preparation method is: in the presence of NaOH, add Na 2 SO 4 Or NaCl to prevent starch swelling, the molar ratio of NaOH and 3-chloro-2-hydroxypropyltrimethylammonium chloride reagent is 2.8:1, 3-chloro-2-hydroxypropyltrimethylammonium chloride reagent and The molar ratio of starch is 0.05:1, and the 35% starch suspension is reacted at about 50° C. for 4 hours. The advantage of this process is that the reaction conditions are mild and the production equipment is simple; its disadvantages are...

AI Technical Summary

Problems solved by technology

The advantages of this process include no post-treatment, no three wastes, simple process, and short reaction cycle; its disadvantages are low reaction conversion rate, high requirements for reaction equipment, and unstable product quality.