Preparation of 2-aminoethylammonium chloride (ethylenediamine hydrochloride): (1) firstly, 2740g of n-butylamine and 1489g of chloropropyltrimethoxysilane were added to the reaction kettle according to the molar ratio of n-butylamine to chloropropyltrimethoxysilane of 5:1, and then the temperature was increased slowly to (85~90)C while stirring and reacted for 8h under the reaction temperature, to obtain the reaction solution containing N-[3-(trimethoxysilyl)propyl n-butylamine], n-butylamine hydrochloride and an excess of n-butylamine in the reaction solution, and when the reaction was finished, 1923 g of n-butylamine in the reaction solution was distilled under micro-negative pressure; (2) then the temperature in the reaction kettle was controlled at 70 , and then 540 g of ethylenediamine was added to the reaction kettle according to the feeding ratio of ethylenediamine and n-butylamine hydrochloride generated in step (1) with a molar ratio of 1.2:1, and then it was stirred for 1 h, so that Ethylenediamine and n-butylamine hydrochloride to carry out a sufficient displacement reaction to generate ethylenediamine hydrochloride, and when the stirring was finished, the liquid was separated after holding and standing at a temperature of 65C for 6h, and 1,943g of the upper reaction solution containing N-[3-(trimethoxysilyl)propyl]n-butylamine, n-butylamine and ethylenediamine was obtained, as well as 865g of the lower reaction solution containing ethylenediamine hydrochloride.
