Green and environment-friendly synthesis method of N, N, N'-trimethylethylenediamine
A technology of trimethylethylenediamine and its synthesis method, which is applied in the preparation of amino-substituted functional groups, organic chemistry, etc., and can solve problems such as difficult handling and high salt
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Embodiment 1
[0039] A green and environment-friendly synthesis method of N,N,N'-trimethylethylenediamine, the specific preparation process flow chart is as follows figure 1 shown, including the following steps:
[0040] S1, Preparation of N,N,N'-trimethylethylenediamine hydrochloride
[0041] Add 311.5 g of a 40% dimethylamine aqueous solution in a closed three-necked flask with a mechanical stirrer and a thermometer, and add 600 g of 50% 2-chloro-N- The solution of methylethylamine hydrochloride was reacted, and the reaction solution was obtained after 2 hours of reaction;
[0042] S2, post-processing
[0043] The three-necked flask in S1 is connected in series with the dimethylamine absorption device with an air guide tube, and 3500 g of mass concentration is 25% hydrochloric acid solution is housed in the dimethylamine absorption device, and 576.9 g of 64% hydrochloric acid solution is added dropwise to the three-necked flask under stirring conditions. Sodium hydroxide aqueous soluti...
Embodiment 3
[0055] A green and environment-friendly synthetic method of N,N,N'-trimethylethylenediamine, comprising the steps of:
[0056] S1, Preparation of N,N,N'-trimethylethylenediamine hydrochloride
[0057] Add 1617.2 g of a 40% methylamine aqueous solution with a mass concentration of 40% in a closed three-necked flask with a mechanical stirrer and a thermometer, and add 750 g of 40% N, N-dimethylamine dropwise at 40° C. Aminochloroethane hydrochloride aqueous solution was reacted, and after the dropwise addition was completed, it was reacted for 6 hours to obtain a reaction solution;
[0058] S2, post-processing
[0059] Connect the methylamine absorption device on the three-necked flask with an air guide tube. The methylamine absorption device is equipped with 4000g of mass concentration and is 20% hydrochloric acid solution. Under stirring conditions, add 238.0g of mass concentration to the three-necked flask dropwise. 70% sodium hydroxide aqueous solution , and the temperatur...
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