The invention discloses a high efficiency production method of
glycine. The high efficiency production method comprises following steps:
solvent methanol or
ethanol, and catalyst urotropine or
paraformaldehyde are introduced into a reactor,
Ammonium-monochloracetat is added, the temperature is increased to 60 to 70 DEG C, N,N-Diisopropylethylamine or N,N-Diethylbenzylamine or N, N-di-n-propyl
benzylamine or N, N-di-n-butyl
benzylamine are added dropwise in 2h,
thermal insulation reaction is carried out at 65 to 75 DEG C for 2.5h, the temperature is reduced to 40 to 50 DEG C for
precipitation of
glycine crystal, or the temperature is reduced to 10 to 25 DEG C for
precipitation of a mixture of
glycine crystal and an
ammonium salt; and then filtering, washing, and
drying are carried out successively so as to obtain a
glycine product, wherein a washing liquid is adopted for recycling of N,N-Diisopropylethylamine or N,N-Diethylbenzylamine or N, N-di-n-propyl
benzylamine or N, N-di-n-butyl benzylamine. The glycine yield is increased by 10% of that in the prior art;
energy consumption is reduced; catalyst recycling is realized; recycling of N,N-Diisopropylethylamine or N,N-Diethylbenzylamine or N, N-di-n-propyl benzylamine or N, N-di-n-butyl benzylamine is realized; and combined production of
ammonium chloride is realized.