A system for treating glycine crystallization mother liquor by four-effect evaporative distillation process

Abstract

The invention discloses a system for treating a glycine crystallization mother liquor through a four-effect evaporation rectification process. The system comprises a first-effect rectification tower, a first-effect reboiler, a second-effect rectification tower, a second-effect reboiler, a third-effect rectification tower, a third-effect reboiler, a fourth-effect evaporator, a first-effect tower kettle material outlet pump, a second-effect tower kettle material outlet pump and a third-effect tower kettle material outlet pump, and is provided with a corresponding cooling system, a corresponding reflux system, a corresponding negative pressure system and a corresponding salt outlet system. According to the present invention, with the system, the high-purity methanol and the high-purity ammonium chloride can be simultaneously obtained, the process is simple, and the energy consumption is low; and with the application of the system to treat the glycine crystallization mother liquor, the consumed steam is 70-80% of the consumed steam of the traditional process, such that the operation cost is substantially saved, and the method is suitable for large-scale production.

Description

technical field [0001] The invention relates to a system for treating glycine crystallization mother liquor by a four-effect evaporation and rectification process. Specifically, the glycine crystallization mother liquor is separated by a multi-effect evaporation and rectification process to obtain high-purity methanol and ammonium chloride. Background technique [0002] The traditional glycine production process uses methanol to extract glycine, the mother liquor contains a large amount of methanol, ammonium chloride and water, methanol is extracted by distillation and reused, and the remaining ammonium chloride aqueous solution is usually concentrated and crystallized by multi-effect evaporation. However, although the traditional treatment process adopts a multi-effect evaporation and concentration process to save energy and reduce consumption, a large amount of steam is also consumed in the process of methanol distillation and extraction, resulting in an increase in the ove...

AI Technical Summary

Problems solved by technology

However, although the traditional treatment process adopts a multi-effect evaporation and concentration process to save energy and reduce consumption, a large amount of steam is also consumed in the process of methanol distillation and extraction, resulting in an increase in the overall treatment energy consumption of glycine mother liquor

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