A kind of cleaning treatment method of glycine production wastewater

A technology for clean treatment and production of wastewater, applied in natural water treatment, multi-stage water treatment, water treatment parameter control, etc., can solve problems such as increasing system water volume, deteriorating process stability, yield and quality fluctuations, etc., and achieve reduction Ammonia nitrogen content, green production guarantee, simple equipment effect

Active Publication Date: 2021-06-08
HUBEI TAISHENG CHEM
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the reuse of evaporated condensed water will cause the process stability of glycine synthesis and extraction process to deteriorate, and the yield and quality of glycine will also fluctuate with the stability of ammonium chloride recovery process. It is necessary to take into account glycine yield, product quality, ammonium chloride The relationship between recycling processes and wastewater reuse methods, with little process flexibility
Secondly, once the product is unqualified in the glycine synthesis process, the consumption of a large amount of methanol aqueous solution for washing will increase the water volume of the system, which may increase the pressure of condensed water reuse

Method used

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  • A kind of cleaning treatment method of glycine production wastewater
  • A kind of cleaning treatment method of glycine production wastewater
  • A kind of cleaning treatment method of glycine production wastewater

Examples

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Comparison scheme
Effect test

Embodiment 1

[0026] Use 31% hydrochloric acid to adjust glycine waste water to pH = 3.5 at 100 m 3 The mother liquor is continuously poured into the first-effect evaporation system (vacuum degree -0.03Mpa, temperature 110°C) for concentration, and the first-effect evaporation condensate (A) is about 32.22 m 3 . The first-effect concentrated liquid is poured into the second-effect evaporation system (vacuum degree -0.07Mpa, temperature 85°C) for concentration, and the second-effect evaporation condensate (B) is about 25.06m 3 . The two-effect concentrated liquid is poured into the decompression flash system (vacuum degree -0.08Mpa) for concentration, and the flash condensate (C) is about 14.32m 3 . The final concentrate was crystallized and centrifuged to obtain 38.7 tons of ammonium chloride. will be 14.32m 3 The flash condensed water is poured into the low-temperature evaporation system (vacuum degree -0.09Mpa, temperature 70°C) to continue to concentrate, producing dilute waste liqu...

Embodiment 2

[0029] Use 31% hydrochloric acid to adjust glycine wastewater to pH=2 at 100m 3 The mother liquor is continuously poured into the first-effect evaporation system (vacuum degree -0.03Mpa, temperature 110°C) for concentration, and the first-effect evaporation condensate (A) is about 30.78 m 3 . The first-effect concentrated liquid is poured into the second-effect evaporation system (vacuum degree -0.07Mpa, temperature 85°C) for concentration, and the second-effect evaporation condensate (B) is about 24.76m 3 . The two-effect concentrated liquid is poured into the decompression flash system (vacuum degree -0.08Mpa) for concentration, and the flash condensate (C) is about 15.12m 3 . The final concentrate was crystallized and centrifuged to obtain 38.7 tons of ammonium chloride. will be 15.12m 3 The flash condensed water is poured into the low-temperature evaporation system (vacuum degree -0.09Mpa, temperature 60°C) to continue to concentrate, producing dilute waste liquid (D)...

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Abstract

The invention relates to a method for cleaning and treating waste water from glycine production. The specific steps are: first use hydrochloric acid to adjust the pH of glycine wastewater to the range of 2 to 3.5 to inhibit the decomposition of ammonium chloride; then through the I-effect evaporation and II-effect evaporation systems to obtain condensed water with high ammonia nitrogen and high COD content, the water can be directly Return to the glycine production system for reuse to reduce the consumption of urotropine and methanol; then condense through a decompression flash system to obtain condensed water with a medium content of ammonia nitrogen and COD; the water obtained from the flash system is treated by a special high-vacuum low-temperature evaporation system The condensed water with low ammonia nitrogen and COD content obtained by low-temperature evaporation can reach the secondary discharge standard after further organic composite membrane treatment and biochemical treatment, and the remaining raffinate with high ammonia nitrogen and COD is still returned to the glycine system for reuse. The method has low equipment investment, harmless mother liquor treatment, energy saving and environmental protection, and glycine wastewater can realize closed-circuit circulation, and is suitable for wide application in the glycine industry.

Description

technical field [0001] The invention belongs to the technical field of glycine production, and in particular relates to a cleaning treatment method for glycine production wastewater. Background technique [0002] At present, the domestic production of glycine still adopts the relatively traditional ammonolysis method of chloroacetic acid. The simple process is: using water as a solvent and urotropine as a catalyst, reacting chloroacetic acid and ammonia to produce a mixture of glycine and ammonium chloride. Then add a large amount of methanol for alcohol analysis, and separate the mother liquor containing complex components such as ammonium chloride, glycine, urotropine, water and methanol through a centrifuge to obtain a glycine solid. For the centrifuged mother liquor after separation of glycine, methanol is generally separated by a rectification tower, and then the residual liquid at the bottom of the rectification tower is concentrated by double-effect evaporation (tempe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/38C02F103/34C02F103/36
CPCC02F1/04C02F1/06C02F1/66C02F3/30C02F9/00C02F2101/38C02F2103/34C02F2103/36C02F2209/08C02F2209/14C02F2301/08
Inventor 彭春雪郝晓斌李跃军刘三六马万志姚红
Owner HUBEI TAISHENG CHEM
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