Cleaning treatment method of glycine production wastewater

A technology for clean treatment and production of wastewater, applied in multi-stage water treatment, natural water treatment, water treatment parameter control, etc., can solve yield and quality fluctuations, poor process stability, increased pressure of condensed water reuse, etc. problems, to achieve the effect of simple equipment, guarantee of green production, and easy operation

Active Publication Date: 2018-10-16
HUBEI TAISHENG CHEM
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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 rel

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  • Cleaning treatment method of glycine production wastewater
  • Cleaning treatment method of glycine production wastewater
  • Cleaning treatment method of glycine production wastewater

Examples

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Effect test

Embodiment 1

[0026] Use 31% hydrochloric acid to adjust glycine waste water to pH = 3.5 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 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 liqui...

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 cleaning treatment method of glycine production wastewater. The method comprises the following specific steps: firstly adjusting the pH of glycine wastewater to be within arange of 2 to 3.5 through hydrochloric acid, so as to inhibit the decomposition of ammonium chloride; then obtaining condensed water with high ammonia nitrogen and COD contents through an I-effect evaporation system and an II-effect evaporation system, and ensuring that the condensed water directly returns a glycine production system to be recycled, so as to reduce dosages of urotropine and methanol; performing concentration through a vacuum flash evaporation system, so as to obtain condensed water with medium ammonia nitrogen and COD contents; treating the condensed water through a special high-vacuum low-temperature evaporation system; performing low-temperature evaporation, so as to obtain condensed water with low ammonia nitrogen and COD contents, ensuring that the condensed water canmeet an II-grade discharge standard through further organic composite film treatment and biochemical treatment, and ensuring that residual liquid with high ammonia nitrogen and COD contents still returns the glycine system to be recycled. The method is small in equipment investment, realizes harmless mother liquor treatment, is energy-saving and environmentally friendly, ensures that the glycine wastewater can realize close circulation, and is suitable for being widely applied 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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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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