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Processing method of glycine production wastewater

A technology for the production of wastewater and treatment methods, which is applied in natural water treatment, multi-stage water treatment, heating water/sewage treatment, etc. It can solve the problems of complex condensate composition and unstable glycine production process, and achieve reduction of reaction, COD and The effect of reducing the content of ammonia nitrogen and reducing the treatment cost

Inactive Publication Date: 2020-04-10
天津乐科节能科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it can be seen from the evaporation conditions recorded that it still cannot avoid the decomposition reaction of ammonium chloride and urotropine and trace amino acid pollution caused by the high-temperature evaporation of the heavy components at the bottom of the rectification tower after rectification and separation of methanol The reaction between substances makes the condensate composition complex, and the glycine production process will be unstable after returning to the glycine production section

Method used

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  • Processing method of glycine production wastewater
  • Processing method of glycine production wastewater
  • Processing method of glycine production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In a small test, the waste water after alcohol analysis and centrifugal separation of glycine in the production process of glycine by chloroacetic acid method was taken, and the mass content of each component was analyzed as methanol 66%, water 24%, ammonium chloride 7%, urotropine 1.2%, glycine and other organic impurities 1.8%. The waste water is evaporated and concentrated by a rotary evaporator to recover ammonium chloride. The pressure of the evaporation system is controlled at -0.09MPa and the evaporation temperature is 55°C. After analysis, the purity of ammonium chloride was 93%. The condensate is separated from methanol and water by a rectification device, and the temperature of the bottom of the tower is controlled not to be higher than 100°C, and the temperature of the top of the tower is 65°C. The composition of the tower top condensate and tower still mother liquor is analyzed as follows (wherein the COD content is the content after deducting methanol):

...

Embodiment 2

[0027] In the pilot test, the waste water after alcohol analysis and centrifugal separation of glycine in the production process of glycine by chloroacetic acid method was taken, and the mass content of each component was analyzed as methanol 60%, water 30%, ammonium chloride 7%, urotropine 1.4%, glycine and other organic impurities 1.6%. The waste water is evaporated and concentrated by the MVR evaporation system to recover ammonium chloride. The pressure of the evaporation system is controlled at -0.06MPa, the evaporation temperature is 75°C, and the recovery rate of ammonium chloride is 78%. After analysis, the purity of ammonium chloride was 90%. The condensate is separated from methanol and water by a rectification device, and the temperature of the bottom of the tower is controlled not to be higher than 100°C, and the temperature of the top of the tower is 65°C. The composition of the tower top condensate and tower still mother liquor is analyzed as follows (wherein the...

Embodiment 3

[0031] In the pilot test, the waste water after alcohol analysis and centrifugal separation of glycine in the production process of glycine by chloroacetic acid method was taken, and the mass content of each component was analyzed as methanol 60%, water 30%, ammonium chloride 7%, urotropine 1.4%, glycine and other organic impurities 1.6%. The wastewater is evaporated and concentrated by the double-effect evaporation system to recover ammonium chloride. The first-effect evaporation temperature of the evaporation system is controlled to be 80°C, the second-effect evaporation temperature is 60°C, and the recovery rate of ammonium chloride is 75%. After analysis, the purity of ammonium chloride was 89%. The first-effect and second-effect condensates enter the rectification tower together, and the methanol and water are separated through the rectification device. The temperature of the tower bottom is controlled not to be higher than 100°C, and the temperature of the tower top is 6...

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Abstract

The invention discloses a processing method of glycine production wastewater, and the method comprises the following specific steps: carrying out negative-pressure low-temperature evaporation on wastewater obtained by centrifugally separating ammonium chloride after alcohol precipitation in the glycine production process to recover the ammonium chloride, carrying out rectification separation on condensate, and returning recovered methanol at the tower top to the glycine production alcohol precipitation section for reuse and water recovered at the tower kettle to the glycine production processfor dissolving chloroacetic acid and urotropin. According to the scheme, a traditional wastewater processing process is improved, methanol-water mixed wastewater is subjected to negative-pressure low-temperature evaporation firstly, and the ammonium chloride with high quality can be recovered. Meanwhile, due to existence of methanol and pressure control, the evaporation temperature is low, decomposition of the ammonium chloride is avoided, and the content of ammonia nitrogen in water obtained through rectification separation can be reduced. The operation temperature of the tower kettle can bereduced by separating the ammonium chloride and then rectifying to separate the methanol, the operation energy consumption is reduced, meanwhile, the corrosion to equipment is reduced, and the servicelife of a rectifying tower is prolonged. According to the scheme, red wastewater cannot be generated, and zero emission of the wastewater is realized.

Description

technical field [0001] The invention relates to the technical field of glycine production, in particular to a treatment method for glycine production wastewater. Background technique [0002] Glycine, also known as aminoacetic acid, is the simplest amino acid compound and an important chemical intermediate, widely used in the fields of medicine, pesticide, organic synthesis and biochemical synthesis. At present, more than 85% of domestic glycine is produced by chloroacetic acid ammoniation method. The process flow is attached figure 1 shown. The basic principles are as follows: [0003] ClCH 2 COOH+NH 3 +H 2 O+(CH 2 ) 6 N 4 →NH 2 CH 2 COOH+NH 4 Cl+HCHOHCHO+NH 3 →(CH 2 ) 6 N 4 +H 2 o [0004] The method has the advantages of simple process, easy control and high yield, but the disadvantage is that a large amount of waste water containing methanol, ammonium chloride, urotropine, glycine and organic by-product impurities will be produced at the same time. For...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04C02F101/16C02F101/34C02F103/36
CPCC02F1/04C02F2103/36C02F2101/34C02F2101/16C02F2301/08
Inventor 夏君君于会满全晓宇尹海蛟刘莉谢源圩
Owner 天津乐科节能科技有限公司
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