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Treatment device and method for 2,3-dichloropyridine production wastewater

A technology for the production of wastewater and treatment devices, which is applied in water/sewage treatment, natural water treatment, water treatment parameter control, etc. It can solve the problems of unfavorable amplification treatment, complicated treatment methods, and high pressure on environmental protection of the three wastes, and achieve simplified wastewater treatment process , The treatment process is simple and efficient, and the effect of reducing the cost of wastewater treatment

Inactive Publication Date: 2020-09-22
ANHUI COSTAR BIOCHEM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] There are two main production methods for 2,3-dichloropyridine: one is to react nicotinamide with sodium hypochlorite, distill and extract to obtain 3-aminopyridine, and react 3-aminopyridine with hydrogen peroxide to prepare 2-chloro-3- Aminopyridine, and then carry out diazotization and Sandmeyer reaction simultaneously to obtain 2,3-dichloropyridine, such as patent CN201310514134.0, the reaction process, the raw materials are easy to get, the price is cheap, but there are many reaction steps, and the environmental protection pressure of three wastes bigger
The second is to use polychloropyridine as raw material, prepare by catalytic reduction, and obtain 2,3-dichloropyridine through steam distillation and cooling crystallization, such as patent CN201610861806.9, this reaction has few steps and high yield, but post-processing will produce A large amount of wastewater containing pyridine and chlorinated pyridines, substances containing pyridine ring compounds are stable, difficult to oxidize, and are toxic or inhibitory to biochemical bacteria, and cannot be directly biochemically treated. Therefore, the treatment method of wastewater containing chlorinated pyridines will directly restrict chlorination. Production of pyridine
Patent CN201810388846.5 introduces a treatment method for chlorinated pyridine wastewater. After the wastewater is treated with pH adjustment, chlorine chlorination, Fenton oxidation, pH adjustment, and flocculation filtration, the COD removal rate reaches 83%, and the BOD 5 The / COD value is 0.45, and the treated wastewater reaches the biochemical treatment index. However, the treatment method is complicated, and various oxidants and additives such as chlorine gas and hydrogen peroxide are used, which is not conducive to industrial scale-up treatment. Therefore, enterprises generally adopt the traditional treatment method of incineration. Chlorine-containing pyridine wastewater is incinerated in a chlorine-containing thermal oxidation furnace, and the treatment cost is about 1,500 yuan / ton, which directly increases the three-waste waste treatment cost and production cost of chlorpyridine

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  • Treatment device and method for 2,3-dichloropyridine production wastewater

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Experimental program
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Effect test

Embodiment 1

[0025] Such as figure 1 , a treatment device for wastewater produced by 2,3-dichloropyridine, comprising a wastewater storage tank 1, a mixer 3, a hydrogen peroxide storage tank 4, an ultrasonic catalytic reactor 6, a heat exchanger 7, a photocatalytic reaction tower 8, and a wastewater storage tank The liquid outlet pipe of tank 1 is connected to the liquid inlet end of metering pump 2, and the liquid outlet pipe of metering pump 2 is connected to the liquid inlet end of mixer 3, and the waste water in waste water storage tank 1 is pumped into mixer 3 by metering pump 2, and the mixer One of the liquid inlets of 3 is connected to the liquid outlet pipe of hydrogen peroxide storage tank 4, and a flowmeter 5 is installed on the liquid outlet pipe of hydrogen peroxide storage tank 4, and hydrogen peroxide storage tank 4 supplies hydrogen peroxide to mixer 3, and flowmeter 5 is used to measure the hydrogen peroxide The flow rate, the mixer 3 is connected to the ultrasonic catalyt...

Embodiment 2

[0031] 2,3-dichloropyridine production waste water treatment device specific implementation steps are as follows: 2,3-dichloropyridine distillation suction filtration waste water (COD5541ppm) in 4m 3 / h flow rate pumped into the mixer 3, 27% hydrogen peroxide at 0.5m 3 / h flow rate into the mixer 3, mixed with hydrogen peroxide to obtain a mixed solution, the mixed solution is injected into the ultrasonic catalytic reactor 6, the reaction temperature is 10°C, and the residence time of the mixed solution in the ultrasonic catalytic reactor 6 is 3h; The heat exchanger 7 is preheated to 35°C and enters the photocatalytic reaction tower 8. The mixed solution passes through the packing layer 13 for photocatalytic oxidation reaction, and the residence time in the photocatalytic reaction tower 8 is 20h; COD online monitor 9, COD is 323ppm, effluent directly enters and exits water storage tank 11, COD removal rate is 94.1%.

Embodiment 3

[0033] 2,3-dichloropyridine production waste water treatment device specific implementation steps are as follows: 2,3-dichloropyridine distillation suction filtration waste water (COD5541ppm) in 4m 3 / h flow rate pumped into the mixer 3, 27% hydrogen peroxide at 0.4m 3 / h flow rate into the mixer 3, mixed with hydrogen peroxide to obtain a mixed solution, the mixed solution is injected into the ultrasonic catalytic reactor 6, the reaction temperature is 10°C, and the residence time of the mixed solution in the ultrasonic catalytic reactor 6 is 3h; 6. The effluent is preheated to 35°C by the heat exchanger 7, and enters the photocatalytic reaction tower 8. The mixed solution passes through the packing layer 13 for photocatalytic oxidation reaction, and the residence time in the photocatalytic reaction tower 8 is 20h; the photocatalytic reaction tower 8. The effluent passes through the COD online monitor 9, and the COD is 351ppm. The effluent directly enters the water storage ta...

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Abstract

The invention discloses a treatment device and method for 2,3-dichloropyridine production wastewater. The device comprises a wastewater storage tank, a mixer, a hydrogen peroxide storage tank, an ultrasonic catalytic reactor, a heat exchanger and a photocatalytic reaction tower, a liquid outlet pipe of the wastewater storage tank is connected with a liquid inlet end of a metering pump; one liquidinlet end of the mixer is connected with a liquid outlet pipe of the hydrogen peroxide storage tank; a water inlet spray head is mounted in the ultrasonic catalytic reactor; a liquid outlet pipe of the ultrasonic catalytic reactor is connected with a liquid inlet end of the heat exchanger, a liquid outlet pipe of the heat exchanger is connected with the photocatalytic reaction tower, a liquid outlet end of the photocatalytic reaction tower is connected with a liquid inlet end of a COD online monitor, the COD online monitor is provided with two liquid outlet pipes, one liquid outlet pipe is connected with an effluent storage tank, and the other liquid outlet pipe is connected with the mixer. The device and method provided by the invention can effectively degrade pyridine-containing cyclic compounds such as chloropyridine, reduce the COD of wastewater, and make the effluent index reach the discharge standard.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment device and method for wastewater produced by 2,3-dichloropyridine. Background technique [0002] 2,3-Dichloropyridine is an important fine chemical intermediate, widely used in chemical fields such as pesticides and pharmaceuticals, and is one of the most important raw materials for the synthesis of chlorantraniliprole insecticide and HGW86 (cyantraniliprole). With the gradual promotion of chlorantraniliprole, the demand for 2,3-dichloropyridine will increase significantly. [0003] There are two main production methods for 2,3-dichloropyridine: one is to react nicotinamide with sodium hypochlorite, distill and extract to obtain 3-aminopyridine, and react 3-aminopyridine with hydrogen peroxide to prepare 2-chloro-3- Aminopyridine, and then carry out diazotization and Sandmeyer reaction simultaneously to obtain 2,3-dichloropyridine, such as patent CN20131...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F101/38C02F103/36
CPCC02F9/00C02F2103/36C02F2101/38C02F1/32C02F1/36C02F1/725C02F2209/08
Inventor 周爱民温兰兰赵德张徐道明王丹刘彬
Owner ANHUI COSTAR BIOCHEM CO LTD