Method and device for increasing nitric acid utilization rate in production of metronidazole, and application

A utilization rate and nitric acid technology, which is applied in the fields of resource recovery and chemical synthesis, can solve the problems of nitrogen oxide pollution, low utilization rate of nitric acid, and high cost of absorption equipment, so as to improve utilization rate, accelerate gas-liquid exchange speed, and absorption speed Enhanced effect

Pending Publication Date: 2019-02-22
HUANGGANG NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current process has problems such as nitrogen oxides polluting the environm

Method used

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  • Method and device for increasing nitric acid utilization rate in production of metronidazole, and application

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Embodiment 1

[0060] figure 1 The structure of the device provided by the present invention is shown. A device for improving the utilization rate of nitric acid in production, comprising a reaction kettle 2 , a draft pipe 4 , a gas distributor 5 and a dropping funnel 10 .

[0061] The reaction kettle 2 has a loam cake 11 with a hole, a discharge valve 6 is arranged at the lower end, and an agitator 8 is arranged in the kettle. Preferably, the reactor 2 has a double-layer structure, the inner layer is used for material reaction, and the outer layer is used for condensation or heating of the introduced medium. The upper end of the outer layer of the reaction kettle 2 is provided with an inlet valve 1, and the lower end is provided with an outlet valve 7.

[0062] The guide tube 4 is a cylindrical body with upper and lower openings, and a guide hole is opened on the side wall; the guide tube 4 penetrates the upper cover 11 and is arranged in the reaction kettle 2 . The dropping funnel 10 is...

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Abstract

The invention discloses a device for increasing the nitric acid utilization rate in production. The device comprises a reaction kettle, a flow guiding tube, a gas distributor and a dripping funnel; the reaction kettle is provided with an upper cover, the upper cover is provided with a hole, and a discharging valve is arranged at the lower end of the upper cover; the flow guiding tube penetrates into the upper cover to be arranged in the reaction kettle; the dripping funnel is inserted into the flow guiding tube; and the gas distributor is arranged at the bottom of the reaction kettle. The device has the beneficial effects that 1, nitrogen oxide generated by the device is directly converted into nitric acid in a reaction system, and thus the utilization rate of nitric acid raw materials isincreased; 2, absorption liquid is replaced with an oxygen-containing reaction solution, polluted wastewater is not generated, an absorbent does not need to be purchased additionally, and only air needs to be utilized to increase oxygen is increased in reaction liquid through air; and 3, the nitrogen oxide generated in the reaction liquid is not mixed with inert gas, and thus the problem that theinert gas mixed with the nitrogen oxide is exhausted into air, and consequently the air is polluted is avoided, and the problem that the nitrogen oxide is diluted by the inert gas, the absorption rateis greatly decreased, and consequently the cost of absorption equipment is high is also avoided.

Description

technical field [0001] The invention belongs to the fields of chemical synthesis and resource recovery, and specifically relates to a method, device and application for improving the utilization rate of nitric acid in the production of metronidazole and glyoxylic acid. Background technique [0002] Metronidazole is white or yellowish crystal or crystalline powder, used for the treatment of intestinal and parenteral amoebiasis (such as amebic liver abscess, pleural amoebiasis, etc.). It can also be used to treat vaginal trichomoniasis, cylindrosis, skin leishmaniasis, and guinea worm infection. At present, it is also widely used in the treatment of anaerobic infection, and is regarded as the drug of choice for anti-anaerobic bacteria by the World Health Organization (WHO). [0003] Glyoxylic acid is composed of an aldehyde group (-CHO) and a carboxyl group (-COOH). Its structural formula is HOCCOOH, and its molecular formula is C 2 h 2 o 3 . Flavoring and fixing agents f...

Claims

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Application Information

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IPC IPC(8): B01J19/18C07D233/92
CPCB01J19/0053B01J19/18C07D233/92
Inventor 曾舟华叶发兵田正芳冉敬文黄林勇杨水彬
Owner HUANGGANG NORMAL UNIV
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