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Nitration reaction tail gas converting and recycling device and process

A nitrification reaction and recovery device technology, applied in chemical instruments and methods, dispersed particle separation, separation methods, etc., can solve problems such as incomplete absorption, tail gas emission not meeting environmental protection requirements, etc., and achieve huge economic benefits

Inactive Publication Date: 2019-05-31
河池市金兴生物科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a nitrification reaction tail gas conversion recovery device and its technology, to solve the problem of NO, NO in the tail gas conversion in the prior art 2 Incomplete absorption, leading to technical problems that exhaust emissions cannot meet environmental protection requirements

Method used

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  • Nitration reaction tail gas converting and recycling device and process
  • Nitration reaction tail gas converting and recycling device and process
  • Nitration reaction tail gas converting and recycling device and process

Examples

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Embodiment 1

[0027] Such as figure 1 Shown, a kind of nitrification tail gas conversion recovery process is characterized in that, the process steps are as follows:

[0028] S1: Use vacuum system to decompose NO, NO 2 、H 2 O and O 2 Draw out from the 2-methyl-5-nitroimidazole reaction kettle and enter the condenser; at 30°C, some NO 2 and evaporatively condensed H 2 O reaction is converted into dilute nitric acid, which is recycled to the dilute nitric acid collection tank, part of NO and O 2 NO 2 and unconverted NO, NO 2 Continue to enter the absorber, the absorber is equipped with corrosion-resistant packing, and the space of the packing has O 2 Fully contact with NO to generate NO 2 ; Then the nitric acid in the dilute nitric acid collection tank is pumped into the absorber with a circulation pump, and the NO in the absorber is removed by circulation. 2 into nitric acid;

[0029]S2: A small part of the tail gas that has not been completely converted is put into the tail gas co...

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Abstract

The invention discloses a nitration reaction tail gas converting and recycling device and process and belongs to the technical field of nitration reaction tail gas treatment. A combined process of lowtemperature, oxidization and multi-stage water absorption is adopted, and anti-corrosion packing formed by PVDF plastic polyhedral hollow sphere packing, ceramic Pall ring packing and 2507 duplex stainless steel metal cascade ring packing is placed in an absorber; aiming at the serious problem that NO and NO2 waste gas exhaust emissions generated in a 2-methyl-5-nitroimidazole synthesis process exceeds the standard, NO and NO2 waste gas can be converted into nitric acid available in production, a multi-stage condensation cooling and circulating spraying absorption mode is adopted, the conversion rate of NO and NO2 is greatly increased, and therefore the dual purposes of reducing pollutant discharge and increasing economic benefits are achieved.

Description

Technical field [0001] The invention relates to the technical field of nitrification reaction tail gas treatment, and in particular to a nitrification reaction tail gas conversion and recovery device and its process. Background technique [0002] The molecular formula of 2-methylimidazole is C 4 H 6 N 2 , is a white to off-white crystalline powder, hygroscopic, soluble in water, alcohol, acetone, and DMF. Insoluble in benzene; toxic, irritating and corrosive to skin and mucous membranes. It is used to produce pharmaceutical intermediates such as metronidazole and dimethonidazole; it can be used as a curing agent for epoxy resins and other auxiliaries for fiber fabric dyes; and as an additive in the preparation of foam plastics. [0003] During the nitration reaction between 2-methylimidazole and nitric acid, "yellow smoke" exhaust gas, namely NO, NO, is often produced during the process of synthesizing the API intermediate 2-methyl-5-nitroimidazole 2 gas. NO is a nitro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/18B01D53/00
Inventor 蔡敏韦明昌韦佑昂韦联安
Owner 河池市金兴生物科技有限公司
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