Method and device for treating nitrochlorobenzene waste gas

Abstract

The invention discloses a method and a device for treating nitrochlorobenzene waste gas. The method is characterized by comprising the following steps of: removing dust particles in discharged drying waste gas by virtue of a dust remover, then removing water vapour carried by the waste gas by condensation, heating the waste gas by virtue of a heater, and using the waste gas as a hot wind source of a drying system; the device comprises a gas gathering system, a cooling system, a spraying purification system, a solid-liquid separation system and a draught system, wherein the systems are sequentially connected by virtue of pipelines; the gas gathering system is composed of multiple draught hoods connected in parallel, the cooling system adopts a fin-type water-cooling heat exchange way, the spraying and purifying system comprises a spraying tower, and the solid-liquid separation system comprises a solid-liquid separation water tank. In the invention, multiple cooling heat exchange methods are combined, nitrochlorobenzene waste gas is effectively treated, the removal rate is higher, and no secondary pollution is produced.

Description

[0001] technical field [0002] The invention relates to a waste gas treatment technology, in particular to a method and device for treating nitrochlorobenzene waste gas. Background technique [0003] Nitrochlorobenzene is an important chemical raw material, which is composed of three isomers: p-nitrochlorobenzene, o-nitrochlorobenzene and m-nitrochlorobenzene. The waste gas of nitrochlorobenzene contains p-, o- and m-nitro Chlorobenzene vapor and sublimates, water vapor and air. The melting point of pure p-nitrochlorobenzene is 83.5°C; the melting point of pure o-nitrochlorobenzene is 32.5°C; the melting point of pure m-nitrochlorobenzene is 46°C. The direct discharge of nitrochlorobenzene waste gas will cause great pollution to the atmospheric environment, cause damage to the health of operators, and affect the living environment of surrounding residents. [0004] At present, the purification methods commonly used for organic waste gas include combustion method, adsorpti...

AI Technical Summary

Problems solved by technology

Using the combustion method to treat nitrochlorobenzene waste gas, the nitrogen oxides and chlorine oxides produced will cause secondary pollution; nitrochlorobenzene is easy to solidify at room temperature, and the adsorption method will quickly cover the surface of the adsorbent. , so that it loses its adsorption capacity; the absorption method generally uses ethanol, ether, and benzene as absorbents. Such absorbents are volatile at room temperature and are easily taken away by gas to generate new pollution, so the pollution problem cannot be completely solved.

Images