Purification and recovery system for dichloromethane waste gas

Abstract

The invention discloses a purification and recovery system for dichloromethane waste gas. The system comprises a water spray tower, a defogging tower, a first shell-tube condenser, an induced draft fan, a white oil absorption system, a white oil desorption system, a dichloromethane recovery system, a chilled brine circulation system and a wastewater storage tank. The white oil absorption system comprises an absorption liquid circulation tank, an absorption tower, and an absorption liquid circulation pipeline, wherein the absorption liquid circulation pipeline is provided with an absorption liquid circulation pump and a first spiral plate type condenser. The white oil desorption system includes a steam pipeline, a desorption liquid circulation tank, a desorption tower, and a desorbing liquid recycling pipeline, and the desorbing liquid recycling pipeline is provided with a desorption liquid circulation pump and a second spiral plate type condenser. The dichloromethane recovery system also comprises a second shell-tube condenser, and a dichloromethane phase separator. The purification and recovery system provided by the invention can effectively remove the dichloromethane waste gas containing some dissolved organic matter, and realize the recovery of dichloromethane, thereby solving the problem that the purification of the dichloromethane waste gas is difficult at present.

Description

technical field

[0001] The invention relates to the field of purification treatment of organic waste gas, in particular to a purification and recovery system of methylene chloride waste gas. Background technique

[0002] Dichloromethane is widely used as an organic solvent in industry, mainly from film production, medicine and other fields. Due to the bioaccumulation and biotoxicity of dichloromethane, direct discharge has caused serious and long-lasting negative impacts on the human living environment. Therefore, in recent years, more and more attention has been paid to the treatment of methylene chloride waste gas.

[0003] At present, the main treatment technologies for dichloromethane waste gas include combustion method, adsorption method, and absorption method. Because dichloromethane contains halogen components, the combustion method will produce secondary pollution; the boiling point of dichloromethane is 39.75°C, and the adsorption method has disadvantages such as ...

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