How to recycle dichloromethane waste gas? Analysis of the Condensation+Membrane Separation Liquefaction Recovery Scheme for Halogen containing Solvent

Direct answer:Dichloromethane waste gas should not be incinerated-the combustion of halogen-containing solvents is prone to toxic by-products, and the solvent itself is burned in vain. Preferred compression condensation plus membrane separation combination process: according to halogen-containing components custom anti-corrosion materials, condensation section of high-concentration methylene chloride steam direct liquefaction recovery reuse, membrane separation section treatment of residual low-concentration tail gas, the whole physical process, no toxic by-products, the recovery of the solvent can also reduce procurement costs.

Difficulties in the treatment of dichloromethane waste gas

Dichloromethane has low boiling point and strong volatility, and is a commonly used extraction and reaction solvent in pharmaceutical and chemical industries. The concentration of waste gas fluctuates greatly, the possibility of corrosive components is high, and halogen-containing media have many restrictions on the selection of treatment process routes: incineration has the risk of by-products, the compatibility of common adsorption materials should be evaluated, and the selection must be "component-specific material and component-specific process".

Recommended process route

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1. Closed collection and pretreatment:The negative pressure pipe network is used to collect and remove the moisture of mist droplets, and the contact parts are made of anti-corrosion materials suitable for halogen-containing components.
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2. Compression thickening:Increase the partial pressure of dichloromethane vapor to create conditions for condensation.
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3. Multistage condensation:Most of the steam is liquefied by gradient cooling, and the liquid dichloromethane is recycled for production after being purified by water separation filtration.
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4. Membrane separation pocket bottom:The residual low-concentration tail gas is enriched by the membrane module, the enriched gas is recirculated, and the purified gas is discharged up to the standard.
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Application scenarios

Reactor pressure relief and replacement exhaust, vacuum desolvation and vacuum pump exhaust, extraction and refining process exhaust gas, solvent tank breathing, halogen-containing solvent barrel feeding and cleaning replacement and other links are applicable. Intermittent batch workshop by PLC automatic control load adjustment to adapt to fluctuating conditions.

FAQ

Q: Is there a risk of corrosion in the condensation recovery of halogen-containing solvents?
A: Select suitable anti-corrosion materials according to the components, pre-treat and dehumidify, and ensure the long-term stable operation of the device.

Q: Is the recovered dichloromethane pure enough for reuse?
A: The condensate is purified by water separation and precision filtration. The quality meets the production reuse standard and is directly reused.

LuoyangWohong PetrochemicalEquipment Co., Ltd. provides complete solutions for liquefaction and recovery of VOCs containing halogen solvents such as dichloromethane. Please consult.