Recovery of dichloromethane vapors and emission within specified limits

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Sources of OCs waste gas: Production units: reaction vessels, distillation/refining units, drying equipment, centrifugal filtration systems, storage tanks, wastewater tanks, etc. Traditional VOC treatment processes: condensation (light cooling, deep cooling), adsorption (activated carbon/carbon fiber/resin), absorption, biological methods (microbial degradation), photocatalytic oxidation, low-temperature plasma, RTO, etc. Disadvantages of traditional VOC treatment processes: deep cooling can lead to freezing; activated carbon generates solid waste; adsorption regeneration produces large amounts of wastewater; removal efficiency is low; high concentrations can cause saturation; halogen-containing exhaust gases corrode RTO units and can produce dioxins, posing a threat to the environment. The fundamental reason why traditional processes cannot meet the requirements is poor process compatibility, along with a lack of transition treatment processes from high concentrations to low concentrations. The three-stage overlapping VOCs waste gas treatment process combines compression condensation, membrane technology, and adsorption; in the range of medium-concentration VOCs, it uses membrane units to facilitate the transition from high-concentration areas to low-concentration areas, thereby ensuring that the VOCs emissions meet regulatory standards. Waste gas flow rate of dichloromethane: 50–10,000 m3/h; concentration >5%. Waste gas parameters: Inlet concentration range (ppm), outlet concentration of the compression condensation membrane unit (ppm), outlet concentration of the adsorption unit (mg/m3). For dichloromethane (DCM): Inlet concentration >50,000 ppm; outlet concentration 800–5,000 ppm, with a concentration of <20 mg/m3 at the outlet. Engineering examples: In the pharmaceutical industry, there is a dichloromethane waste gas treatment system with a flow rate of 200 Nm3/h; the inlet concentration is 24%, while the outlet concentration is <20 mg/m3. In the chemical industry, there are recovery units for propylene oxide with a flow rate of 300 m3/h and for dichloropropane with a flow rate of 300 m3/h; the inlet concentration of propylene oxide is 58%, with an outlet concentration of <1 mg/m3, while the inlet concentration of dichloropropane is 8.7%, with an outlet concentration of <50 mg/m3. Please feel free to contact us by phone if you have any inquiries. Mr. Li 15850669279