Compression, condensation and membrane separation to recover the solvent in the exhaust gas

The organic solvents in VOCs exhaust gases are raw materials that have been misplaced. The combined process of compression, condensation, and membrane separation is used to separate these solvents from the waste gas, converting them into reusable liquid resources. The process takes pure physical separation as the core, does not involve combustion, does not rely on adsorption materials, and does not produce new pollutants.

After the exhaust gas enters the system, it is first pressurized by the compressor to increase the partial pressure of organic matter and create favorable conditions for subsequent condensation. The pressurized gas enters the multi-stage condensation unit, and the temperature is gradually reduced from normal temperature to minus fifteen to minus twenty-five degrees Celsius through graded cooling. As the temperature drops, most of the organic matter in the waste gas directly changes from gaseous to liquid, which can be reused for production after separation by the collection tank, and the purity of the recovered solvent can reach more than 90%.

The condensed tail gas still carries a small amount of organic matter that is not liquefied and enters the membrane separation unit.gas separation membraneThe permeation rate of organic molecules is significantly higher than that of air, and VOCs preferentially permeate the membrane layer to form concentrated gas, which is sent back to the compressor inlet and then enters the condensation process for recycling treatment. The trapped purified gas meets the discharge standard. With this cycle design, the system forms a closed recovery loop.

The whole process is driven by electricity and does not consume natural gas.activated charcoalWait for consumables to be replaced; no hazardous waste is generated. The recovered solvent can be directly reused, reducing raw material procurement costs. Purely physical separation, with no open flames, suitable for hazardous areas such as chemical plants, pharmaceutical facilities, and tank farms. The overall recovery rate can exceed 95%, and the emission concentrations consistently meet environmental protection requirements. It is recommended to complete the working condition test before selection, and match the equipment specifications according to the concentration, composition and air volume.