Compression Condensation Membrane Separation Process VOC Exhaust Gas Treatment Solvent Recovery Equipment, Recovery Rate 95%
The compression condensation membrane separation process is a VOC exhaust gas treatment technology based on physical separation. This equipment achieves treatment of medium-to-high concentration, recoverable organic exhaust gases through the coordinated operation of three units: compression, condensation, and membrane separation, with a recovery rate of over 95%.
The equipment consists of three core units. The exhaust gas first enters the compression unit where a compressor increases the pressure, raising the partial pressure of organic compounds to create favorable conditions for subsequent condensation. The pressurized gas then enters the multi-stage condensation unit, where stepwise cooling transforms most organic compounds from the gaseous state to liquid. The liquefied solvent is separated through a collection tank and can be directly reused in production. The condensation unit employs a non-uniform temperature distribution strategy — high-boiling components liquefy in large quantities at higher temperature ranges, while low-boiling components are captured at lower temperature ranges, balancing recovery efficiency and refrigeration energy consumption.
The tail gas after condensation still contains small amounts of non-liquefied organic compounds. This gas stream enters the membrane separation unit. The gas separation membrane utilizes the difference in permeation rates of organic molecules and air molecules through the membrane material — organic compounds preferentially permeate the membrane layer to form a concentrate, which is sent back to the compressor inlet and mixed with fresh exhaust gas for another round of condensation treatment; air is retained and discharged after meeting emission standards. Through this concentration cycle using the membrane unit, the system forms a closed-loop recovery circuit, achieving an overall recovery rate of over 95%.
The equipment is powered by electricity, consumes no natural gas, requires no consumables such as activated carbon replacements, and produces no hazardous waste. The process involves no combustion, no open flames, and is well-suited for explosion-proof environments such as chemical plants, pharmaceutical facilities, and tank farms. The equipment features a skid-mounted structure, with all units integrated on a steel base frame. It is fully assembled and tested before leaving the factory; on-site, only power and gas connections are needed to start operation, with short installation lead time and small footprint. Equipped with a PLC fully automatic control system, it automatically starts and stops based on exhaust gas generation, requiring no dedicated operator.
This equipment is suitable for medium-to-high concentration (above 1000 mg/m³) VOC exhaust gases where solvents have recovery value. Common recoverable solvents include ketones, esters, hydrocarbons, halogenated hydrocarbons, alcohols, ethers, and others. Pre-selection exhaust gas testing should be completed to obtain basic parameters including concentration, composition, and flow rate. Luoyang Wohong Petrochemical Equipment Co., Ltd. specializes in the VOC membrane recovery field and provides equipment design and manufacturing services tailored to customer operating parameters. Conduct exhaust gas testing first and make decisions based on data.