Organic tail gas treatment unit, combined process of condensation film recovery

There are two common ways to treat organic tail gas:activated charcoalAdsorption orRTOBurning. Adsorption method transfers organic matter from gas phase to solid phase, saturated carbon becomes hazardous waste, and disposal costs continue to be generated. The combustion method burns organic matter into carbon dioxide and water, which meets the standard, but the solvent is gone, and the gas fee has to be paid.

The combined process of condensed film recovery takes a different path. The process combines membrane separation technology with condensation technology for VOCswaste gas treatmentIt mainly aims at the organic waste gas with medium and high concentration and recycling value, and realizes the organic matter recovery through physical separation and phase change.

The front stage of the process is a membrane separation and concentration unit. The core of membrane separation is to use the difference in the permeation rate of gas components in the membrane material. After the exhaust gas enters the membrane module, driven by the pressure difference on both sides of the membrane, VOC molecules preferentially penetrate the membrane layer to form a permeation gas, and air components such as nitrogen and oxygen are trapped and discharged as purified gas. This process can increase the concentration of VOC by a factor of 5 to 10.

The latter stage of the process is the condensation recovery unit. The concentrated high-concentration VOC gas enters the condensation unit, and the organic matter is converted from a gaseous state to a liquid state by reducing the temperature. The condensation temperature depends on the boiling point of the target component and is usually in the range of -10°C to 15°C. The liquid solvent obtained by condensation can be directly collected and stored for use in production.

The process is suitable for working conditions where the exhaust gas concentration is above 1000mg/m³ and the organic solvent has recovery value. Common industries include petrochemical, pharmaceutical, printing and packaging, lithium batteries, gas stations, etc. The process is driven by electric power, does not involve combustion, no open flame, and has good applicability in explosion-proof places. No hazardous waste such as saturated activated carbon is produced, and the recovered liquid solvent can be reused or sold. Before selecting equipment, it is recommended to first conduct a process condition assessment to determine the concentration, composition, and airflow rate, and then match the equipment specifications accordingly.