Compression condensation plus membrane separation, higher recovery rate of treatment

in VOCswaste gas treatmentThe single condensation process is limited by the gas-liquid equilibrium, and even if the temperature is reduced to a very low level, a certain concentration of organic matter remains in the tail gas-the higher the recovery rate, the greater the increase in marginal energy consumption. Although a single membrane separation can efficiently concentrate organic matter, it cannot be directly liquefied and recovered.

The combined process of compression condensation and membrane separation is a complementary scheme designed for both short boards.

The process uses a combined route of "compression condensation membrane separation" to form a closed cycle. The waste gas is first pressurized by a compressor to increase the partial pressure of organic compounds, thereby creating favorable conditions for subsequent condensation. The pressurized gas enters the multi-stage condensation unit, and most of the organic matter is directly liquefied from the gaseous state to the liquid solvent by stage cooling.

The condensed tail gas still contains a small amount of organic compounds that have not been liquefied; this portion of the gas enters the membrane separation unit.gas separation membraneBy leveraging the difference in permeation rates between organic molecules and air molecules through the membrane material—organic compounds preferentially pass through the membrane to form a concentrated gas stream, which is then returned to the compressor inlet, mixed with fresh exhaust gas, and reintroduced into the condensation process—while the retained air is discharged after meeting emission standards. Through the concentration cycle of the membrane unit, the system forms a closed recovery loop, and the overall recovery rate can reach more than 95%.

Compared to either single condensation or single membrane separation, this integrated process combines value recovery with compliance with emission standards within a single system. process is powered by electricity, does not consume natural gas, noactivated charcoalWait for consumables to be replaced; no hazardous waste is generated. Compared with the traditional cryogenic technology, the energy consumption of membrane recovery can be reduced by more than 60%.