VOCs tail gas liquefaction membrane separation and recovery scheme, combined process of condensation and membrane separation

VOCs tail gas liquefaction membrane separation and recovery scheme: combined process of condensation and membrane separation, with a recovery rate of over 95%

In the production processes of industries such as pharmaceuticals and petrochemicals, high concentrations of VOCs not only put pressure on subsequent purification treatment, but also lead to significant loss of solvent raw materials. The condensation membrane recovery process provides a mature technology route with physical separation as the core for the recovery of organic waste gas with medium to high concentration and recycling value.

Process Principle

This process adopts a combination of "compression+condensation+membrane separation". The exhaust gas is first compressed and pressurized to increase the partial pressure of organic matter, creating conditions for subsequent condensation. The pressurized gas enters the condensation unit and is cooled to transform most of the organic matter from gas to liquid. The liquefied solvent is separated by a collection tank and can be directly reused in production.

The exhaust gas after condensation treatment still contains a small amount of organic matter that has not been liquefied, and this gas enters the membrane separation unit.gas separation membraneUtilizing the difference in permeation rates of different molecules in membrane materials - VOC molecules preferentially penetrate the membrane layer to form concentrated gas, which is then sent back to the compressor inlet and mixed with fresh exhaust gas before entering the condensation process again; Air is intercepted and discharged in compliance with standards. This closed-loop design significantly improves the system's efficiency in capturing organic matter.

Technical advantages

High recycling rate. The combination process can recover 95% to 99% of volatile organic compounds in the mixed gas, and the organic solvent recovery rate can reach over 90%.

Low operating energy consumption. Compared to traditional cryogenic technology, membrane separation as a pre concentration unit can reduce the processing air volume of the condensation unit and reduce comprehensive energy consumption by more than one-third.

No secondary pollution. The process does not generate secondary pollutants such as wastewater and solid waste, does not involve combustion, and has good applicability in explosion-proof places.

Wide applicability. This process is suitable for a wide range of concentrations and has a good recovery effect on VOC gases with concentrations above 1000mg/m ³. It can be easily embedded into existing systemswaste gas treatmentsystem