Compression condensation membrane separation process for high concentration VOCs waste gas recovery equipment

Compression condensation membrane separation process for high concentration VOCs waste gas recovery equipment

High concentration VOCs exhaust gas (usually referring to concentrations above 1000mg/m ³) has the characteristics of high solvent content per unit volume and significant recovery value. For this type of exhaust gas,activated charcoalAdsorption faces problems of fast saturation and frequent carbon replacement, while combustion methods can meet standards but completely destroy high-value solvents. The compression condensation membrane separation process provides an alternative path centered on physical recovery.

Process Principle

This process adopts a combination route of "compression+condensation+membrane separation" to form a closed-loop cycle. The exhaust gas is first pressurized by a compressor to increase the partial pressure of organic matter, creating favorable conditions for subsequent condensation. The pressurized gas enters the multi-stage condensation unit, and the temperature gradually decreases from room temperature to minus 15 to minus 25 degrees Celsius. Most of the organic matter is directly liquefied from gas to liquid solvent, which can be reused in production after being separated by a collection tank.

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 membraneBy utilizing the difference in permeation rate between organic molecules and air molecules in membrane materials, organic matter preferentially passes through 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. Through the concentration cycle of membrane units, the system significantly improves the capture efficiency of organic matter, and the overall recovery rate can reach over 90%.

Technical Features

This process is driven by electricity and does not consume natural gas. There is no replacement of consumables such as activated carbon during operation, and no hazardous waste is generated. The process operates at room temperature to low temperature, without combustion or open flames, and has good applicability in explosion-proof places such as chemical, pharmaceutical, and storage tank areas. The equipment adopts a pry mounted structure, with each unit integrated on a steel base. It is assembled and debugged before leaving the factory, and can be put into operation on site by simply connecting the power supply and gas circuit. The installation cycle is short and the footprint is small.

Applicable working conditions and selection suggestions

This process is suitable for VOCs waste gas with medium to high concentrations (above 1000mg/m ³) and solvent recovery value. It has good separation effects on common solvents such as ketones, esters, hydrocarbons, halogenated hydrocarbons, and alcohols. Research has shown that the system can achieve a good balance between recovery efficiency and operating energy consumption at a condensation pressure of 0.55 MPa and a condensation temperature of around -10 ℃.

Before selecting, it is recommended to complete a working condition test to obtain accurate basic parameters such as concentration, composition, and air volume. LuoyangWohong PetrochemicalEquipment Co., Ltd. focuses on the field of VOCs membrane recycling and can provide process design and equipment manufacturing services based on customer operating parameters. First, conduct a working condition test and speak with the data.