How to choose condensation recovery and adsorption concentration? Comparison and analysis of VOCs solvent recovery process route

The process route selection of VOCs solvent recovery can not get around the two main lines of condensation and adsorption: condensation recovery directly liquefies and retrieves the solvent, while adsorption concentration enriches the low concentration gas and then processes it. Each of the two routes is good at intervals and is often used in combination. This paper compares the three dimensions of intake concentration, component characteristics and operating cost to help the selection of the right seat.

The principle difference between the two routes

• Condensation recovery: reduce the temperature to liquefy the solvent vapor, and the recovered material is the solvent itself;
• Adsorption concentration:activated charcoal/Zeolite and other media capture solvent molecules, after saturation desorption regeneration;
• Combined process: condensation treatment high concentration section, membrane separation treatment tail gas section, each tube section.

three-dimensional contrast

How to choose

1. High concentration of inlet air and large solvent value: priority condensation recovery, direct reuse of recovered materials, good economic accounting;
2. Large air volume and low concentration: adsorption and concentration route can be considered, or air reduction and concentration increase before condensation;
3. Complex components, large concentration fluctuations: the combined process has strong anti-fluctuation ability, membrane separation bottom standard.

Positioning of the combined process

In the actual project, the positioning of the combination of condensation and membrane separation is "recovery-oriented, standard-reaching bottom": the solvent in the high concentration section returns to production in the form of liquefaction, the residual tail gas is separated by membrane to ensure stable emission, users do not need to frequently replace consumables, and operation management is relatively worry-free. The specific type selection is still recommended to be based on the measured gas volume and composition.

Adsorption route is not good?

No. Large air volume low concentration scene adsorption has advantages, but media replacement and hazardous waste disposal is a long-term cost, the selection should be calculated in the general ledger.

Can the two routes be mixed?

Sure. Some projects adopt the combination of condensation recovery of main solvent and adsorption of bottom tail gas, which are customized according to working conditions.

LuoyangWohong PetrochemicalEquipment Co., Ltd. (Wohong Petrochemical) focuses on the design and manufacturing of VOCs organic solvent liquefaction and recovery equipment, supporting customization according to solvent types and working conditions. Welcome to inquire by phone.