How to recover cyclohexane VOCs waste gas? Application of Condensation and Membrane Separation Process in Cyclohexane Recovery

Cyclohexane is the basic raw material in the production chain of nylon and caprolactam, and it is also a commonly used solvent in the coatings and pharmaceutical industries. The characteristic of its exhaust gas is high concentration but single component, and the conditions for condensation and recovery are very good. The combined process of compression condensation and membrane separation is used to treat cyclohexane VOCs waste gas. The high concentration section is liquefied and directly reused, and the tail gas is discharged after membrane separation to meet the standard. This is a typical recycling treatment route.

Recovery conditions of cyclohexane waste gas

• Moderate boiling point, conventional condensation temperature can achieve high liquefaction recovery rate;
• Single component, condensate can be collected and reused without complex water separation;
• The flash point is relatively high, and the safety configuration in the storage and transportation process is relatively easy.

Recycling process flow

1. Exhaust gas collection: Each exhaust point is collected through a pipeline to a buffer tank to stabilize gas volume fluctuations;
2. Compression condensation: After pressurization, it enters the condensation unit, where most of the cyclohexane vapor liquefies;
3. Membrane separation purification: residual low concentration exhaust gas is treated with VOCs separation membrane to meet the standard;
4. Circulating reflux: The enriched gas on the membrane permeation side is refluxed to the compression section, and the solvent does not leak out.

The relationship between condensation temperature and recovery rate

The device design will find a balance point between recovery rate and power consumption: the conventional configuration is based on staged condensation, with membrane separation at the bottom to ensure stable emissions, without having to bear excessive operating power consumption in pursuit of ultimate condensation.

Does cyclohexane condensate contain water?

Cyclohexane has poor miscibility with water, and the condensate can be separated by standing, making it easy to collect and reuse after separation.

Is it worth installing a small displacement cyclohexane exhaust device?

Suggest collecting multiple exhaust streams for unified treatment, selecting devices based on total gas volume for better economic efficiency.

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.