How to recover VOCs waste gas from isopropanol? Application of Condensation and Membrane Separation Process in IPA Solvent Recovery

Isopropanol (IPA) is one of the most widely used cleaning and extraction solvents in the electronics, pharmaceutical, and fine chemical industries. It has strong volatility and low flash point, and the isopropanol vapor in workshop exhaust not only causes material loss but also poses safety hazards. The combined process of compression condensation and membrane separation is used to treat isopropanol VOCs waste gas, which can liquefy and recover most of the solvents for reuse. The tail gas is discharged in compliance with standards through membrane separation, balancing safety and economy.

Characteristics of operating conditions of isopropanol exhaust gas

• Moderate boiling point, efficient liquefaction and recovery can be achieved under compression condensation conditions;
• Cleaning and wiping processes are mostly intermittent emissions, with significant fluctuations in gas volume;
• The mixed concentration range with air is wide, and the high concentration range needs to be focused on prevention and control.

Condensation and membrane separation recovery process

1. Exhaust gas collection: Exhaust points such as cleaning tanks, ovens, and reaction vessels are collected through pipelines and sent to buffer tanks;
2. Compression condensation: After pressurization, it enters the condensation unit and undergoes isopropanol vapor liquefaction for recovery;
3. Membrane separation purification: residual low concentration exhaust gas is treated with VOCs separation membrane to meet emission standards;
4. Recycling: The enriched gas on the permeate side of the membrane is refluxed to the compression section, and the solvent does not leak out.

Comparison of Recycling Plans

Implementation suggestions

When selecting the isopropanol recovery device, it is recommended to calculate the condensation load based on the peak gas volume and exhaust concentration in the workshop, and configure the membrane components according to the exhaust gas composition and flow rate. The device shall be supplied by dismantling, and the explosion-proof area shall be equipped with electrical components according to the on-site grading requirements. The whole machine shall be tested before delivery.

Can the purity of recycled isopropanol meet the requirements for reuse?

The condensate recovery liquid is collected in batches and can be returned to cleaning and other processes for reuse after being subjected to static separation or refining treatment. The specific indicators are subject to the workshop process requirements.

Is a small cleaning station worth installing?

It is recommended to calculate the overall gas volume of the workshop uniformly and consolidate multiple workstations 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.