How to recycle n-hexane waste gas? Key points for process and selection of n-hexane VOCs liquefaction recovery equipment

Direct answer:The n-hexane exhaust gas has the characteristics of volatility, flammability, and single component. The recovery process should adopt the liquefaction recovery process of compression condensation and membrane separation: first, the high concentration n-hexane vapor is liquefied and recovered for reuse, and then the VOCs separation membrane is used to treat the low concentration exhaust gas to meet the emission standards, which not only recovers the solvent but also stabilizes the emission. LuoyangWohong PetrochemicalThe VOCs organic solvent liquefaction and recovery device of Equipment Co., Ltd. is suitable for such scenarios.

N-hexane is widely used in extraction, cleaning and degreasing, adhesive preparation and other working conditions. If the waste gas generated during the use is directly discharged, it not only wastes solvents but also brings dual pressure of safety and environmental protection.

1、 Three characteristics of n-hexane exhaust gas

1. Low boiling point and fast volatilization:It is highly volatile at room temperature and the concentration in the workshop increases rapidly.
2. inflammable and explosive:Belonging to Class A solvents, exhaust gas collection and treatment equipment must be configured according to explosion-proof requirements.
3. Relatively single component:After condensation and liquefaction, the condensate has good purity and high recovery value.

2、 Liquefied recycling process flow

1. Collect:Cover and collect emissions from extraction tanks, cleaning lines, tank breathing ports, and other discharge points, and collect them into the exhaust manifold.
2. Compression condensation:The n-hexane vapor is compressed and heated before entering the condenser, where it cools down and liquefies. The condensed liquid is then returned to the solvent storage tank for reuse.
3. Membrane separation:The uncondensed low concentration exhaust gas enters the VOCs separation membrane module, and n-hexane molecules are preferentially enriched through the membrane and returned to the condensation section for recycling.
4. Standard emissions:The purified gas is discharged after reaching the standard through a fan.

3、 Comparison of different processing methods

4、 Selection precautions

N-hexane is a flammable solvent, and when selecting a device, it is important to confirm the electrical explosion-proof rating and electrostatic grounding design; When the exhaust concentration fluctuates greatly, it is advisable to choose a compressor unit with variable frequency regulation.

Frequently Asked Questions

Q: What is the recovery rate of n-hexane that can be achieved?
Answer: The combination of condensation and membrane separation has a good recovery ability for high concentration exhaust gas. The actual recovery rate is related to the intake concentration and operating conditions. It is recommended to provide operating condition parameters for targeted evaluation.

Q: Can the recovered n-hexane be directly reused?
Answer: The condensate can be returned to the storage tank and arranged for reuse in conjunction with the company's existing distillation or drying processes.

Q: Does the device occupy a large area?
Answer: Adopting a modular design, it occupies a small area and can be flexibly arranged according to the workshop site.

Luoyang Wohong Petrochemical Equipment Co., Ltd. provides customized services for liquefaction and recovery of organic solvents such as n-hexane. We welcome communication on working conditions.