Adsorption
VOC Concentration
Envanio’s VOC concentration process uses adsorption to concentrate dilute solvent emissions. For cost-effective air pollution control, adsorption is recommended first to concentrate large exhaust airflows with low pollutant loads. The concentrated exhaust air is then routed to downstream recuperative or regenerative thermal oxidation for highly energy-efficient destruction.
Lowering Operation Costs
Thanks to the high concentration ratio up to 30:1, CO2 emissions, and operating costs are significantly reduced compared to direct thermal purification.
Low-Maintenance Design
With the slow-turning rotor as its only moving part, the robust Envanio system requires minimal maintenance, delivering high operational reliability and a long service life.
Process-Integrated Heat Recovery
Through optimized flow control, heat from the downstream oxidizer can be recovered to supply the desorption air, maximizing the system's thermal and material efficiency.
Adsorptive Concentration of Large Air Flow Rates with Low Pollutant Concentrations
| Process | Adsorption |
|---|---|
| Air Flow Rate | 13,000 SCFM to 150,000 SCFM per adsorber unit* |
| Solvent Concentration | up to 1,000 ppmv as C3 |
| Concentration Ratio | up to 30:1 |
| Exhaust Gas Temperature | up to 104 °F |
| Desorption Temperature | up to 428 °F |
| Capture Efficiency | up to 99% |
| Typical Target Pollutants | Hydrocarbons, alcohols, acetates, chlorinated hydrocarbons, glycols, aldehydes, ketones |
*Individual modules can be easily combined, meaning there are no limits to the volume of exhaust air that can be cleaned.
Each system is custom-designed based on your requirements and processes.
The Design of Our VOC Concentrator
The centerpiece of the system is the vertical rotor disc, which is divided into adsorption, desorption, and cooling zones. The temperature-resistant adsorber consists of a honeycomb-structured support material coated with zeolite. This honeycomb structure reduces pressure loss and, consequently, lowers the system’s electrical energy consumption. One or more integrated pre-filter stages protect the adsorber material from clogging caused by dust or paint particles, contributing significantly to a long service life.
Typical Applications for VOC Concentrators
Envanio designs and manufactures systems for the concentration of volatile organic compounds to meet the strict emission-control demands of your specific production processes. Thanks to their modular design and rugged construction, our VOC concentrators are widely utilized across a diverse range of industrial sectors:
- Surface Treatment View Industry VOC concentration is used upstream in painting, printing, and coating surfaces to concentrate large volumes of exhaust air with low VOC concentrations, allowing it to be treated efficiently and cost-effectively.
- Wafer Manufacturing View Industry In wafer manufacturing, VOC concentration is used upstream to concentrate large volumes of cleanroom exhaust air with low VOC concentrations before efficient, cost-effective final treatment.
- Automotive Industry View Industry VOC concentration serves upstream in automotive paint shops, concentrating high-volumes exhaust air with low solvent concentrations so it can be treated cost-effectively.
360° Service for Your Air Pollution Control System
Take advantage of our 360° support for air pollution control systems from Envanio or third-party manufacturers. Our service teams support your plant throughout the entire equipment lifecycle, providing routine inspections, preventative maintenance, system audits, efficiency retrofits, repairs, and genuine replacement parts.
FAQ
A VOC concentration system is not suitable for exhaust air containing formaldehyde, methanol, or methyl chloride. It is also not recommended for streams with strongly acidic or alkaline inorganic compounds, sulfur compounds, halogens, heavy metals, plasticizers, or oil mists.
More Ways to Treat Exhaust Air
To deliver solutions tailored to your specific requirements and varying operating conditions, Envanio offers a wide range of standard and custom-engineered air pollution control systems based on thermal oxidation.
Regenerative Thermal Oxidation
Regenerative thermal oxidation (RTO) is a highly efficient process that cleans industrial exhaust by destroying hazardous air pollutants (VOCs and HAPs) and eliminating unpleasant odors. By using internal ceramic heat exchange media, the system traps and recycles its own heat, making the entire purification process incredibly energy efficient.
Electric Regenerative Thermal Oxidation
Envanio's electrically heated regenerative thermal oxidizer (eRTO) combines high VOC destruction efficiency, operational reliability, and exceptional energy performance. By using electric heating elements instead of gas-fired burners, the system avoids combustion-related byproducts and significantly reduces NOₓ emissions. The result is a cleaner, more sustainable solution for industrial air pollution control.
Recuperative Thermal Oxidation
Recuperative thermal oxidation is a highly efficient process that cleans industrial exhaust air by destroying hazardous air pollutants (VOCs and HAPs) and eliminating unpleasant odors. The system is also well suited for processes where particulate matter and aerosols are generated. An integrated metallic shell-and-tube heat exchanger enables efficient primary heat recovery.
Direct Fired Thermal Oxidation
Direct fired thermal oxidation is a highly efficient process that cleans industrial exhaust by destroying hazardous air pollutants (VOCs and HAPs) and eliminating unpleasant odors. The system is particularly well-suited when heavily contaminated exhaust streams must be treated reliably with high removal efficiencies, and when complex heat recovery systems are not economically feasible.
Activated Carbon Adsorption
Envanio’s activated carbon adsorption is based on the physical adsorption process to purify industrial process air of volatile organic compounds (VOCs) and hazardous air pollutants (HAPs) from industrial exhaust air, with the option for solvent recovery. In our regenerative systems, both the adsorbent and solvents are recovered for reuse, while in non-regenerative systems, the spent activated carbon is safely disposed of or replaced along with the captured pollutants.
Catalytic Hot Gas Filtration
Envanio’s catalytic hot gas filtration is based on an integrated 3-in-1 process for industrial hot gas and exhaust air purification. Rigid, high-temperature ceramic filter elements enable the simultaneous removal of particulate dust, heavy metals, sulfur oxides (SOx), and nitrogen oxides (NOx) from process exhaust in a single compact system.
Wet Scrubbing
Envanio’s wet scrubbers rely on absorption for the wet separation of inorganic compounds, particulates, mist, and acidic gases. During the regenerative or direct-fired thermal oxidation of halogenated hydrocarbons or sulfur compounds, substances such as hydrogen halides or SOx are generated, which must be scrubbed from the exhaust air in a downstream wet scrubber.
Wet Electrostatic Precipitator
Envanio’s wet electrostatic precipitator is an advanced gas cleaning system designed to remove fine particulate matter, submicron dust, acid mists, aerosols, and condensed volatile compounds from aggressive process exhaust. Operating at high energy intensities with optimized discharge electrodes, it ensures maximum pollution control performance while dramatically reducing maintenance requirements.
Let's Talk
Please contact us directly to schedule a personal consultation or submit your project details using our contact form to receive a complementary, no-obligation quote.
Matt Konkle
Director Sales America
