Air Pollution Advice

Automotive Manufacturer Installs RTO for VOC Control

Written by Jan Carlson | Oct 23, 2025 3:05:00 PM

Catalytic Products International (CPI) recently installed a new Regenerative Thermal Oxidizer (RTO) in the paint shop at a Midwest USA automobile manufacturer for the control of Volatile Organic Compounds (VOCs).

  • Process Type: E-Coat Oven
  • VOCs: Automotive parts coatings
  • Air Volume: 18,000 SCFM
  • Control Type: Regenerative Thermal Oxidizer (RTO)
  • Destruction Rate Efficiency (DRE): 98%
  • Installation: RTO, Pre-compliance testing

The 18,000 SCFM TRITION 18.95 Regenerative Thermal Oxidizer (RTO) controls VOC emissions from a single electrodeposition (ED) coating line oven with 98% destruction rate efficiency (DRE) and a thermal efficiency of 95%.

Thermal treatment of VOCs and other air pollutants works by a simple reaction of the harmful hydrocarbon-based air pollutants with oxygen and heat. In this environment, the VOCs are oxidized to form harmless inert by-products like CO2, water vapor (H2O), and usable heat. These harmless by-products are released to the atmosphere or used within primary or secondary energy recovery techniques to further lower the operational costs.

CPI Regenerative Thermal Oxidizers (RTOs) are engineered to provide exceptional performance and reliability. During operation of the standard two chamber RTO, the VOCs are directed into one of the system’s regenerators, an internally insulated vessel containing specialized ceramic media which allows thermal rate efficiencies up to 97%. The contaminated gases are passed through the first regenerator where energy is transferred from the ceramic media to the gas in order to elevate the temperature. This elevated temperature approaches the ignition level for most solvents and is then directed from the ceramic bed into the combustion chamber. As the stream exits the ceramic bed and travels through the internally lined combustion chamber, minimal heat is added to ensure a proper oxidation temperature and a designed dwell time is maintained providing destruction of the VOCS at greater than 98% efficiency. The resultant clean, oxidized gases are directed to the second regenerator to absorb the heat energy before being released to the atmosphere.

CPI worked closely with the Engineering, Procurement, and Construction (EPC) firm as well as the end user customer to design, fabricate, and deliver the Regenerative Thermal Oxidizer (RTO). CPI provided a heavy gauge galvalume and steel weather cover/shelter and supports over the burner and poppet valve cylinders and the poppet deck. CPI also conducted pre-compliance testing of the RTO system utilizing the services of a qualified testing firm, using EPA Method 25A. CPI on-site supervision ensured coordination with the EPC and their subcontractors as well as the final customer. This approach, along with CPI start-up and commissioning, guaranteed that entire system was installed correctly, returning the customer to fully operational status with minimal downtime.

CPI has been “Enabling Clean Production™ Since 1969” and continues as a leading supplier and manufacturer of Regenerative Thermal Oxidizers (RTO) for large and small air volume VOC applications.  CPI is at the forefront in providing industries including the automobile industry with solutions to their air pollution VOC control needs.

Today, CPI partners with its customers as a trusted resource in resolving the most complex air pollution and energy conservation problems. We provide our customers with innovative and cost-conscious regenerative thermal oxidizer (RTO) solutions to their most complex VOC, NOx, and Odor pollution challenges. Our equipment is also at work meeting energy conservation strategies and minimizing greenhouse gas (GHG) emissions.