Apollo Scrubber Teams Up With Thermal Oxidizer A southwestern oil refinery had a pair of spent acid tanks for holding Hydrocarbon-Sulfuric Acid mixtures unloaded from barges. The head space of the tanks contained n-Propane and Sulfur Dioxide (SO2) blanketed with Nitrogen, which would get displaced with inflowing liquid during filling. The displaced gases could not be directly vented to atmosphere due to limits on allowable Volatile Organic Carbon (VOC) and SO2 emissions, SO2 being one of the six “criteria pollutants” identified by U.S. EPA ’s National Ambient Air Quality Standards (NAAQS). The SO2 would have to be controlled in a wet scrubber, whereas the n-Propane, not treatable with wet scrubbing, would most feasibly be controlled by thermal oxidation. To avoid SO2 corrosion in the ox

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