Acid Gas Scrubber Produces 98% Sulfuric Acid A large petrochemical plant uses Oleum, another name for fuming Sulfuric Acid, in a process for treating heavy hydrocarbons. Fuming Sulfuric Acid is made by pumping Sulfur Trioxide gas (SO3) into 98% Sulfuric Acid, kind of like “carbonation. ” The SO3 scavenges the 2% water to form 100% Sulfuric Acid. If the acid is allowed to contact the atmosphere, the excess SO3 present will react with water vapor in the air to form sub-micron Sulfuric Acid aerosol, hence the term “fuming. ” Oleum is added to the process vessel, which is blanketed with Nitrogen, and displaced Nitrogen and SO3 are vented to maintain a constant pressure of 15 psig within the vessel. If allowed to vent directly to atmosphere, most of the SO3 would convert to a dense, white, unsi

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