Summary
In oil refining, H2SO4 is used as a catalyst for the alkylation process, which combines small-chain molecules (C3-C5 olefins) to create gasoline-blending stock (alkylate) to increase gasoline octane value.
The corrosiveness of sulphuric acid depends primarily on acid concentration and temperature. In addition, velocity and the presence of impurities in the acid (e.g., oxygenates and dissolved iron) can have a significant impact on corrosion. The corrosion reaction between steel and strong sulphuric acid generates ferrous ions (Fe2+).