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Overview of Sulfuric Acid Corrosion

Sulphuric Acid Corrosion is an acidic environment "disease" commonly occurring in sulfuric acid alkylation units where process control or water contents of acids deviate from design operation. As with HF alkylation units, sulfuric acid carryover into equipment and piping systems that were not constructed to resist sulfuric acid at certain concentrations and temperatures can lead to higher corrosion rates. Reactor effluent lines, reboilers, deisobutanizer overheads, caustic treating systems, and flare lines are particularly vulnerable. However, with rigid control of acid concentration, fluid velocity, temperature and the avoidance of acid carryover, sulfuric acid alkylation units can be operated reliably with high integrity.

 

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