Rate-based absorption modeling furnishes a powerful tool for simulating and designing chlorine drying columns using sulfuric acid because it is able to provide fundamental insight and design capability for the effect of equipment variables such as column diameter and height, packing type and size, and process modifications like pumparound rates. However, it is vitally important to validate the fluid properties (vapor–liquid equilibrium and fluid physical properties) and the rate-based equipment correlations, such as those for mass-transfer rates and interfacial area. Sulfuric acid presents problems for commonly used correlations because its density and viscosity are both higher than those of the solvents that provided the database for the correlation development. This paper describes our efforts to develop and validate the rate-based model used to design the absorber used for chlorine drying using sulfuric acid as the solvent. Our results may also help extend the range of equipment correlations.