What factors are considered when selecting a solvent for gas absorption?

Key factors include: high solubility of the target gas (high capacity reduces solvent circulation), high selectivity for the target component, low vapor pressure (minimizes solvent losses), low viscosity (improves mass transfer), chemical stability (withstands process conditions), low corrosivity (reduces equipment costs), availability and cost, and ease of regeneration. For acid gas removal, amines are selected for high reactivity; physical solvents like Selexol for bulk removal.