The mass transfer performance of SO, absorption in an aqueous solution of a newly proposed organic amine absorbent, N,N'-bis(2-hydroxypropyl)piperazine (HPP), was studied by the dynamic absorption method in a theta-ring packed column. The absorption performance was interpreted in terms of the overall mass transfer coefficient, K(G)a. The experimental results showed that the K(G)a value increased with an increase in the liquid flow rate, concentration, and initial pH of HPP absorbent. However, it decreased with an increase in temperature, SO2 partial pressure, and gas flow rate. An empirical correlation for the overall mass transfer coefficient is subsequently developed as a function of the process parameters. The obtained K(G)a from empirical correlation is found to be in relatively good agreement with the experimental results with a mean relative deviation of 6.6%, which could be used for engineering design.