Recently, the internally Heat-Integrated Distillation Columns (HIDiC) technology attracts a lot of industrial and academic interests, since the energy savings performance has been proved by national projects in Japan. In the previous HIDiC R&D project, a pilot plant of the HIDiC with structured packings was built in 2005. It was applied to separate twelve-component hydrocarbons mixture, and continuously and steadily operated for > 1000 hr. To establish a concise model for the packed column type HIDiC, a rate-based model was modified. Analyses of the data obtained by the pilot HIDiC operations were performed with the rate-based model for the HIDiC. Significant outcomes from the study were presented. This is an abstract of a paper presented at the 2006 AIChE National Meeting (San Francisco, CA 11/12-17/2006).