In this study, results of revamping of stabilizer unit of Shiraz refinery which includes a debutanizer, and a splitter column, are presented. The unit is consisted of a de-butanizer and a splitter. The products of the unit are light straight run gasoline (LSRG) and Heavy straight run gasoline (HSRG). Revamping has been carried out by a commercial software. Results of simulation illustrated that revamping by structured packings is an effective method for capacity increase while maintaing product quality at the same time. Debutanizer and splitter units have been simulated with regard to inlet and outlet flow rates, flooding, operating pressure and temperature. The simulation results are in good agreement with the operating data and experimental analysis. By using MELLAPAK 250X, as a structured packing in revamping process, pressure drop was decreased from 196 to 23 mBar. In addition, Sichlmair model has predicted the pressure drop very accurately. The results also demonstrate 31 % capacity increase in feed flow rate and higher quality product.

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