Process system engineering (PSE) analysis on process and optimization of the isomerization process

Document Type: Research Article


1 department of applied chemistry and chemical technology, university of karachi

2 Department of Dhemical Engineering, NED University of Engineering and Technology, Karachi, Pakistan

3 department of polymer and petrochemical engineering ned university of engg. and tecg, karachi

4 department of chemical engineering ned university

5 department of chemical engg. ned university

6 department of food engineering, ned university of engg. and tech


Oil refineries are facing the ever strict restriction in terms of fuel specification in view of the several policies by environmental impact agency (EIA). Strict rules have been enforced on the gasoline product specification. Isomerization is one of the key processes for increasing the octane number of gasoline. Hence a case study has been performed using the concept of hydrogen once-through technology to analyze the process constraints for optimal operation of the process using Aspen HYSYS. In addition to this, a rigorous process model of isomerate stabilizer was also used to compare the results of stabilizer model and optimize those various variables affecting the octane number of gasoline. The model was validated by observing the effects of constraints on the efficiency of the process by comparing it with the operational isomerization unit to further verify the authenticity of the case study. Furthermore, a calculator has been generated for the reactor temperature with respect to high benzene contents in the feedstock (benzene in feed Vs reactors ΔT).