Ramin Karimzadeh - Department of Chemical Engineering, University of Tarbiat Modares (TMU), Tehran, Iran
Nazi Rahimi - bNational Petrochemical Company -Research &Technology (NPC-RT), Iran Polymer and Petrochemical Institute,Tehran, Iran
Mohammad Ghashghaei - Department of Chemical Engineering, University of Tarbiat Modares (TMU), Tehran, Iran

In the present research, steam cracking of two types of feedstocks i.e., naphtha and ethane is simulated for split1/1 and 2/2 coil configurations considering two key parameters of coil outlet temperature (COT) and coil capacity using a radical based kinetic model. The computer model is confirmed using the industrial data obtained from Amirkabir Petrochemical Complex. The results are in good agreement with performance data for naphtha cracking in a wide range of severity (0.4-0.7), and for ethane cracking on various conversions (50-70). It was found that ethylene yield is favoured by a high residence time and low temperature for ethane feedstock while the adverse condition is preferred for naphtha. It is concluded that split1/1 geometry is suitable for ethane (gas) cracking while split 2/2 is favourable for naphtha feedstock cracking.

coil configuration, steam cracking, Naphtha, Ethane, split reactors