OP-II-3

KN-5for addressing the quality of the produced naphtha (detailed PIONA, sulfur, nitrogenand oxygenates content, etc.). Cracking of the renewable naphtha leads to high lightolefin yields and low amounts of aromatics. For a residence time of 0.4 s, a CoilOutlet Pressure (COP) of 1.7 bar, a dilution of 0.45 kg steam per kg hydrocarbonsand Coil Outlet Temperature (COT) of 850°C, the renewable naphtha gives anethylene yield of 31 wt% and a propylene yield of 17.5 wt%. The absence of asignificant naphthenic and aromatic fraction in the feed results in low C5+ yields, lowamounts of pyrolysis gasoline and an almost non-existing amount of pyrolysis fuel oil.The influence of the process conditions on the product yields is as expected. 5 Athigher severities more methane, ethylene, 1,3-cyclopentadiene, benzene and tolueneare formed. The propylene yield is highest at a COT of 820°C. Higher dilutions resultin higher light olefin yields and lower amounts of C5+ products for identical processgas-temperatureprofiles. Comparison with results obtained of several oil derivednaphthas shows that the renewable naphtha can be considered as a very attractivefeedstock for a steam cracker. The latter is confirmed by coking runs [COT = 850°C;δ = 0.45 kg/kg; COP = 1.7 bar] with and without DMDS addition and comparison withcoking data of reference feeds. The renewable naphtha has a low coking tendency,and long run lengths can be expected. The results obtained in this study are scaledupto industrial furnaces using COILSIM1D 6;7 , resulting in product yields and runlengths for a typical range of industrial operating conditions.References[1]. Abhari, R., Tomlinson, H. L., Havlik, P. Z., and Jannasch, N. L. USA 2008.[2]. Abhari, R. and Havlik, P. Z. USA Patent 2009/0163744 2009.[3]. Dhuyvetter, I.; Reyniers, M. F.; Froment, G. F.; Marin, G. B.; Viennet, D. Industrial & EngineeringChemistry Research 2001, 40, 4353-4362.[4]. Wang, J. D.; Reyniers, M. F.; Van Geem, K. M.; Marin, G. B. Industrial & Engineering ChemistryResearch 2008, 47.[5]. Van Geem, K. M.; Reyniers, M. F.; Marin, G. B. Oil&Gas Science and technology - Revue del'institut français du pétrole 2008, 63, 79-94.[6]. Van Geem, K. M.; Zhou, Z.; Reyniers, M. F.; Marin, G. B. Effect of Operating Conditions andFeedstock Composition on Run lengths of Steam Cracking Coils. AIChE Spring Meeting: Ethyleneproducers conference. 2009. 30-4-2009.[7]. Van Geem, K. M.; Reyniers, M. F.; Marin, G. B. Taking optimal advantage of feedstock flexibilitywith COILSIM1D. AIChE Spring Meeting: Ethylene producers conference. 2008. 15-4-2008.AcknowledgementsKVG holds a Postdoctoral Fellowship of the Fund for Scientific Research Flanders andBOF tenure track position at Ghent University. SP acknowledges the financial supportprovided by the Methusalem project Multi-scale Modeling and design of chemical Reactionsand Reactors awarded to Prof. Guy B. Marin.31