02291nmc a2200325 4500 20260520005651.0 260224s xxu CD W938 1 0013960 WPC (16th.) Potential and limitations of octane-boosting through isomerization of C7 alkanes over bifunctional zeolites 12/09/06 ; 26/08/2003 12 p. Resumen del autor, extraído del trabajo. The possibility of isomerizing the C7 cut obtained from atmospheric distillation of crude oil as an alternative to its aromatization is elucidated in model compound studies. It is shown that, over selected bifunctional zeolite and zeolite-like catalysts, n-heptane can be isomerized up to medium conversions without significant hydrocracking as consecutive reaction. However, the achieved degree of branching of the isomerization product and, therefore, its research octane number (RON), is much too low. Therefore, process flow schemes are discussed in which the unbranched and the only slightly branched isomers are separated from the di- and tribranched isoheptanes and recycled to the isomerization reactor. In principle, this allows to obtain a product consisting almost exclusively of highly branched heptanes. From model calculations it can be deduced that such a mixture would possess research octane numbers above 86. It is, moreover, shown that the desired molecular sieve separation of n-heptane and the monomethyl hexanes from their multiply branched isomers can be achieved using medium pore zeolites, e.g., silicalite-1 as adsorbent. v. 3, p. 27 CONGTP Ernst, S. 9859 Bischof, C. 9860 Hartmann, M. 9861 Weitkamp, J. 9862 University of Kaiserslautern. Department of Chemistry 9863 University of Stuttgart 9864 World Petroleum Congress (16th. : 2000 jun. 11-15 : Calgary, Alberta, Canada) 34 Bischof, C. 9860 Hartmann, M. 9861 Weitkamp, J. 9862 University of Kaiserslautern. Department of Chemistry 9863 University of Stuttgart 9864 Ernst, S. 9859 133554 133554 0 0 0 0 204473 BAAB BAAB CD W938 1 0013960 2026-03-04 200006047 0 CD W938 1 0013960 200006047 2026-03-04 14:03:22 2026-03-04 ARCHIVO