III International Conference

PP-I-73lower than 450 °C with practically full conversion of sulfur in H 2 S. However because ofexistence of side reactions (polymerization and interaction of styrene with sulfur) yield ofstyrene falls at the temperatures lower than 500 o C and at the contact times greater than 1.5 s.It has been established that at the ratio S 1 /C 4 H 10 > 0.7 the formation of sulfurorganiccompounds takes place. The optimal conditions of catalytic dehydrogenation of ethylbenzeneby sulfur vapor with preferable formation of styrene have been determined. The resultsobtained at 550 °C and ethylbenzene concentration ≤ 40 % vol. demonstrate attainability ofhigh selectivity for styrene (95-99 %) at a high conversion of ethylbenzene (65-70 %).References1. Reactions of sulfur with organic compounds, Ed. M.G.Voronkov // Novosibirsk, “Nauka”, 1979,P. 9-108 (in Russian).2. O.N. Kovalenko, N.N. Kundo, V.M. Novopashina, P.N. Kalinkin, Kin.Kat., 2001, v. 42, No. 5,724-729 (Non-stationary phenomena at low-temperature gas-phase catalytic oxidation of H 2 S byoxygen).138