Rauf K. Babayev,¹ Narmina T. Aliyeva,¹ Kamala S. Abdullayeva,¹ Soltan A. Aliyev<sup>1

1</sup>Azerbaijan State University of Oil and Industry (Azerbaijan, Republic of)

Abstract

The results of a systematic study of the oxidative dehydrogenation process of n-octane (C₈H₁₈) in a fluidized bed reactor with a vanadium catalyst are presented. The influence of the main technological parameters of the process — temperature (400-600°C), molar ratio of n-octane/O₂ (1:0.3 - 1:0.7), and contact time (0.5-3.0 s) — on paraffin conversion and olefin formation selectivity was studied. The kinetic parameters of the process were determined: reaction orders with respect to n-octane (α = 0.8) and oxygen (β = 0.5), activation energy of the target reaction (85 ± 5 kJ/mol). It was established that optimal process conditions — temperature of 500-550°C and n-octane/O₂ ratio of 1:0.5 — provide a conversion of 65-78% with a selectivity to octenes of 80-85%. It was shown that the use of a fluidized bed reactor ensures efficient heat exchange, uniform temperature distribution, and high process productivity. A method for catalyst regeneration by oxidative coke burning was developed, allowing the restoration of activity to 95-98% of the initial level. The obtained results can be used for the development of an industrial process for octene production — an important feedstock for the production of synthetic detergents and plasticizers.