An industrial scale propylene production via oxidative dehydrogenation of propane (ODHP) inmulti-tubular reactorswasmodeled. Multi-tubular fixed-bed reactor used for ODHP process

employing 10000 of small diameter tubes immersed in a shell through a proper coolant flows. Herein

a theory-based pseudo-homogeneous model to describe the operation of a fixed bed reactor for the ODHP to correspondence olefin over V

2

O

5

/γ-Al

2

O

3

catalyst was presented. Steady state one dimensional model has been developed to identify the operation parameters and to describe the propane and oxygen conversions

gas process and coolant temperatures

as well as other parameters affecting the reactor performance such as pressure. Furthermore

the applied model showed that a double-bed multitubular reactor with intermediate air injection scheme was superior to a single-bed design due to the increasing of propylene selectivity while operating under lower oxygen partial pressures resulting in propane conversion of about 37.3%. The optimized length of the reactor needed to reach 100% conversion of the oxygen was theoretically determined. For the single-bed reactor the optimized length of 11.96 m including 0.5 m of i

nert section at the entrance region and for the double-bed reactor design the optimized lengths of 5.72mfor the first and 7.32mfor the second reactor were calculated. Ultimately

the use of a distributed oxygen feed with limited number of injection points indicated a significant improvement on the reactor performance in terms of propane conversion and propylene selectivity. Besides

this concept could overcome the reactor runaway temperature problem and enabled operations at the wider range of conditions to obtain enhanced propylene production in an industrial scale reactor.