Oxidation of butene to maleic anhydride--2. effect of physical transport on reactor performance

Journal Article · Fri Dec 01 04:00:00 EST 1978 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(78)90224-5· OSTI ID:6922584

Varma, R L; Saraf, D N

The effects of heat and mass transfer resistance on the catalyst effectiveness factor and selectivity were evaluated for the multiple reaction system of air oxidation of butene on vanadyl phosphate on the basis of an isothermal catalyst pellet model. The results showed significant intraparicle concentration gradients but only interphase concentration and temperature gradients at 0.003 atm partial pressure of each component; for this catalyst at Vertical Bar3; 650/sup 0/K, the reaction was kinetically controlled. It was also shown that transport resistance reduces the instantaneous selectivity for butadiene and improves the selectivity for maleic anhydride. The pellet model was combined with the basic conservation equations for the fluid phase; the results showed good agreement with experimental values for butene conversion and maleic anhydride yields at 350/sup 0/ and 390/sup 0/C, except for low effective diffusivities. Calculations performed with the heterogeneous model for nonisothermal operation showed hot spots that were highly sensitive to the chosen values of the effective diffusivity.

• Research Organization: Indian Inst. of Technol., Kanpur
• OSTI ID: 6922584
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 55:3; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALKENES
BUTENES
CATALYSTS
CHEMICAL REACTIONS
CHEMICAL REACTORS
ENERGY TRANSFER
HEAT TRANSFER
HYDROCARBONS
KINETICS
LOW PRESSURE
MASS TRANSFER
MATHEMATICAL MODELS
ORGANIC COMPOUNDS
OXIDATION
PARTIAL PRESSURE
PARTICLE MODELS
PERFORMANCE
REACTION KINETICS
TEMPERATURE GRADIENTS