Kinetics and product yield distributions in the CoOMoO3Al2O3 catalysed hydrocracking of Athabasca bitumen
✍ Scribed by Refa Ö. Köseoḡlu; Colin R. Phillips
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 663 KB
- Volume
- 67
- Category
- Article
- ISSN
- 0016-2361
No coin nor oath required. For personal study only.
✦ Synopsis
Hydrocracking of Athabasca bitumen was studied in a batch reactor at 620-693 K and at an initial hydrogen pressure of 7.2 MPa (at 293 K). The reaction products were separated into coke, asphaltenes, resins, aromatics, saturates and gases. The reaction time versus product yield curves were obtained for the above six product groups. Three kinetic models were developed to provide insight into the reaction mechanism. Separated bitumen fractions and lumped fractions (heavy ends = coke + asphaltenes + resins; light oils = saturates + aromatics; asphaltics = coke + asphaltenes; and maltenes = resins + aromatics + saturates) were used as pseudo-components in the kinetic models. The proposed models are: bitumen+gases; heavy ends-+light oils-+gases, asphaltics ++maltenes+gases.
The mathematical model was chosen to be power law because of the complexity of the reaction system. Hydrocracking reactions were assumed to be first order with respect to hydrocarbons and zero order with respect to hydrogen. The reaction rate constants were represented by an Arrhenius type expression. Activation energies and the frequency factors were determined for each reaction model proposed.