Thesis
Analysis of mixing effects on the methanol to olefins reaction
Washington State University
Master of Science (MS), Washington State University
2001
Handle:
https://hdl.handle.net/2376/61
Abstract
An investigation was conducted to examine the effect of reactor mixing states on the methanol-to-olefins (MTO) product distribution when using a ZSM-5 catalyst. A plug flow reactor (PFR) and a continuous stirred tank reactor (CSTR) were used to produce a plug flow and a backmix mixing state under reaction conditions of 450ºC and 8 psig. In order to compare the effect of mixing states at the same conversion and coke levels, spent catalysts from the CSTR were used in the PFR to obtain initial selectivity data. At coke levels from 1.39% to 2.60% and conversions between 36 and 82%, the only direct effects of mixing states were an increase in the saturates selectivity and lack of carbon monoxide in the CSTR. However, the type of coke deposited on the catalysts was dependant on the mixing state and influences the ethylene:propylene ratio at conversions below 80%. The results also indicate that there may be three parallel methanol reactions under these conditions: (1) direct conversion to olefins, (2) conversion to olefins via the formation of dimethyl ether, and (3) decomposition of methanol to carbon monoxide and hydrogen. The decomposition reaction was far more prevalent in the PFR and thus, occurs at higher methanol partial pressures.
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Details
- Title
- Analysis of mixing effects on the methanol to olefins reaction
- Creators
- Christopher Michael Fischer
- Contributors
- William J. Thomson (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Chemical Engineering and Bioengineering, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; Pullman, Wash. :
- Identifiers
- 99900525181501842
- Language
- English
- Resource Type
- Thesis