Fischer-Tropsch synthesis from a low H/sub 2/:CO gas in a dry fluidized-bed system. Volume 2. Development of microreactor systems for unsteady-state Fischer-Tropsch synthesis. Final technical report. [408 references]
Vibrofluidized microreactor systems have been developed for studies of unsteady-state Fischer-Tropsch synthesis. This development is aimed at preventing carbon deposition on a fused-iron catalyst in a novel reactor called the ''heat tray.'' This reactor involves a supernatant gas flowing over a shallow fluidized bed of catalyst particles. Three systems were built: (1) a vibrofluidized-bed microreactor system for obtaining baseline carbon deposition information under industrially important reaction conditions; (2) a sliding-plug vibrofluidized-bed microreactor system for rapid switching of feed gases in the F-T synthesis; and (3) a cold-flow microreactor model for studying the gas mixing characteristics of the sliding-plug vibrofluidized-bed microreactor. The results show that catalyst defluidization occurred under steady-state synthesis conditions below 395 C using a feed gas of H/sub 2//CO ratio of 2:1 or less. Above 395 C, the probability of hydrocarbon chain growth (..cap alpha.. < 0.50 to prevent accumulation of high-molecular-weight species that cause defluidization. Carbon deposition was rapid above 395 C when a feed gas of H/sub 2//CO ratio of 2:1 or less was used. Cold-flow microreactor model studies show that rapid (on the order of seconds), quantitative switching of feed gases over a vibrofluidized bed of catalyst could be achieved. Vibrofluidization of the catalyst bed induced little backmixing of feed gas over the investigated flow-rate range of 417 to 1650 actual mm/sup 3//s. Further, cold-flow microreactor model studies showed intense solid mixing when a bed of fused-iron catalyst (150 to 300 microns) was vibrofluidized at 24 cycles per second with a peak-to-peak amplitude of 4 mm. The development of the microreactor systems provided an easy way of accurately determining integral fluid-bed kinetics in a laboratory reactor. 408 refs., 156 figs., 27 tabs.
- Research Organization:
- Virginia Polytechnic Inst. and State Univ., Blacksburg (USA). Dept. of Chemical Engineering
- DOE Contract Number:
- FG22-82PC50791
- OSTI ID:
- 7156480
- Report Number(s):
- DOE/PC/50791-T4; ON: DE87000287
- Resource Relation:
- Other Information: Microfiche only, copy does not permit paper copy reproduction
- Country of Publication:
- United States
- Language:
- English
Similar Records
Fischer-Tropsch synthesis from a low H/sub 2/:CO gas in a dry fluidized-bed system. Technical progress report, July 1, 1983-April 30, 1984
Fischer-Tropsch synthesis from a low H/sub 2/:CO gas in a dry fluidized-bed system. Technical progress report, September 1, 1982-March 31, 1983. [Large number of references]
Related Subjects
10 SYNTHETIC FUELS
CARBON
DEPOSITION
CATALYSTS
DEACTIVATION
CHEMICAL REACTORS
DESIGN
FISCHER-TROPSCH SYNTHESIS
HYDROCARBONS
SYNTHESIS
IRON
CATALYTIC EFFECTS
BENCH-SCALE EXPERIMENTS
CARBON MONOXIDE
EXPERIMENTAL DATA
FLOWSHEETS
FLUIDIZED BEDS
GAS CHROMATOGRAPHY
HIGH TEMPERATURE
HYDROGEN
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMATOGRAPHY
DATA
DIAGRAMS
ELEMENTS
INFORMATION
METALS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SEPARATION PROCESSES
TRANSITION ELEMENTS
010408* - Coal
Lignite
& Peat- C1 Processes- (1987-)
090121 - Hydrocarbon Fuels- Chemical Synthesis- (1976-1989)