Correlation of slurry reactor Fischer-Tropsch yield data |
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Authors: | Joseph M Fox III Samuel S Tam |
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Affiliation: | (1) Bechtel Consultant, PO Box 3965, 94119-3965 San Francisco, CA, USA;(2) Bechtel Corporation, PO Box 3965, 94119-3965 San Francisco, CA, USA |
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Abstract: | First stage slurry reactor Fischer-Tropsch (FT) yield data from Mobil's two-step pilot plant operations for the DOE have been correlated using a modified Schulz-Flory approach but allowing for changes in the probability of chain growth, , at key product molecular weights. Triple values of are invoked to explain (1) the high methane yield and (2) the very broad molecular weight distribution of the wax fraction, as compared to (3) moderate values of 2 of between 0.79 and 0.85 for the C2–C20 hydrocarbons. Over this range, wax yields from 10 to 76 wt% are accommodated, at values of 3 from 0.90 to 0.98. The second break in the yield-molecular weight curve occurs at the carbon number where most of the component remains in the reactor as liquid rather than leaving as vapor product. It is assumed that this is a function of vapor-liquid equilibrium. The correlation has proven useful in developing a computer model of the FT synthesis loop which is part of a baseline design and economic study for DOE/PETC. |
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Keywords: | Fischer-Tropsch Schulz-Flory yield model slurry reactor process simulation vapor-liquid equilibrium correlation pilot plant data |
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