Separation of Fischer-Tropsch wax from catalyst by supercritical extraction. Quarterly report, July 1, 1996 - September 30, 1996 Page: 7 of 20
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Detailed Description of Technical Progress
Task I a. Apparatus Modification and Construction
Experimental results that were obtained for the first two binary systems to be
measured indicate that we are obtaining accurate data of high quality. Because we have
found our undergraduate assistants to be most helpful in assisting with the experiments,
we have decided to postpone the automation of our apparatus indefinitely. The limited
funds that we have can be used more effectively elsewhere. Modification of the apparatus
to allow the measurement of alkanes that are solids at ambient conditions has begun and
will continue into the next quarter.
Task lb. Experimental Measurements for n-Hexane/Hexadecane System
Vapor-liquid equilibrium experiments for the n-hexane/hexadecane system have
been completed. Measured compositions and corresponding pressures for the n-
hexane/hexadecane binary at 199.2, 251.7, 299.4, and 349.8 C are given in Table I and
are depicted on a pressure-composition diagram in Figure 1. Mixture critical pressures
and compositions are also reported at the three higher temperatures. For clarity, the
vapor-phase composition of the 199.2 C isotherm is plotted in Figure 2. Both the liquid
and vapor phases have been checked for consistency by the modified Henry's Law and
modified Enhancement Factor methods. These methods were discussed in the first quarter
report for 1996. Figures 3 and 4 depict the modified Henry's Law constant and the
modified Enhancement Factor, respectively, and indicate the high consistency of the
measurements. It should be pointed out that H in Figure 3 is now defined as
H = (P - x2P2't)/xi because the vapor pressure of hexadecane is nontrivial at the measured
temperatures. For the hexane-squalane binary, the second term in the equation was
essentially zero because of squalane's low vapor pressure.
For the liquid phase, the three samples collected at a given temperature and
pressure were typically reproducible to better than 0.5%. In a few cases deviations of up
to 1% were obtained. For the vapor phase, the samples were also typically reproducible
to 0.5%, but deviations between samples of up to 2.5% were occasionally obtained.
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Joyce, P. C.; Thies, M. C.; Sherrard, D.; Biales, J.; Kilpatrick, P. & Roberts, G. Separation of Fischer-Tropsch wax from catalyst by supercritical extraction. Quarterly report, July 1, 1996 - September 30, 1996, report, December 31, 1996; Pittsburgh, Pennsylvania. (https://digital.library.unt.edu/ark:/67531/metadc676287/m1/7/: accessed May 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.