Separation of Fischer-Tropsch wax from catalyst by supercritical extraction. Quarterly report, July 1, 1996 - September 30, 1996 Page: 6 of 20
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Technical Objectives
The objective of this research project is to evaluate the potential of SCF extraction
for separating the catalyst slurry of a Fischer-Tropsch (F-T) slurry bubble column (SBC)
reactor into two fractions: (1) a catalyst-free wax containing less than 10 ppm particulate
matter and (2) a concentrated catalyst slurry that is ready for recycle or regeneration. The
wax will be extracted with a hydrocarbon solvent that has a critical temperature near the
operating temperature of the SBC reactor, i.e., 200-300 0C. Initial work is being
performed using n-hexane as the solvent. The success of the project depends on two
major factors. First, the supercritical solvent must be able to dissolve the F-T wax;
furthermore, this must be accomplished without entraining the solid catalyst. Second, the
extraction must be controlled so as not to favor the removal of the low molecular weight
wax compounds, i.e., a constant carbon-number distribution of the alkanes in the wax
slurry must be maintained at steady-state column operation.
To implement our objectives, the following task structure is being implemented:
Task 1: Equilibrium Solubility Measurements
a. apparatus modification and construction.
b. experimental measurement of selected model systems.
c. catalyst/wax separation studies.
Task 2: Thermodynamic Modeling
a. programming and testing of SAFT equation for nonassociating systems.
b. programming and testing of SAFT equation for associating systems.
c. modeling measured results with the SAFT equation.
d. pure component and mixture SAFT parameter determination for selected model
systems.
Task 3: Process Design Studies
a. integration of our SAFT program into a process simulation package.
b. process configuration studies using above simulation package.4
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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/m1/6/?rotate=270: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.