TITLE: Fischer-Tropsch synthesis in supercritical fluids. Quarterly technical progress report, April 1, 1996--June 30, 1996.

AUTHOR: A. Akgerman;   D. B. Bukur.

INST.  AUTHOR: Texas Engineering Experiment Station, College Station.

SPONSOR: Department of Energy, Washington, DC.

LANGUAGE: English

PUB.  TYPE: Technical Report

PUB.  COUNTRY: United States

SOURCE: Department of Energy [DE],  1996,  20p.

NTIS ORDER NO.: DE97050776INW

ABSTRACT:

For the task on diffusion coefficients of F-T products in supercritical fluids, we attempted to find a model for the (beta) parameter to predict the molecular diffusion coefficients to a high degree of accuracy so we may be able to predict both the molecular diffusion coefficient and thus the effective diffusivity a priori. The dependency of solvent/solute interactions on the (beta) parameter was analyzed and a correlation developed to predict the functionality. This allowed us to develop an empirical formula to correlate the molecular diffusion coefficient to ratios of mass, size, and density. Thus finally allowing for supercritical fluid diffusion predictions a priori. Figure 6 shows our predictions of the data available on the self diffusion coefficient of carbon dioxide (Chen, 1983; Takahashi and Iwasaki, 1966) ethylene (Arends et al., 1981; Baker et al., 1984), toluene (Baker et al., 1985) and chlorotrifuoromethane (Harris, 1978). The predictions, with no parameters adjusted from the data, are excellent with an average absolute error of 3.64%.

REPORT  NUMBER: DOE/PC/92545-T3

CONTRACT  NUMBER: FG22-92PC92545