TITLE: Diffusivities of Synthesis Gas and Fischer-Tropsch Products in Slurry Media. Quarterly Report, September-December 1984.

AUTHOR: A. Akgerman.

INST.  AUTHOR: Texas A and M Univ., College Station. Dept. of Chemical Engineering.

SPONSOR: Department of Energy, Washington, DC.

LANGUAGE: English

PUB.  TYPE: Technical Report

PUB.  COUNTRY: United States

SOURCE: Department of Energy [DE],  Jan 85,  33p.

NTIS ORDER NO.: DE85004921/INW

ABSTRACT:

The goal of this research is to develop a fast and accurate method for measuring liquid diffusion coefficients for the Fischer-Tropsch system at temperatures from ambient to 573 K and pressures from ambient to 7 MPa.  The Taylor dispersion technique will be utilized for measuring the diffusivities of carbon monoxide, hydrogen, heptane, octane, nonane, decane, and decanol in molten Fischer-Tropsch wax. The theoretical criteria for measuring diffusivities by the Taylor dispersion method have been given. In addition, the practical departures from an ideal experiment have been discussed; correction for the non-ideal conditions are found in Appendix B (Alizadeh et al., 1980). The effect of varying viscosity on secondary flow effects has been pointed out; it appears that under typical laboratory space limitations, using commercially available tubing, and with diffusivities on the order of 10 exp -9 m exp 2 /s, it will not be possible to completely eliminate these effects. An apparatus for measuring diffusivity at high temperatures and pressures, where data has heretofore been scarce, is presented. With this apparatus rapid measurements may be made, and with the aid of computer control the measurements may be repeated and large volumes of data generated with minimum requirements of the operator. We anticipate our accuracy being between 0.5 and 4%. 20 references, 4 figures. (ERA citation 10:015835)

REPORT  NUMBER: DOE/PC/70032-T1

CONTRACT  NUMBER: AC22-84PC70032