Diffusion Coefficients for Several Dilute Solutes in N-Eicosane, N-Octacosane, and Fischer-Tropsch Wax At 373-533 K

Diffusion Coefficients for Several Dilute Solutes in N-Eicosane, N-Octacosane, and Fischer-Tropsch Wax At 373-533 K - 1988

Section 1 667kb	I	Introduction			1
		A	Fischer-Tropsch Synthesis		1
		B	Overview of Diffusion Research Program		2
		C	Additional Accomplishments		4
		D	General Outline		5
	II	Measurements of Diffusion Coefficients			6
		A	Types of Diffusion Coefficients		6
		B	Techniques for Measuring Diffusion Coefficients		9
		C	Taylor Dispersion		10
	III	Previous Experimental Work			16
	IV	Theory of Predicting Diffusion in Liquids			22
		A	Hydrodynamic Theory		22
		B	Activation Theory		23
		C	Free Volume Theory		24
		D	Kinetic Theory		25
		E	Correlation of Experimental Data with the RHS Theory		31
Section 2 927kb	V	Apparatus and Procedure			35
		A	Original Apparatus and Procedure		35
		B	Potential Sources of Error		39
		C	Density From Taylor Dispersion		41
		D	Modifications to the Original Apparatus		42
		E	Special Considerations with Molten Solvents		48
		F	Composition of Solutes and Solvents		49
		G	Experimental Conditions		51
	VI	Taylor Dispersion Model			52
		A	Mathematical Description of Model		52
		B	Handling of Raw Data		55
		C	Model Validation Using Generated Data		56
		D	Model Validation Using Experimental Data		58
		E	Sensitivity Analyses		64
		F	Comparison to Other Analysis Methods		68
		G	Comparison of Model Results to Literature Values		71
		H	Selection of Operating Flow Rate		72
			1	Flow Criteria Based on Limitations of Taylor's Solution	73
			2	Laminar Flow Criterion	75
			3	Coiling Effects	75
Section 3 815kb	VII	Results and Discussion			79
		A	Diffusion Coefficients Measured During This Work		79
		B	Correction of Previously Reported Values		90
		C	Solvent Density		91
		D	Rough Hard Sphere Correlation		93
		E	Validation of Correlation Using Literature Data		107
		F	Predicting Diffusion Coefficients in Fischer-Tropsch Wax		111
Section 4 1050kb	VIII	Conclusions			119
		Recommendations for Future Work			122
		Literature Cited			124
		Appendix A: Fortran Code for Taylor Dispersion Model			130
		Appendix B: Example Output from Taylor Dispersion Model			145
		B.1	Carbon Dioxide in N-Eicosane at 222º C		146
		B.2.	N-Dodecane in N-Eicosane at 222º C		152
		B.3.	N-Octane in N-Octacosane at 100º C		159
		Appendix C: Corrected Diffusion Coefficients in the Solvents N-Heptane, N-Dodecan, and N-Hexadecane			167
		Appendix D: Tabulation of Literature Diffusion Coefficients Versus the Predictions of Equation 7.8			170
		Vita			176