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| Titel: |
MATHEMATICAL MODEL FOR LIQUID-LIQUID PHASE-TRANSFER CATALYSIS |
| Auteur: |
Yang, Hung-Ming |
| Verschenen in: |
Chemical engineering communications |
| Paginering: | Jaargang 179 (2000) nr. 1 pagina's 117-132 |
| Jaar: |
2000-05-01 |
| Inhoud: |
A mathematical model for liquid-liquid phase transfer catalysis concerning diffusion and reaction in a single organic droplet was developed. The reversibility of reaction in the aqueous phase was taken into account to investigate its effect on the role of phase transfer catalytic intermediate. The modified Hatta number (φ) which characterizes the phenomena of diffusion within droplets and mass Biot number of the active intermediate reflecting the importance of interfacial mass transfer resistance, were defined to interpret their effects on the organic reaction rate. Comparisons of the behaviors of active intermediate in the organic droplets for reversible and irreversible aqueous reactions were proposed. From the simulation results, the reversibility of the aqueous phase reaction affects the overall reactivity not much except for a lower distribution coefficient of the intermediate. The quantity of the active intermediate in the organic phase slightly increases as decreasing the equilibrium constant of the aqueous reaction. The published experimental data were employed to demonstrate the present model successfully. From the present study, the behaviors of diffusion and reaction within liquid droplets in phase transfer catalysis can be understood and are useful for proper reactor design. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 7 van 13 gevonden artikelen
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