Investigation of mass transfer phenomena in coal liquefaction: assessment of resistances and reactor types
An assessment of the mass transfer phenomena involved in the coal liquefaction process is made based on the analysis of pilot plant data, model compound studies, and coal liquefaction experiments. The relative gas-liquid mass transfer coefficients were examined for tubing bomb microreactors (TBMR), stirred autoclaves, and bubble columns. A well defined chemical system, the oxidation of sodium sulfite, was utilized for the comparison of reactor types. The gas-liquid mass transfer coefficients an interfacial areas were determined for the TBMR and stirred autoclave. These results were compared with the literature values for the bubble columns. Of the above three reactors, the tubing bomb microreactor was found to exhibit the highest gas-liquid volumetric mass transfer coefficients. The effect of solids on gas-liquid mass transfer rate was studied in the TBMR and stirred autoclave. The effect of solids was a function of particle size, agitation intensity, and the reactor type. The overall hydrogen consumption rate was used in assessing the contribution of kinetic, gas film, gas-liquid, and liquid-solid resistances. Coal liquefaction was found to operate predominately in the kinetic regime. Catalytic and thermal liquefaction of coal was carried out to determine the nature and extent of pore diffusion limitations in various stages of coal liquefaction.
- OSTI ID:
- 6335692
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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