Abstract

The removal of hydrogen sulfide and other sulfur gaseous compounds from the fuel gas of coal gasification plants using iron and zinc oxides has been accomplished with promising success. Associated with this desulfurization process is the problem of regeneration of the metal sulfides formed back to the oxide state for reuse. For the efficient design and optimum operation of process plants, it is imperative that the reaction mechanism for the gas-solid reactions be known as also the gas and solids dispersion and movement in the reactor. In recent years, four mechanistic models have been developed and proposed for this purpose. In section II, models intended for use in connection with the noncatalytic gas-solid reactions are briefly described. They are: shrinking core model, homogeneous model, grain model and pore model. All the four models have been employed to mechanistically describe the desulfurization process in a fixed bed of granular metal oxide. In the light of limited success of these models in their present form to represent the experimental data, a relative assessment of their appropriateness is given in the last section of this report along with some recommendations for future work.

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