Date of Award


Document Type


Degree Name

Master of Science (MS)


Chemical Engineering


The extent and rates of sulfur and nitrogen oxides 'dry' adsorption by nahcolite and trona were measured. Experiments were conducted by passing simulated flue gas through a fixed bed of test material. Variables considered in the study were particle size, reaction temperature, concentration of sulfur dioxide, and concentration of water vapor in the flue gas.

High reaction rates were noted for the adsorption of sulfur dioxide by nahcolite at reaction temperatures of 400-650° F and for particle diameters of 0.19 mm or less. Based on the adsorption of sulfur dioxide, certain tests resulted in nahcolite utilizations of over 95 pet. Trona also proved to be capable of adsorbing sulfur dioxide. However, reaction rates and utilizations were considerably lower. Neither nahcolite or trona proved to be an effective adsorbent of nitrogen oxide. Water vapor concentrations of 5 to 15 volume percent had no significant effect on reaction rates or utilizations. For the nahcolite-sulfur dioxide reaction both chemical reaction and gas diffusion through the ash layer mechanisms contributed major resistances in controlling the overall reaction rate.

The high reaction rates and utilizations determined for the nahcolitesulfur dioxide reaction indicate that nahcolite has great potential as a sorbent for 'dry' flue gas desulfurization.