Theoretical Enhancement Factor Research Articles

Kinetics of absorptions of lean sulfur dioxide into aqueous slurries of calcium carbonate and magnesium hydroxide

The process of the absorption of sulfur dioxide into an aqueous slurry of calcium carbonate or magnesium hydroxide was theoretically analyzed according to the two-reaction-plane model incorporating the solid dissolution promoted by the reactions with absorbed sulfur dioxide in the liquid film. Theoretical enhancement factors compared well with the experimental data using a stirred tank absorber with a plane gas—liquid interface at 25°C. The concentrations of the accumulated species in the bulk liquid phase (bicarbonate ion for the calcium carbonate slurry and sulfite ion for the magnesium hydroxide slurry) which substantially control the absorption rates, were assesed by comparing experimental enhancement factors with the theoretical predictions.

Absorption of Sulfur Dioxide in Aqueous Slurries of Sparingly Soluble Fine Particles

The process of absorption of sulfur dioxide in aqueous slurries of calcium carbonate or magnesium hydroxide was analyzed theoretically according to the two-reaction-planes model. Theoretical enhancement factors were compared with experimental data for the absorption using a stirred-tank absorber with a plane gas—liquid interface at 25 °C. The experimental data for the enhancement factor were interpreted qualitatively by considering the additional reaction of sulfur dioxide with the species accumulated in the bulk liquid phase (bicarbonate ions for the calcium carbonate slurry and sulfite ions for the magnesium hydroxide slurry).

Absorption of sulfur dioxide into aqueous slurries of sparingly soluble fine particles

The process of the absorption of sulfur dioxide into aqueous slurries of calcium carbonate or magnesium hydroxide was theoretically analyzed according to the two-reaction-plane model. Theoretical enhancement factors were compared with experimental data for the absorption using a stirred tank absorber with a plane gas-liquid interface at 25°C. The experimental data for the enhancement factor were qualitatively interpreted by considering the extra reaction of sulfur dioxide with the accumulated species in the bulk liquid phase (bicarbonate ion for the calcium carbonate slurry and sulfite ion for the magnesium hydroxide slurry)

Optical Means for Enhancing the Sensitivity of a Tri-Alkali Photocathode

With conventional transmissive photocathodes, an appreciable amount of the incident light passes through the photocathode layer without contributing to the electron emission. It is possible, at certain predetermined wavelengths, to reduce these light losses and thereby to increase the quantum efficiency of the cathode by making it part of a reflection interference filter. In practice, this involves the deposition of the photocathode on a dielectric which is, in turn, deposited on an opaque mirror. The thin-film optics of the above arrangement has been considered theoretically, and the possible increase in light absorption, and hence in electron emission, could be predicted. Evaluation of actual tri-alkali (S-20) photocathodes constructed along the above lines agree with, and at times even exceed, the theoretical enhancement factor of about three to five, thus establishing the practicability of the method considered.