Operating a foam fractionating column in simple mode

This paper discusses the correct way of operating a foam fractionating column strictly in simple mode. The system chosen was zinc and sodium lauryl sulphate. It was experimentally noticed that if the surface excess was measured at random operating conditions the column was producing inconsistent data, violating the conditions of simple mode operation. After thorough examination it was determined that the height of foam-liquid interface, air flow rate and bubble diameter must be mutually adjusted in order to bring the column close to its simple-mode operation. The results were compared with those of previous investigators, who used the similar apparatus, and it was concluded that the experimental method illustrated in this paper furnished more reliable data of simple-mode operation.