A Rate Approach to Design of Perforated-Plate Extraction Columns

Abstract

An attempt is made to integrate some of the many and diverse studies on droplet phenomena into a coherent design procedure for perforated-plate liquid extraction columns. Equations describing mass transfer during droplet formation, rise, and coalescence, and incorporating relevant hydrodynamics, are used to locate a pseudoequilibrium curve. This curve is used in place of the true equilibrium relationship when stepping off the necessary number of actual stages between the pseudoequilibrium and operating curves on the x-y diagram. The provisional procedure is written in Fortran IV computer language and the printout gives the number of real plates required for a prescribed separation, the number of perforations per plate, the column diameter, and the cross sectional area of the downcomers. Predictions are compared with all appropriate published values and agreement with fully eligible data (group A) is substantial.

Dispersed phase mass transfer during drop formation under jetting conditions

“…The design procedure recently published by Skelland and Conger (1973) for liquid-liquid extraction in perforated plate columns uses a phenomenological approach, and its continued development should be useful both for the design of new processes and for predicting the results of modifying the operation of existing equipment.…”

“…From this collection, Skelland and Conger (1973) used the following in their design procedure for nonjetting conditions.…”

Effects of interaction between circulating or oscillating droplets on drop formation, free fall, and mass transfer

“…The work should aid in applying the design procedure for perforated plate extraction columns presented by Skelland and Conger ( 1973) to commercial systems, where dispersed phase holdups are quite high. 'Present address: Amoco Oil Company, 2401 5th Avenue South, Texas City, Texas 77590, USA.…”

Rate‐based nonisothermal LLX model and its experimental validation

“…It has been observed that Skelland and Conger (1973) (for k ij of stagnant drops), Wesselingh and Krishna (1990) (for D ij ), and Siddiqi and Lucas (1986) (for D ij 0 ) as suggested by Sanpui and Khanna (2002) are the best combination for the TAW and MAW systems.…”

“…(B5) Skelland and Conger (1973) proposed the expressions for slip velocity, formation, and rise time as given below: Slip velocity:…”