Intensification of mass transfer in liquid fluidized beds with inert particles

Abstract

The influence of inert particles on liquid/solid mass transfer is studied in fluidized beds by using a binary-mixture of solids of differing size and density. The addition of inert particles of higher density and smaller diameter, e.g. glass beads, exerts remarkable effects on mass transfer coefficients in comparison to that of mono-component active particles at the same liquid velocity. The extent of the effect on liquid-solid mass transfer coefficients increases with an increasing fraction of the small inert particles in the mixture. The liquid-solid mass transfer coefficients for binary-mixtures are well correlated in terms of dimensionless groups and the voidage parameter.

Heavy Metal Adsorption to a Chelating Resin in a Binary Solid Fluidized Bed

“…( 16) and Eq. 17), respectively. The number of transfer units for the adsorption of copper ion on chelating resin (experiment NOR5) is found to be respectively 145 for DaI kf, and 16 for DaI kL .…”

“…According to our previous work [17], the addition of inert particles of heavier density and smaller diameter could be used to increase the film mass transfer coefficient. In this work, this technique is applied to the aforementioned system.…”

Derivation and Application of a Generalized Correlation for Mass Transfer in Packed Beds

“…Dilution of packed beds is applied in laboratory and industrial scale reactors, especially in order to reduce the formation of hot spots for highly exothermic reactions [29,30]. It also leads to an increase of the apparent Sherwood number [31,32]. It is worth noting that the aforementioned model of Scala [20] predicts an opposing trend at intermediate Reynolds numbers.…”

Solid-liquid circulating fluidized bed: a way forward

“…The correlation constants (A and c) have been obtained by least squares regression by using the experimental data set of previous investigators (McCune and Wilhelm 1949, Evans and Gerald 1953, Couderc et al 1972, Damronglerd et al 1975, Upadhyay and Tripathi 1975, Koloini et al 1977, Rahman and Streat 1981a, Shen et al 1985, Livingston and Noble 1993, Yang and Renken 1998, Kalaga et al 2014. The following expression has been obtained using 480 data points:…”