Packing Characteristics for Mass Transfer in a Rotating Packed Bed

Abstract

This work investigated the mass transfer of a rotating packed bed (RPB) with emphasis on the effects of the packing's size, shape, material, and surface property. Experimental results show that there is no obvious relationship between a t and k L a. Among the various shapes of the packings, the mass transfer coefficients of Raschig rings and Intalox saddles are lower than those of the others, while the k L a of the wire meshes is the highest. As to materials, the mass transfer coefficients are similar for acrylic, glass, ceramic, and stainless steel beads. Besides, the k L a values of the hydrophobically treated packings are 8−27% lower than those of the original glass and ceramic packings. A modified correlation of k L a, which includes the effects of various packings, is proposed based on our RPB experimental results. Further, this correlation can also reasonably estimate most of the k L a data in the Higee literature.

Gas‐phase mass transfer characteristics in a counter airflow shear rotating packed bed

“…The terms k y a e , a e , and k y are assumed to be composed of the following dimensionless number parameters: Re G , We L , and Ga. The correlations for counter/co-rotation in the CAS-RPB and SP-RPB are obtained in Tables 2 and 3, respectively, in which the applicable conditions are that gas flow rate ¼ 10-30 m 3 The correlative expressions for k y a e , a e , and k y in the CAS-RPB and SP-RPB are obtained with MATLAB software. The correlation coefficients from the regression analysis are all above 0.99, and the maximum errors of k y a e , a e , and k y between the calculated values and experimental results are all < 15 %, as shown in Figure 8, showing close agreement with each other.…”

“…In deriving Equation (8), the interfacial concentration of NH 3 , y e , is taken to be zero as NH 3 instantaneously dissolves in H 2 O.…”

“…To improve the mass transfer efficiency, the rotating packed bed (RPB) was proposed as a novel gas-liquid contactor by Ramshaw and Mallison, [1] which generates a centrifugal force up to several hundred times greater than gravitational force. [2][3][4] Liquid-phase mass transfer in RPBs has been investigated extensively, and a large improvement in liquid-phase mass transfer coefficient is obtained in RPBs compared with that of conventional packed beds. [5][6][7][8][9] However, there is no improvement in gas-phase mass transfer coefficient in RPBs, which was reported by many researchers.…”

“…After completing the absorption of CO 2 into the aqueous NaOH solution, the CO 2 cylinder is closed and the NH 3 cylinder is opened for the absorption of NH 3 into H 2 O. A REA CO 2 analyzer is used to analyze the CO 2 concentration of inlet and exit gas, and a GT-2000 NH 3 analyzer is used to analyze the NH 3 concentration of inlet and exit gas. In this experiment, the NH 3 concentration of inlet gas was maintained at 600 mg Á m À3 and the CO 2 concentration of inlet gas was maintained at 12 000 mg Á m À3 .…”

Experimental study of a rotating packed bed distillation column

“…Also, heat-sensitive materials can be processed effectively, so RPBs have been applied to processes such as ozone oxidation and synthesis of drug and inorganic nanoparticles (Chandra et al, 2005;Chen et al, 2005a,b;Chen et al, 2006;Yang et al, 2006).…”