Characteristics of a Rotating Packed Bed

Abstract

The mass transfer (stripping of ethanol) and pressure drop (water−air) of a rotating packed bed were investigated under 13−273 equiv of gravitational force with two packings. The results indicated that the mass-transfer coefficient (K G a) was enhanced due to the centrifugal force as compared to a conventional packed bed. An empirical correlation was also proposed, suggesting that the K G a value depends on the Gr G number to the power of 0.25. As to pressure drop, the gas rate seems to be a more important factor than the liquid rate because of less liquid holdup under centrifugal force. A semiempirical equation was also developed to correlate the pressure drop data with good agreement.

Carbon dioxide absorption in a cross-flow rotating packed bed

“…The original RPB could be operated at the mode of gas-liquid countercurrentflow. The countercurrent-flow RPB has been proved to enhance gas-liquid mass transfer in diverse processes such as distillation (Kelleher and Fair, 1996;Lin et al, 2002;Wang et al, 2008), absorption (Munjal et al, 1989;Kumar and Rao, 1990;Chen and Liu, 2002;Lin et al, , 2004Lin et al, , 2009aLin et al, ,b, 2010Tan and Chen, 2006;Cheng and Tan, 2006;Lin and Jian, 2007;Jassim et al, 2007;Lin and Chien, 2008;Lin and Su, 2008;Cheng et al, 2010), stripping (Keyvani and Gardner, 1989;Singh et al, 1992;Liu et al, 1996;Y.S. Chen et al, 2005a,b;Liu, 2006, 2007), reactive precipitation (Chen et al, 2000(Chen et al, , 2003Wang et al, 2004) and ozone oxidation Y.H.…”

Process intensification: water electrolysis in a centrifugal acceleration field

“…Amongst a variety of methods to facilitate the heat mass and momentum transfers, the centrifugal field method perhaps is the most widely applied technique to processes involving two phases, e.g. absorption, distillation, extraction and phase separation [1][2][3][4][5][6][7][8][9][10]. Generally speaking, the attainment of high transfer coefficients allows us to reduce temperature and concentration differentials and, thus, thermodynamic irreversibilities.…”

Experimental study of a rotating packed bed distillation column

“…The binary interaction coefficients were obtained from Gmehling and Onken (1977). Liu et al (1996) presented an equation for the volumetric overall vapor-side mass transfer coefficient for the process depicted in Figure 2, assuming constant liquid and vapor flow rates and equimolar counterdiffusion mass transfer, and it can be applied to systems where the equilibrium curve is predicted by Henry's law (y*= m x). Since the liquid composition of n-hexane in the reboiler (x A,F ) was kept at 3 mole% and the rotor outlet (x A,1 ) and inlet (x A0) ) liquid composition depended on efficiency (i.e., on the operating conditions), Henry's law not always could be applied.…”