A New Graphical Method for Calculation of Mass Transfer Time in a Deep Bubble Bed

概要

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A new method for graphical determination of mass transfer (saturation) time in a deep bubble bed (BB) was developed. It is based on the spatial distribution of the local liquid-phase concentrations CL(t) measured by means of an electrical conductivity probe. The raw CL(t) data were obtained in a 0.289-m-ID bubble column equipped with a perforated plate gas distributor (31 holes × ø2 × 10–3 m). Three different clear liquid heights (L0 = 0.56, 1.12 and 1.84 m) were examined. The shallow BB (L0 = 0.56 m) was aerated at superficial gas velocities ug = 0.018, 0.031, and 0.038 m·s–1, respectively. Both medium (L0 = 1.12 m) and deep (L0 = 1.84 m) BBs were aerated only at ug = 0.038 m·s–1 (churn-turbulent flow regime). It was found that the new graphical method is applicable only for a deep BB (L·Dc–1 = 7.3). In that particular case, the difference between the experimental mass transfer time and the graphically determined one is reasonable (the maximum relative error is only 6.9%). Therefore, the new graphical method should be adopted for experimental determination of the mass transfer time in a deep BB. The new method is of practical importance because the industrial bubble columns operate with deep BBs.
社団法人化学工学会の論文
2006-01-01