Connection Between Liquid Distribution and Gas-Liquid Mass Transfer in Monolithic Bed

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• 作者：Min  ; XU ; Hui  ; LIU  ; ;   ; ^{hliu@mail.buct.edu.cn} ; Chengyue  ; LI ; Yuan  ; ZHOU ; Shengfu  ; JI
• 关键词：monoliths ; flow distribution ; gas-liquid mass transfer ; Taylor flow ; single-channel
• 刊名：Chinese Journal of Chemical Engineering
• 出版年：2011
• 出版时间：October 2011
• 年：2011
• 卷：19
• 期：5
• 页码：738-746
• 全文大小：370 K

文摘

With a particular focus on the connection between liquid flow distribution and gas-liquid mass transfer in monolithic beds in the Taylor flow regime, hydrodynamic and gas-liquid mass transfer experiments were carried out in a column with a monolithic bed of cell density of 50 cpsi with two different distributors (nozzle and packed bed distributors). Liquid saturation in individual channels was measured by using self-made micro-conductivity probes. A mal-distribution factor was used to evaluate uniform degree of phase distribution in monoliths. Overall bed pressure drop and mass transfer coefficients were measured. For liquid flow distribution and gas-liquid mass transfer, it is found that the superficial liquid velocity is a crucial factor and the packed bed distributor is better than the nozzle distributor. A semi-theoretical analysis using single channel models shows that the packed bed distributor always yields shorter and uniformly distributed liquid slugs compared to the nozzle distributor, which in turn ensures a better mass transfer performance. A bed scale mass transfer model is proposed by employing the single channel models in individual channels and incorporating effects of non-uniform liquid distribution along the bed cross-section. The model predicts the overall gas-liquid mass transfer coefficient with a relative error within ¡À30 % .