Mass transfer and hydrodynamic characteristics of a high aspect ratio self-ingesting reactor for gas–liquid operations
Mass transfer and hydrodynamic characteristics of a high aspect ratio self-ingesting reactor for gas–liquid operations
复制标题
DOI：
10.1016/j.ces.2006.11.040
复制
发表时间：
2007-03
影响因子：
4.7
通讯作者：
F. Scargiali;R. Russo;F. Grisafi;A. Brucato
中科院分区：
文献类型：
--
作者：
F. Scargiali;R. Russo;F. Grisafi;A. Brucato
本文报道了气液自激搅拌反应器在聚结和非聚结两种情况下的传质性能。该容器的特征是高纵横比和相当窄的多叶轮导流管，气相通过该导流管被吸入并向下引导至容器底部，在容器底部，气相被精细地分散到在容器的环形部分中上升的液体中。比较由几个变种的动态方法，其中纯氧吸收在先前脱气的液相中确定的KLa值之间。结果表明，与最后一种方法得到的气液传质系数值显着大于与所有其他技术，其中氮气最初溶解在液相中测量。这种差异背后的可能原因进行了讨论。最后，将所研究的气体诱导接触器的气液传质性能与其它自诱导/诱导装置的文献数据进行了比较。比较结果鼓励进一步发展的调查仪器。
The mass transfer performance of a gas–liquid self-ingesting stirred reactor is reported both for coalescing and non-coalescing systems. The vessel features are a high aspect ratio and a rather narrow multiple-impeller draft tube, through which the gas phase is ingested and led down to the vessel bottom, where it is finely dispersed into the liquid rising in the annular portion of the vessel. Comparison is made between kLa values determined by several variants of the dynamic method, among which pure oxygen absorption in a previously de-gassed liquid phase. Results show that the gas–liquid mass transfer coefficient values obtained with the last approach are remarkably larger than those measured with all other techniques in which nitrogen is initially dissolved in the liquid phase. Possible reasons behind this discrepancy are discussed. The gas–liquid mass transfer performance of the investigated gas inducing contactor is finally compared with literature data on other self-inducing/ingesting devices. Comparison results encourage further development of the investigated apparatus.