Effect of antifoam addition on gas-liquid mass transfer in stirred fermenters
Effect of antifoam addition on gas-liquid mass transfer in stirred fermenters
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DOI：
10.1007/s004490050576
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发表时间：
1999-02-01
期刊：
影响因子：
--
通讯作者：
Alves, SS
中科院分区：
文献类型：
--
作者：
Morao, A;Maia, CI;Alves, SS
研究了三种常用消泡剂（聚丙二醇、有机硅和大豆油）对搅拌槽内气液传质的影响。考察了消泡剂浓度、离子强度、粘度、搅拌速度和气体流量等因素的影响。结果发现，消泡剂在低浓度下的加入显着降低气液体积传质系数，k（L）a，为三个消泡剂测试。虽然主要影响膜系数k（L），但也检测到对比表面积a的一些影响。结果发现，粘度和消泡剂添加的影响是不累积的：每一个倾向于削弱对方的传质效果。在所研究的浓度范围内，对于硅酮和大豆油，但不对于PPG，存在消泡剂浓度，高于该消泡剂浓度，进一步添加消泡剂开始改善k（L）a。
The influence of three well-known antifoaming agents (polypropylene glycol, silicone and soybean oil) on gas-liquid mass transfer in stirred tanks is studied, both in model and in fermentation media. The effect of antifoam concentration, ionic strength, viscosity, agitation speed and gas flow rate are investigated. It is found that antifoam addition at low concentrations markedly decreases the gas-liquid volumetric mass transfer coefficient, k(L)a, for the three antifoam agents tested. Although the major effect is on the film coefficient k(L), some effect is also detected on the specific area, a. It is found that the influence of viscosity and antifoam addition are not cumulative: each tends to attenuate the other's effect on mass transfer. Both for silicone and for soybean oil, but not for PPG in the concentration range studied, there is an antifoam concentration above which further antifoam addition starts to improve k(L)a.