Oxygen transfer and uptake rates during xanthan gum production
Oxygen transfer and uptake rates during xanthan gum production
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DOI：
10.1016/s0141-0229(00)00272-6
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发表时间：
2000-11-15
影响因子：
3.4
通讯作者：
Santos, VE
中科院分区：
文献类型：
--
作者：
García-Ochoa, F;Castro, EG;Santos, VE
研究了搅拌槽式生物反应器中黄原胶生产过程中的吸氧速率和氧气传质速率。在考虑了空气流速、搅拌速度和表观粘度等变量的情况下，得到了氧气传质系数的经验公式。对发酵过程中的摄氧率变化进行了测量，得到了一个与生物量浓度有关的方程，其中包括总体生长和非生长相关的摄氧量。代谢动力学模型被用来描述黄原胶的生产，包括氧气的传质和摄取速率。结果表明，该模型不仅能较好地描述氧的溶解演化过程，而且能较好地描述氧的溶解演化过程。也影响到黄原胶的生产和承印物的消耗。此外，还研究了几个参数(k(L)a、空气流量和溶解氧)对体系关键化合物演化的影响。模拟结果表明，溶氧浓度的增加有利于黄原胶的产生。(C)2000 Elsevier Science Inc.保留所有权利。
Oxygen uptake rate and oxygen mass transfer rate have been studied during xanthan gum production process in stirred tank bioreactor. Empirical equations for the oxygen mass transfer coefficient have been obtained taking into account several variables such as air how rate, stirrer speed and apparent viscosity. Oxygen uptake rate evolution in the course fermentation has been measured, obtaining an equation as a function of biomass concentration, including overall growth and non growth-associated oxygen uptake. A metabolic kinetic model has been employed for xanthan gum production description including oxygen mass transfer and uptake rates. The results point out that this model is able to describe adequately not only oxygen dissolved evolution, but. also of the production of xanthan and substrate consumption. Also, the influence of several parameters (k(L)a, air flow rate and dissolved oxygen) in the evolution of the key compounds of the system have been studied. The results of the simulation shown that an increasing of dissolved oxygen concentration favor the xanthan gum production. (C) 2000 Elsevier Science Inc. All rights reserved.