Hot Microbubble Air Stripping of Dilute Ethanol-Water Mixtures
Hot Microbubble Air Stripping of Dilute Ethanol-Water Mixtures
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DOI：
10.1021/acs.iecr.0c03250
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发表时间：
2020-10-28
影响因子：
4.2
通讯作者：
Bandulasena, H. C. Hemaka
中科院分区：
文献类型：
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作者：
Calverley, Joseph;Zimmerman, William B.;Bandulasena, H. C. Hemaka
产物抑制和下游分离的成本是使用木质纤维素生物质生产生物乙醇的两个主要障碍。如果能够在不影响发酵过程的情况下连续地从发酵液中去除生物乙醇，则可以在生物乙醇产率和工艺效率方面实现显著的增益。热微泡云所产生的能源效率的手段已被用来去除乙醇从稀乙醇-水混合物（类似于4% [v/v]）保持在60 ℃，和汽提率的关键操作参数的影响进行了研究。热微泡在稀乙醇-水混合物中上升的数值模拟也进行了了解气相内的瞬时浓度。将入口气体温度从90 ° C增加到150 ° C和将单元中的液体高度从50 mm降低到5 mm都增加了乙醇汽提速率。然而，提高气体温度以最大限度地去除乙醇的益处取决于装置中的液体高度。在所有操作条件下，在类似于25分钟的操作内，乙醇浓度降低到低于类似于2% [v/v]，证明了热微泡汽提用于从木质纤维素发酵罐中除去产物的潜力。在发酵罐中有效实施，该技术可以强化生物乙醇生产过程并提高过程经济性。
Product inhibition and the cost of downstream separations are two main barriers in using lignocellulosic biomass for bioethanol production. If bioethanol can be continuously removed from fermentation broth without affecting the fermenta-tion process, significant gains can be achieved with bioethanol yields and process efficiency. Hot microbubble clouds generated by energy efficient means have been used to remove ethanol from dilute ethanol-water mixtures (similar to 4% [v/v]) maintained at 60 degrees C, and the effect of key operating parameters on the stripping rate has been studied. Numerical simulations of a hot microbubble rising in a dilute ethanol-water mixture were also performed to understand the instantaneous concentrations within the gas phase. Increasing the inlet gas temperature from 90 to 150 degrees C and decreasing the liquid height in the unit from 50 to 5 mm both increased the ethanol stripping rate. However, the benefit of increasing the gas temperature for maximum ethanol removal depended on the liquid height in the unit. Under all operating conditions, ethanol concentration was reduced below similar to 2% [v/v] within similar to 25 min of operation, demonstrating the potential of hot microbubble stripping for product removal from lignocellulosic fermenters. Implemented effectively in a fermenter, this technology could intensify the bioethanol production process and improve process economics.