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Fermentation 2017, 3(2), 23; doi:10.3390/fermentation3020023

Continuous Ethanol Production from Synthesis Gas by Clostridium ragsdalei in a Trickle-Bed Reactor

Department of Biosystems and Agricultural Engineering, Oklahoma State University, Stillwater, OK 74078, USA
Department of Chemical Engineering, Brigham Young University, Provo, UT 84602, USA
Author to whom correspondence should be addressed.
Academic Editors: Thaddeus Ezeji and Badal C. Saha
Received: 27 March 2017 / Revised: 7 May 2017 / Accepted: 18 May 2017 / Published: 24 May 2017
(This article belongs to the Special Issue Biofuels and Biochemicals Production)
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A trickle-bed reactor (TBR) when operated in a trickle flow regime reduces liquid resistance to mass transfer because a very thin liquid film is in contact with the gas phase and results in improved gas–liquid mass transfer compared to continuous stirred tank reactors (CSTRs). In the present study, continuous syngas fermentation was performed in a 1-L TBR for ethanol production by Clostridium ragsdalei. The effects of dilution and gas flow rates on product formation, productivity, gas uptakes and conversion efficiencies were examined. Results showed that CO and H2 conversion efficiencies reached over 90% when the gas flow rate was maintained between 1.5 and 2.8 standard cubic centimeters per minute (sccm) at a dilution rate of 0.009 h−1. A 4:1 molar ratio of ethanol to acetic acid was achieved in co-current continuous mode with both gas and liquid entered the TBR at the top and exited from the bottom at dilution rates of 0.009 and 0.012 h−1, and gas flow rates from 10.1 to 12.2 sccm and 15.9 to 18.9 sccm, respectively. View Full-Text
Keywords: continuous syngas fermentation; Clostridium ragsdalei; ethanol; trickle bed reactor continuous syngas fermentation; Clostridium ragsdalei; ethanol; trickle bed reactor

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Devarapalli, M.; Lewis, R.S.; Atiyeh, H.K. Continuous Ethanol Production from Synthesis Gas by Clostridium ragsdalei in a Trickle-Bed Reactor. Fermentation 2017, 3, 23.

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