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Modeling of ethanol separation from continuous solid‐state fermentation coupled with online separation by CO2 gas stripping and heat pump technology

Author:
Chen, Hong‐Zhang, He, Qin, Ding, Wen‐Yong
Source:
Journal of chemical technology and biotechnology 2015 v.90 no.10 pp. 1897-1905
ISSN:
0268-2575
Subject:
bioreactors, carbon dioxide, correlation, equations, ethanol, gases, heat pumps, models, solid state fermentation
Abstract:
BACKGROUND: A self‐made continuous solid‐state fermentation bioreactor coupled with gas stripping and heat pump technology apparently improved the ethanol yield. The confirmation of ethanol separation ability and establishment of a separation model for the equipment was crucial before use and scale‐up. RESULTS: The data calculated by the model was in good agreement with the experimental results, and the correlation coefficient of the fitting equation reached 0.928. The corresponding transfer coefficients of ethanol and water were 0.591 and 0.138 kg m⁻³ h⁻¹ kPa⁻¹, respectively, calculated by the model, and the equilibrium constant of ethanol was 48.784 kPa in the reported system. The distribution law of ethanol and water throughout the bioreactor showed that the partial pressures of ethanol and water in the circulation gas phase increased with the enhanced height of tower. Further study of the effect of circulation gas flow rate in the ethanol separation process showed that an appropriate gas flow should be greater than 15 kg h⁻¹. CONCLUSIONS: A preliminary ethanol separation model was established successfully for the self‐made continuous solid‐state fermentation bioreactor coupled with gas stripping and heat pump technology. © 2014 Society of Chemical Industry
Agid:
4084840