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Processes 2019, 7(3), 137; https://doi.org/10.3390/pr7030137

Study on Mass Transfer Kinetics of Sugar Extraction from Sweet Sorghum Biomass via Diffusion Process and Ethanol Yield Using SSF

1
Department of Biological and Agricultural Engineering, Kansas State University, Manhattan, KS 66506, USA
2
Department of Industrial and Manufacturing Systems Engineering, Kansas State University, Manhattan, KS 66506, USA
*
Author to whom correspondence should be addressed.
Received: 6 February 2019 / Revised: 20 February 2019 / Accepted: 28 February 2019 / Published: 5 March 2019
(This article belongs to the Special Issue Sustainable Biorefinery Processes)
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Abstract

Sweet sorghum juice, a potential bioethanol feedstock, can be incorporated into the dry-grind ethanol process to improve sugar utilization efficiency, thereby enhancing ethanol yields. The juice is normally obtained by pressing the stalk through roller mills in tandem. Juice extraction by this process is known to be labor intensive, less efficient, and susceptible to considerable fermentable sugar loss due to microbial activities when stored at room temperature. Sweet sorghum juice extraction via diffusion has recently been proposed to improve sugar recovery efficiency. In this study, extraction kinetics based on the optimized diffusion parameters (8% grain loading, 85 °C, and 120 min) were determined to describe the mass transfer of sugars in sweet sorghum biomass during the diffusion process. Diffusion parameters obtained from previous studies were used to extract free sugars and convert them into ethanol using granular starch hydrolyzing enzymes (GSHE) and traditional enzymes. Ethanol yields at 72 h of fermentation mashes treated with GSHE and those with traditional enzymes were comparable (14.49–14.56%, v/v). Ethanol fermentation efficiencies also ranged from 88.92–92.02%. View Full-Text
Keywords: bioethanol; diffusion; ethanol fermentation; kinetic model; mass transfer; sweet sorghum juice bioethanol; diffusion; ethanol fermentation; kinetic model; mass transfer; sweet sorghum juice
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Baah Appiah-Nkansah, N.; Li, J.; Zhang, K.; Zhang, M.; Wang, D. Study on Mass Transfer Kinetics of Sugar Extraction from Sweet Sorghum Biomass via Diffusion Process and Ethanol Yield Using SSF. Processes 2019, 7, 137.

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