The objective of this study was to analyze the processing and technoeconomic feasibility of coproduction of D-psicose and ethanol in a modified dry grind ethanol process. The yeast strain was constructed by expressing D-psicose 3-epimerases (DPE) in Sachharomyces cerevisiae. The strain was capable of converting D-fructose to D-psicose at 55 °C with a conversion efficiency of 26.6%. A comprehensive process model for modified dry grind ethanol plant with 396,000 MT/yr corn processing capacity was developed using SuperPro Designer. Predicted ethanol and D-psicose yields were 390.4 L and 75.3 kg per MT of corn, with total annual production of 154.6 million L and 29,835 MT respectively. The capital investment for the plant was estimated as 150.3 million USD with total operating cost of 85.2 million USD/yr. The unit production cost and minimum selling price of D-psicose with an internal rate of return of 15% were calculated as $0.43/kg and $1.29/kg respectively.
- Corn ethanol
- Rare sugar
- Technoeconomic model
ASJC Scopus subject areas
- Environmental Engineering
- Renewable Energy, Sustainability and the Environment
- Waste Management and Disposal