Enhancing profitability of dry mill ethanol plants: Process modeling and economics of conversion of degermed defibered corn ethanol

• Published in: Applied biochemistry and biotechnology 2005, Vol.120 (1), p.37-50
• Main Authors: Rajagopalan, S, Ponnampalam, E, McCalla, D, Stowers, M
• Format: Article
• Language: English
• Subjects: Biochemistry; Biological and medical sciences; Biotechnology; Biotechnology - economics; Biotechnology - instrumentation; Biotechnology - methods; Chemical Fractionation - methods; Conversion; Corn; cost analysis; Costs and Cost Analysis; Dietary Fiber - analysis; dry milling; Ethanol; Ethanol - economics; Ethanol - isolation & purification; Ethanol - metabolism; ethanol production; Fermentation; Fundamental and applied biological sciences. Psychology; Operating costs; Return on investment; Sensitivity and Specificity; Studies; Zea mays - chemistry
• ISSN: 0273-2289; 1559-0291; 0273-2289
• DOI: 10.1385/ABAB:120:1:37

An Aspen Plus modeling platform was developed to evaluate the performance of the conversion process of degermed defibered corn (DDC) to ethanol in 15- and 40-million gallons per year (MGPY) dry mill ethanol plants. Upstream corn milling equipment in conventional dry mill ethanol plants was replaced with germ and fiber separation equipment. DDC with higher starch content was fed to the existing saccharification and fermentation units, resulting in higher ethanol productivity than with regular corn. The results of the DDC models were compared with those of conventional dry mill ethanol process models. A simple financial analysis that included capital and operating costs, revenues, earnings, and return on investment was created to evaluate each model comparatively. Case studies were performed on 15- and 40-MGPY base case models with two DDC process designs and DDC with a mechanical oil extraction process.