Process for the acid hydrolysis of carbohydrate polymers and the continuous fermentation of the sugars obtained therefrom to provide ethanol
US4291124A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1980 |
| Grant date | Sep 22, 1981 |
| Priority date | — |
| Expiry date | Mar 12, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S435/942
- WIPO fieldFood chemistry
- WIPO sectorChemistry
Abstract
A carbohydrate polymer such as starch and/or cellulose is converted to ethanol by a process in which an aqueous slurry of the carbohydrate polymer acid hydrolyzed to provide a sterile fermentable sugar solution is thereafter continuously converted by fermentation to dilute aqueous ethanol ("beer") in a series of agitated fermentations vessels which contain progressively more ethanol and less fermentable suger employing at least two strains of yeast for the fermentation, one of which provides a high rate of ethanol production in a fermentation medium containing a relatively low concentration of ethanol and a relatively high concentration of fermentable sugar and the other of which provides a high rate of ethanol production in a fermentation medium containing a relatively high concentration of ethanol and a relatively low concentration of fermentable sugar.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.