摘要:
A feed containing a sterilie aqueous solution of fermentable sugar and minor amounts of sugar oligomers and/or sugar repolymerizates is continuously converted by fermentation to dilute aqueous ethanol ("beer") in a series of agitated fermentation vessels employing at least two strains of yeast, the first of which provides relatively high rates of conversion of the fermentable sugar to ethanol and the second of which provides relatively high rates of conversion of the sugar oligomers and/or sugar repolymerizates to ethanol.
摘要:
An improved process is provided for the continuous fermentation of sugar to ethanol in a series of fermentation vessels featuring yeast recycle which is independent of the conditions of fermentation occurring in each vessel at a particular point in time. The process facilitates the management of yeast levels in each fermentation vessel so as to provide an optimum overall rate of ethanol production.
摘要:
Starch is recovered from an amylaceous root such as manioc root in the form of an aqueous slurry containing substantially all of the soluble components, e.g., sugars and proteins, of the root prior to processing. To accomplish such recovery, fragmented root is milled in one or more steps in the presence of water to provide a slurry containing liberated starch particles and fiber particles. The fiber particles are separated from the starch particles and the resulting substantially fiber-free initial aqueous starch slurry is concentrated by removal of water therefrom. The water removed from the initial starch slurry contains soluble elements of the starch and is recycled to restore these elements to the recovery system.
摘要:
A fermentable sugar feed containing fermentable sugar oligomers is continuously converted by fermentation to dilute aqueous ethanol ("beer") in a series of agitated fermentation vessels employing at least two strains of yeast, one of which provides a relatively high rate of conversion of fermentable sugar to ethanol and the other of which provides a relatively high rate of conversion of fermentable sugar oligomer to ethanol.
摘要:
Starch derived from dry milled corn is hydrolyzed to provide a sterile aqueous fermentable sugar solution which is especially adapted for fermentative conversion to ethanol with minimum thermal expenditure. Following an initial mild hydrolysis to thin, or liquefy, the starch, substantially all of the water insoluble protein and oil components, and a portion of the water soluble components, e.g., sugars, lipids, proteins and vitamins, are separately recovered from the partial starch hydrolysate with the water solubles being recycled to the system. Thereafter, the partial starch hydrolysate is subjected to further hydrolysis to provide an aqueous solution of fermentable sugar.
摘要:
Starch is recovered from an amylaceous material such as manioc root or corn in the form of an aqueous slurry containing substantially all of the soluble components, e.g., carbohydrates and proteins, of the amylaceous material prior to processing. To accomplish such recovery, amylaceous material is milled in one or more steps in the presence of water to provide a slurry containing liberated starch particles and non-starch components. The initial aqueous starch slurry is then concentrated by removal of water therefrom. The water removed from the initial starch slurry contains soluble elements of the starch and is recycled to restore these elements to the starch recovery system.
摘要:
The yield of fermentable sugar, largely glucose (dextrose), resulting from the acid catalyzed hydrolysis of a carbohydrate polymer such as starch or cellulose can be significantly increased by the addition to the hydrolysate under acid hydrolysis conditions of water soluble non-fermentable carbohydrate such as stillage recovered from a downstream ethanol distillation facility.
摘要:
An improved process is provided for the continuous fermentation of sugar to ethanol in a series of fermentation vessels featuring yeast recycle which is independent of the conditions of fermentation occurring in each vessel at a particular point in time. The process facilitates the management of yeast levels in each fermentation vessel so as to provide an optimum overall rate of ethanol production.
摘要:
Starch is converted to ethanol by a process in which an aqueous starch slurry is hydrolyzed in sequential liquefication and saccharification steps to provide sterile saccharified starch solution containing from about 60 to about 80 weight percent of fermentable sugar based on the weight of the original starch present and the fermentable sugar is thereafter continuously converted by fermentation to dilute aqueous ethanol ("beer") in a series of agitated fermentation vessels which contain progressively more ethanol and less fermentable sugar 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.
摘要:
Starch derived from a dry milled cereal grain such as corn or milo is hydrolyzed to provide a sterile aqueous fermentable sugar solution which is especially adapted for fermentative conversion to ethanol with minimum thermal expenditure. Following an initial mild hydrolysis to thin, or liquefy, the starch, substantially all of the water insoluble protein and oil components, and a portion of the water soluble components, e.g., sugars, lipids, proteins and vitamins, are separately recovered from the partial starch hydrolysate with the water solubles being recycled to the system. Thereafter, the partial starch hydrolysate is subjected to further hydrolysis to provide an aqueous solution of fermentable sugar.