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In an ethanol fermentation process in which an aqueous solution of fermentable sugar is converted by an ethanol-producing microorganism such as a yeast to a dilute aqueous solution of ethanol with the ethanol being present in the solution at a concentration which does not exceed a predetermined maxi

In an ethanol fermentation process in which an aqueous solution of fermentable sugar is converted by an ethanol-producing microorganism such as a yeast to a dilute aqueous solution of ethanol with the ethanol being present in the solution at a concentration which does not exceed a predetermined maximum level, an improvement is provided which comprises selectively sorbing ethanol present in the solution within a hydrophilic crystalline aluminosilicate ZSM-5 or HZSM-5 zeolite so that the non-sorbed ethanol present in the solution does not exceed the predetermined maximum level of concentration therein, and thereafter removing sorbed ethanol from the zeolite.

대표청구항 ▼

In an ethanol fermentation process in which an aqueous solution of fermentable sugar is converted by an ethanol-producing microorganism to carbon dioxide and a dilute aqueous solution of ethanol with the ethanol being present in the solution at a concentration which does not exceed a predetermined m

In an ethanol fermentation process in which an aqueous solution of fermentable sugar is converted by an ethanol-producing microorganism to carbon dioxide and a dilute aqueous solution of ethanol with the ethanol being present in the solution at a concentration which does not exceed a predetermined maximum level, said predetermined maximum level of ethanol being selected to be that which is below the level of ethanol causing fermentation to substantially cease, the improvement comprising selectively sorbing ethanol present in the solution during fermentation within a hydrophobic crystalline aluminosilicate ZSM-5 or HZSM-5 zeolite possessing a silica to alumina ratio of greater than about 12 so that the non-sorbed ethanol present in the solution does not exceed the predetermined maximum level of concentration therein, and thereafter desorbing sorbed ethanol from the zeolite by stripping said zeolite with the carbon dioxide obtained from the ethanol fermentation process.