초록 ▼

A continuous process for the production of alcohol, preferably ethanol, from cellulosic materials. The cellulosic materials are delignified such that the hemicellulose and the cellulose can be subsequently acid hydrolyzed into simple sugars. These sugars are fermented in the presence of yeast to yie

A continuous process for the production of alcohol, preferably ethanol, from cellulosic materials. The cellulosic materials are delignified such that the hemicellulose and the cellulose can be subsequently acid hydrolyzed into simple sugars. These sugars are fermented in the presence of yeast to yield ethanol and carbon dioxide. The alcohol vapor is removed from the fermentation solution under a reduced pressure and subsequently distilled. Carbon dioxide gas may be sparged throughout the fermenting solution in order to aid in the removal of the alcohol from the fermenting solution. The gaseous carbon dioxide is captured and utilized in the manufacture of additional quantities of ethanol or other basic chemicals.

대표청구항 ▼

A process for the conversion of cellulosic material into fermentable sugars, the process consisting essentially of the following steps: obtaining a feedstock, at least a portion of which is a cellulosic material; contacting the cellulosic material with a concentrated delignifying acid said concentra

A process for the conversion of cellulosic material into fermentable sugars, the process consisting essentially of the following steps: obtaining a feedstock, at least a portion of which is a cellulosic material; contacting the cellulosic material with a concentrated delignifying acid said concentrated delignifying acid being in a liquid phase and having a temperature of less than about 60°F. and having a concentration of from about 60% to about 90% acid by volume, thereby producing a cellulose-containing solution and a solid residue; removing the solid residue from the cellulose-containing solution; precipitating cellulose from the cellulose-containing solution; and hydrolyzing the precipitated cellulose with a dilute hydrolyzing acid, thereby producing fermentable sugars.