PROCESSES FOR PRODUCING FLUFF PULP AND ETHANOL FROM SUGARCANE
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United States of America Patent
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Sep 17, 2015
app pub date -
Mar 6, 2015
filing date -
Mar 11, 2014
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Abstract
The disclosure provides a process for producing fluff pulp and ethanol from sugarcane bagasse or straw, comprising: fractionating the feedstock in the presence of an acid catalyst, a solvent for lignin, and water, to generate a solid/liquid slurry comprising cellulose-rich solids, hemicelluloses, and lignin; separating the solid/liquid slurry into a solid stream and a liquid stream; further treating the cellulose-rich solids to produce fluff pulp; hydrolyzing the hemicelluloses to generate hemicellulose monomers; and fermenting at least a portion of the hemicellulose monomers to cellulosic ethanol. Lignin is removed from the process during one or more steps and combusted to provide energy for process requirements. The process is integrated with, and provides energy to, a first-generation process that ferments sugarcane-derived sucrose to first-generation ethanol. Similar processes are possible with energy cane, corn, and other crops.
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