| 摘要 |
<p>The process for treating a ligno-cellulosic biomass feed stream comprised of solids, C5's, C6's, lignin, and water comprises the steps of: pretreating the ligno-cellulosic biomass feed stream by contacting the ligno-cellulosic biomass with water in the temperature range of 40 to 210 ° C. to create a pre-treated ligno-celluosic biomass comprised of a pre-treatment ligno-cellulosic biomass liquid comprised of suspended solids, C5's, C6's, and acetic acid, wherein the ratio of the C6's to C5's is less than 0.8 to 1.0, and a pre-treated ligno-cellulosic biomass solids; separating a portion of the pre-treatment ligno cellulosic biomass liquid from the pre-treated ligno-cellulosic biomass feed stream; separating a portion of the suspended solids from the pre-treatment ligno-cellulosic biomass liquid using filters, centrifuge or combination thereof, to create a clarified liquid stream, and nano filtering a portion of the clarified liquid stream to create a nano-filtered permeate stream comprised of acetic acid and water and a nano-filtered retentate stream comprised of C5's, C6's, acetic acid and water, wherein the ratio of acetic acid to the total amount of C5's, C6's in the clarified liquid stream is greater than the ratio of the acetic acid to the total amount of C5's, C6's in the nano-filtered retentate.</p> |
