Pretreatment and fractionation of corn stover by ammonia recycle percolation process.

摘要: Corn stover was pretreated with aqueous ammonia in a flow-through column reactor, process termed as Ammonia Recycle Percolation (ARP). The causes swelling and efficient delignification of biomass at high temperatures. ARP solubilizes about half xylan, but retains more than 92% the cellulose content. Enzymatic digestibility ARP-treated corn is 93% 10 FPU/g-glucan enzyme loading. SEM pictures FTIR spectra confirm effects process. X-ray crystallography data indicate that basic crystalline structure cellulosic component not altered by treatment. Low-liquid can reduce liquid throughput residence time to 3.3 mL/g-biomass 10-12 min, without adversely affecting overall effectiveness. low-water achieved 73.4% 88.5% 15 FPU/g-glucan. ethanol yield from SSF low-liquid using Saccharomyces cerevisiae reached 84% theoretical maximum. Successive operation hot-water treatment applied method fractionation. two-stage separated xylan first stage (84%) lignin second (75%), resulting treated solid contains 79% glucan.