| 摘要 |
<p>A method is provided for hydrolyzing polysaccharides in a lignocellulosic feedstock to produce monosaccharides or pretreating a lignocellulosic feedstock, in which an aqueous slurry of the lignocellulosic feedstock is fed into a pressurized dewatering zone wherein the feedstock is partially dewatered and then is compressed into a plug. The plug is introduced into a reaction zone that operates at a pressure (P<sub>r</sub>) equal to greater than about 90 psia and under suitable temperature and pH conditions to hydrolyze the polysaccharides or pretreat the feedstock. The plug provides a pressure seal between the outlet of the dewatering zone and the reaction zone. The pressure (P<sub>dwi</sub>) of the aqueous slurry of the lignocellulosic feedstock at the inlet of the dewatering device is related to P<sub>r</sub> as follows: 0â¤ÎP < the lesser of [(P<sub>r</sub> - 20 psia) and 220 psia], and where ÎP is the absolute difference in pressure between P<sub>r</sub> and P<sub>dwi</sub> in psia.</p> |
