| 摘要 |
Lignocellulosic material is packed in particulate form in a pressure vessel, steam is passed into the pressure vessel at a pressure of at least 500 psi to bring the lignocellulosic material to a temperature in the range 185 to 240 DEG C in less than 60 seconds to plasticize the lignocellulosic material and as soon as the material is plasticized it is extruded through a die to atmosphere to form a particulate material. During extrusion the softened material is subjected to severe deformation and then severe mechanical shock thus fracturing the linkages between lignin,the hemicellulose and the cellulose. The temperature range and rapid rise thereto by the material substantially minimizes degradation of the fragile hemicellulose. The process converts lignocellulosic material into a substrate which is extremely easy to treat by enzymes, either as a feed for ruminant animals or for conversion to sugars and alcohols and for the solvent extraction of lignin. |
