초록 ▼

Process and device for hydrolyzing cellulose material in an extruder with two parallel screws in which the material introduced in the moist condition and, transported by the screws is malaxated, heated to a temperature of above 200°C. in the downstream part of the extruder where it is contacted with

Process and device for hydrolyzing cellulose material in an extruder with two parallel screws in which the material introduced in the moist condition and, transported by the screws is malaxated, heated to a temperature of above 200°C. in the downstream part of the extruder where it is contacted with an acid solution and progressively compressed, to a pressure higher than the saturated vapor pressure of the liquid phase of the hydrolyzed material at the temperature reached in the downstream part and maintained by a control device for the evacuation of the material. According to the invention, there is provided in the control device for the evacuation of the material, a separation of the liquid phase and of the solid phase from hydrolyzed material with maintenance of the output pressure, through the use for this purpose of a second extruder comprising two screws with axes perpendicular to that of the hydrolysis extruder, rotated within a sleeve into the central part of which the hydrolyzed material coming from the first extruder is discharged and in which a pressure is maintained higher than the saturated vapor pressure of the liquid phase by regulating the extrusion characteristics to form, at the downstream end of the output extruder, a plug of compressed material fluid-tight at said pressure, the latter being regulated by means of a pressure reducing valve controlling the evacuation of the liquid phase concentrated in the upstream part of the extruder and in which glucose formed by hydrolysis is dissolved.

대표청구항 ▼

Process for hydrolysing cellulose material by passing the latter into an hydrolysis extruder comprising at least two parallel screws rotated within a sleeve in which the material introduced in the moist condition and transported by the screws between an inlet orifice and an outlet orifice placed at

Process for hydrolysing cellulose material by passing the latter into an hydrolysis extruder comprising at least two parallel screws rotated within a sleeve in which the material introduced in the moist condition and transported by the screws between an inlet orifice and an outlet orifice placed at the two ends, respectively upstream and downstream of the sleeve, is malaxated and heated until it reaches a temperature above 200°C. in the downstream part of the hydrolysis extruder where it is contacted with an acid solution, and progressively compressed, the outlet orifice being provided with a control device for the evacuation of the hydrolysed material and which can maintain at the outlet of the hydrolysis extruder a pressure higher than the saturated vapour pressure of the liquid phase of the hydrolysed material at the temperature reached in the downstream part, said process comprising effecting in the control device for evacuating the material, a separation of the liquid phase and of the solid phase of the hydrolysed material with maintenance of the outlet pressure, by using for this purpose an output extruder comprising two screws whose axes are perpendicular to that of the hydrolysis extruder and rotated within a sleeve into the central part of which the hydrolysed material coming from the hydrolysis extruder discharges and in which a pressure is maintained higher than the saturated vapour pressure of the liquid phase by regulating the extrusion characteristics to form, at the downstream end of the output extruder, a plug of compressed material fluid-tight at said pressure, the latter being regulated by means of a pressure reducing valve controlling the removal of the concentrated liquid phase in the upstream part of the output extruder and in which the glucose formed by hydrolysis is dissolved.