Creusot-loire

Pierre Berger

Gerard Chrysostome

Maurice Gelus

Rolande Kissel

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.degree. 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.

Process and apparatus for hydrolyzing cellulose material

Method for supplying fuel material to a gasification reactor into which a mixture of finely powdered fuel material, in suspension in a liquid phase, is charged inside a pressurized combustion chamber into which the combustion-supporting gas is injected and constituting the reactor, by means of a screw conveyor producing a continuously fluid-tight plug by compression of the driven material. By intermeshing at least two overlapping screws with identical threads rotated in the same direction, a wringing of the mixture introduced through an input orifice is compressed by regulating the flow rate of the mixture supply and the rotary speed of the screws so that, for a given flow rate of material, the plug constituted in a braking zone is at a given pressure and contains a certain proportion of liquid phase. The additional amount of liquid phase is expelled into the braking zone and reascends upstream into a drive zone where it is removed through orifices formed in filtering parts of a sleeve.

Fuel supply method for a gasification chamber

A casing for the n intermeshing screws of a treatment machine has an internal wall comprising n adjacent cylindrical sectors each subtending an angle A, having a radius r, and covering one screw over that part of the periphery which is outside the penetration zone of the screws. The casing is made from n shells, each of which has an internal face in the form of a cylindrical sector of radius r and subtending an angle B, which is less than A, and n guide bars, each of which possesses two concave faces forming a V and which are in the form of cylindrical sectors of radius r and subtending an angle ##EQU1## and the axes of which are parallel and spaced apart by a distance e equal to the distance between the axes of the screws. Each shell is fixed to two guide bars in such a way that its axis coincides with the axes of the corresponding concave faces of the said guide bars.

Casing for a machine, with several parallel screws, for treating

The continuous treatment of a cellulosic material in the form of chips to produce at least partial delignification of the material without true mechanical grinding is effected in apparatus comprising two parallel meshing screws which are rotated in the same direction in a sheath and have identical threads providing a plurality of zones of different pitch. The material is passed in succession through a first zone for feeding the material downstream, a first braking zone for causing a first compression of the material, a second zone for feeding the material downstream and in which the material is brought into contact with a reagent, e.g. steam or a chemical reagent, and a second braking zone for causing a second compression of the material. In each compression stage the material is subject to alternate increases and decreases in pressure, the first compression stage causing the expulsion of any water present in the material and the second compression stage causing the expulsion of any spent reagent and residual liquors in the material.

Process for the continuous impregnation of a cellulosic material

A device for degassing plastic materials comprising an extruder including at least three parallel screws intermeshing in pairs, arranged in a casing which follows the periphery of the screws and arranged around a central stem, the surface of which also follows the periphery of the screws so that the screws are encased over a substantial part of their periphery. The casing is provided with a supply inlet, an end plate through which degassed material is extruded and a degassing outlet through which gases are withdrawn, the degassing outlet being upstream with respect to the supply inlet.

Growing community of inventors

Saint-Etienne, France

Pierre Berger