Abstract: 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.

Abstract: Sucrose which is found in thick juice such as obtained from sugar beet or sugar cane may be selectively extracted therefrom by passing an aqueous solution of the thick juice over a solid adsorbent comprising a stabilized type Y zeolite such as Union Carbide Corporation LZ-Y20 adsorbent, preferably bound with a water permeable organic polymer. The sucrose will be selectively adsorbed thereon and separated from other thick juice ingredients such as raffinose, KCl and betaine. The sucrose is then removed from the adsorbent by treatment with a desorbent material comprising an alcohol. The desorbent is flushed from the adsorbent with water prior to the subsequent contact of the adsorbent with the feed stream.