D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
9/33, 92/52
D21C 3/24 (2006.01) D21C 1/00 (2006.01)
Patent
CA 1038113
ABSTRACT A method and apparatus is provided for continuously hydrolizing finely comminuted fiber material and continuously extracting acid hydroly- sate. The fiber material is fed into a steam phase at the top of a stand- ing, closed reaction vessel. In this phase the material is heated to approx- imately 170°C. Further down in the vessel, the material is exposed to a short liquid phase, concurrent impregnation, and simultaneous short concur- rent hydrolysis. Still further down in the vessel, in a counter-current part having twice the diameter of the concurrent part of the vessel, the material is exposed to a liquid phase, a countercurrent wash and simultaneous countercurrent hydrolysis with pre-heated wash liquid. This liquid is intro- duced by distributing means close to the bottom of the vessel and is at a temperature of around 170°C. Displaced liquid containing a major part of the dry substances in the hydrolysate is extracted and removed from the vessel at the upper end of the counter-current treatment section. The fiber mater- ial relieved of the hydrolysate is discharged from the lower part of the ves- sel and preferably fed directly to a succeeding sulphate digester.
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