System to avoid thermal degradation of chemical compounds during the treatment of wood chips
Abstract
Abstract A SYSTEM TO AVOID THE DECOMPOSITION OF THERMO-DE GRADABLE COMPOUNDS SUCH AS SODIUM BOROHYDRIDE USED IN THE TREATMENT OF LIGINCELLULOSIC MATERIAL FOR THE PRODUCTION OF A HIGH BRIGHTNESS AND HIGH YIELD PULP FOR USE IN PAPER MAKING. WET CHIPS OF LIGNINCELLULOSIC MATERIAL ARE PRESSED TO REDUCE THE WATER CONTENT. THE PRESSED CHIPS ARE PASSED INTO AN IMPREGNATION CHAMBER WHICH CONTAINS AN ALKALINE SOLUTION AND THEN ARE PRESSED A SECOND TIME AND THE EXPRESSED LIQUID IS RECOVERED. PRESSING RAISES THE TEMPERATURE OF THE LIQUID WHICH IS THEN COOLED AND IS RECIRCULATED TO THE IMPREGNATION CHAMBER. COMPOUNDS ABSORBED BY THE CHIPS ARE ADDED TO THE RECOVERED LIQUID AS IT FLOWS FROM THE COOLING STATION TO THE IMPREGNATION CHAMBER.
Inventors
- 👤 P Ghisoni
Bibliographic Details
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