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Valkaistun selluloosan valmistusmenetelmä

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  • Title:
    Valkaistun selluloosan valmistusmenetelmä
  • Author: RAPSON WILLIAM HOWARD
  • Subjects: APPARATUS THEREFOR ; PAPER-MAKING ; PRODUCTION OF CELLULOSE ; PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS ; REGENERATION OF PULPING LIQUORS ; TEXTILES
  • Description: A process for the production of bleached wood pulp including heating, in a digestion operation, a fibrous cellulose material in an aqueous solution containing sodium hydroxide or sodium sulfide or both, separating the fibrous pulp from the solution, sending the solution to a recovery operation that includes evaporating the solution, heating the concentrated solution to form a molten product, dissolving the molten product in water and treating the solution thus obtained to form a solution for new use in the digestion operation and sending the paste to a bleaching operation including partially bleaching the pulp in a first bleaching operation with an aqueous solution of chlorine or chlorine dioxide or both, extracting the partially bleached pulp in a caustic extraction operation with an aqueous solution of hot sodium hydroxide and further bleaching the paste in at least one more bleaching operation, whose procedure This is characterized in that it comprises using the effluent from the caustic extraction operation, at least partially as the agent to cool abruptly, and dissolving the molten product from the heating of the solution in the recovery operation. (Machine-translation by Google Translate, not legally binding)
  • Creation Date: 1971
  • Language: Finnish
  • Source: esp@cenet
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