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Bleaching alkaline digested wood pulps

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  • Title:
    Bleaching alkaline digested wood pulps
  • Author: BAYSEDEN RONALD ; ROGERS JOHN K
  • 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: Pulp is fed to a tower and bleached with aq. Cl2 or Cl2/ClO2 soln. Treated pulp obtd. is mixed with aq. alkali and then O2 treated and delignified e.g. in a tower. Resulting pulp is then washed and mixed with aq. NACL plus NaOH soln. and fed to a reactor for hydrochlorite extraction of lignin at 60-90 deg.C. Delignified pulp obtd. is washed, mixed with ClO2 and fed to a tower for a final ClO2 bleach followed e.g. by washing, etc. and storage. Alternatively ClO2 bleaching can be combined with the hot hypochlorite treatment. Pulp is fed to a tower and bleached with aq. Cl2 or Cl2/ClO2 soln. Treated pulp obtd. is mixed with aq. alkali and then O2 treated and delignified e.g. in a tower. Resulting pulp is then washed and mixed with aq. NACL plus NaOH soln. and fed to a reactor for hydrochlorite extraction of lignin at 60-90 deg.C. Delignified pulp obtd. is washed, mixed with ClO2 and fed to a tower for a final ClO2 bleach followed e.g. by washing, etc. and storage. Alternatively ClO2 bleaching can be combined with the hot hypochlorite treatment. (Machine-translation by Google Translate, not legally binding) UN PROCEDIMIENTO EN VARIAS ETAPAS PARA EL BLANQUEO DE PASTAS PAPELERAS ALCALINAS QUE COMPRENDE AL MENOS TRES ETAPAS DE BLANQUEO, INCLUYENDO UNA EXTRACCION CON OXIGENO EN UN MEDIO ALCALINO (E0) DE UNA ETAPA DE BLANQUEO CON CLORO (C) O CON CLORO/DIOXIDO DE CLORO (CD), SEGUIDO POR UN TRATAMIENTO CON HIPOCLORITO ALCALINO EN CALIENTE (H/E) O SEGUIDO POR UN TRATAMIENTO CON DIOXIDO DE CLORO (D) CON TRATAMIENTO SIMULTANEO CON DIOXIDO DE CLORO (H/ED) EN LA SECUENCIA E0H/ED O E0(H/ED). ESTAS NUEVAS SECUENCIAS DE BLANQUEO SE TRADUCEN EN IMPORTANTES AHORROS TANTO EN TIEMPO COMO EN COSTES OPERATIVOS, EN COMPARACION CON LAS SECUENCIAS DE BLANQUEO CONVENCIONALES CAPACES DE PRODUCIR PRODUCTOS DE UN BRILLO COMPARABLE.
  • Creation Date: 1989
  • Language: English;Spanish
  • Source: esp@cenet
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