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クラフト木材パルプ用の短手順のＥＣＦ漂白プロセスＸ／Ｄ－Ｚ－Ｐ（Ｘ／Ｚ－Ｄ－Ｐ）

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  • Title:
    クラフト木材パルプ用の短手順のＥＣＦ漂白プロセスＸ／Ｄ－Ｚ－Ｐ（Ｘ／Ｚ－Ｄ－Ｐ）
  • Subjects: APPARATUS THEREFOR ; IMPREGNATING OR COATING OF PAPER ; PAPER NOT OTHERWISE PROVIDED FOR ; PAPER-MAKING ; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D ; PRODUCTION OF CELLULOSE ; PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS ; PULP COMPOSITIONS ; REGENERATION OF PULPING LIQUORS ; TEXTILES ; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G
  • Description: クラフト木材パルプ用の短手順のＥＣＦ漂白方法Ｘ／Ｄ－Ｚ－Ｐ（又はＸ／Ｚ－Ｄ－Ｐ）を提供する。本発明は、パルプ化および製紙の技術分野に属し、クラフト木材パルプ用の短手順のＥＣＦ漂白方法Ｘ／Ｄ－Ｚ－Ｐ（又はＸ／Ｚ－Ｄ－Ｐ）に関し、それは、酸素脱リグニン後のクラフト木材パルプに対して、ＸとＤの間で洗浄せずにＸ／Ｄ順次漂白を行う順次漂白（Ｘ／Ｄ）ステップ（１）と、Ｘ／Ｄ順次漂白後のパルプに対してオゾン漂白を行うオゾン漂白（Ｚ）ステップ（２）と、オゾン漂白後のパルプに対して、最後に過酸化水素漂白を行い、完全に漂白されたパルプ（８８％ＩＳＯ）を得る過酸化水素漂白（Ｐ）ステップ（３）と、上記の漂白手順のＤとＺの位置を交換することができ、プロセスをＸ／Ｄ－Ｚ－ＰからＸ／Ｚ－Ｄ－Ｐに変更すると、最終的な漂白結果には影響しないステップ（４）と、を含む。従来のＤ－Ｅｏ－Ｄ－Ｄ漂白手順と比較して、Ｘ／Ｄ－Ｚ－Ｐ（又はＸ／Ｚ－Ｄ－Ｐ）漂白手順は、４つの漂白段階から３つの漂白段階に減少し、オゾンおよび過酸化水素グリーン漂白剤を使用し、二酸化塩素漂白段階は１つだけである。したがって、本発明により提供される漂白方法は、漂白水の消費量と廃水の毒性を大幅に低減し、最終パルプの同じ白色度で、二酸化塩素の消費量を５０％以上削減し、水の消費量を２０％以上削減する。 The present invention belongs to the technical field of pulping and papermaking, and relates to a short-procedure ECF bleaching process X/D-Z-P (or X/Z-D-P) for sulfate wood pulp. The process comprises the following steps: (1) sequential bleaching (X/D): performing X/D sequential bleaching on sulfate wood pulp subjected to oxygen delignification without washing between X and D; (2) ozone bleaching (Z): performing ozone bleaching on the paper pulp subjected to X/D sequential bleaching; (3) hydrogen peroxide bleaching (P): finally performing hydrogen peroxide bleaching on the paper pulp subjected to ozone bleaching, so as to obtain fully bleached paper pulp (88% ISO); and (4) the positions of D and Z in the bleaching procedure can be exchanged, and changing the process from X/D-Z-P to X/Z-D-P does not affect the final bleaching result. Compared with a traditional D-E0-D-D bleaching sequence, the X/D-Z-P (or X/Z-D-P) bleaching sequence is reduced from four stages to three stages, and an ozone and a hydrogen peroxide green bleaching agent are used, having only one chlorine dioxide bleaching stage. Therefore, in the bleaching method provided in the present invention, the water usage for bleaching and wastewater toxicity are greatly reduced, and under the same whiteness of the final paper pulp, the chlorine dioxide usage is reduced by 50% or more, and the water usage is reduced by 20% or more.
  • Creation Date: 2022
  • Language: Japanese
  • Source: esp@cenet
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