Bleaching and refining process for producing dissolving pulps
    4.
    发明授权
    Bleaching and refining process for producing dissolving pulps 失效
    用于生产溶解浆的漂白和精炼工艺

    公开(公告)号:US3817825A

    公开(公告)日:1974-06-18

    申请号:US26395472

    申请日:1972-06-19

    申请人: ITT

    IPC分类号: D21C9/08 D21C9/12 D21C9/14

    CPC分类号: D21C9/083

    摘要: DISSOLVING PULPS SUITABLE FOR USE IN THE MANUFACTURE OF VISCOSE RAYON ARE PREPARED FROM UNBLEACHED SULFITE PULPS BY A BLEACHING AND REFINING PROCESS INCLUDING THE STEPS OF (1) CHLORINATION; (2) COMBINED ALKALINE HYPOCHLORITE DILUTE CAUSTIC EXTRACTION; (3) COLD CAUSTIC EXTRACTION WITH CONCENTRATED CUASTIC SOLUTION AND (4) ALKALINE HYPHOCHLORITE TREATMENT.