发明名称 |
PROCESS FOR BLEACHING OF CELLULOSE FIBRE EXCLUDING THE USE OF CHLORINE |
摘要 |
The process comprises three stages, namely an oxygen bleach which is optionally combined with a hydrogen peroxide bleach (EOP stage), an ozone bleach (Z stage) and a peroxide bleach (P stage). According to the invention, the residual oxygen content of the exit air from the Z stage is completely reacted in the EOP stage, and the effluent of the Z stage is used for dilution between the EOP and Z stages and/or for ash removal from the pulp after bleaching. It is advantageous in this case to control the temperature, the NaOH supply and the O2/H2O2 ratio in the EOP stage, so that the oxygen consumption at a constant conversion is adjusted to the residual oxygen content of the exit air from the Z stage. |
申请公布号 |
LTIP753(A) |
申请公布日期 |
1995.01.31 |
申请号 |
LTIP753 |
申请日期 |
1993.07.02 |
申请人 |
LENZING AKTIENGESELLSCHAFT |
发明人 |
HRUSCHA,ANTON;PETER,WALTER;HOEGLINGER,OSKAR |
分类号 |
D06L3/02;D06L3/14;D21C9/10;D21C9/147;D21C9/153;D21C9/16 |
主分类号 |
D06L3/02 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|