首页>
外国专利>
PROCESS FOR OBTAINING A BETTER SELECTIVITY OF A PULP DURING HIGH OXYGEN CONSISTENCY DRAIGNIFICATION, AND A PROCESS FOR OBTAINING A NON-WHITENED PULLEY DESIGNIFICATION DURING THE DELIGNIFICATION OF ELEVEN
PROCESS FOR OBTAINING A BETTER SELECTIVITY OF A PULP DURING HIGH OXYGEN CONSISTENCY DRAIGNIFICATION, AND A PROCESS FOR OBTAINING A NON-WHITENED PULLEY DESIGNIFICATION DURING THE DELIGNIFICATION OF ELEVEN
展开▼
机译:高氧浓度脱除过程中获得纸浆更好的选择性的方法,以及在脱脂过程中获得非白化皮带轮的过程
展开▼
页面导航
摘要
著录项
相似文献
摘要
Unbleached pulp is washed with an aqueous alkaline solution in a wash press to substantially uniformly distribute a first amount of alkaline material throughout the pulp. The consistency of the pulp exiting the wash press is above about 18%, preferably between 25 to 35 percent by weight, and the high consistency alkali containing pulp is then treated with oxygen to effect delignification. The use of a wash press reduces the overall amounts of alkaline material utilized in the process compared to processes which add alkaline material to the pulp at low consistency. Additional alkali may be applied, if desired, onto the high consistency pulp prior to oxygen delignification to provide a total amount of between 0.8 and 7 percent by weight of oven dry pulp. High strength, low lignin pulps are formed after oxygen delignification which may be further bleached to high brightness with reduced amounts of bleaching chemicals.
展开▼