发明名称 |
CHLORINE-BASED BLEACHING PROCESS FOR KRAFT PULPS USING NON-ALKALINE OR ORGANIC SOLVENT EXTRACTION STAGES |
摘要 |
<p>Extraction of chlorine bleached kraft wood pulps with aqueous peracids at pH values of 7 or below, aqueous sulfites at pH values below 10 or with certain non-aqueous solvents provides extracted pulps having lower residual color and permits use of lesser quantities of alkali or chlorine dioxide in subsequent bleach steps to attain brightness and strength levels comparable to those attained with pulps treated by alkaline extraction at pH values of 10 or higher. At a comparable level of alkali and chlorine dioxide or hypochlorite application, extraction of chlorinated pulp with peracids provides bleached pulps with enhanced brightness.</p> |
申请公布号 |
CA1219707(A) |
申请公布日期 |
1987.03.31 |
申请号 |
CA19840462536 |
申请日期 |
1984.09.06 |
申请人 |
INTERNATIONAL PAPER COMPANY |
发明人 |
RENARD, JEAN J.;BHATTACHARJEE, SHYAM S. |
分类号 |
D21C;D21C9/10;D21C9/14;(IPC1-7):D21C9/14 |
主分类号 |
D21C |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|