Sulfuric acid bleaching of kraft pulp I: Bleaching of hardwood and softwood kraft pulps

被引：6

作者：

Ikeda, T

Hosoya, S ^{[1
]}

Tomimura, Y

Magara, K

Takano, I

机构：

[1] Univ Tsukuba, Inst Agr & Forest Engn, Tsukuba, Ibaraki 3056000, Japan

[2] Forestry & Forest Prod Res Inst, Wood Chem Lab, Wood Chem Div, Ibaraki, Osaka 305, Japan

来源：

JOURNAL OF WOOD SCIENCE | 1999年 / 45卷 / 03期

关键词：

sulfuric acid; nonchlorine bleaching; kraft pulp; residual lignin;

D O I：

10.1007/BF01177731

中图分类号：

S7 [林业];

学科分类号：

0829 ; 0907 ;

摘要：

To develop a new nonchlorine bleaching technology, hardwood and softwood kraft pulps, before and after oxygen-alkali predelignification, were treated with dilute sulfuric acid solutions (pH 1.0-1.8) at 100 degrees C for Ih and then extracted with aqueous sodium hydroxide at 70 degrees C for Ih. Hardwood kraft pulp was successfully bleached. The delignification selectivity was similar to that seen with oxygen-alkali bleaching; and it was greatly enhanced by the addition of sodium nitrate and sodium nitrite. The sulfuric acid bleaching can replace the presently adopted oxygen and chlorine stages if the additives are allowed. This bleaching process was also effective for oxygen-bleached hardwood kraft pulp? but it was less effective for softwood kraft pulp and oxygen-bleached softwood kraft pulp. The effectiveness of the addition of sodium nitrate and sodium nitrite was more apparent for softwood kraft pulp than for hardwood kraft pulp.

引用

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页码：233 / 237

页数：5

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