Softwood kraft pulp bleaching in the presence of sodium nitrate/nitrite mixtures. I. Factors affecting the process

被引：0

作者：

Gavrilescu, D ^{[1
]}

Beleca, C

Popa, VI

Anghel, N

机构：

[1] Tech Univ Jassy, Fac Ind Chem, Jassy, Romania

[2] Petru Poni Inst Macromol Chem, Jassy, Romania

来源：

CELLULOSE CHEMISTRY AND TECHNOLOGY | 1999年 / 33卷 / 5-6期

关键词：

NaNO3/NaNO2; non-chlorine bleaching; enzyme bleaching;

D O I：

暂无

中图分类号：

TB3 [工程材料学]; TS [轻工业、手工业、生活服务业];

学科分类号：

0805 ; 080502 ; 0822 ;

摘要：

Pretreatment of spruce kraft pulp with NaNO3/NaNO2 mixtures in acidic medium is investigated. The main factors affecting the delignification degree are chemical charge, NaNO3/NaNO2 ratio and pH. In the presence of 4% NaNO3, 2% NaNO2, at pH 2.5-3 (sulfuric acid), followed by alkaline extraction, the lignin content is decreased by 50-60%, without extensive loss of viscosity. As a result of treatment with NaNO3/NaNO2, the reactivity of residual lignin is increased prior to final bleaching. This new pulp pretreatment method can be a realistic alternative to oxygen/alkali delignification.

引用

页码：473 / 482

页数：10