Behavior of Eucalyptus Kraft Pulp Extractives Components across ECF Bleaching and Their Impact on Brightness Reversion

被引：10
作者：
Maltha, Celia R. A. [1 ]
Barbosa, Luiz C. A. [1 ]
Azevedo, Marco A. B. [2 ]
Colodette, Jorge L. [2 ]
机构：
[1] Univ Fed Vicosa, Dept Chem, BR-36570000 Vicosa, MG, Brazil
[2] Univ Fed Vicosa, Forest Engn Dept, BR-36570000 Vicosa, MG, Brazil
来源：
JOURNAL OF WOOD CHEMISTRY AND TECHNOLOGY | 2011年 / 31卷 / 02期
关键词：
Eucalyptus kraft pulp; pulp bleaching; GC-MS; lipophilic extractives; brightness reversion; CHROMATOGRAPHY-MASS SPECTROMETRY; LIPOPHILIC EXTRACTIVES; WOOD EXTRACTIVES; CHEMICAL-COMPOSITION; CELLULOSE PULP; PITCH DEPOSITS; GLOBULUS; OZONE; HARDWOODS; HEAT;
D O I：
10.1080/02773813.2010.502283
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：
This study investigated the chemical composition of the dichloromethane and acetone extracts of eucalypt pulp across D(EP)DP and AZDP bleaching sequences by gas chromatography-mass spectrometry (GC-MS). The bleaching stages led to the partial removal and to several oxidative transformations of fatty acids and sterols, the main lipophilic extractives found in the unbleached pulp. The pulp samples were bleached to 90-91% ISO by D(EP)DP and AZDP sequences and their brightness stability and chemical characteristics determined. The effect of aging on brightness was investigated. The AZDP bleaching sequence resulted in pulps of higher brightness stability. Furoic structures representing the main acid degradation products of HexA are suggested as the actual intermediates that cause yellowing by forming colored compounds. The AZDP process removed larger amounts of HexA across bleaching.
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页码：103 / 120
页数：18
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