Ozonólise das ligninas organossolve e kraft eucalipto. Parte II: cinética nos meios ácido e básico

Química Nova

Evandro A. Nascimento²  Sérgio A. L. Morais²  Francisco J. T. Aquino¹  Dorila Piló - Veloso¹ 

[1] ,Universidade Federal de Uberlândia Departamento de Química Uberlândia MG

关键词: ozonolysis;    ozone bleaching;    organosolv and kraft lignins;   

DOI  :  10.1590/S0100-40421998000500009

来源: SciELO

【 摘 要 】

Organosolv and kraft lignins were treated with ozone both in basic and acid media and the reaction was studied kinetically. In contrast to reported studies, ozone was more efective in basic medium. Kraft lignin was degraded faster than organosolv lignin in both media but in the basic medium the rate of reaction was very much faster than in the acid one: for kraft lignin, the observed degradation was 93% for 2 min of reaction in the basic medium and 56% for 10 min of reaction in the acid medium; for organosolv lignin, 47% and 25%, respectively, in the same times. Higher phenolic hydroxyl groups contents increase the reaction rate.

【 授权许可】

CC BY-NC   
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