リグニンのコバルト (III) 触媒を利用したアルカリ・酸素分解
1985 年 39 巻 12 号 p. 1151-1156
詳細
1985 年 39 巻 12 号 p. 1151-1156
Alkali-oxygen (AO) degradation of lignin catalyzed by Co (III) was investigated in order to obtain phenols from lignin.
The effect of degradation temperature was studied using red pine as a lignin sample. It was found that the main products were vanilline, acetoguaiacone and vanillic acid, and that the total yield of these phenols showed a maximum value, 18.2% at around 150°C, where the selectivity ratio of vanilline among these phenols was also highest.
The above optimum condition was applied to the degradation of the dust part of coconut (Cocos nucifera) husks produced abundantly in tropical and subtropical countries. Eight phenols having 4-hydroxyphenyl, guaiacyl and syringyl structure were obtained in about 12% of yield. This result indicates that the AO-Co (III) system is also effective for the degradation of monocotyledon lignin. These phenols could be separated by a liquid chromatograph combined with solvent extraction. This suggests the possibility that phenols can be separated by a large scale liquid chromatograph.
