College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China.
Molecules. 2019 Aug 5;24(15):2836. doi: 10.3390/molecules24152836.
In the early stage, the best conditions for alkali-bound ozone pretreatment were studied. But after treatment, the alkaline black liquor was directly discarded due to the large amount of organic matter, resulting in environmental pollution and waste of resources. In this paper, the alkaline black liquor was recycled under the optimal pretreatment conditions. The results showed that the number of alkaline black liquor cycles had little effect on hemicellulose content, and had a great influence on cellulose content and lignin content. Through structural characterization of corn stover, it was found that the pretreatment caused structural changes of lignin in straw. However, when the alkaline black liquor was recycled for the fourth time, the ether bond in the side chain of lignin and the covalent bond between the components were not sufficiently destroyed, and the damage to the phenolic hydroxyl group was also weakened. It was indicated that when the alkaline black liquor was recycled for the fourth time, the destruction effect of the alkaline black liquor on the straw was significantly inhibited. Therefore, the optimal circulation time of alkaline black liquor was three times, and the cellulolytic conversion rate was 81.53%.
在早期阶段，研究了碱结合臭氧预处理的最佳条件。但处理后，由于有机物含量大，碱性黑液直接被废弃，造成环境污染和资源浪费。本文在最佳预处理条件下对碱性黑液进行了回收利用。结果表明，碱性黑液循环次数对半纤维素含量影响较小，而对纤维素含量和木质素含量影响较大。通过对玉米秸秆的结构表征，发现预处理导致了秸秆中木质素结构的变化。然而，当碱性黑液循环使用第四次时，木质素侧链中的醚键和组分之间的共价键并没有被充分破坏，对酚羟基的破坏也减弱了。这表明当碱性黑液循环使用第四次时，碱性黑液对秸秆的破坏作用明显受到抑制。因此，碱性黑液的最佳循环时间为 3 次，纤维素转化率为 81.53%。
