利用酚型木素模型物研究硫酸盐法蒸煮过程中LCC的形成

The Formation of LCC during Kraft Pulping

中文关键词:  愈创木基丙三醇-β-愈创木基醚-［α-13C］  硫酸盐法蒸煮  聚木糖  LCC  苯甲醚键型

Key Words:guaiacylglycerol-β-guaiacyl ether-［α-13C］  kraft pulping  xylan  LCC  benzyl ether linkage

中文摘要:

      模拟硫酸盐法蒸煮过程，将合成的木素模型物（愈创木基丙三醇-β-愈创木基醚-［α-13C］）和典型的半纤维素组分聚木糖进行蒸煮，然后利用酸析沉淀木素、乙酸乙酯抽提等方法将蒸煮后的产物分离，并利用傅里叶变换红外光谱分析仪、13C-核磁共振波谱、异核多量子相干谱对分离后的各个组分进行分析，探讨传统硫酸盐法制浆过程中木素-碳水化合物复合体（LCC）的形成。研究发现，蒸煮产物中有苯甲醚键型LCC形成，而且，这种新型LCC主要存在于酸不溶物中；碱不溶物、乙酸乙酯抽提物和酸可溶物中没有这种新型LCC。

Abstract:

      In order to investigate the formation of lignin-carbohydrate complexes (LCC) during kraft pulping, guaiacylglycerol-β-guaiacyl ether-［α-13C］ were synthesized as lignin model compounds. Then they were cooked by kraft method in the presence of xylan. The black liquor from kraft cooking was classified into four fractions by acidfying precipitation and ethyl acetate extraction. Techniques of FT-IR, 13C-NMR and HMQC were applied to determine each of the fractions and to identify the newly formed LCC structure. The results showed that there was newly formed LCC structure in acid insoluble residues and the LCC structure was mainly connected with benzyl ether linkage. However, no newly formed LCC structure was found in the fraction of alkali insoluble residues, acid soluble residues and ethyl acetate extractives.