木质素制备香兰素的工艺研究

Study on the Factors in the Preparation of Vanillin from Lignin

用造纸废液分离的木质素与亚硫酸氢钠反应生成木质素磺酸盐,该盐在碱性条件下进行高压催化氧化,经萃取精制后得到香兰素。用正交实验方法考察了木质素磺化、木质素磺化盐氧化及香兰素的萃取过程中,各主要工艺参数的变化对香兰素收率的影响,并得出了最佳的工艺条件。实验结果表明:在最佳工艺条件下,木质素经磺化,磺酸盐经氧化后,生成的香兰素收率最高可达10.8%。

Lignin sulfonate was prepared by reaction between sodium hydrosulfite and lignin which was separated from papermaking effluents. The formed sulfonate was catalytically oxidized under high pressure in alkalescence solution, and then vanillin was extracted and refined. Having reviewed the influence of varying process parameters to the yield of vanillin in the course of sulfonation of lignin, oxidation of lignin sulfonate and extraction of vanillin, the optimized process parameters were obtained. The results showed that the maximum yield ratio of vanillin was 10.8% under the optimized conditions.