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研究了从碱法造纸废液先提取木质素 ,进一步磺化得木素质磺酸盐 ,从而合成香兰素的工艺条件 ,对小型造纸厂黑液治理有重要意义.“,”This paper studied the technological condition of synthesis of vanillin wich first extract lignrin from alkaline papermaking liqguid and then obtained lignin sulfonate by further sulfonate.It has very important significance for small paper mill to administrate black liquor.