麦草甲酸制浆漂白过程中木素结构变化的研究

【作者】 潘文音； 樊永明； 王君； 郭奉华；

【机构】 北京林业大学材料科学与技术学院；

【摘要】 本研究主要采用红外差式光谱法对麦草甲酸制浆CEHP漂白前后纸浆中残余木素的结构组成进行了研究,同时用红外光谱测定了纤维素结晶度。结果表明未漂浆中主要存在紫丁香基木素和愈疮木基木素,漂白过程中缩合的愈疮木基木素溶出相对较少。CEHP漂白去除了非共轭羰基结构,从而提高了纸浆的白度。漂后浆纤维素N·O’KI结晶度指数有所增加。本研究可为甲酸制浆漂白工艺的确定提供参考。更多还原

【Abstract】 The structure of the residual lignin in the wheat straw formic acid pulp after CEHP bleaching was analyzed with difference fourier transform infrared ( FTIR ) spectroscopy , and the crystal index of cellulose was determined. The results showed that the lignin in the unbleached pulp was mainly composed of syringyl lignin (S-lignin) and guaiacyl lignin (G-lignin). The condensed G-lignin can hardly be removed during bleaching process. CEHP bleaching can efficiently removed the unconjugated carbonyls, and so as to increase the pulp brightness. Cellulose N·O’KI crystal index in bleached pulp increased after bleaching.更多还原