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本文以漂白阔叶木浆为原料,研究了制备微晶纤维素过程中不同金属离子对纤维素酸水反应的催化作用,并采用X射线衍射图谱(XRD)、扫描电镜(SEM)等方法对水解纤维素进行了分析和表征。结果表明,添加Fe3+、Al3+、Cu2+和Co2+有利于促进纤维素的酸水解反应,其中Fe3+的催化作用最佳;当Fe3+的浓度为0.3mol/L时,水解纤维素的得率为91.27%,聚合度为166,达到了微晶纤维素的极限聚合度;XRD分析表明,添加Fe3+更有利于纤维素无定形区的选择性酸水解,提高水解纤维素的结晶度。
In this paper, bleached hardwood pulp was used as a raw material to study the catalytic effect of different metal ions on cellulose acid-water reaction during the preparation of microcrystalline cellulose. The effects of different metal ions on cellulose acid-water reaction were studied. X-ray diffraction (XRD), scanning electron microscopy Cellulose was analyzed and characterized. The results showed that adding Fe3 +, Al3 +, Cu2 + and Co2 + was beneficial to the acid hydrolysis of cellulose. The catalytic effect of Fe3 + was the best. When the concentration of Fe3 + was 0.3mol / L, the yield of cellulose was 91.27% The degree of polymerization was 166, which reached the ultimate polymerization degree of microcrystalline cellulose. XRD analysis showed that the addition of Fe3 + was more favorable for the selective acid hydrolysis of cellulose amorphous region and the degree of crystallinity of hydrolyzed cellulose.