蒙脱土结构和性质对催化不饱和脂肪酸二聚化反应的影响

发布时间：2018-03-09 06:33

本文选题：蒙脱土　切入点：催化　出处：《化工学报》2017年S1期 　论文类型：期刊论文

【摘要】：钠基蒙脱土经过一次插层有机改性和二次插层有机改性后制得有机改性蒙脱土,作为催化剂用于催化不饱和脂肪酸二聚化反应制备二聚酸。采用XRD、SEM、TEM、FTIR和TG等检测手段对有机改性后蒙脱土的内层结构和性质进行分析。实验表明改性后蒙脱土层间距由1.48nm扩大到3.82nm,而且保持原来的夹心结构不变。蒙脱土的表面形貌和内部结构发生改变,表面变得疏松,内部层间距扩大且插层剂含量增加,分散实验表明二次插层有机改性蒙脱土在不饱和脂肪酸中分散性能优异。相同条件下,二次插层有机改性蒙脱土催化不饱和脂肪酸二聚化反应,二聚酸产率75.33%,是未改性蒙脱土催化制得二聚酸产率的2.14倍,并通过FTIR、1 H NMR和LC-MS证实合成的产物为二聚酸。
[Abstract]:Organic modified montmorillonite was prepared by organic modification of sodium montmorillonite and secondary intercalation of montmorillonite. The inner structure and properties of organically modified montmorillonite were analyzed by means of XRDX SEM Tem FTIR and TG. The results showed that the modified montmorillonite intercalated with montmorillonite was used as catalyst for the dimerization of unsaturated fatty acids to prepare dimeric acid. The distance was expanded from 1.48 nm to 3.82 nm, and the original sandwich structure remained unchanged. The surface morphology and internal structure of montmorillonite changed. The surface became loose, the interlayer spacing increased and the content of intercalant increased. The dispersion experiment showed that the secondary intercalation organic modified montmorillonite had excellent dispersion performance in unsaturated fatty acids. The secondary intercalation organic modified montmorillonite catalyzed unsaturated fatty acid dimerization, the yield of dimeric acid was 75.33, which was 2.14 times higher than that of unmodified montmorillonite, and the product was proved to be dipolyacid by FTIR 1H NMR and LC-MS.
【作者单位】：仲恺农业工程学院化学化工学院;
【基金】：国家自然科学基金项目(31401526)~~
【分类号】：O631.5;O643.3

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