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利用多聚甲醛和环丁砜等非质子溶剂合成三聚甲醛有望克服利用甲醛水溶液或甲醛气体合成三聚甲醛面临的诸多问题,但多聚甲醛的分解和三聚甲醛的合成需在不同温度下进行,且现有催化剂的效果偏低.为此,本文系统研究了典型离子液体的催化效果,包括由硫酸氢根、甲基磺酸根、苯磺酸根、对氯苯磺酸根、对甲基苯磺酸根或磷酸二氢根和咪唑类或吡咯烷酮类阳离子形成的离子液体的催化效果.同时,研究了阴阳离子结构对离子液体的Hammett酸度函数H_0值的影响及具有良好催化效果的适宜H_0值范围,获得了能使多聚甲醛的分解和三聚甲醛的生成在同一温度下进行,同时提高三聚甲醛收率和甲醛转化率的离子液体催化剂,为建立三聚甲醛合成新技术奠定了基础.
The use of paraformaldehyde and sulfolane aprotic solvents such as synthesis of trioxane is expected to overcome the use of formaldehyde solution or formaldehyde gas synthesis of paraformaldehyde face many problems, but paraformaldehyde decomposition and synthesis of paraformaldehyde to be carried out at different temperatures, And the effect of the existing catalysts is low.Therefore, the catalytic effects of typical ionic liquids are systematically investigated in this paper, including the catalytic effect of hydrogen sulfate, methanesulfonate, benzenesulfonate, p-chlorobenzenesulfonate, p-toluenesulfonate Or dihydrogen phosphate and imidazole or pyrrolidone cation.At the same time, the influence of the structure of anion and cation on Hammett acidity function H_0 of ionic liquid and the suitable range of H_0 with good catalytic effect were studied, An ionic liquid catalyst that can decompose paraformaldehyde and generate paraformaldehyde at the same temperature while increasing the yield of paraformaldehyde and the conversion of formaldehyde can lay a foundation for the establishment of a new synthesis technique of paraformaldehyde.