Synthesis of phosphinic acid resin using acidic 1-butyl-3-methylimidazolium chloroaluminate ionic liquid as catalyst

The resin is functionalized by the introduction of phosphinic acid moieties by Friedel–Crafts phosphination reaction using acidic 1-butyl-3-methylimidazolium chloroaluminate ionic liquid as catalyst. The phosphorous and hydroxyl capacities of the resin are compared with those obtained by using conventional aluminium chloride catalysis. Extraction of uranium(VI) from nitric acid medium by the resins has been studied, and it was found that the distribution coefficient (K_d, mL/g) of uranium(VI) initially decreases with the increase in the concentration of nitric acid, and reaches a minimum value at 1.5 M in nitric acid followed by the increase in K_d values. A maximum distribution coefficient has been obtained when the concentration of nitric acid was 4.0–5.0 M. The extraction data have been fitted in to a Langmuir adsorption model for obtaining the apparent experimental capacity.     

1-甲基-3-丁基咪唑/AlCl3催化制备 2-顺丁烯二酸二(2-乙基己)酯

以顺丁烯二酸酐和2-乙基己醇为原料-环己烷为带水剂在1-甲基-3-丁基咪唑离子液体存在下制备了内增塑剂顺丁烯二酸二(2-乙基己)酯。实验结果表明该催化体系中顺丁烯二酸酐与2-乙基己醇可在理论物质的量比下反应,回流温度反应1．5h时,酯化率达到99．6％,二酯选择性91．6％,与固体酸离子交换树脂催化系统相比,具有反应速度快,产品选择性高和颜色浅的优点。     

Dawson结构磷钼酸铵催化氧化十八醇清洁合成十八酸

以Dawson结构磷钼酸铵为催化剂,用30%H2O2水溶液为氧化剂,研究了十八醇液相选择氧化制十八酸的反应。考察了催化剂用量、反应时间、H2O2用量、反应温度等因素对催化反应的影响。通过单因素检验和正交试验确定了反应的最佳条件:催化剂用量为十八醇质量的3.7%,n(H2O2)/n(醇)比值为10∶1,反应温度为95℃,反应时间为4h,收率可达95.3%。催化剂重复使用5次后,十八酸的收率仍可达91.6%。