Catalytic synthesis of cyclohexanone 1,2-propanediol ketal with H_4SiW_(12)O_(40)/PAn

A new environmental friendly catalyst, H_4SiW_(12)O_(40)/PAn was prepared andidentified by means of FT-IR, XRD and TG/DTA. Cyclohexanone 1,2-propanediol ketal was synthesizedfrom cyclohexanone and 1,2-propanediol in the presence of H_4SiW_(12)O_(40)/PAn The factorsinfluencing tlie synthesis were discussed and the best conditions were found out. The optimumconditions are: molar ratio of cyclohexanone to 1,2-propanediol is 1:1.4, the quantity of catalystis equal to 1.0 percent of feed stocks, and the reaction time is 40 min. H_4SiW_(12)O_(40)/PAn is anexcellent catalyst for synthesizing cyclohexanone 1,2-propanediol ketal and its yield can reachover 96.5 percent.

SO_4^(2-)/ZrO_2-La_2O_3催化合成环己酮1,2-丙二醇缩酮

以纳米稀土复合固体超强酸SO42-/ZrO2-La2O3为催化剂,环己酮与1,2-丙二醇为原料合成环己酮1,2-丙二醇缩酮。探讨了酮醇物质的量比、催化剂用量、带水剂环己烷用量、反应时间等因素对产品收率的影响。实验结果表明纳米稀土复合固体超强酸SO42-/ZrO2-La2O3是合成环己酮1,2-丙二醇缩酮的良好催化剂,该合成方法的最佳工艺条件是:以0.20mol环己酮为基准,n(环己酮):n(1,2-丙二醇)=1:1.8,催化剂用量占反应物总质量的2.0%,带水剂用量占反应物总质量的30%,回流分水反应90min,在此条件下环己酮1,2-丙二醇缩酮的收率可达89.45%。