摘要
以H4SiW12O40/SiO2为催化剂,丁醛和1,2-丙二醇为原料合成了丁醛1,2-丙二醇缩醛,用正交实验法研究了反应物料配比、催化剂用量、带水剂用量、反应时间等因素对反应的影响。结果表明,在n(丁醛):n(1,2-丙二醇)=1:1.5,催化剂用量为反应物料总质量的0.6%,带水剂环己烷10mL,反应时间45min的优化条件下,丁醛1,2-丙二醇缩醛的收率可达74.1%。
IButyraldehyde 1,2-propanediol acetal was synthesized from butyraldehyde and 1,2-propanediol in the presence of H4SiW12O40/SiO2.The factors influencing the synthesis were discussed and the best conditions were found out.The optimum conditions are:molar ratio of butyraldehyde to 1,2-propanediol is 1:1.5,the quantiy of catalyst is equal to 0.6% of feed stocks,the volume of cyclohexane as the water-carrying agent is 10 mL,and the reaction time is 45 min.H4SiW12O40/SiO2 is an excellent catalyst for synthesizing butyraldehyde 1,2-propanediol acetal and its yield can be up to 74.1%.
