微波辐射改性可膨胀石墨催化合成苯甲醛乙二醇缩醛

Synthesis of Benzaldehyde Glycol Acetal by the Modified Expandable Graphite under Microwave Irradiation

摘要:

摘要：以改性可膨胀石墨为催化剂，微波辐射下制备了苯甲醛乙二醇缩醛。通过正交实验考察了合成苯甲醛乙二醇缩醛的影响因素。结果表明，当n(苯甲醛):n(乙二醇) =1:2.5，催化剂占反应物总质量的2.04%，微波辐射功率300W，辐射时间20min，带水剂环己烷6mL时，缩醛的收率可达87.6%；并且催化剂重复使用4次后活性基本不变。通过对催化剂进行SEM和XRD测试表明，H2SO4分子已插入到石墨层中形成层间化合物。

Abstract:

Abstract: Modified expandable graphite was prepared and used in the synthesis of benzaldehyde glycol acetal under microwave irradiation. The factors were investigated through orthogonal experiment. The optimum conditions were as follows: molar ratio of benzyladehyde to glycol 1:2.5, mass ratio of the catalyst to the total reactants 2.04%, microwave irradiation power 300W, irradiation time 20.0 min, and the amount of cyclohexane was 6mL, the yield of acetal reached 87.6%; and the activity of the catalyst remains basically unchanged after used 4 times. The catalyst was studied by SEM and XRD, which showed that interlayer compound was instituted by sulfuric acid molecules inserting the graphite’s layers.