【摘要】 研究了在微波辐射下松香与乙醇、丁醇、戊醇的酯化反应,探索了催化剂及用量、醇酸配比(n醇:n松香)、微波功率、反应时间等因素对酯化反应的影响。结果表明:(1)催化剂对甲苯磺酸的最佳用量约为松香质量的27%～30%;(2)三种醇参加松香酯化反应的能力主要取决于空间效应,其顺序为:CH3CH2OH>CH3(CH2)2CH2OH>CH3(CH2)3CH2OH;(3)随着醇的碳链的增长,松香酯化反应的最佳反应时间延长、最佳微波功率增大、最佳醇酸配比降低;(4)酸值、酯化率的测定以及红外光谱表征说明目标产物的存在。更多还原

【Abstract】 Esterification reactions of rosin with ethanol,butanol and pentanol under microwave irradiation were studied.Effects of catalysts and their dosages,molar ratio of alcohol to rosin,microwave power,reaction time on esterification were investigated.Results were as follows:(1) the optimum dosage of catalyst p-toluenesulfonic acid was 27%～30% of the mass of rosin;(2) the esterification ability of the alcohols with rosin was mainly determined by their spatial effects as CH3CH2OH>CH3(CH2)2CH2OH>CH3(CH2)3CH2OH;(3)as the length of carbon chain of alcohols increased,the optimum reaction time and the optimum microwave power increased,however,the optimum ratio of alcohol to rosin declined slightly;(4) acid value,esterification rate and IR spectroscopy elucidated the target products.更多还原