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| 丙酮缩甘油的制备及其动力学研究 |
| Preparation of solketal and its kinetics |
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| DOI： |
| 中文关键词: 丙酮缩甘油 缩合反应 动力学 |
| 英文关键词:solketal condensation reaction kinetics |
| 基金项目: |
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| 中文摘要: |
| 将生产生物柴油产生的副产物甘油加工成高附加值的丙酮缩甘油可以提高生物柴油的经济效益。采用干燥剂原位除水法，在无溶剂体系中，丙酮与甘油通过原位除水、酸催化缩合反应制备丙酮缩甘油。通过正交实验考察了丙酮与甘油摩尔比、催化剂用量、反应温度、反应时间对丙酮与甘油缩合反应的综合影响，并探讨了缩合反应动力学。在催化剂用量为每摩尔丙酮3 g、反应温度80℃、反应时间1.0 h、丙酮与甘油摩尔比1∶1.4的条件下，丙酮转化率达到87.80%。该缩合反应为准二级反应，活化能Ea为35.58 kJ/mol，频率因子为5.657×106。 |
| 英文摘要: |
| The economics of biodiesel could be improved if value-added products such as solketal was produced from by-product glycerol. In situ drying agent had been employed to increase the yield of solketal synthesized by the condensation reaction of acetone and glycerol catalyzed by acid in a solvent-free system. An orthogonal experiment was performed to evaluate the effects of molar ratio of acetone to glycerol, catalyst dosage, reaction temperature and reaction time on the condensation reaction of acetone and glycerol. Besides, the kinetics of condensation reaction was discussed. Under the conditions of reaction temperature 80℃, reaction time 1.0 h, molar ratio of acetone to glycerol 1∶1.4 and catalyst dosage 3 g per molar acetone, the conversion rate of acetone could achieve 87.80%. The kinetics analysis showed that the condensation reaction was pseudo-second-order reaction and the activation energy and frequency factor were 35.58 kJ/mol and 5.657×106, respectively. |
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