Catalytic isomerization of α-terpineol to 1,8-cineole in supercritical carbon dioxide

被引：0
|
作者：
Hong Y. [1 ]
Wang D. [1 ]
Li Z. [1 ]
Xu Y. [1 ]
Wang H. [1 ]
Su Y. [1 ]
Peng L. [1 ]
Li J. [1 ]
机构：
[1] College of Chemistry and Chemical Engineering, Xiamen University, Xiamen
来源：
Huagong Xuebao/CIESC Journal | 2021年 / 72卷 / 07期
关键词：
1,8-cineole; Diode-array detector; Polarity; Supercritical carbon dioxide; Α-terpineol;
D O I：
10.11949/0438-1157.20201838
中图分类号：
学科分类号：
摘要：
This work proposes a method for supercritical carbon dioxide to intervene α-terpineol to synthesize 1,8-cineole. In addition, the diode-array detector was employed to measure the maximum absorption wavelength of the α-terpineol/cyclohexane mixture in supercritical carbon dioxide for analysis of the relationship between the amount of carbon dioxide and the polarity of the system. The catalytic isomerization was studied by considering the effects of polarity, solvent amount, and carbon dioxide pressure. The plausible mechanism for isomerization of α-terpineol to 1,8-cineole by phosphotungstic acid/poly(ionic liquid) (PW/PIL) in supercritical carbon dioxide was proposed. This work offers a novel green and efficient supercritical technique for the synthesis of 1,8-cineole. In supercritical carbon dioxide, 89.3% conversion of α-terpineol and 54.6% selectivity to 1,8-cineole were obtained with the mass ratio of cyclohexane to α-terpineol 10:1 and the molar ratio of PW/PIL catalyst to α-terpineol 0.0163:1, at 19.0 MPa, 50℃ for 8 h. The results showed that supercritical carbon dioxide as co-solvent expanded the applied solvent as well as reducing the polarity of the system; therefore, the catalyst aggregation was alleviated obviously, and as a result the selectivity of 1,8-cineole was increased. © 2021, Chemical Industry Press Co., Ltd. All right reserved.
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页码：3680 / 3685
页数：5
相关论文
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