Brønsted酸性离子液体催化合成聚甲醛二甲醚的研究

赵强; 李为民; 陈清林

Brønsted酸性离子液体催化合成聚甲醛二甲醚的研究

1.
常州大学石油化工学院, 江苏常州 213164;
2.
中山大学化学与化学工程学院, 广东广州 510275

基金项目: 江苏省精细石油化工重点实验室开放课题(KF0808); 江苏省科技厅工程技术中心建设项目(BM2010095, BM2010132).

详细信息

通讯作者:
李为民, Tel: 13961208268, E-mail: liweimin@cczu.edu.cn.

中图分类号: TQ519
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- 被引次数: 0
出版历程
- 收稿日期: 2012-10-15
- 修回日期: 2012-12-06
- 刊出日期: 2013-04-30

Synthesis of poly(oxymethylene) dimethy ethers catalyzed by Brønsted acid ionic liquids

1.
School of PetroChemical Engineering, Changzhou University, Changzhou 213164, China;
2.
School of Chemistry and Chemical Enginerring, Sun Yat-Sen University, Guangzhou 510275, China

摘要

摘要: 合成并表征了两种Brønsted酸性离子液体N-甲基-2吡咯烷酮硫酸氢盐([Hnmp]HSO₄)和N-甲基-2吡咯烷酮对甲苯磺酸盐([Hnmp]PTSA),对两种离子液体在由甲缩醛和多聚甲醛缩合制备聚甲醛二甲醚(DMM_n,n > 1)反应中的催化性能进行了研究.结果显示,离子液体的催化活性与其酸性相关,离子液体[Hnmp]HSO₄具有较高的催化活性;当离子液体[Hnmp]HSO₄的用量为2.0%(质量分数)、m(甲缩醛)/m(多聚甲醛)= 2.00、反应温度110℃、反应时间6 h时,甲缩醛的转化率和DMM_3~8的选择性分别为52.28%和49.18%.反应结束后,离子液体[Hnmp]HSO₄与产物自动分成两相,且该离子液体的稳定性好,重复使用五次后仍有较高的催化活性.
- 离子液体 /
- 甲缩醛 /
- 多聚甲醛 /
- 聚甲醛二甲醚
Abstract: Two kinds of Brønsted acid ionic liquids ([Hnmp]HSO₄, [Hnmp]PTSA) were synthesized and characterized; their catalytic activity in the synthesis of poly(oxymethylene) dimethyl ethers (DMM_n, n > 1) by the condensation of dimethoxy methane (DMM) and paraformaldehyde (PF) were also investigated. The results showed that the catalytic activity of ionic liquid was related to its acidity, [Hnmp]HSO₄ has higher catalytic activity; the optimum reaction conditions were found as [Hnmp]HSO₄ amount of 2.0%(mass fraction), feed mass ratio m(DMM)/m(PF) of 2.00, temperature 110℃ and reaction time 6 h, the conversion of DMM and selectivity to DMM_3~8reached 52.28% and 49.18%, respectively. The ionic liquid [Hnmp]HSO₄ can be naturally separated from product phase and exhibits high stability upon reusage; it still remained highly active even after being reused for five times.
- ionic liquid /
- dimethoxy methane /
- paraformaldehyde /
- poly(oxymethylene) dimethy ethers

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参考文献(17)

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