Citation: ZHAO Qiang, LI Wei-min, CHEN Qing-lin. Synthesis of poly(oxymethylene) dimethy ethers catalyzed by Brønsted acid ionic liquids[J]. Journal of Fuel Chemistry and Technology, ;2013, 41(4): 463-468. shu

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

1.
1. School of PetroChemical Engineering, Changzhou University, Changzhou 213164, China;

Corresponding author: LI Wei-min,
Received Date: 15 October 2012
Available Online: 6 December 2012
Fund Project: 江苏省精细石油化工重点实验室开放课题(KF0808) (KF0808) 江苏省科技厅工程技术中心建设项目(BM2010095, BM2010132). (BM2010095, BM2010132)

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_3~8 reached 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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