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

ZHAO Qiang; LI Wei-min; CHEN Qing-lin

Volume 41 Issue 04

Apr. 2013

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Article Navigation > Journal of Fuel Chemistry and Technology > 2013 > 41(04): 463-468

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(04): 463-468.

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(04): 463-468.

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(04): 463-468.

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(04): 463-468.

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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

Received Date: 2012-10-15
Rev Recd Date: 2012-12-06
Publish Date: 2013-04-30

Abstract

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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References(17)

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