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Vol. 27 No. 6 (2015): Vol 27 Issue 6

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Synthesis of Polyoxymethylene Dimethyl Ethers Catalyzed by Rare Earth Compounds

https://doi.org/10.14233/ajchem.2015.17822
Gao-Feng Shi
School of Petro-chemical Engineering, Lanzhou University of Technology, Lanzhou 730000, Gansu Province, P.R. China
Jian Miao
School of Petro-chemical Engineering, Lanzhou University of Technology, Lanzhou 730000, Gansu Province, P.R. China
Guo-Ying Wang
School of Petro-chemical Engineering, Lanzhou University of Technology, Lanzhou 730000, Gansu Province, P.R. China
Jin-Mei Su
School of Petro-chemical Engineering, Lanzhou University of Technology, Lanzhou 730000, Gansu Province, P.R. China
Hai-Xiao Liu
School of Petro-chemical Engineering, Lanzhou University of Technology, Lanzhou 730000, Gansu Province, P.R. China

Corresponding Author(s) : Gao-Feng Shi

gaofengshi_lzh@163.com

Asian Journal of Chemistry, Vol. 27 No. 6 (2015): Vol 27 Issue 6

Abstract

Polyoxymethylene dimethyl ethers (PODMEn) have been synthesized in moderate yields by the reaction of methylal (PODME1) and paraformaldehyde catalyzed by rare earth compounds. The activities of catalyst in the reaction were investigated and the results show that La3+/SO42- has a high value. The influencing factors of reaction such as catalyst amount, reaction temperature, time, pressure and mole ratio of methylal (PODME1) to paraformaldehyde were also investigated. The appropriate reaction conditions i.e., n(paraformaldehyde)/n(methylal) = 1.60, catalyst amount of 1 %, 130 °C, 6 h and 0.5 MPa. Under the above conditions, methylal conversion rate and selectivity of PODME2-8 is 81.6 and 75.5 %, respectively. In addition to, the combustion and emission characteristics of PODME2-8 added diesel was compared with the diesel, polyoxymethylene dimethyl ethers (PODME2-8) not only improved the combustion characteristics of diesel, but improved the low temperature fluidity.

Keywords

Rare earth compounds Polyoxymethylene dimethyl ethers Methylal Paraformaldehyde
Shi, G.-F., Miao, J., Wang, G.-Y., Su, J.-M., & Liu, H.-X. (2015). Synthesis of Polyoxymethylene Dimethyl Ethers Catalyzed by Rare Earth Compounds. Asian Journal of Chemistry, 27(6), 2149–2153. https://doi.org/10.14233/ajchem.2015.17822
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