Citation: KANG Mei-rong, SONG He-yuan, JIN Fu-xiang, CHEN Jing. Synthesis and physicochemical characterization of polyoxymethylene dimethyl ethers[J]. Journal of Fuel Chemistry and Technology, ;2017, 45(7): 837-845. shu

Synthesis and physicochemical characterization of polyoxymethylene dimethyl ethers

KANG Mei-rong ¹ ,
SONG He-yuan ^1,2 ,
JIN Fu-xiang ^1,2 ,
CHEN Jing ^1,*,,

1.
State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: CHEN Jing, chenj@licp.cas.cn.
Received Date: 30 March 2017
Revised Date: 12 May 2017

Fund Project: the National Natural Science Foundation of China 21473225

Figures(6)

Polyoxymethylene dimethyl ethers (H₃CO(CH₂O)_nCH₃, PODE_n or DMM_n, n ≥ 2) with unique physical and chemical properties are a potential additive for diesel fuels, which can effectively enhance the combustion efficiency and reduce the emission of pollutants. In this work, a series of pure PODE_n components (n=2-5) were synthesized from methylal and trioxymethylene and obtained with high purity through collaborative separation; their structure and properties were characterized by NMR, FT-IR, Raman, and DFT calculation and a detailed assignment of the expressions in the spectrogram to the various groups was performed. The density and viscosity of PODE_n were measured at 298.15-323.15 K. The results indicate that the density and viscosity of PODE_n decrease gradually with the increase of temperature. Meanwhile, with the increase in the number of -CH₂O-units (n) from 2 to 5, the density, viscosity, flash point, pour point, and the heat of fusion and solidification of PODE_n are all increased. These results are valuable for the practical synthesis and application of PODE_n.
- polyoxymethylene dimethyl ethers,
- synthesis,
- structural characterization,
- physicochemical property
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