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Dimethyl ether; Direct oxidation; VOx/H-beta; Polyoxymethylene dimethyl ethers. Introduction. Polyoxymethylene dimethyl ethers (DMMx) have attracted intensive research interest because of their promising properties, such as excellent environmental friendly solvent with low toxicity, low boiling point, good solubility, and the high oxygen .
Oct 01, 2013· Abstract: Polyoxymethylene dimethyl ethers (DMM n) were synthesized in moderate yields by the reaction of methylal and paraformaldehyde catalyzed by solid acid.The pure components of DMM 2, DMM 3, DMM 4, and DMM 5 obtained by rectification were characterized by 1 H NMR and mass spectra. The suitable components for blending into fuel were obtained by distillation separation.
Polyoxymethylene dimethyl ethers are promising additives for tailoring clean diesel fuels and have attracted wide interests. Cold-flow properties are also so important because diesel fuels would freeze at temperatures lower than freezing point leading to engine-attack of internal combustion engines.
Feb 23, 2016· The method for producing polyoxymethylene dimethyl ethers according to claim 1, wherein in the synthetic reaction process, a concentration of the solid acid catalyst in the fluidized bed reactor is 5%˜30% by weight, operation temperature is 30-120° C., operation pressure is 0.1˜1 MPa, reaction time is 0.5˜6 hours.
Nov 15, 2017· Polyoxymethylene dimethyl ethers (OME) containing 3–5 CH 2 O units . The ratio of Brønsted to Lewis acid sites increases from 0.9 to 5.8 with an increase in the Si/Al molar ratio from 56 to 560, corresponding also to a decrease from 47.3 to 0.2 wt% of methyl formate selectivity. At too high Si/Al ratio, the catalytic activity started to .
Polyoxymethylene dimethyl ethers (PODE or DMMn) are a class of chemical compounds with the molecular formula H 3 CO(CH 2 O) n CH 3 where n is typically about 3 to 8. PODE can be produced from methylal and formaldehyde or a formaldehyde equivalent such as paraformaldehyde or trioxane.
The present invention is by methylal with paraformaldehyde as raw materials, methylal: paraformaldehyde mass ratio of 0.5 to 10:1, at a reaction temperature of 70 ~ 200 ℃, a reaction pressure of 0.2 ~ 6MPa conditions, feed and catalyst prepared by catalytic reaction occurs polyoxymethylene dimethyl ether, the amount of catalyst is 0.1% to 5.0 .
Polyoxymethylene dimethyl ethers (PODE) was blended in diesel at volume ratios of 0 %, 10 %, 20 %, and 30 % (denoted as P0, P10, P20, and P30). The experimental study was carried on an unmodified .
The present invention relates to the field of chemical engineering and technology, in particular relates to the sub-field of synthesis of high quality alternative liquid fuel for engines from non-petroleum based feedstock, more particularly relates to a method for adjusting, controlling and optimizing the synthetic process of polyoxymethylene dimethyl ethers by utilizing chemical thermodynamic .