Dimethyl ether (DME) is considered an alternative hydrogen carrier with potential use in fuel cells and automotive domestic applications. hydrolysis to methanol a thermodynamically limited reaction catalyzed by solid-acid catalysts, mainly Al2O3 zeolites. Moreover, it the rate-limiting step of DME steam reforming reaction, which employed for production cell feeding. In present study, performanc...

A series of catalysts based on hybrid intergrowth structure zeolites MFI-MEL, MFI-MTW, and MFI-MCM-41 are studied in the reaction olefins synthesis from dimethyl ether at atmospheric pressure a temperature 340 °C. The total acidity zeolite-based is shown to correlate with their activity. However, use zeolite MFI-MCM-41, which characterized by high content medium acid sites, additionally catalyz...

A new aporphine alkaloid, 7-epi-duguetine (1) together with one known alkaloid, dicentrinone (2), and four known flavonoids, quercetin 3,7-dimethyl ether 3′-O-α-L-rhamnopyranosyl-(12)-β-D-glucopyranoside (3), galangin 5-methyl ether (4), 5,7-dimethoxy-3-hydroxyflavone (5), and 3,5,7-trimethoxyflavone (6), were isolated from the leaves of Dasymaschalon acuminatum, a new plant species which has ...

We present energy and carbon balances and cost estimates based on detailed Aspen Plus process simulations for five plant designs to co-produce dimethyl ether (DME) and electricity from coal. Four of the designs include capture of CO2 for long-term underground storage. We also illustrate the potential DME offers for reducing emissions by facilitating a shift to more energy-efficient vehicles.

The structures of cervinomycins A1 (1) and A2 (2), a potent anti-anaerobic and anti-mycoplasmal antibiotic were investigated by means of recent NMR techniques of O-methyl ether (3) and C,O-dimethyl ether (4) obtained by methylation of 2 with CH3I in the presence of Ag2O. The antibiotic 2 posesses a polycyclic structure involving a xanthone skeleton. The structure of 1 was confirmed to be a hydr...

We present an all atom potential energy function for the simulation of proteins and nucleic acids. This work is an extension of the CH united atom function recently presented by S. J. Weiner et al. (J . Amer. Chem. SOC., 106,765 (1984). The parameters of our function are based on calculations on ethane, propane, n-butane, dimethyl ether, methyl ethyl ether, tetrahydrofuran, imidazole, indole, d...

Methyl Cellosolve (the monomethyl ether of ethylene glycol) has been widely used as the organic solvent in ninhydrin reagents for amino acid analysis; it has, however, properties that are disadvantageous in a reagent for everyday employment. The solvent is toxic and it is difficult to keep the ether peroxide-free. A continuing effort to arrive at a chemically preferable and relatively nontoxic ...