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Two typical types of bituminous coal (JN and SH) were employed for thorough devolatilization, then the samples were functionalized by O2 at 1073K to different conversion ratios (JN: 0.21, 0.34, 0.40, 0.53 and 0.63; SH: 0.15, 0.22, 0.32, 0.42 and 0.52) before the surface oxygen containing complexes C(O) were qualitatively and semi-quantitatively characterized by Fourier transform infrared spectroscopy...
A comprehensive and systematic study on the fundamental pyrolysis behaviors of a single coal particle was performed in this study. The pyrolysis characteristics of coal was investigated by non-isothermal thermo gravimetric analysis whereas the reaction kinetic parameters were obtained by using the distribute activation energy model (DAEM). As three heating rate profiles were applied (10, 20 and 30°C/min)...
The recoverable resource of shale gas is 25 trillion cubic meter, 33% of which is stored in transitional shales in China. This work investigates the effects of organic and inorganic compositions on the development of Upper Paleozoic transitional shale pore structures through a combination of petrophysical and geochemical measurements. 42 shale samples were collected from marsh-lagoon and coastal delta...
The products in the water-soluble portion from mild oxidation of Jincheng No. 15 anthracite in aqueous hydrogen peroxide were analyzed with a gas chromatograph/quadrupole time-of-flight-mass spectrometer (GC/QTOF-MS) along with theoretical calculation for the first time. A series of heteroatom(s)-containing components were identified by comparing their mass spectra with NIST11 library data. Moreover,...
Liquefied dimethyl ether (DME) was used for moisture and bio-crude extraction in 4 common vegetal biomasses. The process removed approximately 81.3–88.7% of the water from these biomasses and yielded 5.8–16.8% bio-crude of dry weight of sample. The properties of the original samples, dewatered bio-solids, extracted bio-crude and removed water were studied by elemental analysis, gel permeation chromatography...
Shengli lignite (SL) was pretreated in H 2 O 2 aqueous solution at 40°C for 4h to obtain pretreated SL (PTSL). Both the SL and PTSL were oxidized in NaOCl aqueous solution at 30 o C for 5h to investigate the effect of pretreatment (PT) on SL oxidation with NaOCl. Gas chromatography/mass spectrometry analysis shows that the PT with H 2 O 2 significantly increased...
The liquefied dimethyl ether (DME) was used to dewater the frozen brown coal under a designed experimental condition at −20°C. With this method, 98.1wt.% of the initial water was removed from the frozen brown coal. The properties of the brown coal were not changed obviously after the dewatering treatment. By means of differential scanning calorimetry measurement, it is found that the water in tested...
We propose the use of liquid dimethyl ether (DME) as a solvent for extracting hydrocarbons and lipids from Botryococcus braunii Race B paste. The extraction yields and main elements of the extracts obtained from the B. braunii by our technique is nearly the same as by hexane Soxhlet extraction on dried mass. A qualitative analysis by silica gel thin layer chromatography suggested that DME also effectively...
Recently, the authors proposed a simple method for the extraction of lipid from high-moisture microalgae by using dimethyl ether (DME) without drying, cell disruption, and heating of the extractant. Herein, the versatility of this method was evaluated using several species of natural blue–green microalgae. Direct extraction of lipids from various species of high-moisture microalgae was successfully...
By using dimethyl ether as extractant, the green crude was successfully extracted from high-moisture natural blue-green microalgae (91.0% of water content) with a high extraction capacity at 40.1% of dry weight of the microalgae. Compared with previous methods, this method combined drying, cell description, and solvent extraction in one step.
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