04/02212 Analysis of group composition in product from coprocessing of coal and petroleum residues by gas-liquid chromatography: Zhang, C. et al. Fenxi Shiyanshi, 2003, 22, (2), 24–26. (In Chinese)
- Publisher
- Elsevier Science
- Year
- 2004
- Weight
- 167 KB
- Volume
- 45
- Category
- Article
- ISSN
- 0140-6701
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✦ Synopsis
01 Solid fuels (economics, business, marketing, policy) the arsenic distribution in the coal have significant effect on the pyrolysis behaviour of arsenic. The different volatility of arsenic was attributed to its chemical stability and thermal stability. Ion exchangeable arsenic and the arsenic bound to carbonates are not present in the three coals. Other arsenic forms undergo transformation during the pyrolysis, from the solid phase to the vapour phase and from one chemical form to other chemical forms. The main arsenic remained in the residue may include resistant sulfides.
Preparation 04/02212 Analysis of group composition in product from coprocessing of coal and petroleum residues by gas-liquid chromatography Zhang, C. et al. Fenxi Shiyanshi, 2003, 22, (2), 2~26. (In Chinese) A method was established that could directly detect hydrocarbon group composition of the product from coprocessing of coal and petroleum residues. The analysis method was completed by high-performance liquid chromatography combined with gas chromatography. The effect of coal type, different catalysts, different ratios of coal to petroleum residues and processing conditions on group composition in products was discussed.
04/02213 Development of aromatic ring size in bituminous coals during heat treatment in the plastic temperature range Kidena, K. et al. Fuel Processing Technology, 2004, 85, (8-10), 827-835. Among the many complicated chemical and physical changes occurring in coal in the plastic temperature range, the authors focused on the changes in the size of poly-condensed aromatic rings since the aromatic moieties are believed to play a role in governing the plastic phase. Three Argonne premium coal samples, Upper Freeport, Pittsburgh No. 8 and Illinois No. 6 coals, were employed in the present study. The average size of the aromatic rings for coal and heat-treated coal (semicoke) was evaluated by solid-state NMR measurements; the results strongly indicated that the development tendency of the aromatic ring size for the semi-coke samples was different among the three coals. A mechanistic view of the plastic phenomena of coals is discussed with the assistance of the weight loss during heat treatment, and the amount of transferable hydrogen in coal or semi-coke samples. Kuznetsov, P. N. et al. Khimiya Tverdogo Topliva (Moscow, Russian Federation), 2003, 2, 63-70. (In Russian) The effect of the ionization treatment of brown and hard coals by accelerated electron beam on the composition, supramolecular structure, and reactivity during thermochemieal conversion into lowmolecule-weight products was studied. It was shown the irradiation of brown coal leads to a substantial change in X-ray parameters, swelling in tetrahydrofuran (THF), and the product yield during its hydrogenation. Hard coal was relatively resistant to the action of accelerated electrons.
04/02214 Effect of accelerated electrons on transformations of brown and hard coals