کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6632239 | 1424948 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of temperature on the solubility of Victorian brown coal in the ionic liquid DIMCARB
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
The effect of extraction temperature on the solubility of 4 Victorian brown coals (a Yallourn Woody coal and three Loy Yang lithotypes -Dark, Medium Light and Light) in the ionic liquid DIMCARB was investigated using a 100â¯mL autoclave. The solubility of coal at room temperature is in the order of Lightâ¯>â¯Mediumâ¯>â¯Darkâ¯>â¯Woody coal, but the effect of temperature on the solubility is related to coal properties. For the Woody, Dark and Medium lithotypes, with higher aromaticity, the soluble yield significantly increased with extraction temperature to 80â¯Â°C, then slightly further improved at 120â¯Â°C. Elemental analysis, FT-IR and solid 13C NMR analyses indicated that increasing temperature promoted interactions between DIMCARB and the coal and improved the solubilisation. The soluble fractions have higher H/C ratios and aliphaticities than the corresponding residue fractions and raw coals. The extraction temperature affected the distribution of pyrolysis products from the resultant solubles and residues. The solubles have high relative abundance of polycyclic compounds (including diterpenoids and triterpenoids) relative to the corresponding residues and the parent coals. However, increasing extraction temperature leads to decreasing selectivity for triterpenoids and increasing selectivity for long-chain alkanes and alkenes in the pyrolysis products of the soluble fraction. The solubles extracted at 120â¯Â°C have similar pyrolysis product distribution to the corresponding raw coals. In the case of the Light lithotype, with high aliphaticity, the highest soluble yield was obtained at room temperature. Extraction at 80â¯Â°C reduced the yield significantly, while at 120â¯Â°C, the yield slightly increased to be close to that at room temperature. For this case, the soluble fractions have lower H/C molar ratios than the corresponding residues. The relative abundance of triterpenoids in the pyrolysis products of the solubles exhibited the same trend as the soluble yield in DIMCARB versus temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fuel - Volume 216, 15 March 2018, Pages 752-759
Journal: Fuel - Volume 216, 15 March 2018, Pages 752-759
نویسندگان
Lijun Jin, Ying Qi, Alan L. Chaffee,