THERMAL-BEHAVIOR OF COALS AT TEMPERATURES AS LOW AS 100-350 DEGREES-C - HEAT-TREATMENT OF THF-INSOLUBLE EXTRACT FROM CS2-NMP MIXED-SOLVENT EXTRACTION OF ZAO-ZHUANG COAL
Shen, JL; Takanohashi, T; Iino, M
| HERO ID | 3577558 |
|---|---|
| In Press | No |
| Year | 1992 |
| Title | THERMAL-BEHAVIOR OF COALS AT TEMPERATURES AS LOW AS 100-350 DEGREES-C - HEAT-TREATMENT OF THF-INSOLUBLE EXTRACT FROM CS2-NMP MIXED-SOLVENT EXTRACTION OF ZAO-ZHUANG COAL |
| Authors | Shen, JL; Takanohashi, T; Iino, M |
| Journal | Energy and Fuels |
| Volume | 6 |
| Issue | 6 |
| Page Numbers | 854-858 |
| Abstract | Heat treatment of THF-insoluble, CS2-N-methyl-2-pyrrolidinone (NMP) mixed solvent (1:1 by volume) soluble fraction (TIMS) of the extract, which was obtained from the extraction of Zao Zhuang coal with the same mixed solvent at room temperature, was carried out in several organic solvents at 100-350-degrees-C under N2 atmosphere. Retrogressive reaction of TIMS, i.e., its conversion to the mixed solvent-insoluble fraction (MI), was observed in tetralin (TET), naphthalene (NAP), and 9,10-dihydrophenanthrene (DHP) at temperatures as low as 100 and 175-degrees-C, while MI formation at 175-degrees-C was suppressed by adding 9,10-dihydroanthracene (DHA) or 1,4,5,8,9,10-hexahydroanthracene (HHA), which are much stronger hydrogen donors than TET, NAP, or DHP. Moreover, by these treatments, the THF-soluble fraction (TS), the lighter fraction than TIMs, was formed from TIMS. The quantity of hydrogen transferred from the solvents to TIMS and/or TIMS moieties was found to be well correlated with the quantity of MI formed. By a similar heat treatment in DHA at 175-degrees-C, Zao Zhuang raw coal was found to undergo dissolution reactions, i.e., the increase of TS and the decrease of MI, compared with those originally existing in the raw coal. The mechanism of the MI formation and its suppression during the heat treatments of TIMS at low temperatures is discussed. |
| Doi | 10.1021/ef00036a024 |
| Wosid | WOS:A1992JZ35200024 |
| Url | <Go to ISI>://WOS:A1992JZ35200024 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Language Text | English |