Extraction of coal at 300 to 350 C to produce precursors for chemicals
Extraction of coal at 300 to 350 C to produce precursors for chemicals
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发表时间：
1998-12
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通讯作者：
K. Miura;M. Shimada;K. Mae
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作者：
K. Miura;M. Shimada;K. Mae
6种Argonne优质煤和1种澳大利亚褐煤(Morwell)在200~400℃、压力为10 Mpa的四氢呋喃或1-甲基萘的流动中被萃取，以考察煤在液体中的增溶/解聚行为。使用流动溶剂使萃取物与煤的大分子网络之间的二次反应最小化。发现4种烟煤和亚烟煤在350℃时未分解，抽提物的产率在350℃时达到65%~80%，抽提物在室温下分为约30%~40%的可溶组分(可溶)和约40%的固体组分(在室温下沉淀)。通过元素分析、固体核磁共振、凝胶渗透色谱(GPC)和基质辅助激光解吸电离飞行时间质谱仪(MALDI-TOFMS)对可溶物、沉淀物和残留物的详细分析，使匹兹堡8号(匹兹堡8号)的结构得到了详细的研究。原煤由小客体分子(M{subw}=130~600)和大主体分子(M{subw}=1,300~3,500)组成。可溶性只由客体分子组成，但客体分子和主体分子都参与了沉淀和更多的残留物。结果表明，对于烟煤来说，采用这种萃取法可以有效地将煤分离成不同分子大小的馏分，并能有效地从低阶煤中回收大量的萃取物。以20%至40%的得率获得的可溶物分子组成小于400的M{subw}，而以最高40%的得率获得的沉淀物灰分很少，将被很好地用作后续转化的原料。
Six Argonne premium coals and an Australian brown coal (Morwell) were extracted in a flowing stream of either tetralin or 1-methylnaphthalene under 10 MPa at 200 to 400 C to examine the solubilization/depolymerization behavior of coal in liquid phase. The flowing solvent was used to minimize the secondary reaction between the extract and the macromolecular networks of coal. Four bituminous and sub-bituminous coals were found to be extracted without decomposition at 350 C. The extract yield reached 65 to 80% for the bituminous coals at 350 C, and the extract was divided into about 30 to 40% of soluble fraction at room temperature (soluble) and about 40% of solid precipitated at room temperature (deposit). The detailed analyses of the soluble, the deposit and the residue using ultimate analysis, {sup 13}C solid NMR, GPC, and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOFMS) enabled examination of the structure of Pittsburgh No.8 (PITT) in detail. The raw PITT coal was found to consist of small guest molecules (M{sub w} = 130 to 600) and large host molecules (M{sub w} = 1,300 to 3,500). The soluble consisted of only guest molecules, but both guest and host molecules were involved in the deposit and themore » residue. The extraction method employed in this work was found to be effective to separate coal into different molecule size fractions without decomposition for bituminous coals, and is effective to recover a large amount of extract from low rank coals. The soluble, being obtained in 20 to 40% yield and consisting of molecules smaller than 400 of M{sub w}, and the deposit, being obtained in 40% yield at maximum and containing little ash, would be well utilized as raw materials for the subsequent conversion.« less