Microscopic observation of the swelling and dissolution of coal by tetralin during the early stages of hydrogenation
Microscopic observation of the swelling and dissolution of coal by tetralin during the early stages of hydrogenation
复制标题
加氢初期煤被四氢化萘溶胀和溶解的显微观察
DOI：
10.1016/0016-2361(85)90041-9
复制
发表时间：
1985
期刊：
影响因子：
7.4
通讯作者：
M. Shibaoka
中科院分区：
文献类型：
--
作者：
M. Shibaoka
为了研究镜质组在加氢初期的行为，在氢气压力(初始压力10兆帕)下，在200~350℃的温度范围内用四氢萘处理了四小块煤，然后进行了显微镜观察。在250℃以下，烟煤中的镜质组层被观察到膨胀，但在此温度以上，膨胀程度被表面溶解程度所超过。镜质体层变得疏松，并开始在300℃内溶解，这可能为四氢萘的供氢活性提供了更有利的条件。在330℃以上，剩余的镜质组开始转变为大小不一的玻璃体颗粒。它们随后的溶解速度主要由四氢灵和氢化产物的扩散控制。对于万多次烟煤和亚伦褐煤，腐殖酸凝胶在相对较低的温度(300-330℃)下溶解，残留的固体物质(玻璃纤维)随后逐渐氢化。
To investigate the behaviour of vitrinite during the early stages of hydrogenation, small blocks of four coals were treated with tetralin between 200 and 350 °C under hydrogen pressure (initial pressure 10 MPa) and then examined microscopically. Below 250 °C the vitrinite layers in the bituminous coals were observed to be swollen by this treatment, but above this temperature the degree of swelling was exceeded by the degree of surface dissolution. The vitrinite layers became porous > 300 °C and started to dissolve internally, which probably provided more favourable conditions for the hydrogen donor activity of the tetralin. Above 330 °C the remaining vitrinite began to alter to particles of vitroplast of various sizes. Their subsequent rate of dissolution was controlled mainly by the diffusion of both the tetralin and the hydrogenation products. In the case of Wandoan subbituminous and Yallourn brown coals, humic gel was dissolved at relatively low temperatures (300–330 °C) and the residual solid material (vitrofibre) was then gradually hydrogenated.