Effect of coal hydrogenation variables on the properties and structure of the heavy residues and derived cokes from two Polish subbituminous coals

✍ Scribed by Emanuel Rusin

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 796 KB
• Volume: 68
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(89)90132-4

✦ Synopsis

Two Polish subbituminous coals, containing 76% and 82% C, were hydrogenated in a batch stirred autoclave at 400,430 and 46O"C, under 20 MPa hydrogen pressure and at contact times of 20, 60,90 and 120min, in the presence of a coal-derived recycle oil. No external catalyst was used. The filtered reaction products were vacuum distilled to achieve residues with softening points of z 100°C. The residues were characterized by ultimate composition, molecular weight, quinoline insolubles, ash content, 'H n.m.r. and i.r. analysis. Structural parameters for the average molecules of the residues were calculated. The residues were subsequently carbonized up to 510°C and the resulting 'green cokes' calcined to 1200°C. Calcined cokes were examined for their texture by optical and scanning electron microscopy. It has been shown that increase in severity of hydrogenation increases the concentration of aromatic structures in the residues and leads to increased anisotropy intensity in the derived cokes.