Hydropyrolysis of coal in a powder-particle fluidized bed

✍ Scribed by Takayuki Takarada; Tomoji Tonishi; Yuichi Fusegawa; Kayoko Morishita; Nobuyoshi Nakagawa; Kunio Kato

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 645 KB
• Volume: 72
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(93)90288-d

✦ Synopsis

Coal was pyrolysed in hydrogen in a powder-particle fluidized bed at atmospheric pressure. The coal powder was continuously fed into the bed, in which CoMo/Al,O, catalyst particles or silica sand particles were fluidized. The effect of silica sand on the secondary reactions of volatile matter was quite small, whereas CoMo/Al,O, showed high activity for the cracking of tarry materials. In the presence of CoMo/Al,O,, a hydrocarbon liquid with a narrow product distribution was obtained; the main components were light aromatic hydrocarbons such as BTX and naphthalene. The product composition was quite sensitive to the pyrolysis temperature. The yields of light aromatic hydrocarbons with CoMo/Al,O, increased with temperature to 590°C and then sharply decreased above 600°C. Maximum yields of light aromatic hydrocarbons, 7.2 wt% (BTX 5.8 wt%, naphthalene 1.4 wt%), -30 times those with silica sand, were obtained at 590°C with a bed height of 10cm. The yields of hydrocarbon gases increased with temperature; the CH, yield was 32 wt% at 650°C.