Superacid coal chemistry. 2. Model compound studies under conditions of HF:BF3:H2 catalysed mild coal liquefaction

✍ Scribed by George A. Olah; Altaf Husain

• Publisher: Elsevier Science
• Year: 1984
• Tongue: English
• Weight: 582 KB
• Volume: 63
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(84)90351-x

✦ Synopsis

Selected model compounds representing coal structural entities were studied under the conditions of HF-BF,H, catalysed mild coal liquefaction. Bibenzyl and diphenylmethane gave near quantitative conversion at room temperature without added hydrogen. Biphenyl, however, required hydrogen pressure at 150°C and gave a conversion of only 230%. Among the model compounds containing ether linkages, dibenzyl ether and benzyl phenyl ether gave quantitative conversion at room temperature without added hydrogen. Diphenyl ether in contrast was converted (~70% yield) only under hydrogen pressure at 155°C. Sulphur-and nitrogen-containing model compounds were also studied. At 95°C in the absence of hydrogen, benzyl phenyl sulphide and dibenzyl sulphide gave over 95% conversion. On the other hand diphenyl sulphide and diphenyl disulphide required hydrogen pressure at 150°C to give conversions of z95%. Quinoline gave a conversion of 220% under hydrogen pressure at 15uC. The formation of condensation products in these conversion processes could be suppressed by the use of a good hydrogen donor, such as isopentane.