Optical properties of carbonized vitrinites

✍ Scribed by D. Chandra

• Publisher: Elsevier Science
• Year: 1972
• Tongue: English
• Weight: 125 KB
• Volume: 51
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(72)90045-2

✦ Synopsis

calls for comment to clear away certain misunderstandings.

These authors remark 'The present results indicate that vitrinifes of the same level of rank as those studied by R. L. Bond, D. Chandra and I. G. C. Dryden', which were suggested as being isotropic and remaining so during carbonization, are in fact anisotropic and show an increased ordering of the aromatic lamellae after pyrolysis'. This statement appears to be misleading because of the undermentioned facts.

Bond, Chandra and Dryden' studied three coals: (1) Penrikyber (C 92-O%, H 4*2%), (2) Ashton Moss Roger (C 84*6%, H 5.1%) and ( ) Thorne Hazel coal (C 83*6%, H 503%). They stated that the high-rank coal (Penrikyber) was anisotropic, the anisotropy increasing with increasing temperature, while the two low-rank coals (Thorne Hazel and Ashton Moss. Roger) remained almost isotropic at * The high-rank Pemikyber coal used by Bond, Chandra and Dryden? was not an anthracite. It had only 92.0% carbon, and too high a hydrogen content (4.