Efficient liquefaction of Australian brown coal with a hydrogen-donating solvent under atmospheric pressure
✍ Scribed by Isao Mochida; Yuji Moriguchi; Yozo Korai; Hiroshi Fujitsu; Kenjiro Takeshita
- Publisher
- Elsevier Science
- Year
- 1981
- Tongue
- English
- Weight
- 225 KB
- Volume
- 60
- Category
- Article
- ISSN
- 0016-2361
No coin nor oath required. For personal study only.
✦ Synopsis
Letters to the Editor
The contact angles of brown coals are plotted with their oxygen content in Figure 2, where a fair rectilinear relation is observed. The two kinds of coals can bc classified on the basis of their atomic ratio O/C. The higher value of O/C > 0.15 of brown coal may imply a higher content of surface oxygen groups which are hydrophilic and, therefore, decrease the contact angles. In contrast, small number of oxygen groups on the bituminous surface may be unimportant, whereas hydrophobic CH groups may increase the contact angle. Thus, the surface properties of coals which can be estimated by the bulk analysis may govern their wettability.
An ash yield of < 100,:) hardly influences the contact angle of the coal.