✦ LIBER ✦

Oxidation studies on coking coal related to weathering. 3. The influence of acidic hydroxyl groups, created during oxidation, on the plasticity and dilatation of the weathered coking coal

✍ Scribed by Boleslaw S. Ignasiak; Adam J. Szladow; Douglas S. Montgomery

Publisher: Elsevier Science
Year: 1974
Tongue: English
Weight: 650 KB
Volume: 53
Category: Article
ISSN: 0016-2361
DOI: 10.1016/0016-2361(74)90025-8

No coin nor oath required. For personal study only.

✦ Synopsis

A high-volatile bituminous coal possessing a high Gieseler fluidity and large dilatation was subjected to slight oxidation in air under chosen conditions. The resultant 'oxycoal'was treated with various chemical reagents in order to determine to what extent the original caking properties of this coal, as measured by Gieseler fluidity and dilatation, could be restored. Treatment with aqueous barium hydroxide or barium acetate solutions succeeded in doing so to a considerable degree. tt is tentatively concluded that certain acidic hydroxyl groups formed in the course of oxidation are indirectly responsible for the deterioration of fluidity and dilatation -possibly via condensation reactions involving the hydroxyl groups -during subsequent pyrolysis of oxycoal. The presence of carboxyl groups appears to have no effect,

📜 SIMILAR VOLUMES

Oxidation studies on coking coal related

Oxidation studies on coking coal related to weathering: Part 2. The distribution of absorbed oxygen in the products resulting from the pyrolysis of slightly oxidized coking coal

✍ B.S. Ignasiak; D.M. Clugston; D.S. Montgomery 📂 Article 📅 1972 🏛 Elsevier Science 🌐 English ⚖ 578 KB

A high-volatile A bituminous coal was oxidized with 180, at 1OO'C for 72 h to simulate weathering, and subsequently pyrolysed at various temperatures to drive off C180,, C1801%, C1%,, C180, C160, Hz180, Hz'%. These gases were subsequently analysed by massspectrometry. The results indicate that 60%

Oxidation studies on coking coal related

Oxidation studies on coking coal related to weathering. 4. Oxygen linkages influencing the dilatometric properties and the effect of cleavage of ether linkages

✍ Helena M. Wachowska; Biswanath N. Nandi; Douglas S. Montgomery 📂 Article 📅 1974 🏛 Elsevier Science 🌐 English ⚖ 948 KB

Samples of a vitrinite concentrate of Balmer 10, medium-volatile bituminous coal (433) and high-volatile Moss 3 coal (535) were oxidized in air at 85°C for four days to partially destroy the swelling characteristics as measured by the Ruhr dilatometer. Similar samples were oxidized at 100°C for thre