Cross-linking a soluble lignin by a coal demineralization treatment
Conference
·
OSTI ID:654017
The standard coal demineralization procedure of Bishop and Ward, a modification of earlier work of Radmacher and Mohrhauer. is a strong acid treatment (consecutive exposure of the ground coal to 5N HCl, 48% HF, and 12N HCl, for 45 minute periods at 60 C) that effectively reduces the mineral matter concentration of the coal. The Bishop and Ward paper compared the determination of mineral matter in coals by direct and indirect methods and assessed the applicability of the mineral matter determination to British Coals. The work was oriented toward mineral matter determination and did not address, in detail, the organic matrix of the coal. On the basis of pre- and post-extraction carbon and hydrogen determinations, the authors concluded that the acid treatment caused no significant attack on the coal substance. The present study was undertaken to test whether the exposure of a complex, water insoluble organic matrix containing benzylic alcohol functionality would suffer retrogressive polymerization when exposed to the Bishop and Ward demineralization conditions. This paper reports solubility and structural changes in lignin, a model for the organic matrix of low rank coals, that demonstrate the facility of this reaction channel.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States)
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 654017
- Report Number(s):
- ORNL/CP--98210; CONF-980812--; ON: DE98005711; BR: KC0302010
- Country of Publication:
- United States
- Language:
- English
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