Removal of sulfur from coal by treatment with hydrogen. Phase I. The effect of operating variables and raw material properties. Research and development report No. 77, interim report No. 1
The purpose of this investigation was to determine which process variables had a significant effect on the desulfurization of coal by hydrogen treatment at reaction temperatures of 325 and 4OO deg C; pressures of 600 and 1200 psig; reaction times of 7.5 and 15 min; solvents of anthracene and tetralin; and solvent-to-coal ratios of 3/1 and 4.5/1. A coal- solvent slurry was reacted with hydrogen at elevated temperatures and pressures in a batch autoclave rocking bomb reactor. Four different raw coals (two bituminous and two sub-bituminous) were tested. Both solvent type and temperature were found to be very highly significant variables (99% confidence level) in the solvent refining process for the desulfurization of coal. Some significance (90% confidence level) of the solvent-to-coal ratio was demonstrated for the subbituminous coals. Anthracene oil was found to be a better solvent for the process than tetralin since the dissolution of the coal in the anthracene was greater and the hydrogen tansfer characteristics appeared to be better in comparison to the tetralin. The tetralin solvent was totally recoverable from the solvent-refined product, while the anthracene oil was only partially recoverable (50 to 80%) since the coal was only partially depolymerized under reaction conditions investigated. Inorganic sulfur was easily removed from the raw coal by the solvent-refining technique (98%) while organic sulfur was removed to a lesser degree (81%). The degree of dissolution and depolymerization of the coal in the solvent was an important process factor for overall desulfurization. (MCW)
- Research Organization:
- Colorado School of Mines, Golden (USA)
- DOE Contract Number:
- 14-32-0001-1225
- NSA Number:
- NSA-29-020410
- OSTI ID:
- 4355110
- Report Number(s):
- NP-19947
- Resource Relation:
- Other Information: Orig. Receipt Date: 30-JUN-74
- Country of Publication:
- United States
- Language:
- English
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