Chemistry of hydrogen sulphide under coal liquefaction conditions: 2. Synergistic effects of H2S and the mixed solvent system tetralin and tetrahydroquinoline on liquefaction of a moderately reactive coal
✍ Scribed by Albert S. Hirschon; Richard M. Laine
- Publisher
- Elsevier Science
- Year
- 1985
- Tongue
- English
- Weight
- 538 KB
- Volume
- 64
- Category
- Article
- ISSN
- 0016-2361
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✦ Synopsis
A preliminary study was undertaken to evaluate the effects of mixed solvents and added H,S on the overall conversions of a moderately reactive coal (Wyodak-2) as defined by tetrahydrofuran solubility. Conversion efficiencies were measured as a function of time and of H,S concentration in the H,S-tetrahydroquinoline (THQ) solvent system. The specific solvent systems studied included tetralin and mixtures of tetralin and THQ, with and without H,S. In all cases, coal conversion was enhanced by the presence of H,S, THQ or both, relative to the use of tetralin alone. Conversion as a function of THQ concentration was also determined. The relative abilities of the various combinations to effect conversion were found to be as follows: tetralin < 5 wt% THQ-tetralin < 3 wt% H,S-tetralin < 10 wt% THQ-tetralin = 20 wt% THQ-tetralin < 3 wt% Hz!%20 wty,L THQ-tetralin. From these results, it is concluded that both H,S and THQ operate synergistically to provide enhanced yields of high-quality coal liquids. The relations between conversion, H,S concentration and nitrogen incorporation are discussed.