Solvent recyclability in a multistep direct liquefaction process
- Univ. of North Dakota, Grand Forks, ND (United States)
Direct liquefaction research at the Energy & Environmental Research Center (EERC) has, for a number of years, concentrated on developing a direct liquefaction process specifically for low-rank coals (LRCs) through the use of hydrogen-donating solvents and solvents similar to coal-derived liquids, the water/gas shift reaction, and lower-severity reaction conditions. The underlying assumption of all of the research was that advantage could be taken of the reactivity and specific qualities of LRCs to produce a tetrahydrofuran (THF)-soluble material that might be easier to upgrade than the soluble residuum produced during direct liquefaction of high-rank coals. A multistep approach was taken to produce the THF-soluble material, consisting of (1) preconversion treatment to prepare the coal for solubilization, (2) solubilization of the coal in the solvent, and (3) polishing to complete solubilization of the remaining material. The product of these three steps can then be upgraded during a traditional hydrotreatment step. The results of the EERC`s research indicated that additional studies to develop this process more fully were justified. Two areas were targeted for further research: (1) determination of the recyclability of the solvent used during solubilization and (2) determination of the minimum severity required for hydrotreatment of the liquid product. The current project was funded to investigate these two areas.
- Research Organization:
- USDOE Pittsburgh Energy Technology Center (PETC), PA (United States)
- DOE Contract Number:
- FG22-94PC94050
- OSTI ID:
- 198259
- Report Number(s):
- CONF-9508133-; ON: DE96001664; TRN: 95:008316-0011
- Resource Relation:
- Conference: Coal liquefaction and gas conversion contractor review meeting, Pittsburgh, PA (United States), 29-31 Aug 1995; Other Information: PBD: [1995]; Related Information: Is Part Of Coal liquefaction and gas conversion contractors review conference: Proceedings; PB: 733 p.
- Country of Publication:
- United States
- Language:
- English
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