Studies in coal liquefaction with application to the SRC and related processes. Quarterly report, August-October 1982. [Deteriorated recycle solvents from coal liquefaction plants]
This report discusses work performed on a deteriorated recycle solvent obtained from the coal liquefaction pilot-plant at Wilsonville, Alabama. The solvent had a poor quality as determined by standard solvent quality tests. Four different routes were explored to upgrade the quality of the deteriorated solvent: catalytic dehydrogenation, thermal hydrotreatment, catalytic hydrotreatment using presulfided iron-oxide, and catalytic hydrotreatment using presulfided Shell 324 catalyst. Each route was investigated over a wide range of temperature. A kinetic solvent quality test was conducted on the solvents, prepared using the four different routes. The results indicated that the extent of upgrading achieved met with different levels of success for the investigated routes. Good quality solvents were obtained at reduced temperatures, far removed from typical coal liquefaction operation conditions. Moreover, the temperature range over which the maximum solvent quality was obtained, differed for both catalysts. Naphthalene hydrogenation was used as a model reaction system to provide insight about the response of solvent quality to perturbations in the reaction conditions used in catalytically hydrotreating the solvent. Observed trends in model napthalene hydrogenation studies proved useful in interpreting the data obtained for the catalytic hydrotreatment of the solvent, in the light of selective product (hydroaromatic) formation. Tetrahydroquinoline (THQ) is a known, powerful coal liquefaction solvent and was used as a reference for the improved solvents obtained in this work to ascertain the importance of the level of upgrading achieved. The solvents, prepared by thermal and catalytic hydrotreatment of the recycle solvent, have been characterized using standard analytical techniques, namely, CHN and LECO analyses, NMR Spectroscopy, GC simulated distillation, and GC analysis of gaseous products. 58 references, 43 figures, 27 tables.
- Research Organization:
- Auburn Univ., AL (USA). Coal Conversion Lab.
- DOE Contract Number:
- AC22-79ET13397
- OSTI ID:
- 5418432
- Report Number(s):
- DOE/ET/13397-16; ON: DE84004997
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COAL LIQUEFACTION PLANTS
ORGANIC SOLVENTS
PILOT PLANTS
CHEMICAL COMPOSITION
DEHYDROGENATION
HYDROGENATION
RECYCLING
REFINING
STRUCTURAL CHEMICAL ANALYSIS
SRC PROCESS
ALABAMA
CATALYSIS
COMPARATIVE EVALUATIONS
EXPERIMENTAL DATA
GAS CHROMATOGRAPHY
IRON OXIDES
NMR SPECTRA
RESEARCH PROGRAMS
SPECTROSCOPY
SULFIDATION
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMATOGRAPHY
DATA
FEDERAL REGION IV
FUNCTIONAL MODELS
INDUSTRIAL PLANTS
INFORMATION
IRON COMPOUNDS
NORTH AMERICA
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PROCESSING
SEPARATION PROCESSES
SOLVENTS
SPECTRA
TRANSITION ELEMENT COMPOUNDS
USA
010405* - Coal
Lignite
& Peat- Hydrogenation & Liquefaction
010600 - Coal
Lignite
& Peat- Properties & Composition