Short contact time liquefaction of subbituminous coal

Technical Report · Sun Jul 01 04:00:00 EDT 1984

OSTI ID:6790034

This report describes a series of continuous unit studies determining how pyrite addition, as well as other variables (including solvent quality, slurry recycle, temperature, residence time), affect the short contact time liquefaction of subbituminous coal. Dissolution of low-rank coal is much more strongly affected by pyrite addition than by solvent quality. Mild hydrotreatment of an SRC I solvent provided a solvent which increased conversion only slightly over that achieved with the original SRC I solvent. Addition of pyrite or pyrrhotite, however, resulted in a significant improvement in conversion. The low quality solvent was SRC I solvent while the high quality solvent was from the Lummus Integrated Two-Stage Liquefaction Process. Essentially identical conversions were obtained with the high quality and low quality solvents. Pyrite brought about the same significant improvement in conversion in each of the solvents. Although use of a lower level of a higher quality catalyst (CoMo/Al/sub 2/O/sub 3/) increased hydrogenation and increased conversion of SRC to distillate more effectively than pyrite, the pyrite was more effective in decreasing the insoluble organic matter yield. Conversion was also increased by partial slurry recycle; i.e., by recycling a fraction of the dissolver effluent (containing SRC, insoluble organic matter and mineral matter) mixed with an equal amount of distillate in place of all distillate solvent of the normal short contact time SRC I process. Over the ranges investigated, conversions increased with increasing temperature or residence time. These increasing conversions were generally accompanied by increasing hydrogen consumption and/or hydrocarbon gas make.

• Research Organization: Gulf Research and Development Co., Shawnee Mission, KS (USA)
• DOE Contract Number: AC22-82PC50001
• OSTI ID: 6790034
• Report Number(s): DOE/PC/50001-28; ON: DE85001160
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
CARBONACEOUS MATERIALS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COAL LIQUEFACTION
COAL RANK
CONSUMPTION RATES
DATA
ELEMENTS
ENERGY SOURCES
EXPERIMENTAL DATA
FOSSIL FUELS
FUELS
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
HYDROGENATION
INFORMATION
IRON COMPOUNDS
IRON SULFIDES
LIQUEFACTION
MATERIALS
MINERALS
NONMETALS
NUMERICAL DATA
ORGANIC SOLVENTS
PARAMETRIC ANALYSIS
PETROGRAPHY
PYRITE
PYRRHOTITE
SOLVENTS
SRC-II PROCESS
SUBBITUMINOUS COAL
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
TIME DEPENDENCE
TRANSITION ELEMENT COMPOUNDS