Irradiation-enhanced coal liquefaction

Thesis/Dissertation · Fri Jan 01 00:00:00 EST 1988

OSTI ID:5071568

Koh, J S

The applicability of {gamma}-ray irradiation to coal liquefaction in a synthetic recycle solvent mixtures was studied at temperatures between 300 and 400 C. The irradiation source was 11,000 C{sub i} Cobalt 60 and the dose rate was about 1.0 Mrad/hr. A 100 ml 1-in. O.D. stainless steel tubing reactor with variable speed vertical agitation was used in the research. Illinois No.6 bituminous coal, Wyodak subbituminous coal and North Dakota lignite were tested. There was no distinguishable irradiation effect on coal liquefaction below 400 C for {gamma}-irradiation up to 1.0 Mrad/hr for 1 hr, but distinguishable effects were obtained at 400 C. A well dispersed physical state was proven to be critical to improvements through irradiation. At 400 C the conversions of preasphaltenes to asphaltenes was increased 10-20% by the irradiation. Approximately 4% net oil yield was obtained by the irradiation, while no net oil yield was obtained without the irradiation. At the same time conversion to gaseous products was also increased from 6 to 10 Wt% of DMMF coal for 60 min. irradiation time. The hydrogen transfer rate from tetralin to coal-derived liquid products was increased 1.67 times by the irradiation at 400 C. Rehydrogenation of spent donor solvent was accelerated by the {gamma}-ray irradiation at or above 250 psig ambient hydrogen pressures with 2.0 Wt% iron oxide catalyst at 400 C. The relative reactivity of different rank coals was not affected by the {gamma}-ray irradiation. Decane and dodecane were tested as the substitute hydrogen source for Illinois No. 6 coal liquefaction at 350 C and 400 C respectively. The aliphatic solvents resulted in massive char formation and were not successful substitutes to the donor solvents either with irradiation or without irradiation.

• Research Organization: Michigan Univ., Ann Arbor, MI (USA)
• OSTI ID: 5071568
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL LIQUEFACTION
GAMMA RADIATION
PERFORMANCE TESTING
ASPHALTENES
BITUMINOUS COAL
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
COAL GAS
COAL LIQUIDS
COBALT 60
DECANE
DODECANE
DOSE RATES
HYDROGEN TRANSFER
HYDROGENATION
IRON OXIDES
LIGNITE
OPTIMIZATION
PROCESS SOLUTIONS
RECYCLING
SUBBITUMINOUS COAL
TETRALIN
ALKANES
AROMATICS
ASPHALTS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BITUMENS
BLACK COAL
BROWN COAL
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COBALT ISOTOPES
DISPERSIONS
ELECTROMAGNETIC RADIATION
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
GASES
HYDROCARBONS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IONIZING RADIATIONS
IRON COMPOUNDS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
KINETICS
LIQUEFACTION
LIQUIDS
MATERIALS
MINUTES LIVING RADIOISOTOPES
MIXTURES
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RADIATIONS
RADIOISOTOPES
REACTION KINETICS
SOLUTIONS
TAR
TESTING
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
YEARS LIVING RADIOISOT
YIELDS
010405* - Coal
Lignite
& Peat- Hydrogenation & Liquefaction