Kinetics of short contact time coal liquefaction

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1982

OSTI ID:6563386

Abichandani, J S

The liquefaction kinetics of a bituminous coal (Powhatan number 5 mine coal) and a subbituminous coal (Belle Ayr coal), in the presence of a hydrogen donor solvent and at short contact times (up to 10 minutes) was examined in a gradientless reactor. The products are classified as oils, asphaltenes and preasphaltenes. The statistical fractional design of experiments was adopted to determine the effect of five operating parameters, viz. temperature, nature of gas phase, solvent to coal ratio, initial coal particle size distribution and total pressure, on coal conversion, from the standpoint of selectivity and yield of the soluble products. The effect of shear rate, hydrogen donating capacity of the solvent and type of coal was also examined. In the initial stages of liquefaction an effective loss of oil was observed, when a poor hydogen donating solvent was used. The temperature (573-723 K) and solvent to coal ratio (1.2-5) had significant effects on the product distribution. Belle Ayr coal gives more asphaltenes than Powhatan coal. There was no effect of the type of coal on the conversion measured in terms of pentane and tetrahydrofuran solubles. A lumped kinetic model is presented to describe the product distribution. This single model adequately predicts the product distribution for the different types coals and solvents used in this study.

• OSTI ID: 6563386
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
ASPHALTENES
ASPHALTS
BITUMENS
BITUMINOUS COAL
BLACK COAL
CARBONACEOUS MATERIALS
CHEMICAL REACTION KINETICS
CHEMICAL REACTORS
COAL
COAL LIQUEFACTION
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROGEN
KINETICS
LIQUEFACTION
MATERIALS
NONMETALS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
REACTION KINETICS
SUBBITUMINOUS COAL
TAR
THERMOCHEMICAL PROCESSES