Development of a process for ash removal from coal-derived liquids based on particle distribution to an aqueous phase. Final report, March 1, 1976-June 30, 1980

Technical Report · Tue Jan 01 00:00:00 EST 1980

OSTI ID:6702707

Henry, Jr, J D

A dispersed water phase can be used to separate mineral matter from coal-derived liquids. A dispersed water phase can either be used to fully distribute the particles to that phase, to collect them at the water/oil interface, or to act as a bridging medium for further agglomeration. Extensive studies were conducted on mineral matter removal from solvent-refined coal. The mineral matter in coal-derived liquids has an asphaltic and preasphaltic coating which dominates its wetting characteristics. This was confirmed by three phase contact angle measurements and the electrical charge characteristics of the mineral matter in solvent-refined coal. Either surfactant wetting agents or a pH of 9 to 10 in the water phase can be used to wet the mineral matter of particles and to promote their association with the water phase. Particle transfer studies of asphaltic coated particles in model liquids such as xylene indicate that partial detergency of the asphaltic coatings occurs. This mechanism accounts for the fact that the extent of mineral matter separation decreases with mixing time in the water/oil/particle system. A mathematical model and experimental data on electrical coalescence of water droplets in oil suspension is primarily due to the enhanced electric field and corresponding rupture of the oil film between water droplets at drop separations which are greater than those when coalescence is done in the absence of an electric field. A patent resulted from this work on an improved electrostatical coalescence device which used combined AC and DC electric fields in conjunction with hyrophilic electrodes. Six appendices have been entered individually.

• Research Organization: West Virginia Univ., Morgantown (USA)
• DOE Contract Number: AS05-76OR05105
• OSTI ID: 6702707
• Report Number(s): DOE/OR/05105-T1; ON: DE83002107
• Resource Relation: Other Information: Mf only; illegibility does not permit PC reproduction
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL LIQUIDS
DEASHING
BENCH-SCALE EXPERIMENTS
COAL LIQUEFACTION
COALESCENCE
COATINGS
DROPLETS
ELECTRODES
ELECTROSTATICS
EMULSIONS
EXPERIMENTAL DATA
MATHEMATICAL MODELS
PARTICLES
SOLVENT-REFINED COAL
SURFACTANTS
WETTABILITY
XYLENES
AROMATICS
COLLOIDS
DATA
DISPERSIONS
FLUIDS
FUELS
HYDROCARBONS
INFORMATION
LIQUEFACTION
LIQUIDS
NUMERICAL DATA
ORGANIC COMPOUNDS
THERMOCHEMICAL PROCESSES
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