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The influence of precipitated asphaltenes on sedimentation of particles in coal liquids
Author(s) -
Verhoff F. H.,
Lui S. S.,
Henry J. D.
Publication year - 1978
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450560411
Subject(s) - sedimentation , agglomerate , economies of agglomeration , precipitation , coal , particle (ecology) , mineralogy , asphaltene , chemical engineering , chemistry , particle size , materials science , geology , sediment , meteorology , organic chemistry , geomorphology , physics , oceanography , engineering
Antisolvent addition to coal liquids causes the precipitation of asphaltenes on mineral particles and increases their sedimentation rate. This paper develops a mathematical model of the sedimentation rate of a single particle or agglomerate of particles. It was found that if the difference in density between the solid and the precipitate is more than twice the difference in density between the precipite and the liquid, the sedimentation rate would decrease initially upon precipitation. A simple experiment was performed to confirm the prediction. Further it was found that the agglomeration of particles had a stronger effect upon the sedimentation than the changes in particle size.