Conditioning of carbonaceous material prior to physical beneficiation

Patent · 01 January 1987

OSTI ID:866369

Warzinski, Robert P ^[1]; Ruether, John A ^[2]

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1. Venetia, PA
2. McMurray, PA

A carbonaceous material such as coal is conditioned by contact with a supercritical fluid prior to physical beneficiation. The solid feed material is contacted with an organic supercritical fluid such as cyclohexane or methanol at temperatures slightly above the critical temperature and pressures of 1 to 4 times the critical pressure. A minor solute fraction is extracted into critical phase and separated from the solid residuum. The residuum is then processed by physical separation such as by froth flotation or specific gravity separation to recover a substantial fraction thereof with reduced ash content. The solute in supercritical phase can be released by pressure reduction and recombined with the low-ash, carbonaceous material.

• Research Organization: Pittsburgh Energy Technology Center
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4695372
• OSTI ID: 866369
• Country of Publication: United States
• Language: English

Related Subjects

/208/209/
ash
ash content
beneficiation
carbonaceous
carbonaceous material
coal
conditioned
conditioning
contact
contacted
content
critical
critical pressure
critical temperature
cyclohexane
extracted
feed
feed material
flotation
fluid
fluid prior
fraction
froth
froth flotation
gravity
low-ash
material
material prior
methanol
minor
organic
phase
physical
physical beneficiation
physical separation
pressure
pressure reduction
pressures
prior
processed
recombined
recover
reduced
reduced ash
reduction
released
residuum
separated
separation
slightly
solid
solid feed
solute
specific
specific gravity
substantial
substantial fraction
supercritical
supercritical fluid
temperature
temperatures
times