Fuel and related compositions – Coal treating process or product thereof – Removal of undesirable
Patent
1987-10-07
1988-10-04
Stallard, Wayland
Fuel and related compositions
Coal treating process or product thereof
Removal of undesirable
44 51, C10L 1000
Patent
active
047753870
ABSTRACT:
Finely divided, clean coal or other carbonaceous material is provided by forming a slurry of coarse coal in aqueous alkali solution and heating the slurry under pressure to above the critical conditions of steam. The supercritical fluid penetrates and is trapped in the porosity of the coal as it swells in a thermoplastic condition at elevated temperature. By a sudden, explosive release of pressure the coal is fractured into finely divided particles with release of sulfur-containing gases and minerals. The finely divided coal is recovered from the minerals for use as a clean coal product.
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Narain Nand K.
Ruether John A.
Smith Dennis N.
Glenn Hugh W.
Gottlieb Paul A.
Hightower Judson R.
Stallard Wayland
The United States of America as represented by the United States
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