Sulfur removal and comminution of carbonaceous material

Patent · Fri Jan 01 00:00:00 EST 1988

OSTI ID:866729

Narain, Nand K ^[1]; Ruether, John A ^[2]; Smith, Dennis N ^[3]

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1. Bethel Park, PA
2. McMurray, PA
3. Herminie, PA

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.

• Research Organization: USDOE Pittsburgh Energy Technology Center (PETC), PA (United States)
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4775387
• OSTI ID: 866729
• Country of Publication: United States
• Language: English

Related Subjects

sulfur
removal
comminution
carbonaceous
material
finely
divided
clean
coal
provided
forming
slurry
coarse
aqueous
alkali
solution
heating
pressure
critical
conditions
steam
supercritical
fluid
penetrates
trapped
porosity
swells
thermoplastic
condition
elevated
temperature
sudden
explosive
release
fractured
particles
sulfur-containing
gases
minerals
recovered
product
aqueous alkali
coal product
containing gases
supercritical fluid
elevated temperature
carbonaceous material
finely divided
containing gas
sulfur-containing gases
sulfur removal
alkali solution
sulfur-containing gas
clean coal
coarse coal
divided coal
/44/209/