Technical review/liquid fuels and chemical feedstocks from coal by supercritical gas extraction

Journal Article · Thu Sep 01 04:00:00 EDT 1977 · Ind. Eng. Chem., Prod. Res. Dev.; (United States)

DOI:https://doi.org/10.1021/i360063a004· OSTI ID:6277469

Gangoli, N; Thodos, G

Technical review/liquid fuels and chemical feedstocks from coal by supercritical gas extraction. A review covers the enhancement of volatility of solids and high-boiling liquids by compressed supercritical gases and the use of such gases in a separation technique which combines solvent extraction and distillation; the need for the extractant to have a critical temperature close to the operating temperature as illustrated by the effects of pressure and temperature (280/sup 0/ to 340/sup 0/K) on the solubilities of naphthalene and phenanthrene in ethylene; the chemical composition of coal, including the claim that coal has a polyadamantane rather than an aromatic structure; the critical behavior of mixtures, including pressure-temperature conditions for existence of a single phase; retrograde condensation in complex mixtures; gas-gas equilibria; the thermodynamics of supercritical gas extraction; supercritical gas diffusion through the coal micropores; the advantages of supercritical gas oveeatere integrated closely with MS or GC/MS. These trapped compounds are believed to be products and residuals of the original coalificans towards a more compl features displaying 'wave-like' and 'fork-like' shapes.

• OSTI ID: 6277469
• Journal Information: Ind. Eng. Chem., Prod. Res. Dev.; (United States), Journal Name: Ind. Eng. Chem., Prod. Res. Dev.; (United States) Vol. 16:3; ISSN IEPRA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010407* -- Coal & Coal Products-- Solvent Extraction-- (-1987)
ALKENES
AROMATICS
CHEMICAL COMPOSITION
CHEMICAL FEEDSTOCKS
COAL LIQUEFACTION
COAL LIQUIDS
COAL TAR
CONDENSED AROMATICS
DISTILLATION
ETHYLENE
EXTRACTION
FLUIDS
FUELS
HYDROCARBONS
LIQUEFACTION
LIQUID FUELS
LIQUIDS
MEDIUM TEMPERATURE
NAPHTHALENE
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PHENANTHRENE
SEPARATION PROCESSES
SOLIDS
SOLVENT EXTRACTION
SUPERCRITICAL GAS EXTRACTION
TAR
THERMOCHEMICAL PROCESSES
VOLATILITY