Determination of asphaltenes in fuels from coal hydrogenation

Journal Article · Sun Jul 01 04:00:00 EDT 1979 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac50044a017· OSTI ID:6245366

Steffgen, F W; Schroeder, K T; Bockrath, B C

A method is described for the quantitative separation of coal-derived fuels into toluene insolubles, asphaltenes (toluene soluble, pentane insoluble), and oils (pentane soluble). The prime objective was to identify the variables in the procedure that affect the values obtained for asphaltene content. Substitution of toluene for benzene does not have a large effect on the values reported for either insolubles or asphaltenes. However, in order to obtain reproducible determinations, the precipitation of asphaltenes must be rigorously controlled. The precipitation is carried out by adding a large excess of pentane to a slurry prepared from the toluene solubles and toluene. A significant difference was found in the values determined for asphaltenes depending upon the amount of toluene used in the slurry. It is recommended that the amount of toluene in the slurry be equal to or greater than 3 mL/g solubles. 4 figures, 2 tables.

• Research Organization: Dept. of Energy, Pittsburgh, PA
• OSTI ID: 6245366
• Journal Information: Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 51:8; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105 -- Separation Procedures
ALKANES
AROMATICS
ASPHALTENES
ASPHALTS
BENZENE
BITUMENS
CARBONACEOUS MATERIALS
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COAL
COAL LIQUIDS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROCARBONS
HYDROGENATION
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PENTANE
QUANTITATIVE CHEMICAL ANALYSIS
SEPARATION PROCESSES
SOLVENT-REFINED COAL
SOLVENTS
TAR
TOLUENE