Hydrogen bonding in asphaltenes and coal. Progress report, April 1, 1978--June 30, 1978

Technical Report · Thu Jun 01 04:00:00 EDT 1978

DOI:https://doi.org/10.2172/6831580· OSTI ID:6831580

Li, N. C.; Tewari, K. C.

A direct calorimetric method has been used to determine simultaneously the molar enthalpy, ..delta..H/sup 0/, and equilibrium constant, K, for quinoline (QU) interaction with coal-derived asphaltenes (A), acid/neutral (AA) and base (BA) components of A, silylated asphaltenes (A(TMS)) and heavy oil (HO) fractions in solvent C/sub 6/H/sub 6/. Solvent fractionated A and HO fractions were from three centrifuged liquid product (CLP) samples prepared in the 450 kg (/sup 1///sub 2/ ton) per-day Process Development Unit at Pittsburgh Energy Research Center, at different process conditions from the same feed coal, Kentucky hvAb. For a given system, Qu-A (AA or BA), Qu-HO, the almost constant value of K and linear variation of ..delta..H/sup 0/ with the phenolic oxygen content of coal liquid fractions, have been attributed to the dominance of hydrogen-bonding effects, involving phenolic OH, over other types of molecular interactions in solution. In Qu-A(TMS) system, -..delta..H/sup 0/ values increase with decrease in molecular weight of A(TMS), while -..delta..S/sup 0/ values increase with increase in aromaticity of A fraction. The degree of complexation, in absence of OH groups, is much smaller than Qu-A system and largely depends upon some unusual entropy effects.

• Research Organization: Duquesne Univ., Pittsburgh, PA (USA). Dept. of Chemistry
• OSTI ID: 6831580
• Report Number(s): COO-0063-9
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
AROMATICS
ASPHALTENES
ASPHALTS
AZINES
BENZENE
BITUMENS
CALORIMETRY
CARBONACEOUS MATERIALS
CHEMICAL BONDS
CHEMICAL REACTIONS
COAL
COAL LIQUIDS
ENERGY SOURCES
ENTHALPY
EXTRACTION
FOSSIL FUELS
FUELS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
OILS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OTHER ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
PYRIDINES
QUINOLINES
SEPARATION PROCESSES
SOLVENT EXTRACTION
SOLVENT PROPERTIES
TAR
THERMODYNAMIC PROPERTIES