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

Technical Report · Thu Jun 01 00:00:00 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
• DOE Contract Number: EY-76-S-02-0063
• OSTI ID: 6831580
• Report Number(s): COO-0063-9
• Country of Publication: United States
• Language: English

Related Subjects

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