Hydrogen bonding in asphaltenes and coal liquids. Quarterly report, 1 February-30 April 1981

Technical Report · Thu Jan 01 04:00:00 EST 1981

DOI:https://doi.org/10.2172/6543946· OSTI ID:6543946

Li, N. C.; Jones, L.; Yaggi, N. F.

The objective of this project is to investigate the nature and strength of hydrogen bonding and other molecular interactions in coal liquids and their fractions. Determinations are made of the molecular interactions involving the preasphaltene, asphaltent and oil, together with their separated fractions, obtained from coal liquids after hydroprocessing under different processing conditions and accelerated aging. NMR, IR, GC/MS, calorimetric, GPC, ESR, viscosity methods are used to determine structural changes caused by upgrading and aging of coal liquids. The upgraded coal liquids, derived from catalytic hydroprocessing of a 30 to 70 weight percent blend of solid solvent refined coal product (SRC-I) with liquid solvent-refined coal product (SRC-II) were analyzed as a function of contact time and temperature, and the observed variations of structural parameters were correlated with the physical properties of the liquid products. The oxidative degradation of a SRC-II middle distillate, which is an oil, free of asphaltenes and benzene-insolubles, was investigated to determine the molecular types of compounds responsible for the viscosity change and postulate mechanisms. Since the middle distillate is relatively stable to oxidative degradation, copper shavings were added to accelerate the process. Results and discussion are presented in detail.

• Research Organization: Duquesne Univ., Pittsburgh, PA (USA). Dept. of Chemistry
• DOE Contract Number: AC22-80PC30252
• OSTI ID: 6543946
• Report Number(s): DOE/PC/30252-T3
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405 -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
010600* -- Coal
Lignite
& Peat-- Properties & Composition
ASPHALTENES
ASPHALTS
BITUMENS
CATALYTIC EFFECTS
CHEMICAL BONDS
CHEMICAL REACTIONS
CHROMATOGRAPHY
COAL LIQUEFACTION
COAL LIQUIDS
COPPER
ELEMENTS
FLUIDS
HYDROGEN
INFRARED SPECTRA
LIQUEFACTION
LIQUIDS
MAGNETIC RESONANCE
METALS
NONMETALS
NUCLEAR MAGNETIC RESONANCE
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDATION
RESONANCE
SEPARATION PROCESSES
SPECTRA
SRC PROCESS
SRC-II PROCESS
STRUCTURAL CHEMICAL ANALYSIS
TAR
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
VISCOSITY