Ion pair liquid chromatography of coal-derived light oils

Conference · Tue Jan 01 00:00:00 EST 1980 · Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States)

OSTI ID:6735573

Olson, J K; Farnum, B W

This report describes an ion pair liquid chromatography study of the light oil fraction from the liquefaction of lignite with CO and H/sub 2/ at 460/sup 0/C and 27.6 MPa. The light oil is a mixture of relatively low molecular weight, volatile hydrocarbons. The boiling point of 98% of the sample was in the 40 to 200/sup 0/C range and the molecular weight range was 60 to 365 daltons. The nature of each fraction may be described drawing upon information from elemental analysis; infrared spectra; and low voltage mass spectra. It appears that several factors and different mechanisms contribute to the separation of eight oils by ion pair and ion suppression reverse phase liquid chromatography. An increase in column temperature affected the capacity factors reducing elution times, but the viscosity change and disruption of thermal equilibrium adversely affected the resolution. Due to the variety of species found in the light oil, the separation behavior of certain constituents may be affected by ion pair formation or ion suppression. The relationship depends on the concentration of the counter-ion, its solubility in the bonded phase, and the degree of ionization of the solute which bears a direct relationship to the pH of the mobile phase. The separation of heteroatom and phenolic compounds are generally enhanced by specific ion pair and ion suppression techniques; however, aromatic and hydrocarbon compounds show separations similar to traditional reverse phase techniques. In applying these relationships to the separation of light oils, optimization of chromatographic conditions for each class of compounds must be considered. A summary of these parameters and their influence in the separation of light oils is given. Capacity ratios of certain components can be effectively altered by ion pair and ion suppression techniques so as to significantly improve the separation, resolution, and identification of components in the light oil.

• Research Organization: Department of Energy, Grand Forks, ND
• OSTI ID: 6735573
• Report Number(s): CONF-800814-P2
• Journal Information: Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States), Vol. 25:3; Conference: 180. American Chemical Society meeting/2. chemical congress of the North American Continent, Las Vegas, NV, USA, 24 Aug 1980
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COAL LIQUIDS
EXTRACTION CHROMATOGRAPHY
QUANTITATIVE CHEMICAL ANALYSIS
ACETATES
ACETIC ACID
AROMATICS
CARBON
COAL LIQUEFACTION
HYDROCARBONS
HYDROGEN
LIGNITE
NITRATES
NITROGEN
OXYGEN
PHENOLS
PHOSPHATES
SULFONATES
SULFUR
BROWN COAL
CARBONACEOUS MATERIALS
CARBOXYLIC ACID SALTS
CARBOXYLIC ACIDS
CHEMICAL ANALYSIS
CHROMATOGRAPHY
COAL
ELEMENTS
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
HYDROXY COMPOUNDS
LIQUEFACTION
LIQUIDS
MATERIALS
MONOCARBOXYLIC ACIDS
NITROGEN COMPOUNDS
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHORUS COMPOUNDS
SEPARATION PROCESSES
THERMOCHEMICAL PROCESSES
010600* - Coal
Lignite
& Peat- Properties & Composition
010405 - Coal
Lignite
& Peat- Hydrogenation & Liquefaction
400105 - Separation Procedures