Identification of nonvolatile coal derived products via chromatography coupled with on-line FTIR DETECTION: Quarterly progress report, March 1, 1987-May 31, 1987

Technical Report · Sun Nov 01 04:00:00 EST 1987

OSTI ID:5732607

Taylor, L T

Nitrogen-containing compounds with basicities ranging from pK/sub a/ = -3 to pK/sub a/ = +7 have been separated via supercritical fluid chromatography employing packed columns. The presence of methanol as a modifier to the supercritical CO/sub 2/ promoted elution and improved peak shapes. While the modifier effect with the PRP-1 column is not explainable, it would appear that for silica based columns (silica, C/sub 18/ and NH/sub 2/) the methanol deactivates silanol sites via hydrogen bonding. The propylamino phase yielded the best results. Partitioning of the analytes with the octadecyl phase seemed to be minimal. Interaction with accessible silanol sites appeared to dominate the separation mechanism in the absence of modifier. In the presence of modifier, partitioning with the propylamino phase is suggested. 21 refs., 7 figs., 5 tabs.

• Research Organization: Virginia Polytechnic Inst. and State Univ., Blacksburg (USA)
• DOE Contract Number: FG22-84PC70799
• OSTI ID: 5732607
• Report Number(s): DOE/PC/70799-T11; ON: DE88002731
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
AFFINITY
ALCOHOLS
AMINES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHROMATOGRAPHY
COAL
COAL LIQUIDS
COLUMN PACKING
COMPARATIVE EVALUATIONS
DOCUMENT TYPES
ENERGY SOURCES
EXTRACTION APPARATUSES
EXTRACTION COLUMNS
FLUIDS
FOSSIL FUELS
FOURIER TRANSFORM SPECTROMETERS
FUELS
HYDROCARBONS
HYDROXY COMPOUNDS
LIQUID COLUMN CHROMATOGRAPHY
LIQUIDS
MATERIALS
MEASURING INSTRUMENTS
METHANOL
MINERALS
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PACKINGS
PH VALUE
PROGRESS REPORT
SEPARATION EQUIPMENT
SEPARATION PROCESSES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SOLUBILITY
SORPTIVE PROPERTIES
SPECTROMETERS
SUPERCRITICAL FLUID CHROMATOGRAPHY
SURFACE PROPERTIES