Separation of large coal molecules using high resolution supercritical fluid chromatography. Annual report March 82-February 83

Technical Report · Tue Mar 01 04:00:00 EST 1983

OSTI ID:5878616

Lee, M L

The development of capillary supercritical fluid chromatography for the separation of large coal molecules has made progress in three areas: density programming, column technology, and detection systems. A microcomputer has been interfaced to a high pressure syringe pump for control of the supercritical fluid mobile phase density. An asymptotic density program has been found to be most useful for separating high molecular weight range mixtures. Polysiloxane stationary phases containing phenyl, tolyl, or cyanopropyl side groups have been synthesized and immobilized on the capillary column wall by free-radical crosslinking. These columns are resistant to the solvating properties of the mobile phase. A scanning fluorescence detector based on fiber optics technology has been constructed. This detector demonstrates a sensitivity better than 1 ng (full scan) for most compounds typically present in coal-derived products. Other detectors including UV-absorbance, flame ionization, and nitrogen thermionic have also been successfully coupled to the capillary supercritical fluid chromatograph. In addition, preliminary results look favorable for using mass spectrometry for detection purposes.

• Research Organization: Brigham Young Univ., Provo, UT (USA). Dept. of Chemistry
• OSTI ID: 5878616
• Report Number(s): PB-83-228353
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105 -- Separation Procedures
CARBONACEOUS MATERIALS
CHROMATOGRAPHY
COAL
ENERGY SOURCES
FORECASTING
FOSSIL FUELS
FUELS
MASS SPECTROSCOPY
MATERIALS
MOLECULAR STRUCTURE
SEPARATION PROCESSES
SILOXANES
SPECTROSCOPY
SUPERCRITICAL FLUID CHROMATOGRAPHY