Identification of nonvolatile coal derived products via chromatography coupled with on-line FTIR detection. Quarterly progress report, March 1-May 31, 1985. [C/sub 2/H/sub 2/ extracts of ground coal, coffee and paprika]
Because it has been our goal to interface the supercritical fluid chromatograph with a Fourier transform infrared spectrometer we have initially chosen packed columns due to their increased sample capacities, and supercritical CO/sub 2/ because of its infrared transparency. This paper compares two sampling techniques that can be utilized in packed column supercritical fluid Chromatography (SFC). Traditional sample introduction is accomplished using an injector with a sample loop. The loop is filled with the appropriate amount of material, and subsequently inserted into the mobile phase path. In most cases the sample must be either dissolved or extracted into an appropriate solvent for such sample introduction. Note that unlike HPLC, where the solvent can be the same as the mobile phase, traditional sampling with SFC must use a solvent that is very different from the mobile phase. As a result, solvent peaks are almost always present, especially with universal detectors like FTIR. An alternative method is described here whereby both extraction of the sample and introduction of the extract onto the column is accomplished on-line using only the supercritical fluid mobile phase. This sampling technique is made possible by a simple valving scheme which ties directly the extraction vessel, the injector, the packed column and the detector. This technique has several advantages over the traditional methods, not the least of which is the absence of a large amount of foreign solvent introduced on the column. 11 refs., 7 figs.
- Research Organization:
- Virginia Polytechnic Inst. and State Univ., Blacksburg (USA)
- DOE Contract Number:
- FG22-84PC70799
- OSTI ID:
- 5177196
- Report Number(s):
- DOE/PC/70799-T4; ON: DE86000868
- Country of Publication:
- United States
- Language:
- English
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Identification of nonvolatile coal derived products via chromatography coupled with on-line FTIR detection. Quarterly progress report, June 1-August 31, 1985. [N-methylaniline, N,N-dimethylaniline]
Identification of nonvolatile coal derived products via chromatography coupled with on-line FTIR detection. Quarterly progress report, December 1, 1984-February 28, 1985
Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COAL EXTRACTS
SAMPLING
SUPERCRITICAL FLUID CHROMATOGRAPHY
CARBON DIOXIDE
COFFEE BEANS
COLUMN PACKING
EXPERIMENTAL DATA
FOURIER TRANSFORMATION
INFRARED SPECTROMETERS
RESEARCH PROGRAMS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHROMATOGRAPHY
DATA
INFORMATION
INTEGRAL TRANSFORMATIONS
MEASURING INSTRUMENTS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PACKINGS
SEEDS
SEPARATION PROCESSES
SPECTROMETERS
TRANSFORMATIONS
010600* - Coal
Lignite
& Peat- Properties & Composition
400102 - Chemical & Spectral Procedures