Functional group analysis in coal and on coal surfaces by NMR spectroscopy
An accurate knowledge of the oxygen-bearing labile hydrogen functional groups (e.g., carboxylic acids, phenols and alcohols) in coal is required for today's increasingly sophisticated coal cleaning and beneficiation processes. Phospholanes (compounds having the general structure -POCH{sub 2}CH{sub 2}O (1)) are being investigated as reagents for the tagging of liable hydrogen functional groups in coal materials with the NMR-active {sup 31}P nucleus. Of twelve such reagents investigated so far, 2 (2-chloro-1,3-dioxaphospholane, ClPOCH{sub 2}CH{sub 2}O) and 8 (2-chloro-1,3-dithiaphospholane, ClPSCH{sub 2}CH{sub 2}S) have been found to be useful in identifying and quantitating, by {sup 31}P NMR spectroscopy, labile hydrogen functional groups in an Illinois No. 6 coal condensate. Reagent 2 has also been used to quantitate moisture in pyridine extracts of Argonne Premium Coal Samples. Preliminary {sup 119}Sn NMR spectroscopic results on model compounds with the new reagent CF{sub 3}C(O)NHSnMe{sub 3} (N-trimethylstannyltrifluoroacetamide, 14) suggest that labile hydrogen functional groups in coal materials may be more precisely identified with 14 than with phospholanes. 14 refs., 2 figs., 2 tabs.
- Research Organization:
- Ames Lab., IA (USA)
- Sponsoring Organization:
- DOE/FE
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6501246
- Report Number(s):
- IS-5026; ON: DE91004100
- Country of Publication:
- United States
- Language:
- English
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Functional group analysis in coal and on coal surfaces by NMR spectroscopy
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMIDES
CARBONACEOUS MATERIALS
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COAL
COAL EXTRACTS
DAYS LIVING RADIOISOTOPES
DERIVATIZATION
DOCUMENT TYPES
ENERGY SOURCES
EVEN-ODD NUCLEI
FOSSIL FUELS
FUELS
HYDROXY COMPOUNDS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LIGHT NUCLEI
MATERIALS
MOISTURE
NMR SPECTRA
NUCLEI
ODD-EVEN NUCLEI
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PHOSPHORUS 31
PHOSPHORUS ISOTOPES
PROGRESS REPORT
RADIOISOTOPES
SPECTRA
STABLE ISOTOPES
SURFACES
TIN 119
TIN ISOTOPES