Molecular weights of lignite macromolecules
The goal of this research is to apply reliable and accurate polymer characterization methods to the high molecular weight macromolecules of the lignite. The authors utilized low-angle laser light scattering (LALLS) photometry in a static mode and also coupled with size exclusion chromatography (SEC) for the determination of weight average molecular weights and molecular weight distributions. Polymers can be separated on the basis of size by SEC, thus providing information about molecular weight distributions; however, molecular weight values depend on calibration data which are subject to large errors. These errors result from the lack of similarity between the shapes and polarities of the calibration standards and the materials whose molecular weights are to be determined. Since light scattering techniques give absolute molecular weight values, a LALLS photometer was used as an on-line detector in an SEC system and no error prone calibrations of the size exclusion column were necessary. A refractive index (RI) detector was used in series with the LALLS flow cell to provide concentrations of the eluting solute.
- Research Organization:
- Univ. of North Dakota, Energy Research Center, Box 8213, Univ. Station, Grand Forks, ND
- OSTI ID:
- 5723077
- Report Number(s):
- CONF-860425-
- Journal Information:
- Am. Chem. Soc., Div. Gas Fuel Chem., Prepr.; (United States), Journal Name: Am. Chem. Soc., Div. Gas Fuel Chem., Prepr.; (United States) Vol. 31:1; ISSN ACGPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010600* -- Coal
Lignite
& Peat-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
BROWN COAL
CALIBRATION
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CHROMATOGRAPHY
COAL
COAL LIQUEFACTION
DECOMPOSITION
DISTRIBUTION
ENERGY SOURCES
ERRORS
FOSSIL FUELS
FUELS
LIGHT SCATTERING
LIGNITE
LIQUEFACTION
MATERIALS
MOLECULAR WEIGHT
ON-LINE MEASUREMENT SYSTEMS
ON-LINE SYSTEMS
OPTICAL PROPERTIES
PHOTOMETRY
PHYSICAL PROPERTIES
POLYMERS
PYROLYSIS
REFRACTIVITY
RESEARCH PROGRAMS
SCATTERING
SEPARATION PROCESSES
STRUCTURAL CHEMICAL ANALYSIS
THERMOCHEMICAL PROCESSES