Novel measurement systems are applied to characterize external surface area, volume, and drag coefficient/ mass (Cd/m) ratios of two sized coal fractions and a sample of carbon spheres. Measurements are made on individual particles with nominal diameters ranging from 75 to 150 t~m. The measurement s
Molecular weight distributions and size fractionations of H-coal liquids
β Scribed by Mohammed Mahfooz Khan
- Publisher
- Elsevier Science
- Year
- 1982
- Tongue
- English
- Weight
- 463 KB
- Volume
- 61
- Category
- Article
- ISSN
- 0016-2361
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π SIMILAR VOLUMES
To ascertain the effect of the incorporation of calcium to the HA, i.r. spectra of the original HA and the calcium humates complexes obtained at pH 5 and 7 were obtained, see Figure I. The spectra differed from each other mainly in the 1700 to 1500 cm-' region. The band at 1725 cm-' (carbonyl from
## Abstract Size exclusion chromatography (SEC) is a common method for the determination of molecular weight distributions (MWD) of polymers. Using appropriate normalization procedures, MWD data may be put in a form suitable for the description by different theoretical distribution functions. In th
Eight coals were reduced by hexamethylphosphoramide (HMPA)-Na-t-BuOH at room temperature and atmospheric pressure. More than 70 wt % of the coal is soluble in pyridine after this reduction. Coals having 48 wt % of carbon content show a maximum solubility in pyridine after reduction. The pyridine-sol