منابع مشابه
Electron Spin Resonance Studies of Coals and Coal - Derived Asphaltenes
The d iscovery o f e l e c t r o n s p i n resonance ( e s r ) absorp t ion i n n a t u r a l carbons by Uebersfeld (1) and Ingram ( 2 ) prompted a number of i n v e s t i g a t o r s to apply t h e techn ique t o coa l and materials der ived from c o a l . A t least t h r e e e x c e l l e n t review a r t i c l e s descr ib ing t h e e a r l y esr s t u d i e s o f c o a l s have been publish...
متن کاملMolecular Size Determination of Coal-Derived Asphaltene by Fluorescence Correlation Spectroscopy
The molecular properties of asphaltenes have been the subject of uncertainty in the literature; in particular the molecular architecture is still a matter of debate. Some literature reports provide evidence that the contrast of petroleum asphaltenes versus coal-derived asphaltenes is useful for understanding the governing principles of asphaltene identity. Here, we employ fluorescence correlati...
متن کاملABSTRACT GAWRYS, KEITH LOUIS. How Asphaltenes Aggregate: Role of Chemistry and Solvent.
GAWRYS, KEITH LOUIS. How Asphaltenes Aggregate: Role of Chemistry and Solvent. (Under the direction of Peter K. Kilpatrick) Asphaltenes from three crude oils were separated on a preparatory-scale into 20 30 discrete subfractions by sequential precipitation from mixtures of n-heptane and toluene. The earliest fractions precipitated were characterized by lower than average aromaticity and atomic ...
متن کاملModeling Soot Derived from Pulverized Coal
A semiempirical model has been developed for predicting coal-derived soot. The main feature of the model is a transport equation for soot mass fraction. Tar prediction options include either an empirical or a transport equation approach, which directly impacts the source term for soot formation. Also, the number of soot particles per unit mass of gas may be calculated using either a transport e...
متن کاملOrganic Chemistry I Laboratory
For many years the dehydration of 2-methylcyclohexanol to a mixture of alkenes has been carried out in college organic chemistry labs to demonstrate the application of Zaitzev’s rule and the occurrence of the E1 reaction mechanism in alcohol dehydration reactions. In 1994 David Todd, then a chemistry professor at Pomona College, was distilling the product alkenes out of the reaction mixture whe...
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ژورنال
عنوان ژورنال: Journal of the Fuel Society of Japan
سال: 1981
ISSN: 0369-3775,2185-226X
DOI: 10.3775/jie.60.12_960