Deuterium Tracer Method for Investigating the Chemistry of Coal Liquefaction. Quarterly Technical Progress Report,April--June 1978.

摘要

The objective of this research is to achieve a better understanding of the mechanism of coal hydrogenation. A deuterium tracer method has been developed to achieve this goal. Analysis of the spent solvent from a hydrogen donor solvent experiment gave definite insight into the mechanism occurring during donor solvent coal hydrogenation. It was found that,not only is deuterium donated from the tetralin-d sub 12to the coal,but protium is transferred from the coal to the tetralin-d sub 12 --and preferentially into the alpha -alkyl position. NMR investigations of the products from several experiments (conducted without a donor solvent) have established that preferential deuterium incorporation occurs in all soluble fractions (oil,asphaltene,benzene--methanol soluble) in the alpha -alkyl positions. A comparison was made of the proton and deuteron NMR spectra of the products from the set of experiments which explored the effects of varying degrees of hydrogen contact opportunity. While it had been found that the amounts of soluble products varied among the three experiments,it was found that the structural positions of the protium and deuterium in the products do not appear to vary strongly among the experiments. (ERA citation 04:038076)