Quantitative analysis of multicomponent mixtures of petroleum products by a combination of NMR spectroscopy and mass spectrometry

A combination of mass spectrometry and nuclear magnetic resonance spectroscopy was used to monitor the process of manufacture of liquid fuels with a high density and a high specific calorific value from the by-products of pyrolysis of crude oil fractions. This methodology provided information that characterizes the component, fragment, and group composition of samples for all stages of this process and facilitated the development of ideas on the genetic relation of components of heavy oil residues. Copyright © 2005 by MAIK "Nauka/Interperiodlca" (Russia)

Quantitative analysis of multicomponent mixtures of petroleum products by a combination of NMR spectroscopy and mass spectrometry

A combination of mass spectrometry and nuclear magnetic resonance spectroscopy was used to monitor the process of manufacture of liquid fuels with a high density and a high specific calorific value from the by-products of pyrolysis of crude oil fractions. This methodology provided information that characterizes the component, fragment, and group composition of samples for all stages of this process and facilitated the development of ideas on the genetic relation of components of heavy oil residues. Copyright © 2005 by MAIK "Nauka/Interperiodlca" (Russia)

The composition of humic substances isolated from mongolian brown coal

Methods of elemental analysis, gel-filtration, potentiometry, IR and UV spectroscopy and also 13C NMR were used to study the specific structural features of humic substances separated from low-metamorphized low-calorie brown coal and its residue left after the separation of free humic substances and oxidized by a solution of nitric acid. Treatment of brown coal with nitric acid (15%) leads to an increase in the yield of humics, a change in the content of functional groups and also to the degradation and nitration of the macromolecules. © 2006 by Allerton Press, Inc

The composition of humic substances isolated from mongolian brown coal

Methods of elemental analysis, gel-filtration, potentiometry, IR and UV spectroscopy and also 13C NMR were used to study the specific structural features of humic substances separated from low-metamorphized low-calorie brown coal and its residue left after the separation of free humic substances and oxidized by a solution of nitric acid. Treatment of brown coal with nitric acid (15%) leads to an increase in the yield of humics, a change in the content of functional groups and also to the degradation and nitration of the macromolecules. © 2006 by Allerton Press, Inc