Laser desorption mass spectrometry and small angle neutron scattering of heavy fossil materials

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The determination of the structural building blocks and the molecular weight range of heavy hydrocarbon materials is of crucial importance in research on their reactivity and for their processing. The chemically and physically heterogenous nature of heavy hydrocarbon materials, such as coals, heavy petroleum fractions, and residues, dictates that their structure and reactivity patterns be complicated. The problem is further complicated by the fact that the molecular structure and molecular weight distribution of these materials is not dependent on a single molecule, but on a complex mixture of molecules which vary among coals and heavy petroleum samples. Laser Desorption mass ... continued below

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5 p.

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Hunt, J.E.; Winans, R.E. & Thiyagarajan, P. September 1, 1997.

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The determination of the structural building blocks and the molecular weight range of heavy hydrocarbon materials is of crucial importance in research on their reactivity and for their processing. The chemically and physically heterogenous nature of heavy hydrocarbon materials, such as coals, heavy petroleum fractions, and residues, dictates that their structure and reactivity patterns be complicated. The problem is further complicated by the fact that the molecular structure and molecular weight distribution of these materials is not dependent on a single molecule, but on a complex mixture of molecules which vary among coals and heavy petroleum samples. Laser Desorption mass spectrometry (LDMS) is emerging as a technique for molecular weight determination having found widespread use in biological polymer research, but is still a relatively new technique in the fossil fuel area. Small angle neutron scattering (SANS) provides information on the size and shape of heavy fossil materials. SANS offers the advantages of high penetration power even in thick cells at high temperatures and high contrast for hydrocarbon systems dispersed in deuterated solvents. LDMS coupled with time of flight has the advantages of high sensitivity and transmission and high mass range. We have used LDMS to examine various heavy fossil-derived materials including: long chain hydrocarbons, asphaltenes from petroleum vacuum resids, and coals. This paper describes the application of laser desorption and small angle neutron scattering techniques to the analysis of components in coals, petroleum resids and unsaturated polymers.

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5 p.

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OSTI as DE97053816

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  • 214. American Chemical Society meeting, Las Vegas, NV (United States), 7-13 Sep 1997

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  • Other: DE97053816
  • Report No.: ANL/CHM/CP--93246
  • Report No.: CONF-970962--
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 570237
  • Archival Resource Key: ark:/67531/metadc691146

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  • September 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Dec. 15, 2015, 11:42 a.m.

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Hunt, J.E.; Winans, R.E. & Thiyagarajan, P. Laser desorption mass spectrometry and small angle neutron scattering of heavy fossil materials, article, September 1, 1997; Illinois. (digital.library.unt.edu/ark:/67531/metadc691146/: accessed August 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.