Aggregates Structure Analysis of Petroleum Asphaltenes with Small-Angle Neutron Scattering

Autor:	Toshimasa Takanohashi, Pappannan Thiyagarajan, Jerry E. Hunt, Ryuzo Tanaka, Shinya Sato, Randall E. Winans
Rok vydání:	2002
Předmět:	Chemistry Scattering General Chemical Engineering Neutron diffraction Analytical chemistry Energy Engineering and Power Technology Neutron scattering Small-angle neutron scattering chemistry.chemical_compound Crystallography Fuel Technology Decalin Deuterium Small-angle scattering Asphaltene
Zdroj:	Energy & Fuels. 17:127-134
ISSN:	1520-5029 0887-0624
DOI:	10.1021/ef020019i
Popis:	The objective of this study is to examine changes in the structures of petroleum asphaltene aggregates in situ with small-angle neutron scattering (SANS). Asphaltenes were isolated from three different crude oils: Maya, Khafji, and Iranian Light. An aliquot of the 5 wt % asphaltene solution in deuterated Decalin, 1-methylnaphthalene, or quinoline was loaded in a special stainless steel cell for SANS measurements. SANS data measured at various temperatures from 25 to 350 {sup o}C showed various topological features different with asphaltene or solvent species. A fractal network was formed only with asphaltene of Maya in Decalin, and it remained even at 350 {sup o}C. In all of the solvents, asphaltenes aggregate in the form of a prolate ellipsoid with a high aspect ratio at 25 {sup o}C and got smaller with increasing temperature. That became a compact sphere with the size of around 25 {angstrom} in radius at 350 {sup o}C.
Databáze:	OpenAIRE
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