Author/Authors :
Honorato، نويسنده , , Hercيlio D.A. and Silva، نويسنده , , Renzo C. and Piumbini، نويسنده , , Cleiton K. and Zucolotto، نويسنده , , Carlos G. and de Souza، نويسنده , , André A. and Cunha، نويسنده , , Alfredo G. and Emmerich، نويسنده , , Francisco G. and Lacerda Jr.، نويسنده , , Valdemar and de Castro، نويسنده , , Eustلquio V.R. and Bonagamba، نويسنده , , Tito J. and Freitas، نويسنده , , Jair C.C.، نويسنده ,
Abstract :
The chemical and physical properties of a Brazilian heavy oil submitted to plasma treatment were investigated by 1H low- and high-field nuclear magnetic resonance (NMR) combined to the characterization of rheological properties, thermogravimetry and measurement of basic sediments and water (BSW) content. The crude oil was treated in a dielectric barrier discharge plasma reactor, using natural gas, CO2 or H2 as working gas. The results indicated a large drop in the water content of the plasma-treated samples as compared to the crude oil, giving rise to a reduction in the viscosity. No significant chemical change was produced in the oil portion itself, as observed by 1H NMR. The water contents determined by 1H low-field NMR analyses agreed well with those obtained by BSW, indicating the low-field NMR methods as a useful tool for following the effects of plasma treatments on heavy oils, allowing the separation of the effects caused on the water and oil fractions.
Keywords :
NMR , Heavy Oil , Relaxometry , PLASMA
