Thermogravimetric Study of Cracking Products of Natural Bitumens

Abstract

The cracking and extraction products for Kazakhstan’s oil sand bitumen were determined by thermogravimetric analysis (TGA). By means of this technique, changes in the physical and chemical compositions of natural bitumen occurred during thermal treatment were assessed. The bulk composition was determined and the elemental content of resin-asphaltene compounds evaluated. Microspheres isolated from fly ash after the combustion of coals, were used to catalyze the cracking of natural bitumen. According to elemental analysis, natural bitumen is prone to produce coke formation. Catalytic cracking has a positive effect on the properties of the bitumen obtained from Munaily Mola field. The kinetic reaction orders and activation energies for cracking of natural bitumen were determined fitting the experimental data to an Arrhenius equation. The derived activation energies give insight on the nature of the pyrolysis kinetics of resin-asphaltene.

Recuperación de compuestos de hierro y soluciones de cobalto desde relaves mineros

“…Se pesaron aproximadamente 30 g del material y se pusieron en contacto con 150 mL de solución lixiviante de ácido tartárico 0,5 M y peróxido de hidrógeno al 5 M. El tiempo de lixiviación fue de 5 días y se tomaron muestras de la solución resultante cada 24 horas, determinando la concentración de cobalto mediante el método de espectroscopia de absorción atómica. La determinación del orden de reacción, se realizó a través del método gráfico (Imanbayev et al, 2017).…”