This paper presents the feasibility of the removal of asphaltenes from aqueous solutions by using low- cost natural adsorbents such as light expanded clay aggregate (LECA), perlite and bentonite. The structure of adsorbents was characterized by XRD, FTIR, and SEM before and after the adsorption of asphaltenes. The effect of the adsorbent type, initial asphaltene concentration, particle size of ...

The influences of several operating factors on the viscosity of the Isfahan refinery waxy crude oil sample are studied through conducting some rheological shear rotational tests. The Taguchi design method is adopted to determine the impact of factors such as shear rate, temperature, cooling rate, wax content, and asphaltene content on the viscosity of the waxy crude oil. The results show that t...

Selected carbon-rich refinery residues ('binders') mixed with mineral particles can form composite materials ('bituminous concrete') with bulk mechanical properties comparable to those of cement concrete. The microstructural mechanism underlying the remarkable composite properties has been related to the appearance of a rigid percolating network consisting of asphaltenes and mineral particles [...

Abstract In this paper, the effect of asphalt deposition inhibitors coal tar, bromohexadecylpyridine and sodium oleate on viscosity reduction asphaltene crude oil was investigated. The results show that tar has a better inhibitory asphaltenes in oil. is best when addition amount 0.5%. Compared with blank, content reduced from 24.47% to 9.42%. cationic surfactant have good synergistic effect, by...

Solvent exchange is a controlled process for dilution-induced phase separation. This work utilizes the solvent method to reveal effect of mixing dynamics on asphaltene precipitation under 20 different conditions using model system n-heptane and in toluene. The external between solution paraffinic strictly controlled. We employed high-spatial-resolution total internal reflection fluorescence mic...

Model compounds were used to provide some chemical boundaries for the eight-fraction SAR-ADTM characterization method heavy oils. It was found that Saturates fraction consists of linear and highly cyclic alkanes; Aro-1 molecules with a single aromatic ring; Aro-2 mostly 2 3-ring fused molecules, pericondensed 4-ring molecule pyrene, 3–5 rings are not fused; Aro-3 4-membered catacondensed aromat...