Dispersing of Petroleum Asphaltenes by Acidic Ionic Liquid and Determination by UV-Visible Spectroscopy

Abstract

Nowadays, constructing a mechanism to prevent the aggregation petroleum asphaltenes by the use of new acidic ionic liquids has become of fundamental importance. In this research, 3-(2-carboxybenzoyl) were tested. It should be noted that during the experiment the presence of the acidic ionic liquid moiety enhanced interactions between asphaltenes and acidic ionic liquids and it greatly limited asphaltene aggregation. We considered parameters such as temperature, amount of dispersant, effect of water: toluene ratio, the stirring time and effects of other ionic liquids, and determination of concentration of petroleum asphaltenes after dispersing by acidic ionic liquid under various parameters using UV-Visible spectroscopy.

Applications of iron and nickel immobilized on hydroxyapatite‐core‐shell γ‐Fe2O3 as a nanomagnetic catalyst for the chemoselective oxidation of sulfides to sulfoxides under solvent‐free conditions

“…Recently, we focused on developing hydroxyapatite‐core‐shell γ‐Fe 2 O 3 systems for organic transformations. In the continuation of our study about developing hydroxyapatite‐core‐shell γ‐Fe 2 O 3 systems and other catalysts for organic transformations, here, we decided to use γ‐Fe 2 O 3 @HAp‐Ni 2+ and γ‐Fe 2 O 3 @HAp‐Fe 2+ as a new and reusable heterogeneous magnetic nanocatalyst for the selective oxidation of sulfides to sulfoxides with 33% aqueous H 2 O 2 (0.5 mL) as an oxidant at room temperature (Scheme ).…”

“…Fe 2+ and Ni 2+ immobilized on hydroxyapatite‐core‐shell γ‐Fe 2 O 3 (γ‐Fe 2 O 3 @HAp‐Fe 2 + and γ‐ Fe 2 O 3 @HAp‐Ni 2+ ) were prepared according to the procedures reported in the literature . The mean size and the surface morphology of the γ‐Fe 2 O 3 @HAp‐Fe 2 + and γ‐ Fe 2 O 3 @HAp‐Ni 2+ were characterized by IR, TEM, SEM, VSM, and XRD techniques (see Supporting information).…”

Application of 1‐methyl imidazole‐based ionic liquid‐stabilized silica‐coated Fe3O4 as a novel modified magnetic nanocatalyst for the synthesis of pyrano[2,3‐d]pyrimidines

“…During the course of our recent research program on the development of new conditions for organic transformations, 1‐methyl imidazole‐based ionic liquid‐stabilized silica‐coated Fe 3 O 4 magnetic nanoparticles (MNPs) were synthesized using the surface modification strategy presented in Scheme .…”

One-Pot Synthesis of Xanthene Derivatives Using Silica Supported [2-(Sulfooxy)ethyl]sulfamic Acid as a Novel and Efficient Catalyst Under Solvent-Free Condition

“…In continuation of our study on application of solid acid [26][27][28][29][30][31][32][33][34][35] , we report the synthesis of 14Hdibenzo [a,j]xanthene derivatives in the presence of a catalytic amount of [2-(sulfooxy)ethyl] sulfamic acid (SESA) as a novel, efficient and recycle eco-friendly organo solid acid catalyst in solvent-free condition by a simple, efficient and high-yielding method (Scheme 1). The reaction conditions were optimized on the basis of the catalysts and temperature ( Table 2 and Table 3).…”