The aim of this study was to evaluate the performance a reverse osmosis (RO) membrane in surfactant removal using various model aqueous solutions. separation tests were performed with laboratory scale units dead-end configuration. Cellulose Acetate (CA) and Polyamide (PA) RO membranes used nonionic, anionic, or cationic surfactants at wide range concentrations. Membrane evaluated permeate flux ...

this study has been investigated, the effects of three different polar polyacrylamides (anionic, cationic, and nonionic) on asphaltene deposition in porous media. all experiments were carried out in various dead oil flow rates (0.2, 0.1 and 0.02 cc/min) and different polymer concentrations (500, 2500, 4000 ppm). the results indicated that asphaltene precipitation was affected by the presence of...

The association of many classes of surface-active molecules into micellar aggregates is a well-known phenomenon. Micelles are in dynamic equilibrium, constantly disintegrating and reforming. This relaxation process is characterized by the slow micellar relaxation time constant, tau(2), which is directly related to the micellar stability. Theories of the kinetics of micelle formation and disinte...

of a dissertation by Ewelina Kalwarczyk A modern, twenty-first-century chemistry, not only continues the research conducted in previous centuries, but also brings together various branches of science and technology. The goal of this approach is usually to create new materials characterized by an interesting combination of physicochemical properties. In my studies, I followed this trend and appl...

The successful formulation of particulate dispersions is often hindered by the presence of charged species dissolved in solution. If present at high enough concentrations, these species can reduce the screening length between particles to near zero, allowing rapid coagulation and destabilization. The addition of a mixture of ionic and nonionic surfactants has been shown in a previous publicatio...