College of Engineering

The principle aim of this project is to show if it is possible to use the activities coefficients at infinite dilution to find the parameters of different models. It was suggested two modern methods for calculating the activities coefficients at infinite dilution (γ∞), MOSCED method (modified separation of cohesive energy density) and SPACE method (Solvatochromic Parameters for Activity Coefficient Estimation).

Complex chemical equilibrium usually occurs at severe conditions in which experimental measurements are very difficult. Therefore, in order to obtain accurate theoretical results, attention had been directed to investigate the existing methods, and to modify the most suitable one to give accurate results. This work included both theoretical analysis and experimental work.In the theoretical analysis, an adequate method for calculating chemical equilibrium in a predominantly gaseous, multi-component reactive mixture was investigated and successfully applied.

The object of this research is to fined additives for oil base stocks which have the ability to raise its viscosity. Three polymers (polyisoprene 1502, 1320, Butile) where selected for that purpose. The three type of