Chemical - Engineering

 Two types of synthetic crystalline zeolites have been used as supports for noble-metal catalysts, namely HZSM-5 and H-Mordenite with SiO ratios of 90 and 40 respectively. The cations, Barium and Strontium zeolite forms were prepared by twice repeated ion-exchange with appropriate chloride solution of 3 normality at pH 7.2 and 50oC. The modified zeolites were dried at 110oC and calcined at 450o C by step wise temperature increase. The ion-exchange by strontium was more effective than by Barium cation. While the ability of H-replacement at HMOR was higher than in case of HZSM-5.

 This research deals with experimental study of the rheological behavior of polymer solutions. All polymers studied in this work are water soluble and used in industries as rheology control additives (rheology modifiers), these are: XC-polymer, Carboxymethyl cellulose (two types),Hydroxyethyl cellulose and Polyvinyl alcohol. The rheological properties of these polymer solutions was investigated using a Couette coaxial cylinder rotational viscometer ( Fann model 35A ), by measuring shear stresses versus shear rates (i.e. the flow curve).

Semi-empirical equations for fluid flow through packed bed have been proposed, depending on statistical fitting of experimental data. Two types of fluids have been used (water and air) separately (single phase flow). Several size distributions of sphere packing materials have been used in the packed bed, and each had been studied separately.Different parameters affecting the pressure drop of fluid flow through