الفهرس 
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Abstract
The influence of high and low thin film layer thickness on membrane performance according to permeate flux and rejection. So, It was necessary to study the factors affecting the formation of the layer to control its thickness to maintain its homogeneity and the stability of the performance of the membrane. The model to create a thin-film composite sheet membranes by diffusion and reaction rate controlled under non-steady-state boundary conditions using interfacial polymerization has been investigated. By simplifying the general model, we can get a model for diffusion or reaction controlled under non-steady-state boundary. According to this research, theories for the production of thin films may be used to modify the thickness of the surface barrier layer in interfacial polymerization. Ultra-filtration polymeric membrane was prepared using 14wt% PES with 4wt% PEG and 1wt%PAN which were dissolved in the solvent 1-Methyl-2- pyrrolidinone (NMP). The mixing time of the polymeric mixture was 8 hrs. To creating a polyamide active layer on top of a substrate using 2wt% PIP and 0.35wt% SDS with various soaking times 10, 15, and 20 minutes. Adding IPC in n-hexane and then the annealing took 5 min. at 80°C. NF thin film composite membranes’ flux and salt rejection were considerably improved. The membrane has a NaCl rejection percentage of 97.8% and a penetration flux of 21.54 L/m2.h. This study separates a 5000ppm salt solution at low working pressure (5 bars). The thickness of the active layer for different soaking time 10,15 and 20 min found to be 0.168 µm, 0.199 µm and 0.295 µm respectively. The experimental data are compared to the theoretical model and showed there is a small deviation equal to 1.7%.