Arash Khosravi

Natural gas is one of the most important primary sources of energy. In recent decades, large gas reservoirs have been discovered, and the hope of discovering more gas reservoirs is very bright. On the other hand, natural gas may contain some impurities: carbon dioxide, hydrogen sulfide, water vapor, etc. In this work, the efficiency of Pebax® 1657 polymer in combination with GO-SiO2 nanoparticles was studied in the construction of new thin layer nanocomposite membranes on PEI substrate to separate water vapor from N2 gas as a model of natural gas. The loading of nanoparticles is a combination of two nanoparticles from 0%, 0.5%, 1%, and it is done by layer dip coating method on the porous substrate PEI. With FTIR, SEM, CA, AFM and TGA structural evaluation analyses, the chemical structure, morphology, topology and thermal stability of the manufactured nanocomposites and the interactions of nanoparticles with each other and on the polymer have been evaluated. The fabricated samples show good thermal stability. The contact angle of the underlying membrane decreased from 77 to 19 degrees and created a highly hydrophilic surface. Nitrogen gas permeability (N2) was measured at different pressures of 2-10 barg. The efficiency of the membranes was improved by the addition of SiO2-GO nanoparticles at a pressure of 2-6 barg. By adding 0.5 wt%GO nanoparticles to the sample containing 0.5 wt% SiO2, permeance and water vaper/N2 selectivity increased. The permeance of water vapor and N2 for the membrane MP 0.5-0.5 at 2-6 barg pressure at 70% relative humidity reached from 158. 4 GPU and 0. 23 GPU to 969. 73 GPU and 31. 39 GPU, respectively. The selectivity of water vapor/N2 for the membrane is MP 0.5-0.5 and a pressure of 2-6 barg of 679 and a 70% relative humidity. The for, the permeance selectivity of water vapor/N2 has increased by approximately 4-8 times compared to the pure state. The results of the use of scavenging gas showed that the increase of scavenging gas has a signi