چكيده به لاتين
The formation of heat-resistant salts (HSS) is a major problem for aqueous solutions of alkanolamines in the gas processing industry. There are several ways to remove these salts from the amine solution, and this study examines the electrodealysis method. The electrodealysis process is a very mature technology with many new applications that have been used for more than 50 years on an industrial scale to produce drinking water from salt water sources. This process is a membrane separation process that is based on the electric driving force and ion permeability of ion exchange membranes. Today, ion exchange membranes are widely used in various separation processes such as electrodealysis for desalination of salt water and treatment of industrial effluents, including refinery heat-resistant salt separation. In this study, the heterogeneous anion exchange membrane was synthesized using polyvinyl chloride polymer (PVC), anion exchange resin and tetrahydroforan solvent by solution casting method. First, different ratios of resin to polymer were examined and the most appropriate ratio (1:1) was selected. All the characteristics of the synthesized membranes such as transfer number, ion exchange capacity, water content, selectivity between anions and membrane resistance were measured. In order to improve the performance of ion exchange membranes, there are various strategies in which the studies focused on the surface modification of ion exchange membranes. Surface modification by examining parameters such as ion permeability, water level, number of transmission and selectivity, membrane resistance, etc. in order to change the surface runoff and surface roughness, by making a thin film composite on the membrane by three-phase covalent correction. This included plasma leveling to activate membrane membranes, placing carboxylic acid groups on the surface, and then precipitating multilayer polyethylene (PEI) using a glutaraldehyde (GA) binder, and then testing the properties. The membrane was repeated for the modified membrane and the amount of membrane water was reduced from 28% to 20% after surface modification. Also, there are no significant changes in membrane resistance and a slight increase in membrane resistance from cm2.Ω) 9/86 to cm .Ω 10/06 can be attributed to the decrease in ion exchange capacity after correction. After testing the selectivity between oxalate anions and formats, it was determined that due to the dehydration of the membrane surface after surface modification, due to the difference in anhydride hydration energy, the selectivity of anion formats compared to oxalate Increased by 30%.
