تاثير عمليات تكميل بر خصوصيات ساختاري و تراوايي غشاي الياف توخالي پلي سولفون و بهينه سازي عوامل موثر با استفاده از مدل شبكه عصبي

چكيده انگليسي :

Abstract Hollow fiber membranes are extensively used in blood purification process Extensive scientifically based studies have been conducted to determine the effectiveness of the hollow fibers membranes and determining the influential structural and process variables involved in this purification process These scientific efforts can be broadly classified into two categories namely those involved with condition under which hollow fibers are produced and those related to the effect of post treatment carried out after production of the fibers Hardly any published scientific work that encompasses the combine effect of these two categories on these types of filter media is available Since a large number of experimental samples were required a laboratory scale fiber spinning machine was designed and fabricated In this study Fiber spinning dope containing polysulfone PSf poly vinyl pyrrolidone PVP K90 N Methyl 2 pyrrolidone NMP in mass ratio of 15 5 80 respectively were used for production of PSf hollow fibers via dry jet wet spinning process Hollow fibers were made on a state of art spinning line which was designed and fabricated during course of this research The effect of bore fluid type on performance of PSf hollow fiber membranes treated with miscellaneous post treatment was investigated An innovative hypochlorite treatment was devised and successfully was used In traditional hypochlorite treatment membranes are placed in a given hypochlorite solution bath for defined time periods but in innovative hypochlorite treatment the hypochlorite solution was injected into channel of the fibers at defined pressure over a range of time Experimentally was found that the novel treatment yield to membrane with significantly higher flux in comparison to membranes treated with traditional hypochlorite treatment for a given time period Additionally a novel algorithm capable of defining the cross section of the hollow fibers in morphological term was developed The effect of eight different post treatments including the novel 95 C water and traditional hypochlorite treatments on morphology of the membranes were evaluated via a pioneering image processing technique The relation between structural parameters of the hollow fibers cross section and hydraulic permeability was modeled using artificial neural network analysis This modeled was capable of establishing a relation between the inputs and hydraulic permeability of the sample with an accuracy of 98 3 Sensitiveness analysis confirmed that the most influential factors affecting hydraulic permeability of the membrane is mean pore size Results pointed to the paramount importance of both bore fluid and post treatment on filtration performance of PSf hollow fiber membrane respectively It was concluded that bore fluid is responsible for changes in the structure of fiber cross section and inner surface topology both which control the effectiveness of post treatment processes It was found that the measured hydraulic permeability of the hollow fiber produced using bore fluid containing solvent and post treated with the innovative hypochlorite treatment for 60 min was nearly 3 2 times those of untreated membrane The increase in flux rate was found to be approximately 2 3 times higher for hollow fiber produced using distilled water It was also concluded that the measured hydraulic permeability of the hollow fiber produced using bore fluid containing solvent treated with the traditional hypochlorite treatment for 12 hours was nearly five times those of untreated membrane The increase in flux rate was found to be approximately 2 8 times higher for hollow fiber produced using distilled water It must be emphasized that hydraulic permeability of the experimental samples used in this research was well within the range of hydraulic permeability of the commercial samples Finally it was established that hydraulic permeability of membranes treated using the combine innovative and traditional treatment was 13time

ثقفي، رضا

تاثير عمليات تكميل بر خصوصيات ساختاري و تراوايي غشاي الياف توخالي پلي سولفون و بهينه سازي عوامل موثر با استفاده از مدل شبكه عصبي

خشك-تر ريسي , پلي وينيل پيروليدون , ان-متيل پيروليدون , تكميل هيپوكلريت , تراوايي هيدروليكي