Study On Separation Of Propylene/hydrogen Chloride Mixture Gas By Membrane Technology

Gas membrane permeation and membrane absorption have a lot of advantages, such as little investment, low energy use, convenient use and simple operation, in addition, membrane absorption also has some merits including surprisingly high interfacial area, absence of emulsions, no unloading at low flow rates, no flooding at high flow rates. So gas membrane permeation and membrane absorption are used for separation propylene / hydrogen chloride in this paper.In the first, organophilic rubbery poly (dimethylsilicone) (PDMS) membrane is used for gas membrane permeation. In propylene/nitrogen pure gas system, the influence of pressure and temperature is researched on the permeability and separation factor, in propylene/nitrogen mixture gas system, the influence of pressure and cut-off ration is researched on the permeability and separation factor, the result shows that the concentration polarization has obvious adverse effect on the propylene/ nitrogen mixture system, the pressure and cut-off ration increase which lead to the increase of the concentration polarization. In the mixture gas of hydrogen chloride / nitrogen, the influence of pressure, concentration and cut-off ration are also researched on the permeability and separation factor. In the mixture gas of propylene / hydrogen chloride, the influence of pressure and cut-off ration are researched on the permeability and separation factor. The result shows that PDMS is unsuited for separation of propylene / hydrogen chloride.Secondly, membrane absorption has been studied using polypropylene hollow fiber membrane. In the mixture gas of carbon dioxide/nitrogen, several influence factors are researched, including gas flow rate and concentration, absorbent flow rate and concentration, different absorbent, flow mode. In the mixture gas of propylene/hydrogen chloride, gas flow rate and absorbent flow rate are studied. Furthermore desorption of hydrogen chloride from glycol is researched, the influence factors include distillation temperature and time. The result shows that the effect of membrane absorption is very good in propylene/hydrogen chloride separation using glycol as absorbent, propylene can be separated entirely from the mixture gas, and hydrogen chloride can vaporized easily from glycol.