Experimental Study on the Recovery of Hydrogen Bromide from Sodium Bromide Wastewater Dissociated by Bipolar Membrane Electrodialysis
Pure Terephthalic Acid(PTA)is an important petrochemical product,and hydrogen bromide is widely used as a promoter in the high-temperature oxidation method to prepare PTA,but it produces high concentration sodium bromide wastewater.The experiment uses bipolar membrane electrodialysis to dissociate the simulated sodium bromide wastewater,and simultaneously recovering hydrogen bromide,and studies the effects of reaction time,initial salt concentration,and current density on product concentration,and explores the feasibility of applying this technology to high-value treatment and resource recycling of sodium bromide wastewater in the petrochemical industry.The results show that with the passage of reaction time,the acid concentration in the acid chamber and the alkali concentration in the base chamber gradually increase,after 140 min of reaction,the rate of increase in acid concentration and alkali concentration slows down and remains at a certain level;the higher the initial salt concentration,the higher the acid and alkali concentrations,and the sodium hydroxide solution with a concentration of 2 mol/L and the hydrogen bromide solution with a concentration of 2 mol/L can be obtained;the higher the current density,the shorter the reaction time,and the faster the rate of increase in acid and alkali concentrations,but the current efficiency decreases.
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