Preparation of NaOH for CO2 capture by electrolysis of Na2SO4
As an important means of carbon capture in flue gas,chemical absorption has been widely used in various demonstration projects.Among them,the sodium alkali method has the advantages of low volatility,low toxicity and low cost compared to the current mainstream absorption method.In this paper,to deal with the acidic gas CO2 in flue gas and the desulfurization wastewater containing Na2SO4 after dry desulfurization and SO2 removal,electrolytic Na2SO4 and CO2 capture by NaOH aqueous solution were coupled to analyze the electrolytic efficiency and NaOH yield under different conditions,explore the absorption effect of CO2 capture in absorption equilibrium experiment and spray tower,and compare the crystallization amount of NaHCO3 under different conditions.The electrolysis efficiency and NaOH yield under various conditions were analyzed.The CO2 absorption equilibrium experiment showed that the electrolytic product NaOH had a higher absorption amount and absorption rate than Na2CO3,and MEA could further enhance the CO2 absorption effect of NaOH.When the temperature was 50℃ and the liquid-gas ratio was 167,the CO2 capture effect in the spray tower was optimal with an absorption rate of 98.67％.Fine crystalline rod-shaped NaHCO3 powder can be obtained and the maximum crystallization amount can reach 22.447g.
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