Response surface optimization of lithium ion exchange degree of Na-LSX molecular sieves in flowing aqueous solution system
Using Na-LSX molecular sieve as raw material and lithium chloride solution as an exchange agent,the Li-Na ion exchange degree of Na-LSX molecular sieve in a flowing aqueous solution system is studied.Using Li-Na ion exchange rate as an indicator,single factor experiments and response surface optimization experiments are conducted on three factors:reaction temperature,volume space velocity,and concentration of exchange agent.The operating conditions of ion exchange in the flowing aqueous solutions system are optimized,and the significance of each factor on Li-Na ion exchange rate is clarified.The exchange efficiency is improved,and the utilization rate of lithium salt is improved.The research results show that when the concentration of the exchange agent is 1.08 mol/L,the temperature is 100℃,and the volume space velocity is 12 h-1,the exchange degree of the molecular sieve can reach 96.695%.10 g molecular sieve can achieve exchange equilibrium within 120 min,and the utilization rate of lithium salt is 12%.The significance of the influence of various factors on the exchange rate is in the order of reaction temperature,exchange agent concentration and volume space velocity.
Na-LSX molecular sievelithiumionexchange degreeflowing aqueous solution system
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