以EMT为晶种外延生长制备NaY分子筛膜及其渗透蒸发性能研究

发布时间：2018-03-31 13:57

  本文选题：EMT晶种　切入点：二次生长法　出处：《太原理工大学学报》2017年02期

【摘要】：以EMT为晶种,通过二次生长法制备出NaY分子筛膜并进行了表征,考察了二次生长液的碱度和铝含量对膜微结构的影响。将制备的膜材料应用于碳酸二甲酯与甲醇混合体系的分离,考察了原料液的浓度以及渗透蒸发温度对分离效果的影响,确定了膜层的稳定性。结果表明:二次生长液中,当n(SiO_2)/n(Na_2O)=1/1.4,n(SiO_2)/n(Al_2O_3)=10时,所得到的膜层质量最好。该膜对MeOH/DMC混合体系的分离效果受原料液的浓度和渗透汽化温度的影响显著。在50℃时,随着原料液质量分数的增加(20%~80%),膜材料的分离因子由34.1值降低至5.2,渗透通量由114.7增加至135.5g/(m~2·h);随着渗透汽化温度的升高(20~80℃),对于组成为甲醇质量分数50%的混合体系,膜材料的分离因子由29.8降低至2.8,渗透通量由96.3增加至180.8g/(m~2·h).膜材料稳定性良好,在14h内分离因子和渗透通量无明显改变。
[Abstract]:NaY molecular sieve membranes were prepared by secondary growth method with EMT as seed. The effects of alkalinity and aluminum content of secondary growth liquid on the microstructure of the membrane were investigated. The membrane material was used to separate the mixture of dimethyl carbonate and methanol. The effects of the concentration of the raw liquid and the permeation evaporation temperature on the separation effect were investigated. The stability of the membrane layer is determined. The results show that the film quality is the best in the secondary growth liquid when the number of nSiO2 / nnnnnntix 1 / 1. 4 / SiO2 / SiO2 / Al2O3 = 10:00. The effect of the membrane on the separation of MeOH/DMC mixed system is obviously affected by the concentration of the raw material solution and the pervaporation temperature. At 50 鈩，

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