用甲醛对聚乙烯醇进行改性,并用于质量分数约为100 μg/g微水重石脑油体系的渗透汽化(PV)深度脱水.考察了操作温度T、料液浓度C_w、操作流量q_v,等因素对分离性能的影响.渗透通量J与分离系数α随T、C_w的升高分别增大和减小,且J随g_v的增大而增大.实验证明在操作温度80℃,膜后压力1.5 kPa,流量500 L/h下,实现了J=60.6 g/(m~2·h),α=221.9的最佳分离效果,该技术有效脱除了油品中的微量水分,具有很好的工业应用前景.
The polyvinyl alcohol (PVA) composite membrane was modified with formaldehyde, and it was used for deep dehydration of the micro - water heavy - naphtha system (water mass fraction about 100 μg/g) through the pervaporation (PV). The effects of operation temperature (T), feed concentration (C_w) and operation flow rate (q_v) on the dehydration properties were investigated. The experimental results indicated that the permeation flux (J) increases with the increase of T, C_w, q_v and the separation factor (a) decreases with the increase of the T and C_w. The experiments proved that the membrane had the best separation effect with J =60.6 g/(m~2 · h), a = 221.9 at 80℃, 1.5 kPa pressure of downstream and 500 L/h of flow rate. The pervaporation technique removed the trace water from oil effectively, which has a good industrial application prospect.
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