两步变温晶种法制备丝光沸石膜及其渗透汽化乙酸脱水性能
Preparation of mordenite membrane for pervaporation dehydration of acetic acid by a two-stage varying temperature crystallization hydrothermal method
作者单位E-mail
王佳轩 大连理工大学化工学院, 吸附与无机膜研究所, 精细化工国家重点实验室, 大连 116024  
李良清 黄山学院化学化工学院, 功能膜与能源材料重点实验室, 黄山 245041  
马磊 大连理工大学化工学院, 吸附与无机膜研究所, 精细化工国家重点实验室, 大连 116024  
吕金印 大连理工大学化工学院, 吸附与无机膜研究所, 精细化工国家重点实验室, 大连 116024  
杨建华 大连理工大学化工学院, 吸附与无机膜研究所, 精细化工国家重点实验室, 大连 116024 yjianhua@dlut.edu.cn 
鲁金明 大连理工大学化工学院, 吸附与无机膜研究所, 精细化工国家重点实验室, 大连 116024  
摘要: 在水热晶种法基础上采用两步变温晶化以高水硅比(nH2O/nSiO2)稀溶液配方为合成液,研制用于渗透汽化(PV)乙酸脱水的丝光沸石膜(MOR膜),考察了变温晶化各段时间、水硅比与氟离子对MOR膜的形貌与分离性能的影响规律。结果表明:高温段晶化时间、水硅比与氟离子对MOR膜的形貌、结晶度和膜层厚度产生显著影响,并影响MOR膜渗透气化分离性能;在高温段(150℃)和低温段(120℃)的晶化时间分别为18和6 h,在水硅比为60且含氟离子体系中所制备的MOR膜的性能最佳,其对质量分数50%的乙酸水溶液的渗透通量和分离系数分别为1.45 kg·m-2·h-1和1 008。
关键词: 丝光沸石膜  变温晶化  渗透汽化  乙酸脱水
基金项目: 国家自然科学基金项目(No.21776032)资助。
Abstract: Pervaporation (PV) has been favorably adopted in the industrial dehydration of various organic mixtures. In this work, mordenite membrane (MOR membrane) for PV dehydration of acetic acid was prepared by a two-stage varying temperature crystallization hydrothermal method from dilute synthesis solution with a high molar ratio of water to silica (nH2O/nSiO2). The effects of varying temperature crystallization time, nH2O/nSiO2, and the amount of fluorine ion on the morphology and separation performance of MOR membrane were investigated. The results showed that the above conditions have significant effects on the morphology, crystallinity, membrane thickness, and PV performance of the MOR membranes. The best performance MOR membrane was prepared at first-stage temperature (150 ℃, 18 h) and second-stage temperature (120 ℃, 6 h) with nH2O/nSiO2=60. The permeation flux and separation coefficient of the mass fraction of 50% acetic acid aqueous solution were 1.45 kg·m-2·h-1 and 1 008, respectively.
Keywords: mordenite membrane  varying temperature crystallization  pervaporation  dehydration of acetic acid mixture
投稿时间:2022-06-09 修订日期:2022-11-11
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王佳轩,李良清,马磊,吕金印,杨建华,鲁金明.两步变温晶种法制备丝光沸石膜及其渗透汽化乙酸脱水性能[J].无机化学学报,2023,39(1):91-97.
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