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首页> 外文会议>International congress on membranes and membrane processes >Pervaporation of azeotropic mixtures ethanol/ethyl tert-butyl ether: influence of membrane conditioning and operation variables on pervaporation flux
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Pervaporation of azeotropic mixtures ethanol/ethyl tert-butyl ether: influence of membrane conditioning and operation variables on pervaporation flux

机译：共沸混合物乙醇/乙基叔丁基醚的渗透蒸发：膜调理和操作变量对渗透蒸发通量的影响

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This work reports the pervaporative separation of ethanol from ethanol―ethyl ter butyl ether mixtures using a commercial membrane, PERVAP 2256, that previously showed an interesting behavior in the separation of methanol-MTBE mixtures. Pervaporation flux has been obtained and analyzed as a function of feed composition in the range of ethanol concentration of 30―50 wt % and temperature in the range of 50―70°C whereas permeate pressure was kept constant in all the experiments and equal to 3 mmHg. Pervaporation fluxes showed an exponential dependence with both variables, that in the case of temperature fitted to an Arrhenius type expression. Achievement of steady state conditions referred to the pervaporation flux needed of long times that depended on the previous history of the membrane; thus new membranes needed a long conditioning period before reaching steady state that was considerably shortened in subsequent changes of the operation conditions.
机译：该工作报告了使用商业膜，PERVAP 2256的乙醇 - 乙基三丁基醚混合物的抗蒸馏分离，其先前在甲醇-MTBE混合物的分离中表明了有趣的行为。已经获得并分析了渗透蒸发通量并作为乙醇浓度范围内的饲料组合物的函数，温度在50-70℃的范围内，而渗透压力在所有实验中保持恒定，等于3 mmhg。渗透蒸发助熔剂显示出对两个变量的指数依赖性，在温度适配到Arrhenius型表达的情况下。实现稳态条件的成就，需要长时间的渗透流助焊剂，依赖于膜之前的历史;因此，在达到在随后的操作条件的改变之后，达到稳定状态之前需要长调节时段的长调节期。

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