膜对低浓度苯富集技术研究

Study on enrichment of film to low concentration benzene

本文用扫描电镜对CSM膜进行结构表征,照片显示出膜表面均匀平整,膜与支撑层结合紧密,增强了膜的强度和稳定性。利用CSM膜对C6H6/空气体系进行富集。考察了原料气浓度、原料气流量、渗透侧压力和操作温度对富集效果的影响。实验结果表明:随着原料气中苯浓度的增加,富集率先增大后减小;随着原料气流量的增加,富集率明显降低;随着真空度的增大,富集率明显增大;温度对富集率的影响不大。当原料气操作温度为293.2K、苯的浓度为40×10-6、渗透侧压力0.067MPa、流量为150L.h-1时,CSM膜对低浓度苯的富集效率可达25%。

CSM membranes were characterized by SEM.The photo showed smooth surface,tight combination of membrane and supporting layer,which enhanced the strength and stability of membrane.The enrichment of CSM to C6H6/air system was studied.The effect of concentration and flow of feed gas,osmosis lateral pressure and temperature to enrichment were investigated.The results showed that the enrichment rate increased first and decreased after with the concentration of benzene raised.The enrichment rate decreased with flow of feed gas raised.The enrichment rate increased with vacuity raised.The temperature affected little.The enrichment of CSM membrane to low concentration benzene reached 25% when temperature was 293.2K,the concentration of benzene was 40×10-6,osmosis lateral pressure was 0.067MPa,the flow is 150L·h-1.