共查询到18条相似文献,搜索用时 78 毫秒
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电去离子(EDI)高纯水新技术及其研究进展 总被引:8,自引:0,他引:8
介绍了EDI过程的脱盐机理,分析并提出了过程的主要强化途径。阐述了EDI的V-I、pH-I特征及“树脂电再生”等特征及其与电渗析(ED)过程的区别。介绍了国内外EDI的研究进展与应用概况。 相似文献
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将BM引入到CEDI中,构建了BMEDI装置,研究其对弱电解质硅去除的改进效果,并将其与CEDI进行对比考察。结果表明,以一级RO水为进水,在膜堆电流低于0.08A时,BMEDI在产水水质上稍优于CEDI且其膜堆电阻较CEDI更低。进一步以人工添加进水Si含量的方式对BMEDI与CEDI进行考察,在进水Si的质量浓度分别为0.5、1.0、1.5、2.0 mg/L条件下,BMEDI的产水水质和除Si效果均优于CEDI;在上述的进水条件下继续运行25 h,当进水Si的质量浓度为1.5 mg/L时BMEDI的Si去除率和产水电阻率分别达到94.65%和15.0 MΩ·cm,而CEDI则已下降至61.25%和10MΩ·cm。研究表明BMEDI能够适应较高的原水Si含量而稳定制取高纯水,对工业及实验室超纯水的制备具有应用前景。 相似文献
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以超滤-电去离子(UF-EDI)集成膜过程对城市自来水的初级除盐制备纯水进行了研究。通过对过程特征曲线的研究表明,UF-EDI的过程工况介于传统ED过程,以及低原水含盐量条件下用以深度除盐的EDI过程之间。原水电导率为580~700μS/cm,pH6.0时,膜对电压为2.5~3.0V,产品水电导率可达2.4~8.8μS/cm,脱盐率为99%,过程稳定。与反渗透(R0)技术相比,UF-EDI工艺在过程能耗、水利用率、投资费用方面具有优势,有望发展成为低成本低能耗的高效初级纯水制备技术。 相似文献
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膜分离技术制备高纯单宁酸的研究 总被引:6,自引:0,他引:6
工业单宁酸经改性活性炭预处理后,用超滤和纳滤技术纯化的方法制备高纯度单宁酸。重点考察了料液质量分数、操作压力差、料液温度对膜分离效果的影响。确定的最佳工艺条件是:料液质量分数 15%、截留相对分子质量为 6000 的超滤膜和截留相对分子质量为600的纳滤膜的操作压力差分别为 0.10 MPa 和 0.08 MPa、料液温度 40℃。同时探讨了颗粒活性炭通过硝酸氧化改性增强其吸附性能的方法。分析结果表明,膜分离技术有效地实现了不同分子质量的物料分级和截留,精品单宁酸的含量为 97.3%,收率为 84.7%。 相似文献
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《分离科学与技术》2012,47(2):224-233
Newly reported integrated processes are discussed for aliphatic (paraffin) hydrocarbon dehydrogenation into olefins and subsequent polymerization into polyolefins (e.g., propane to propylene to polypropylene, ethane to ethylene to polyethylene). Catalytic dehydrogenation membrane reactors (permreactors) made by inorganic or metal membranes are employed in conjunction with fluid bed polymerization reactors using coordination catalysts. The catalytic propane dehydrogenation is considered as a sample reaction in order to design an integrated process of enhanced propylene polymerization. Related kinetic experimental data of the propane dehydrogenation in a fixed bed type catalytic reactor is reviewed which indicates the molecular range of the produced C1-C3 hydrocarbons. Experimental membrane reactor conversion and yield data are also reviewed. Experimental data were obtained with catalytic membrane reactors using the same catalyst as the non-membrane reactor. Developed models are discussed in terms of the operation of the reactors through computational simulation, by varying key reactor and reaction parameters. The data show that it is effective for catalytic permreactors to provide streams of olefins to successive polymerization reactors for the end production of polyolefins (i.e., polypropylene, polyethylene) in homopolymer or copolymer form. Improved technical, economic, and environmental benefits are discussed from the implementation of these processes. 相似文献
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