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›› 2007, Vol. 7 ›› Issue (4): 822-826.

• 材料工程专栏 • 上一篇    下一篇

碱性钙基膨润土脱水材料的制备及表征

邱竹,韦藤幼,李琪琳,童张法   

  1. 广西大学化学化工学院
  • 出版日期:2007-08-20 发布日期:2007-08-20

Preparation and Characterization of Alkaline Ca-bentonite Anhydrous Material

QIU Zhu,WEI Teng-you,LI Qi-lin,TONG Zhang-fa   

  1. School of Chemistry and Chemical Engineering, Guangxi University
  • Online:2007-08-20 Published:2007-08-20

摘要: 用活性白土与氢氧化钙制浆后干燥合成了碱性钙基膨润土脱水材料,考察了制备工艺对产品脱水率的影响,并进行了结构表征,在此基础上与木薯淀粉及分子筛脱水材料进行了比较. 研究结果表明,该材料在60℃时的脱水率为12.1%,比分子筛高,与木薯淀粉相当. 结构表征结果显示,碱性钙基膨润土热稳定性好,再生容易,吸附热小,层间距大,吸附水速度快. 用于乙醇脱水的结果表明,碱性钙基膨润土可作为有机蒸汽脱水材料.

关键词: 碱性钙基膨润土, 脱水材料, 制备, 表征

Abstract: A kind of alkaline Ca-bentonite anhydrous material was presented for removal of water from organic vapor. The material was synthesized by activated clay and calcium hydroxide slurry under the drying condition. The effects of preparation conditions for alkaline Ca-bentonite anhydrous material on its dehydration behavior were investigated. The optimized anhydrous materials were characterized by FT-IR, SEM, XRD and DSC techniques. Compared with molecular sieves and cassava starch, the dehydration rate of alkaline Ca-bentonite is 12.1% at the 60℃, which is higher than that of molecular sieves and equivalent to cassava starch. The structure characterization results indicate that alkaline Ca-bentonite is of good thermal stability, easy regeneration and small adsorption heat. Furthermore, the material has a wide interlayer spacing leading to a rapid speed of water adsorption. The comprehensive comparison shows that alkaline Ca-bentonite has a better performance of dehydration than that of molecular sieves and cassava starch. The application result of the anhydrous material in ethanol vapor dehydration shows that it is satisfactory for the dehydration of organic vapor.

Key words: alkaline Ca-bentonite, anhydrous material, preparation, characterization