Synthesis of nano-fibers of aluminum hydroxide in novel rotating packed bed reactor
Synthesis of nano-fibers of aluminum hydroxide in novel rotating packed bed reactor
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DOI：
10.1016/s0009-2509(02)00581-x
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发表时间：
2003-02
影响因子：
4.7
通讯作者：
Jianfeng Chen;L. Shao;Fen Guo;Xingzu Wang
中科院分区：
文献类型：
--
作者：
Jianfeng Chen;L. Shao;Fen Guo;Xingzu Wang
采用新型旋转填充床（RPB）反应器，通过碳化反应和热水解反应合成了纳米纤维状氢氧化铝（AH）。在室温下，向旋转床中通入CO2，使铝酸钠（SA）碳酸化，形成AH凝胶，然后在85°C下，对AH凝胶进行最佳时间为30 min的热水解，得到直径为1-10 nm、长度为50-300 nm的纳米纤维状拟薄水铝石（PB）。讨论了超重力水平、气液比、SA溶液浓度等因素对碳酸化过程的影响。实验结果表明，操作条件对PB的性能有显著影响，PB的形态与AH凝胶的单元结构密切相关。用TEM和XRD对所制备的PB进行了表征，并与传统搅拌釜式反应器（STR）合成的PB进行了比较。与STR反应相比，RPB反应时间缩短近一半，具有明显的优越性。
This paper presents a route of synthesizing nano-fibrillar aluminum hydroxide (AH) by carbonation in a novel rotating packed bed (RPB) reactor and thermal hydrolysis. Carbonation of sodium aluminate (SA) is conducted by introducing CO2into RPB at room temperature to form AH gel which is subsequently treated by thermal hydrolysis for an optimum time of 30 min and temperature of 85°C to yield nano-fibrillar pseudoboehmite (PB) of 1–10 nm in diameter and 50–300 nm in length. Factors affecting carbonation process such as high gravity level, Gas/Liquid ratio and SA solution concentration are discussed. Experimental results reveal that operating conditions have significant influences on the properties of PB and the morphology of PB is closely related to the unit structure of AH gel. The as-prepared PB is characterized by TEM and XRD and compared with those synthesized by conventional Stirred Tank Reactor (STR). Reaction time in RPB shortens for approximately a half compared with that in STR. It is proven that this route has obvious advantages over STR.