Effect of gas and liquid flowrates on the size distribution of barium sulfate nanoparticles precipitated in a two phase flow capillary microreactor
Effect of gas and liquid flowrates on the size distribution of barium sulfate nanoparticles precipitated in a two phase flow capillary microreactor
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DOI：
10.1016/j.cej.2011.08.010
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发表时间：
2011-09
影响因子：
15.1
通讯作者：
D. Jeevarathinam;Ankur Gupta;B. Pitchumani;Ratan Mohan
中科院分区：
文献类型：
--
作者：
D. Jeevarathinam;Ankur Gupta;B. Pitchumani;Ratan Mohan
Production of fine particles by precipitation is a relatively simple process but the control of product particle size distribution can be difficult. In recent years microreactors are being seen as effective devices to achieve this aim and in that the two-phase flow microreactor is a promising alternative. In the present work, fine (nano/micro) particles of barium sulfate have been produced by reacting barium chloride and sodium sulfate solutions in a 30cm long and 830μm inner diameter glass capillary microreactor. The T-inlet section has all three limbs 15mm long and 1mm in diameter. Particle sizes produced ranged from about 200nm to 1100nm, with mean sizes between 300nm and 670nm. Results show that an increase in the flowrate of any of the three streams, the two reactant liquid streams and one inert gas stream, led to a decrease in the mean particle size of the precipitated barium sulfate product. Increased mixing and higher Ba2+ion concentrations in the small microreactor (liquid slugs) are believed to shift rates in favour of nucleation as compared to agglomeration, yielding smaller particles in the product. Size variation results show a trend similar to that reported in earlier researches on BaSO4precipitation in single (liquid) phase microreactors but the actual sizes obtained in the present work are bigger. Other geometries and flow conditions may yield smaller particles, hence the need for further investigation of the two-phase flow system.
