於超重力系統中製備氫氧化鎂及其於二氧化碳／環氧丙烷之環加成反應之應用

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於超重力系統中製備氫氧化鎂及其於二氧化碳／環氧丙烷之環加成反應之應用

Synthesis of Magnesium Hydroxide in Spinning Disk Reactor for Carbon Dioxide／Propylene Oxide Cycloaddition Reaction

劉子雯 , Masters　　Advisor：陳昱劭;林義峯　　

繁體中文

旋轉盤反應器；氫氧化鎂；二氧化碳再利用；環加成反應；環氧丙烷；碳酸丙烯酯； Spinning Disk Reactor ； Magnesium Hydroxide ； CO2 recovery and utilization ； cycloaddition ； propylene oxide ； propylene carbonate

Abstract │ Reference (79) │ Altmetrics

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CO2 is the primary greenhouse gas which causes global warming in recent decade. According to the International Energy Agency’s report, carbon capture and storage is the key method for reduction of the global CO2 emissions. The captured CO2 can not only be stored which knows as carbon sequestration but also be applied for many other economic utilization.
    Cyclic carbonate synthesis from CO2 and epoxide can be used as intermediates in the production of polymer. Catalyst plays an important role in cycloaddition reaction. Current research has found that hydrogen bond donors can activate the epoxides and enhance the reaction. Using the heterogeneous catalysts can decrease the difficulty of separation of the catalyst and product, making the process suitable for industrial operation.
    High-gravity system has been developed for many years. In the field of crystal engineering, high-gravity technique can be used to produce nanoparticles. The characteristics of high–gravity system are small equipment size, short reaction time, high mass–transfer rate and capable for continuous operation. High-gravity system has higher commercial potential than hydrothermal method and sol-gel method, which are time-consuming, expensive and difficult to scale up.
    The purpose of this research is to synthesize magnesium hydroxide in spinning disk reactor and investigate the efficiency of magnesium hydroxide as a catalyst in cycloaddition reaction. Magnesium hydroxide is prepared by mixing MgCl2 solution and Na(OH)2 solution in spinning disk reactor. The molar ratio of MgCl2 to Na(OH)2 is 1:2 and the rotational speed is 2500rpm. The liquid flow of two reactants are 0.28L/min. The effect of MgCl2 concentration on the particle size and catalytic property of Mg(OH)2 is investigated.
    In the cycloaddition reaction of CO2 and propylene oxide, the effect of temperature, pressure and reaction time on the cycloaddition efficiency is investigated. According to the results, Mg(OH)2 particles having a high surface area of 293.1 m2/g, are produced from 0.5M MgCl2 solution. Using the Mg(OH)2 particles in the cycloaddition reaction, a propylene carbonate yield of 91.5% is obtained at P = 10kg/cm2, T = 180℃ and time = 15hr, while no co-catalysts or solvents are required.
    Furthermore, the cycloaddition reaction using MgO, which is produced by calcination of Mg(OH)2 is performed. Accordion to the results, the catalytic efficiency of Mg(OH)2 is better than that of MgO. The reason is that Mg(OH)2 has hydrogen bond donors that can activate the epoxides and make the cycloaddition reaction more easier.

Reference ( 79 ) 〈TOP〉

Aresta, M., A. Dibenedetto, L. Gianfrate, C. Pastore, "Nb(V) compounds as epoxides carboxylation catalysts: the role of the solvent, "Journal of Molecular Catalysis A: Chemical, vol. 204–205, pp. 245–252, 2003
連結：
Baiker A., "Supercritical fluids in heterogeneous catalysis,"Chemical Reviews, vol. 99, pp. 453-474., 1999
連結：
Bhalchandra M. B. , S. Fujita, Y. Ikushima, M. Arai, "Synthesis of dimethyl carbonate and glycols from carbon dioxide, epoxides, and methanol using heterogeneous basic metal oxide catalysts with high activity and selectivity" Applied Catalysis A: General ,vol.219, pp.259–266, 2001
連結：
Chang, M.H., H. S. Liu, C.Y. Tai, "Preparation of copper oxide nanoparticles and its application in nanofluid",Powder Technology,vol.207, pp.378-386.,
連結：
Chen, Y.S., Y. D. Tai, M. H. Chang, H. S. Liu, "Characteristics of micromixing in a rotating packed bed, "Journal of the Chinese Institute of Chemical Engineering,vol.37, pp.63-69.,2006
連結：

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