Web Release Date: March 1,
Environmentally Benign Route for the Synthesis of Polycarbonate Diols (PCDLs)-Calcined MgAl Hydrotalcites as Heterogeneous Catalysts
and
Institute of Coal Chemistry, Chinese Academy of Sciences, P.O. Box 165, Taiyuan 030001, People's Republic of China, and Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
Received for review May 31, 2007
Revised manuscript received January 4, 2008
Accepted January 26, 2008
Abstract:
Polycarbonate diols (PCDLs) are known as important intermediates for the manufacture of novel polyurethanes. In this work, PCDLs were prepared via the reaction of hexane-1,6-diol (HD) and dimethyl carbonate (DMC) using calcined MgAl hydrotalcites (HTc) as solid base. The effects of preparative parameters of the catalysts and reaction conditions on the transesterification reaction were investigated. X-ray diffraction (XRD), thermogravimetric analysis-differential scanning calorimetry (TG-DSC), CO2 temperature-programmed desorption (CO2-TPD), and Brunauer-Emmett-Teller (BET) techniques were used to characterize the HTc. The experimental results showed that the pore structure of the catalysts played a crucial role for the synthesis of PCDLs with high efficiency.
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