Synthesis of Polycarbonate Precursors over Titanosilicate Molecular Sieves
Synthesis of Polycarbonate Precursors over Titanosilicate Molecular Sieves
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DOI：
10.1023/b:catl.0000006329.37210.fd
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发表时间：
2003-11
影响因子：
2.8
通讯作者：
R. Srivastava;D. Srinivas;P. Ratnasamy
中科院分区：
文献类型：
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作者：
R. Srivastava;D. Srinivas;P. Ratnasamy
报道了钛硅分子筛（TS-1和TiMCM-41）在合成聚碳酸酯前体如环状碳酸酯、碳酸二甲酯和碳酸二苯酯中的新型催化应用，避免了有毒化学品如光气或CO。以TS-1和TiMCM-41为催化剂，通过CO2与环氧氯丙烷、环氧丙烷和环氧苯乙烯等环氧化物在低温和低压下的环加成反应，高产率地合成了环状碳酸酯。此外，环状碳酸酯与甲醇和苯酚的酯交换反应，在TiMCM-41上，产生其他聚碳酸酯前体，如碳酸二甲酯（DMC）和碳酸二苯酯（DPC）。环状碳酸酯也可以在相同的反应器中由烯烃通过在TiMCM-41存在下使烯烃与环氧化剂（如H2 O2或叔丁基过氧化氢）和CO2的混合物反应来合成。
A novel catalytic application of titanosilicate molecular sieves (TS-1 and TiMCM-41), in the synthesis of polycarbonate precursors like cyclic carbonates and dimethyl and diphenyl carbonates, avoiding toxic chemicals like phosgene or CO, is reported. Cyclic carbonates were prepared, over TS-1 and TiMCM-41, in high yields, by cycloaddition of CO2to epoxides, like epichlorohydrin, propylene oxide and styrene oxide, at low temperatures and pressures. Further, transesterification of the cyclic carbonates with methanol and phenol, over TiMCM-41, yielded other polycarbonate precursors like dimethyl carbonate (DMC) and diphenyl carbonate (DPC). The cyclic carbonates could also be synthesized from the olefins in the same reactor by reacting the olefins, in the presence of TiMCM-41, with a mixture of an epoxidizing agent (like H2O2or tert-butyl hydroperoxide) and CO2.