Studies on the carboxymethylation and methylation of bisphenol A with dimethyl carbonate over TiO2/SBA-15 |
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Authors: | Kunmei Su Zhenhuan Li Bowen Cheng Kun liao Dexin Shen Yufei Wang |
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Institution: | 1. College of Materials and Chemical Engineering, and Tianjin Key Lab of Fiber Modification & Functional Fiber, Tianjin Polytechnic University, Tianjin 300160, China;2. College of Chemical Engineering, Dalian University of Technology, Dalian 116012, China |
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Abstract: | Carboxymethylated species were selectively synthesized from dimethyl carbonate (DMC) and bisphenol A (BPA) over TiO2/SBA-15. On the basis of catalyst characterization by means of XRD, FT-IR, HPLC and GC–MS, the relations between catalytic performance and catalyst properties were discussed. Si–O–Ti was active sites for reaction, and the interaction mode between Ti–O–Si and DMC was main factor to determine carboxymethylation and methylation. When DMC was attacked by Ti–O–Si on two oxygen atoms of CH3–O moiety, BPA attacked carbonyl carbon to form carboxymethylated products. If the interaction occurs through the oxygen of CO moiety, BPA attacked methyl carbon to form methylated products. Chemisorbed H2O over TiO2/SBA-15 made DMC to act as methylating agent. After chemisorbed H2O was removed, carboxymethylated species of two-methylcarbonate-ended-BPA (DmC(1)) and one-methylcarbonate-ended-BPA (MmC(1)) were selectively synthesized. |
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