Transesterification of glyceryl tributyrate with methanol using strontium borate as the solid base c

• 作 者: HUANG HongSheng LIU ZhiHong
• 机 构: Key Laboratory for Macromolecular Science of Shaanxi Province, School of Chemistry and Chemical Engi
• 出 处: Science China(Chemistry)
• 发表日期: 2013年12期
• 关键词: borate methanol spent molar alkaline reused catalyzed fresh salts catalysis

Four kinds of strontium borates were prepared and characterized by XRD,SEM,EDS,TG-DTA and Hammett titration method,and their catalytic activities were examined in the transesterification of glyceryl tributyrate with methanol for the first time.The separate effects of the molar ratio of methanol to oil,the reaction time,and reusability were investigated.In addition,the catalytic activities of Sr(OH)2and SrCO3were also examined for the comparison.The results showed that the basicity and catalytic activity of these catalysts were decreased as the following order:Sr(OH)2>SrB2O4·4H2O>SrB6O10·5H2O>SrB2O4>SrB6O10>SrCO3,and the reusability decreases as the following order:anhydrous strontium borates(SrB2O4,SrB6O10)>hydrated strontium borates(SrB2O4·4H2O,SrB6O10·5H2O)>Sr(OH)2.The results indicate that the SrB2O4·4H2O with regular morphology,which was obtained at low temperature by a simple preparation method,might be as one kind of good potential alkaline earth salts catalyst for transesterification.Moreover,the possible reaction mechanism is proposed and analyzed.

Four kinds of strontium borates were prepared and characterized by XRD, SEM, EDS, TG-DTA and Hammett titration method, and their catalytic activities were examined in the transesterification of glyceryl tributyrate with methanol for the first time. The separate effects of the molar ratio of methanol to oil, the reaction time, and reusability were investigated. In addition, the catalytic activities of Sr (OH) 2 and SrCO3were also examined for the comparison.The results showed that the basicity and catalytic activity of thesetiles were decreased as the following SrB2O4 · 4H2O> SrB2O4 · 5H2O> SrB2O4> SrB6O10> SrCO3, and the reusability decreases as the following order: anhydrous strontium borates (SrB2O4, SrB6O10)> hydrated strontium borates (SrB2O4 · 4H2O, SrB6O10 · 5H2O)> Sr (OH) 2. The results indicate that the SrB2O4 · 4H2O with regular morphology, which was obtained at low temperature by a simple preparation method, might as as one kind of good potential alkaline earth salts catalyst for transeste rification.Moreover, the possible reaction mechanism is proposed and analyzed.