摘要
研究了以不同Mg、Al摩尔比的水滑石为催化剂 ,催化碳酸二甲酯 (DMC)和苯酚的酯交换反应。当Mg与Al摩尔比为 2∶1时 ,水滑石催化DMC与苯酚酯交换反应的活性最高。Mg/Al水滑石催化DMC与苯酚酯交换反应的活性比TiO2 /SiO2 、MoO3 /SiO2 和CaO等固体催化剂高。以摩尔比为 2∶1的Mg/Al水滑石为催化剂 ,在苯酚与DMC摩尔比为 2∶1、催化剂用量为反应物总质量分数的 1 5 %、15 0～ 185℃及时间 12h的反应条件下 ,得到酯交换反应产物碳酸二苯酯和甲基苯基碳酸酯的产率分别为 2 5 8%和 11 2 % ,酯交换反应选择性74 3% ;甲基化反应产物苯甲醚的产率为 12 8% ,选择性为 2 5 7%。水滑石催化剂可重复使用 ,其平均回收率为 78% ,重复使用 5次后 ,对酯交换反应的催化活性基本不变。
The transesterification of dimethyl carbonate(DMC) with phenol was carried out in the presence of Mg-Al-hydrotalcites with different Mg to Al molar ratio. The Mg-Al hydrotalcite with Mg to Al molar ratio 2∶1 showed the highest catalytic activity, and it was more efficient than solid catalysts TiO 2/SiO 2, MoO 3/SiO 2 and CaO. When the reaction was run at 150～185 ℃ for 12 h at n(PhOH)∶n(DMC)=2∶1 and catalyst concentration(mass fraction) 1.5%, the yield of diphenyl carbonate(DPC), methyl phenyl carbonate(MPC) and anisole were 25.8%, 11.2% and 12.8%, respectively, and total selectivity for DPC and MPC reached 74.3%. In addition, 78% of hydrotalcite could be regenerated after 5 times usage of transesterification without significant loss of its catalytic activity.
出处
《应用化学》
CAS
CSCD
北大核心
2004年第7期702-707,共6页
Chinese Journal of Applied Chemistry
基金
.NULL.
关键词
水滑石
催化
酯交换反应
碳酸二甲酯
苯酚
hydrotalcite,catalytic transesterification,dimethyl carbonate,phenol
