采用萃取反应法合成二甲基乙醇胺。实验过程中,首先通过测定分配系数和反应速率,验证了萃取技术的可行性;又利用正交实验探索出了反应的最佳工艺条件为:温度为60℃,水与萃取剂的质量比为1∶1,反应时间为120 m in,二甲胺与氯乙醇的物质...采用萃取反应法合成二甲基乙醇胺。实验过程中,首先通过测定分配系数和反应速率,验证了萃取技术的可行性;又利用正交实验探索出了反应的最佳工艺条件为:温度为60℃,水与萃取剂的质量比为1∶1,反应时间为120 m in,二甲胺与氯乙醇的物质的量的比为3.5∶1,在此条件下产物收率可达95.71%。展开更多
A process for the production of glycerol carbonate(GC) is proposed with the transesterification of glycerol(GL)and dimethyl carbonate(DMC) with CaO as catalyst by reactive distillation and extractive distillation. The...A process for the production of glycerol carbonate(GC) is proposed with the transesterification of glycerol(GL)and dimethyl carbonate(DMC) with CaO as catalyst by reactive distillation and extractive distillation. The performance of solvents in separating DMC-methanol azeotrope and the effects of operation parameters on the reactive distillation process are investigated experimentally. The results indicate that both the GL conversion and GC yield increase with the DMC/GL molar ratio, reflux ratio, final temperature of tower bottom, and CaO/GL molar ratio and decrease as the recycle number of CaO increases. The calcium concentration in the residual reaction mixture also decreases remarkably as the DMC/GL molar ratio increases. At DMC/GL molar ratio 4.0, reflux ratio 1.0, final temperature of tower bottom 358 K, and CaO/GL molar ratio 0.05, both the GL conversion and GC yield can reach above 99.0%, and the mass concentration of calcium in the product is less than 0.08%.展开更多
基金Supported by the National Natural Science Foundation of China(21106050)Specialized Research Fund for the Doctoral Program of Higher Education(20100142120066)
文摘A process for the production of glycerol carbonate(GC) is proposed with the transesterification of glycerol(GL)and dimethyl carbonate(DMC) with CaO as catalyst by reactive distillation and extractive distillation. The performance of solvents in separating DMC-methanol azeotrope and the effects of operation parameters on the reactive distillation process are investigated experimentally. The results indicate that both the GL conversion and GC yield increase with the DMC/GL molar ratio, reflux ratio, final temperature of tower bottom, and CaO/GL molar ratio and decrease as the recycle number of CaO increases. The calcium concentration in the residual reaction mixture also decreases remarkably as the DMC/GL molar ratio increases. At DMC/GL molar ratio 4.0, reflux ratio 1.0, final temperature of tower bottom 358 K, and CaO/GL molar ratio 0.05, both the GL conversion and GC yield can reach above 99.0%, and the mass concentration of calcium in the product is less than 0.08%.
