Studies On Performance Of Switchable Solvent DBU/Methanol

The characteristic of switchable solvent can be opened or closed by external stimuli. Just like a switch in the solvent, the biggest advantage is that you can switch the specific properties of solvent (physical and chemical properties, or number of phases), so that it can meet the needs of the next step. Due to the shortage of non-renewable resources of coal, and oil, the new energy biodiesel is the best choice to replace the non-renewable energy, algae rich in a large number of biodiesel.Traditional solvents used in conventional chemical processes are mostly volatile organic compounds, and most of them are toxic and harmful, which destroying the ozone layer precursor, the main component of smog. Therefore, not only in the course of causing environmental pollution produced during the reaction and disposal of waste liquid will greatly increase the cost of production. At this time, environment friedly alternatives-green solvents gradually coming into sight. Switch solvents as a green organic solvent has abtained much attention during the extraction of biodiesel.In our paper, based on previous research on switchable solvent, use DBU/Methanol (DBU=1,8-diazabicyclo[5.4.0]undec-7-ene) as switchable solvent, soybean oil instead of algae oil, Under anhydrous conditions determined the optimum conditions of oil extraction and switchable solvent recycling by condition experiments.The paper is made of four parts. The first part is literature review. It mainly introduces the switchable solvent concept, development and application. DBU structural features, synthetic route, application. The second part is the experimental process. The third and the fourth part is about experiment condition. This part will relate to various kinds of influences on the reaction and the optimization condition.The last part is conclusion.In this paper, through a series of experiments ultimately determines the relative better reaction conditions:soybean oil extraction:VDBU/VMethanol:1:1; Vswitchable solvent: 21 ml; Vsoybean oil:7 ml; time of bubbling CO2:35 min; T:room temperature; rotating speed:540r/min. The yield of soybean oil:91.43%. The recycling of switchable solvent:T:130 ℃; reflux condenser t:1.5 h; N2 bubbling; rotating speed:540r/min. Kerosene as substrate:kerosene extraction:VDBU/VMet-hanol:2:1; Vswitchable solvent:15 ml; Vkerosene:5 ml; time of bubbling CO2:5 min; T:room temperature; rotating speed: 540r/min. The yield of soybean oil:96%. The recycling of switchable solvent:T: 130 ℃; reflux condenser t:1.5 h; N2 bubbling; rotating speed:540 r/min. The effect order of different factors for the reduction was gotten by orthogonal experiments L9(33):Vswitchable solvent/Vsoybean oil> temperature of bubbling CO2> VDBU/VMethanol.The recycling of switchable solvent was more than 6 times.