甲醇柴油微乳液制备及稳定性的实验研究

摘要

The methanol diescl micro-emulsion was prepared by mixing surfactants oleic acid,diethanolamine,span80,OP-4 in the methanol-diesel hybrid system.And by orthogonal experiment method and viscosity index ,the impact of preparation temperature,stirring time,stirring speed,cosurfactant dosage and methanol content on stability of the methanol diesel micro-emulsion were investigated.The experimental results show that when m(oleic acid)/m (diethanolamine)/ m (span80)/m(OP-4) = 10:2:3:2,content of dissolved methanol increases to the maximum ,viscosity index of the sample is minimum ,viscosity change is minimum at the constant temperature 50 ℃,which presents the best stability of methanol diesel micro-emulsion formula,the order of impact factors is as follows: methanol content > preparation temperature> stirring time> cosurfactant dosage> stirring speed.Methanol diesel microemulsions with best stability can be prepared under the experimental conditions of temperature 30 ℃,stirring time 12min,stirring speed 300 r/min,methanol 5.0 % (wt).%复配油酸,二乙醇胺,span80,op-4四种表面活性剂,将其加入到加甲醇柴油混合体系中,制备甲醇柴油微乳液,并采用正交试验方法与粘度指数法,考察了制备温度,搅拌时间,搅拌速度,助表面活性剂用量,甲醇含量5种因素对甲醇柴油微乳液稳定性的影响程度.实验结果表明,当m(油酸)/m(二乙醇胺)/m( span80 )/m(OP-4)=10∶2∶3∶2时,可增溶甲醇量最大,正交试验结果表明:样品粘度指数最小,50℃恒温前后的粘度变化最小,为稳定性最佳的甲醇柴油微乳液配方,显著性检验结果表明影响因素作用程度依次为:甲醇含量＞制备温度＞搅拌时间＞助剂用量＞搅拌速度.在试验温度为30℃,搅拌时间为12 min,搅拌速度为300 r/min时,添加甲醇质量分数为5％的实验条件下制备甲醇柴油微乳液.