玉米油微乳液的制备及其燃烧性能研究

Preparation and burning performance of corn oil microemulsion

选择甲醇作为亲水相,油酸作为乳化剂,制备了玉米油微乳液.当玉米油质量分数为0.3以下时,形成的微乳液为水包油型(O/W);0.3以上时形成的乳液为油包水型(W/O).玉米油-甲醇微乳液最高储存温度是65℃.4℃冷藏后,当玉米油质量分数为70%以上或甲醇质量分数为90%以上时,依然为透明的微乳液;冷藏出现分层的样品在恢复室温后仍为透明的微乳液.酒精灯模拟燃烧试验证实,尽管微乳液中甲醇含量不断减少,玉米油的含量不断增多,但燃烧火焰没有明显的差别.从黑烟情况看,m(玉米油)∶m(甲醇)大于6∶4的微乳液燃烧时有少量黑烟出现.微乳液燃烧时均可以听到扑扑的爆破声,而且随着甲醇含量增多,爆破声逐级增强,这说明微乳液在燃烧时会发生微爆现象.甲醇燃烧比较平稳,没有爆破声.与甲醇燃烧相比,微乳液火焰明亮偏黄.

The corn oil microemulsion was prepared using methanol as the hydrophiphlic phase, and oleic acid as the emulsifier. The microemulsion was oil in water type when the corn oil mass fraction was less than 0.3, and water in oil type when corn oil mass fraction was higher than 0.3. The highest storage temperature of corn oil-methanol microemulsion was 65 ℃. After cooling at 4 ℃, the microemulsions with more than 70% corn oil or 90% of methanol was still clear, and the layered sample could return clear after returned to room temperature. The alcohol lamp simulating burning test showed no remarkable difference in flame during burn ing of microemulsion with the increase of corn oil dosage and decrease of methanol amount. Small amount of black smoke appeared when the microemulsion with re（corn oil） re（methanol）〉6：4 burned. Micro-explosion sound was heard during burning of all microemulsions whereas such sound became stronger with the metha nol dosage increasing, which indicated that the microemulsion occurred micro-explosion phenomenon during burning. The burning of methanol was smooth and had no explosion sound. Compared with burning of metha nol, the flame of microemulsion was bright and yellow.