摘要
在连续操作的管式反应器中,以大豆油为原料在压力11～19MPa,温度240～400℃的超临界甲醇条件下进行连续化制备生物柴油的研究。考察了在连续反应条件下醇油摩尔比、压力、温度、停留时间及共溶剂对大豆油转化率的影响。实验结果表明:较高的醇油摩尔比有利于油脂转化率的提高,但当醇油摩尔比超过40:1后提高醇油摩尔比对提高油脂转化率的影响不大;在11～15MPa范围内,压力升高对油脂转化率影响很大,但高于15MPa后压力对转化率的影响减弱;反应温度对油脂转化率有着重要影响,在300℃以上随着温度的升高,油脂转化率有较大幅度的上升,但温度太高油脂会发生分解反应;醇油摩尔比40:1,温度350℃,压力15MPa,停留时间1000s是该实验获得的最佳反应条件,在该条件下油脂转化率可达89%。实验还研究了添加共溶剂四氢呋喃对油脂转化率的影响。
At the pressure from 11 to 19 MPa and the temperature from 240 to 400 ℃, soybean oil was utilized for continuous preparation of biodiesel under supercritical methanol condition in continuous flow tubular reactor. The effect of methanol/oil molar ratio,the temperature, the pressure,the resident time and the co-solvent upon the conversion of soybean oil were studied systematically. It is found that higher methanol/oil molar ratio can bring on higher conversion. Pressure has an obvious effect on the conversion at the range from 1i to 15 MPa, when the pressure exceed 15 MPa it takes little contribution to the conversion. Temperature influences the conversion obviously especially when it exceeds 300 ℃, but the soybean oil will decompose at too high temperature. The highest conversion 89% could be achieved at 350 ℃ and 15 MPa with methanol/oil molar ratio 40：1 and the reaction time 1 000 s. Besides,as a co-solvent, tetrahydrofuran has effect on conversion of soybean oil.
出处
《化工科技》
CAS
2007年第5期28-33,共6页
Science & Technology in Chemical Industry
基金
国家自然科学基金资助项目(20576105)
湖北省教育厅重大项目(2004Z001)
湖北省教育厅优秀中青年创新团队基金资助项目(2003)
关键词
超临界甲醇法
生物柴油
酯交换反应
连续化操作
Supercritical methanol
Biodiesel
Transesterification
Continuous operation
