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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。
Continuous operation of the tubular reactor, the use of soybean oil as raw materials in pressure 11 ~ 19MPa, temperature 240 ~ 400 ℃ under the conditions of supercritical methanol continuous preparation of biodiesel. The effects of molar ratio of methanol to oil, pressure, temperature, residence time and co-solvent on the conversion of soybean oil under continuous reaction conditions were investigated. The experimental results showed that higher molar ratio of alcohol to oil improved the conversion of oil, but when the molar ratio of alcohol to oil was over 40: 1, the increase of molar ratio of alcohol to oil had little effect on the conversion of oil. In the range of 11-15 MPa , The effect of pressure on the conversion rate is weakened when the pressure is higher than 15MPa; the reaction temperature has an important influence on the conversion of oil, at above 300 ℃, with the increase of temperature, the conversion of oil However, when the temperature is too high, the oil will decompose. The optimal reaction conditions are as follows: the molar ratio of alcohol to oil is 40: 1, the temperature is 350 ℃, the pressure is 15MPa and the residence time is 1000s. Under this condition, Conversion rate up to 89%. The experiment also studied the effect of adding co-solvent tetrahydrofuran on the conversion of oil.