Continuous Production of Biodiesel from Soybean Oil Using Supercritical Methanol in a Vertical Tubular Reactor:I.Phase Holdup and Distribution of Intermediate Product along the Axial Direction

›› 2010, Vol. 18 ›› Issue (4): 626-629.

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Continuous Production of Biodiesel from Soybean Oil Using Supercritical Methanol in a Vertical Tubular Reactor:I.Phase Holdup and Distribution of Intermediate Product along the Axial Direction

ZHOU Cheng, WANG Cunwen, WANG Weiguo, WU Yuanxin, YU Faquan, CHI Ru'an, ZHANG Junfeng

Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan 430073, China

Received:2009-10-20 Revised:2010-06-22 Online:2010-08-28 Published:2010-08-28

Continuous Production of Biodiesel from Soybean Oil Using Supercritical Methanol in a Vertical Tubular Reactor:I.Phase Holdup and Distribution of Intermediate Product along the Axial Direction

周诚, 王存文, 王为国, 吴元欣, 喻发全, 池汝安, 张俊峰

Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan 430073, China

通讯作者: WANG Cunwen, E-mail:wangcw118@hotmail.com
基金资助:
Supported by the National Natural Science Foundation of China(20576105);the Natural Science Foundation of Hubei Province(2008CDA024);the Project of Academic Leaders in Wuhan(200851430490)

Abstract

Abstract: Production of biodiesel with supercritical methanol is a green synthesis process. A study was carried out in a vertical tubular reactor with a length of 3700 mm and a diameter of 20 mm at 275-375℃ ,15 MPa,and molar ratio of methanol to soybean oil of 40:1.The phase holdup,intermediate product,yield and axial distribution of methyl ester (ME) were investigated.Methanol and oil were mixed non-uniformly due to the formation of biodiesel and difference in their densities,even when the reaction system was in the supercritical state.From top to bottom,the phase holdup of methanol increased and that of oil decreased.As temperature increased,the concentrations of monoglyceride and diglyceride decreased gradually and the ME yield increased.When the temperature reached 300℃ ,the critical temperature of the system,the ME yield was 50%.Further increase in temperature led to a sharp in-crease of ME yield.However,at 375℃ after 1200 s of reaction time,the decomposition rate of ME was greater than its formation rate,reducing the ME yield.

Key words: supercritical methanol, biodiesel, vertical tubular reactor, axial distribution, intermediate product

摘要： Production of biodiesel with supercritical methanol is a green synthesis process. A study was carried out in a vertical tubular reactor with a length of 3700 mm and a diameter of 20 mm at 275-375℃ ,15 MPa,and molar ratio of methanol to soybean oil of 40:1.The phase holdup,intermediate product,yield and axial distribution of methyl ester (ME) were investigated.Methanol and oil were mixed non-uniformly due to the formation of biodiesel and difference in their densities,even when the reaction system was in the supercritical state.From top to bottom,the phase holdup of methanol increased and that of oil decreased.As temperature increased,the concentrations of monoglyceride and diglyceride decreased gradually and the ME yield increased.When the temperature reached 300℃ ,the critical temperature of the system,the ME yield was 50%.Further increase in temperature led to a sharp in-crease of ME yield.However,at 375℃ after 1200 s of reaction time,the decomposition rate of ME was greater than its formation rate,reducing the ME yield.

关键词: supercritical methanol, biodiesel, vertical tubular reactor, axial distribution, intermediate product

ZHOU Cheng, WANG Cunwen, WANG Weiguo, WU Yuanxin, YU Faquan, CHI Ru'an, ZHANG Junfeng. Continuous Production of Biodiesel from Soybean Oil Using Supercritical Methanol in a Vertical Tubular Reactor:I.Phase Holdup and Distribution of Intermediate Product along the Axial Direction[J]. , 2010, 18(4): 626-629.

周诚, 王存文, 王为国, 吴元欣, 喻发全, 池汝安, 张俊峰. Continuous Production of Biodiesel from Soybean Oil Using Supercritical Methanol in a Vertical Tubular Reactor:I.Phase Holdup and Distribution of Intermediate Product along the Axial Direction[J]. , 2010, 18(4): 626-629.

References

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Continuous Production of Biodiesel from Soybean Oil Using Supercritical Methanol in a Vertical Tubular Reactor:I.Phase Holdup and Distribution of Intermediate Product along the Axial Direction

Continuous Production of Biodiesel from Soybean Oil Using Supercritical Methanol in a Vertical Tubular Reactor:I.Phase Holdup and Distribution of Intermediate Product along the Axial Direction

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