垂直管式反应器中超临界甲醇连续制备生物柴油I:相含率及反应中间产物的轴向分布(英文)

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°C,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°C,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°C after 1200 s of reaction time,the decomposition rate of ME was greater than its formation rate,reducing the ME yield.     

苯甲醛类产品的研究进展

本文围绕苯甲醛分子上所取代的基团不同,将苯甲醛类产品划分成含吸电子基和供电子基两大类,并综述了近几年来该类产品的研究情况,指出了其研究的难度和今后的研究方向。     

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介绍了混合菌在食品、环保、资源和能源等方面的应用情况，总结了混合菌的培养方式，并提出了发展方向。     

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日本Nankai工业公司综框零件简介

1铝条铝条选用铝合金(A_2S_5-T_6)制作,空心,并带有支撑筋.它很轻,受到剧烈振动也不会破坏,综框配置这样的铝条非常理想.     

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本文研究芦根提取,配制生产饮料的方法,讨论用水量、温度和时间对提取效果的影响。