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The Study of Soybean Oil Epoxidated by Heterogeneous Catalyst

Author: ZuoLiWei
Tutor: ZhangYanWu；JiangJunQing
School: Zhengzhou University
Course: Chemical processes
Keywords: Peroxy phosphotungstic acid Halloysite nanotubes Heterogeneous catalyst Soybean oil epoxidation
CLC: TS221
Type: Master's thesis
Year: 2011
Downloads: 71
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Abstract


The epoxidation of the double bond is to facilitate the application of one of the chemical modification method by the vegetable oil in the industrial field . Currently , epoxy vegetable oil and its derivatives, such as fatty acid methyl ester of vegetable oils , mainly used in the plasticization and the stability of the PVC -based plastic , lubricating oil additives , and the thermosetting resin . In order to develop green epoxidation process , hydrogen peroxide as the oxidant , epoxidation process become a research hotspot . With the hydrogen peroxide epoxidation process , the development and utilization of new types of catalysts . Wherein the peroxygen phosphotungstic acid for the epoxidation of the double bond with the synthesis is simple, low cost , higher catalytic efficiency . Has developed a mostly homogeneous peroxygen phosphotungstic acid catalyst, has good catalytic effect , but , after the end of the reaction , is not easy to recycle . Epoxidized vegetable heterophasic system , the key is to reduce the mass transfer resistance and the recycling of the catalyst . Thus become the inevitable choice the phosphotungstic peroxide heterogeneous acid load . Halloysite nanotube is a layered silicate clay material has a typical hollow, open at both ends of the tubular structure , wherein the tube is about 0.5 2 μm , an inner diameter of approximately 20nm -30nm , wall about 15nm-20nm thick . The halloysite nanotubes having a the typical openings at both ends of the hollow tubular structure , making it a potentially good catalyst carrier . The paper selected halloysite nanotube vector through the introduction of a quaternary ammonium functional groups on its surface using a heterogeneous ion exchange peroxygen phosphotungstic acid load . First on the halloysite nanotube vector - silylation and quaternary ammonium treatment , quantitative introduction of organic quaternary ammonium functional group , immobilized to provide a platform for the peroxygen phosphotungstic acid , the active center of ion exchange ; then load peroxygen phosphorus tungstic acid . soybean oil epoxidized. The specific effects of the applied ligand , mixing method , hydrogen peroxide added to the double bond conversion and epoxidation yield , and catalyst reuse and regeneration performance . The results showed that the : phosphotungstic peroxide acid molecular state to distribute the load on the surface of halloysite ; mechanical agitation and ultrasound with favor the mass transfer between the reactants ; batch feeding plus ligand and hydrogen peroxide are conducive to soybean oil epoxy reaction; load after the non - homogeneous catalysts can be used repeatedly three times , and the catalytic activity can be restored by simple activation .

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CLC: > Industrial Technology > Light industry,handicrafts > Food Industry > Edible oils and fats processing industry > Basic theory
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