The Synthesis Of Oxyethyene Higher Aliphatic Alcohol As A New Agriculture Products Freshing Material

In this thesis, the natural fatty alcohol and ethylene oxide were used to synthesize fatty alcohol ethylene oxide (OHAA), which was a new agriculture products freshing material. The nodus of synthesis reaction is to search a high performance catalyst. The efficient catalyst of synthesis OHAA were found out in this article. The main results are as follows:The best calcination temperature of Mg/Al/Co composite metal oxides is 500℃. Calcination at this temperature the catalyst owned a good porous structure and formed the internal crystal structure. The ratio of Mg:Al at 3:1 Mg/Al/Co composite metal oxide owned the best catalytic performance. Mg/Al/Co composite metal oxides owned the greatest surface area of 235 when Mg:Al at 3:1. The impact of the amount of catalyst, reaction temperature, reaction pressure in Mg/Al/Co composite metal oxide catalyst synthesis OHAA were researched. The optimized conditions of Mg/Al/Co composite metal oxide catalysis OHAA synthesis were:catalyst amount of 2.5%,temperature 158℃,pressure 0.5 Mpa and the reaction speed was 9.08 g/h, the distribution of OHAA was 90%. Mg/Al/Co composite metal oxides is environmental-friendly catalyst, wich is with good re-use nature and non-toxic pollution. By comparison with conventional KOH catalyst, Mg/Al/Co composite metal oxide catalyst synthesis OHAA have a less speed which is due to strong alkaline of KOH, but the performance of product is better than KOH. Analysis the product catalyst by Mg/Al/Co composite metal oxide by IR spectra and the product on line is matched with we designed. Thin-layer chromatography analysis reveals that the product catalyst by Mg/Al/Co composite metal oxide owned the narrow distribution and low content of PEG-product, and the product of unreacted higher fatty alcohol is not exist. According to the conversion rate the cut off point in Mg/Al/Co composite metal oxide catalyst synthesis OHAA is 63%, which is in line with the response phase of the dynamic equation. We can find the rate constant at different temperatures of Mg/Al/Co composite metal oxide catalyst synthesis OHAA by LnP and time curves. According to Arrhenius equation, activation energy of reaction is 67.7 KJ/mol by fitting 1nK and 1/T curve. Five kinds of Fe-Zn double metal complex catalyst were synthisized through XRD analyze, which have different synthetic route and obtained that 1,4-dioxane ligand catalyst for the degree of crystallinity higher than tert-butyl alcohol as a catalyst ligand; K3Fe (CN) 6 and a mixed solution of organic ligands in solution instilled ZnCl2 catalyst for the synthesis of catalyst was with high crystallinity, compared with other paths; the synthesis of ligands from the pre-accession can be better crystallinity of the catalyst before agents. Comparison of five Fe-Zn double metal complex catalytic activity obtained when the synthesis of high molecular weight OHAA, the appropriate order of dropping is the K3Fe (CN) 6 solution and the organic ligand mixture added to ZnCl2 solution; synthesis of low molecular weight OHAA, ZnCl2 solution was added to K3Fe (CN)6 solution, this can shorten the induction period of time.1,4-dioxane as the ligand of Fe-Zn double metal complex catalysts, and OHAA synthesis rate reached 14.3 g/h. Fe-Zn complex double metal complexes of 1,4-dioxane catalyst OHAA for the synthesis,100℃was the most suitable temperature, catalyst OHAA narrow distribution of reaction products have a very high level.