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| Preparation and characterization of phase transfer catalyst gemini phosphotungstic acid quaternary ammonium salt and its catalytic cracking of oleic acid to prepare azelaic acid |
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| DOI： |
| KeyWord:phosphotungstic acid quaternary ammonium salt gemini surfactant quaternary ammonium salt oleic acid azelaic acid |
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| Abstract: |
| A gemini surfactant was synthesized with bromooctadecane and tetramethylethylenediamine, and the gemini phosphotungstic acid quaternary ammonium salt \[C42H90N2\]HPW12O40 was prepared by co-precipitation with phosphotungstic acid. The catalyst was characterized by 1H NMR, 13C NMR, FT-IR, XRD and XPS, and it was used for oxidative cracking of oleic acid to prepare azelaic acid. The results showed that gemini phosphotungstic acid quaternary ammonium salt not only retained the advantages of high efficiency mass transfer of homogeneous catalyst, but also had the advantage of easy recovery of non-heterogeneous catalyst, and was also superior to monoton phosphotungstic acid quaternary ammonium salt in terms of recovery rate. Under the conditions of the mass of oleic acid 1 g, mass ratio of oxidant to oleic acid 2.5, stabilizer (sodium stannate) dosage 0.5% of the oxidant (30% H2O2) mass, catalyst dosage 8% of oleic acid mass, reaction temperature 90 ℃ and reaction time 4 h, the yields of azelaic acid and pelargonic acid were 85.1% and 90.8% respectively. When the catalyst was reused for four times, the yields of azelaic acid were still above 82%. |
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