Method for catalytic dehydration of 4-hydroxy-3-hexanone
A technology for catalytic dehydration and hexanone, applied in chemical instruments and methods, preparation of carbon-based compounds, preparation of organic compounds, etc., can solve the problems of poor catalyst activity, high reaction temperature, low space velocity, etc., to avoid loss, combine Strong, long-lasting effect
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Embodiment 1
[0021] In the presence of benzene organic solvent, the silicon-based carrier SiO 2 with silylating reagent ClC 3 h 6 Si(OCH 3 ) 3 React at 80°C for 8 hours, filter, wash, and dry to obtain a silanized silicon-based carrier. Wherein, the weight ratio of the silylating agent to the silicon-based carrier is 2.5, and the weight ratio of the organic solvent to the silicon-based carrier is 3. In the presence of benzene organic solvent, the silanized silicon-based support and N-R 2 The imidazole was reacted at 90°C for 5 hours, filtered, washed and dried to obtain the precursor I. N-R 2 The weight ratio of imidazole to silanized silicon-based support is 3 times. Precursor I was reacted with the same amount of sulfuric acid at 50°C for 5 hours, filtered, washed, and dried to obtain catalyst A, whose structural formula is as follows.
[0022]
[0023] According to the above-mentioned method, synthesize catalyst B~D respectively, its structural formula is as follows:
[0024...
Embodiment 2
[0026] The performance evaluation of the catalyst was carried out on a fixed-bed reaction device under normal pressure. A stainless steel reactor with an inner diameter of 10 mm was used, and the loading amount of the catalyst was 10 ml, and the reaction was carried out under normal pressure. The reaction product was analyzed by HP 6890 gas chromatography, hydrogen flame detector, and HP-6 capillary column (60m×0.25mm×0.25μm). The experimental conditions and reaction results are shown in Table 1.
[0027] Table 1
[0028]
[0029] *: Contains isomers
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