Method for preparing benzaldehyde through styrene catalytic oxidation
A technology for catalytic oxidation and styrene, which is applied in the preparation of carbon-based compounds, chemical instruments and methods, and the preparation of organic compounds. Effect of high conversion rate and yield improvement
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Embodiment 1
[0021] In the reaction flask, 2.5 g of styrene, 0.5 g of gold nanowire toluene solution (wherein, about 0.5 mg of gold nanowire, diameter less than or equal to 5 nm), and 14.5 g of toluene are loaded into the reaction flask; the system is connected with an oxygen bag and a condenser tube, Then cool down-vacuumize-release oxygen, cycle 3-4 times, put in oxygen, and return to room temperature; the system is heated in an oil bath at 100°C for 24 hours to obtain the product.
[0022] Get product and carry out gas-mass coupling (GC-MS) and gas chromatography (GC) analysis, the result is as follows: transformation rate: 54.3%; Benzaldehyde, benzo epoxy, the selectivity of acetophenone are respectively 51.6%, 43.1%; % and 5.3%, the yield of benzaldehyde is 28.0%.
Embodiment 2
[0024] In the reaction flask, 2.5 g of styrene, 0.8 g of gold nanowire toluene solution (wherein, about 0.8 mg of gold nanowire and a diameter less than or equal to 5 nm), and 14.2 g of toluene are loaded into the reaction flask; the system is connected with an oxygen bag and a condenser tube, Then cool down-vacuumize-release oxygen, cycle 3-4 times, put in oxygen, and return to room temperature; the system is heated in an oil bath at 100°C for 25 hours to obtain the product.
[0025] Get product and carry out gas-mass coupling (GC-MS) and gas chromatography (GC) analysis, the result is as follows: transformation rate: 54.7%; Benzaldehyde, benzo epoxy, the selectivity of acetophenone are respectively 52.0%, 44.5%; % and 3.5%, the yield of benzaldehyde is 28.4%.
[0026] Measured the impact of reaction time simultaneously, the result is as follows:
[0027]
[0028] It can be seen that with the increase of the reaction time, the conversion rate of styrene and the yield of b...
Embodiment 3
[0030] In the reaction flask, 2.5 g of styrene, 1.2 g of gold nanowire toluene solution (wherein, about 1.2 mg of gold nanowire and a diameter less than or equal to 5 nm), and 13.8 g of toluene are loaded into the reaction flask; the system is connected with an oxygen bag and a condenser tube, Then cool down-vacuumize-release oxygen, cycle 3-4 times, put in oxygen, and return to room temperature; the system is heated in an oil bath at 100°C for 24 hours to obtain the product.
[0031] Get product and carry out gas-mass coupling (GC-MS) and gas chromatography (GC) analysis, the result is as follows: transformation rate: 43.6%; Benzaldehyde, benzo epoxy, the selectivity of acetophenone are respectively 66.1%, 30.8%; % and 3.1%, the yield of benzaldehyde is 28.8%.
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