Preparation method of anisic aldehyde
A technology of anisaldehyde and anethole, which is applied in the field of preparation of anisaldehyde, can solve the problems of high cost and price, pollution of three wastes, and low yield, and achieve the effects of large-scale industrial production, less pollution, and less corrosion
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Embodiment 1
[0042] The raw material natural Artemisinin with a purity of 50% is put into a rectification tower for purification. The temperature of the bottom of the rectification tower is 160°C and the temperature at the top of the tower is 120°C to obtain purified Artemisinin with a purity of About 98%.
[0043] Put the purified wormwood into the isomerization pot, then add catalyst potassium hydroxide to the isomerization pot, control the temperature in the isomerization pot to 180°C, and react for 4 hours. After the reaction, stop the isomerization pot. Heated to get anethole. Wherein, the quality of the potassium hydroxide added is 5% of the quality of the purified Artemisinin.
[0044] Freeze the anethole at minus 20°C, and centrifuge the anethole under the freezing condition for 20 minutes to obtain high-purity anethole.
[0045] Put 1000kg of high-purity anethole into the reactor, and add 200kg of dilute sulfuric acid, 300kg of MnO 2 , control the temperature in the reactor to ...
Embodiment 2
[0050] The raw material natural wormwood is put into a rectification tower for purification, the temperature of the bottom of the rectification tower is 150° C., and the temperature of the top of the tower is 110° C. to obtain the purified wormwood.
[0051] Put the purified wormwood into the heterogeneous pot, then add potassium hydroxide into the heterogeneous pot, control the temperature in the heterogeneous pot to 185°C, and react for 3 hours. After the reaction is over, stop heating the heterogeneous pot , get anethole. Wherein, the quality of the potassium hydroxide added is 3% of the quality of the purified Artemisinin.
[0052] The anethole is frozen below -20°C, and the anethole is centrifuged under the freezing condition for 50 minutes to obtain high-purity anethole.
[0053] Put 1000kg of high-purity anethole into the reactor, and add 100kg of dilute sulfuric acid, 400kg of MnO 2 , control the temperature in the reactor to 100°C, react for 4 hours, and obtain the ...
Embodiment 3
[0058] The raw material natural wormwood is put into a rectification tower for purification, the temperature of the bottom of the rectification tower is 155° C., and the temperature of the top of the tower is 115° C. to obtain the purified wormwood.
[0059] Put the purified wormwood into the heterogeneous pot, then add potassium hydroxide into the heterogeneous pot, control the temperature in the heterogeneous pot to 175°C, and react for 5 hours. After the reaction, stop heating the heterogeneous pot , get anethole. Wherein, the quality of the potassium hydroxide added is 8% of the quality of the purified Artemisinin.
[0060] The anethole is frozen below -25° C., and the anethole is centrifuged under freezing conditions for 15 minutes to obtain high-purity anethole.
[0061] Put 1000kg of high-purity anethole into the reactor, and add 300kg of dilute sulfuric acid, 250kg of MnO 2 , Control the temperature in the reactor to 105°C, and react for 3h to obtain crude anisaldehy...
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