Method for removing benzaldehyde impurities in benzyl alcohol
A technology for benzyl alcohol and benzaldehyde, which is applied in the field of removing benzaldehyde impurities in benzyl alcohol, can solve problems such as being difficult to achieve higher-purity product quality standards, and achieve the effects of easy control, content reduction and product quality improvement.
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Embodiment 1
[0028] Example 1: Nitrogen is used to replace the air in the vacuum rectification system with decompression (-0.06MPa) to the clean and dry vacuum rectification system with nitrogen gas with a purity of more than 99.9% for oil removal and water removal. Under certain conditions, the benzyl alcohol to be refined is added to the rectification system, and the rectification process is protected by nitrogen, and stirring and heating are started to control the temperature at 170°C for 30 minutes; a certain amount of sodium ethylate (to-be-refined 0.1% of the mass of benzyl alcohol), the temperature was controlled at 180°C for rectification, and the cuts were collected after 10 minutes, and the amount of the cuts was controlled at 15kg / hour. The content of benzyl alcohol in the product detection reaches more than 99.8%, the content of benzaldehyde ≤0.001%, cyclohexylmethanol ≤0.001%, benzyl chloride ≤0.0001%, dibenzyl ether ≤0.002%, benzene ≤0.00005%, peroxide ≤0.1 %, single unknown ...
Embodiment 2
[0029] Example 2: Nitrogen is used to replace the air in the clean and dry vacuum rectification system with nitrogen with a purity of more than 99.9% for oil removal and water removal; under reduced pressure (-0.10MPa), the Refined benzyl alcohol is added to the above-mentioned rectification system, and the rectification process is protected by nitrogen, and stirring and heating are started to control the temperature at 180°C for 50 minutes; a certain amount of sodium bisulfite (benzyl alcohol to be refined 0.5% of the mass), the temperature was controlled at 200°C for rectification, and the cut was collected after 30 minutes, and the amount of the cut was controlled at 20kg / hour. The content of benzyl alcohol in the product detection reaches more than 99.7%, the content of benzaldehyde ≤0.001%, cyclohexylmethanol ≤0.001%, benzyl chloride ≤0.0001%, dibenzyl ether ≤0.001%, benzene ≤0.00005%, peroxide ≤0.05 %, single unknown impurity ≤0.005%, total impurity ≤0.004%, moisture ≤0....
Embodiment 3
[0030] Example 3: Nitrogen is used to replace the air in the clean and dry vacuum rectification system with nitrogen with a purity of more than 99.9% for oil removal and water removal; under reduced pressure (-0.06MPa), the Refined benzyl alcohol was added to the above-mentioned rectification system, and the rectification process was protected by nitrogen, and stirring and heating were started to control the temperature at 200°C for 1 hour; a certain amount of 2,6-di-tert-butyl-4 - Cresol (0.1% of the mass of benzyl alcohol to be refined), its temperature is controlled at 210 ° C for rectification, and the cuts are collected after 1 hour and minutes, and the amount of the cuts is controlled at 30kg / hour. The content of benzyl alcohol is more than 99.9%, the content of benzaldehyde ≤0.001%, cyclohexylmethanol ≤0.001%, benzyl chloride ≤0.0001%, dibenzyl ether ≤0.001%, benzene ≤0.00005%, peroxide ≤0.03 %, single unknown impurity ≤0.002%, total impurity ≤0.005%, moisture ≤0.05%. ...
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