Process for synthesizing p-methoxy benzaldehyde or p-tertbutyl benzaldehyde
A technology of p-methoxybenzaldehyde and p-methoxytoluene, which is applied in the field of substituted toluene oxidation to prepare substituted benzaldehyde, can solve problems such as complicated separation process, achieve the effects of reducing pollution, avoiding waste water containing sodium sulfate, and reducing emissions
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Embodiment 1
[0016] In a 1000mL reaction flask, add 525mL of p-methoxytoluene, 150mL of glacial acetic acid, 50g of cobalt acetate and 30g of sodium bromide, stir, heat to 45°C, and pass oxygen for 4h to complete the reaction; add 800mL of water twice to wash the reaction liquid, to remove catalyst and acetic acid.
[0017] Add 200mL of monomethylbiphenyl to the oil phase after water washing, mix evenly, and desolvate under reduced pressure (-0.09MPa, 85-90℃) to remove p-methoxytoluene; continue to increase the rectification temperature (-0.098MPa, 100 -105°C), gas phase condensation to obtain p-methoxybenzaldehyde (light yellow liquid, acid value: ≤1.0mgKOH / g, content 99.3%); increase the rectification temperature again (-0.098MPa, 118-123°C), distill P-methoxybenzoic acid is discharged, and the gas-phase p-methoxybenzoic acid is passed into the water absorption tower, cooled and crystallized, and p-methoxybenzoic acid (white powder crystals, melting point range 181-185°C) is obtained aft...
Embodiment 2
[0019] In a 1000mL reaction flask, add 700mL of p-tert-butyltoluene, 20mL of glacial acetic acid, 10g of cobalt acetate and 4.5g of sodium bromide, stir, heat to 45°C, and pass oxygen for 4h to complete the reaction; add 1000mL of water twice to wash the reaction liquid , to remove catalyst and acetic acid.
[0020] Add 260mL of biphenyl-biphenyl ether low-melting mixture to the oil phase after water washing, mix well, and carry out desolvation under reduced pressure (-0.09MPa, 80-86°C) to remove excess p-tert-butyltoluene; continue to increase the rectification Temperature (-0.098MPa, 98-104°C), gas phase condensation to obtain p-tert-butylbenzaldehyde (light yellow liquid, content 99.2%); increase the rectification temperature again (-0.098MPa, 114-118°C), remove p-tert-butylbenzaldehyde tert-butylbenzoic acid, p-tert-butylbenzoic acid in the gas phase is passed into the water absorption tower, cooled and crystallized, recrystallized and dried to obtain p-tert-butylbenzoic a...
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