The invention discloses a method for producing
benzaldehyde by oxidizing
dibenzyl ether by air, comprising the following steps: feeding the
dibenzyl ether produced in the
benzaldehyde working section into a
dibenzyl ether head tank, carrying out the
benzaldehyde pilot production after the liquid level is more than 60% of the height of the dibenzyl
ether head tank; adding material into an
electric heating reactor from the dibenzyl
ether head tank until the liquid level is 80% of the height of the
electric heating reactor, and heating to
increase temperature; obtaining the water in the dibenzyl
ether by
steaming, and pouring the water removed by
steaming into the benzaldehyde working section; after finishing obtaining the water by
steaming, increasing the temperature of the
electric heating reactor so that the oil-phase material in a return
pipe reflows; introducing air into the electric heating reactor, decreasing the temperature of the electric heating reactor along with reaction; stopping heating when the temperature of the electric heating reactor decreases to 200-210 DEG C; stopping introducing air when the temperature of the electric heating reactor continuously decreases to 190-200 DEG C; pumping the material in the electric heating reactor into a rectifying reactor under the vacuum condition; obtaining light components by steaming by a rectifying
tower, and performing secondary refining on the light components via recycling; obtaining the finished product which is the benzaldehyde by steaming, putting the benzaldehyde into a
barrel, and packaging; obtaining heavy components by steaming, and performing secondary refining on the components via recycling; removing
slag; and analyzing the finished product which is the benzaldehyde by using the
gas chromatography. The benzaldehyde is colorless and transparent, and has the fragrant bitter almond
flavor.