A kind of method for producing ortho/p-chlorobenzaldehyde by low-temperature catalytic oxidation
A technology of p-chlorobenzaldehyde and low-temperature catalysis, which is applied in the field of preparation of o-/p-chlorobenzaldehyde, can solve the problems of high reaction temperature, low product selectivity, unfavorable product separation, etc. The effect of low consumption, short process route and green process
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Embodiment 1
[0038] 30.1g Mg 0.1 co 0.5 Ti 0.9 Zr 1.0 o x The composite oxide catalyst is loaded into a quartz reaction tube with a diameter of 20mm, and the reaction tube is installed on the trickle bed reactor, and the space velocity is 500h -1 Nitrogen was introduced, and the temperature was raised to 450°C to activate the catalyst. The activation time was 6 hours. After the catalyst activation was completed, the temperature was lowered to 80.3°C under the protection of nitrogen. Add the mixed solution of pyridine and o- and p-chlorotoluene into the mixing kettle according to the mass ratio of 0.51%, and stir evenly. -1 The mass space velocity is continuously added to the reactor from the upper part of the trickle bed reactor, and at the same time, the nitrogen-oxygen mixed gas oxidant with an oxygen content of 30% is pressed for 710h -1 The volumetric space velocity is continuously fed into the reactor from the bottom of the trickle bed reactor, and the reaction temperature of the...
Embodiment 2
[0041] 30.0g Mg 0.1 co 0.5 Ti 0.9 Zr 1.0 ox The composite oxide catalyst is loaded into a quartz reaction tube with a diameter of 20mm, and the reaction tube is installed on the trickle bed reactor, and the space velocity is 500h -1 Nitrogen was introduced, and the temperature was raised to 450°C to activate the catalyst. The activation time was 6 hours. After the catalyst activation was completed, the temperature was lowered to 119.5°C under the protection of nitrogen. Add the mixed solution of pyridine and o- and p-chlorotoluene into the mixing tank according to the mass ratio of 4.9%, and stir evenly. -1 The mass space velocity is continuously added to the reactor from the upper part of the trickle bed reactor, and the nitrogen-oxygen mixed gas oxidant with an oxygen content of 30% is pressed for 1980h -1 The volumetric space velocity is continuously fed into the reactor from the bottom of the trickle bed reactor, and the reaction temperature of the catalytic oxidation ...
Embodiment 3
[0044] 30.1g Mg 0.1 co 0.5 Ti 0.9 Zr 1.0 o x The composite oxide catalyst is loaded into a quartz reaction tube with a diameter of 20mm, and the reaction tube is installed on the trickle bed reactor, and the space velocity is 500h -1 Nitrogen was introduced, and the temperature was raised to 450°C to activate the catalyst. The activation time was 6 hours. After the catalyst activation was completed, the temperature was lowered to 100.8°C under the protection of nitrogen. Add the mixed solution of pyridine and o- and p-chlorotoluene into the mixing kettle according to the mass ratio of 2.51%, and stir evenly. -1 The mass space velocity is continuously added to the reactor from the upper part of the trickle bed reactor, and at the same time, the nitrogen-oxygen mixed gas oxidant with an oxygen content of 30% is pressed for 1400h -1 The volumetric space velocity is continuously fed into the reactor from the bottom of the trickle bed reactor, and the reaction temperature of t...
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