Apparatus and method for preparing aminobenzene by nitrobenzene gas-phase hydrogenation
A technology for the preparation of nitrobenzene gas and hydrogen, which is applied in the preparation of amino compounds, chemical instruments and methods, preparation of organic compounds, etc., to achieve the effects of reducing dosage, increasing safety, and reducing investment costs
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[0050] The process method for preparing aniline according to the present invention is specifically as follows:
[0051] A metal-supported catalyst with an average particle diameter of 45-300 microns is introduced into the reactor from the catalyst inlet 4. In order to allow all the catalyst to enter the reactor, nitrogen or air is introduced through the gas distributor 12 at the gas feed inlet 1 at the bottom of the reactor when the catalyst is added. Under the loosening of nitrogen or air with a small gas flow, the catalyst particles enter the reactor from the catalyst inlet 4 and mainly stay in the dense phase zone 14 of the first catalyst. After the catalyst is loaded into the reactor, the gas in the reactor is replaced by an inert gas to an oxygen-free state. During this period, the temperature was gradually increased to 200-300°C, and then hydrogen was cut in to perform catalyst reduction. During the reduction, the gas velocity in the reactor is controlled between 0.05-0.6m / s...
Example Embodiment
[0056] Example 1:
[0057] In such figure 1 The reaction is carried out in the two-stage fluidized bed device shown for the gas phase hydrogenation of nitrobenzene to prepare aniline. The feed is hydrogen and nitrobenzene, the molar ratio is 20:1; the operating pressure (absolute pressure) is 0.25MPa; the temperature of the dense phase zone of the first catalyst is 240°C, and the temperature of the dense phase zone of the second catalyst is 270°C; Weight airspeed is 0.26 hours -1 , The actual gas velocity in the dense phase zone of the first catalyst is 0.45m / s. The conversion rate of nitrobenzene is 99.9993%, and the selectivity is 99.90%.
Example Embodiment
[0058] Example 2:
[0059] In such figure 1 The reaction is carried out in the two-stage fluidized bed device shown for the gas phase hydrogenation of nitrobenzene to prepare aniline. The feed is hydrogen and nitrobenzene, the molar ratio is 15:1; the operating pressure (absolute pressure) is 0.4MPa; the temperature of the dense phase zone of the first catalyst is 240°C, and the temperature of the dense phase zone of the second catalyst is 285°C; The weight airspeed is 0.4 hours -1 , The actual gas velocity in the dense phase zone of the first catalyst is 0.45m / s. The conversion rate of nitrobenzene is 99.999%, and the selectivity is 99.87%.
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