Reaction system and method for preparing paraaminophenol through kettle type continuous hydrogenation
A technology of p-aminophenol and reaction system, which is applied in the field of reaction system for preparation of p-aminophenol by kettle-type continuous hydrogenation, can solve the problems affecting the output and quality of aminophenol products, limited production efficiency, etc. High efficiency, stable and uniform quality
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Embodiment 1
[0120] The reaction system for preparing p-aminophenol by kettle-type continuous hydrogenation of the present embodiment is as follows figure 1 As shown, there are three hydrogenation kettles including a primary hydrogenation kettle 201, a secondary hydrogenation kettle 202 and a tertiary hydrogenation kettle 203, and an overflow pipe 4 for transporting an alcoholic solution of p-nitrophenol is connected between the three. A balance pipe 3 for transferring hydrogen is connected.
[0121] The method utilizing above reaction system to prepare p-aminophenol may further comprise the steps:
[0122] (1) Preparation of the alcohol solution of p-nitrophenol: in the batching kettle, p-nitrophenol is dissolved in the solution of ethanol with a mass concentration of 45-60%, and the p-nitrophenol with a mass concentration of 20-40% is prepared alcoholic solution;
[0123]It should be noted that, before the first start-up of the hydrogenation kettle in step (2), p-nitrophenol is dissolv...
Embodiment 2
[0131] The reaction system for preparing p-aminophenol by kettle-type continuous hydrogenation of the present embodiment is as follows figure 1 As shown, there are three hydrogenation kettles including a primary hydrogenation kettle 201, a secondary hydrogenation kettle 202 and a tertiary hydrogenation kettle 203, and an overflow pipe 4 for transporting an alcoholic solution of p-nitrophenol is connected between the three. A balance pipe 3 for transferring hydrogen is connected.
[0132] The method utilizing above reaction system to prepare p-aminophenol may further comprise the steps:
[0133] (1) the preparation of the alcoholic solution of p-nitrophenol: in batching still, the p-nitrophenol of 5000kg is dissolved in the solution of the ethanol of 50% in the mass concentration of 10000kg, prepares the p-nitrophenol that obtains mass concentration 33% Alcoholic solution;
[0134] It should be noted that before the first start-up of the hydrogenation still in step (2), p-nit...
Embodiment 3
[0142] The reaction system for preparing p-aminophenol by kettle-type continuous hydrogenation of the present embodiment is as follows figure 1 As shown, there are three hydrogenation kettles including a primary hydrogenation kettle 201, a secondary hydrogenation kettle 202 and a tertiary hydrogenation kettle 203, and an overflow pipe 4 for transporting an alcoholic solution of p-nitrophenol is connected between the three. A balance pipe 3 for transferring hydrogen is connected.
[0143] The method utilizing above reaction system to prepare p-aminophenol may further comprise the steps:
[0144] (1) the alcohol solution preparation of p-nitrophenol: in batching still, the p-nitrophenol of 4000kg is dissolved in the solution of the ethanol of 50% in the mass concentration of 12000kg, prepares the p-nitrophenol that obtains mass concentration 25% Alcoholic solution;
[0145] It should be noted that before the first start-up of the hydrogenation still in step (2), p-nitrophenol ...
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Abstract
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