Method for preparing caprolactam
A technology of caprolactam and cyclohexanone oxime, which is applied in the field of preparation of caprolactam, can solve the problems of catalyst surface coking, etc., and achieve the effects of improving production efficiency, reducing the risk of device shutdown, and reducing catalyst coking
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[0029] In the method for preparing caprolactam provided by the application, the carrier gas is used to gasify cyclohexanone oxime to obtain a gasified product, and then the cyclohexanone oxime is transported in the gasified product to a multi-phase communication network under the action of the carrier gas. The gas-phase Beckmann rearrangement reaction occurs in the fixed-bed reactor. Due to the gasification of the carrier gas, the concentration of cyclohexanone oxime decreases at high temperature, so the non-toxicity that occurs during the single feeding process of cyclohexanone oxime is effectively controlled. Catalytic carbonization phenomenon, thereby effectively reducing catalyst coking and deactivation, prolonging catalyst service life, thereby reducing the risk of device shutdown caused by catalyst replacement, and improving the production efficiency of caprolactam.
[0030] Typically but not limitatively, the above n is 2, 3, 4, 5 or 6, for example.
[0031] In order to...
Embodiment 1
[0057] This embodiment provides a method for preparing caprolactam, the process flow diagram is as follows figure 1 shown, including the following steps:
[0058] (1) The cyclohexanone oxime methanol solution with a water content of 1% and a concentration of 20% are mixed and gasified in the falling film evaporator 201 to obtain a gasified product; wherein, the gasification temperature is 175° C. and the pressure is 0.25 MPaG, the molar ratio of nitrogen to cyclohexanone oxime is 15:1.
[0059] (2) The gasification is divided into the first gasification, the second gasification and the third gasification, the mass ratio of the three is 50:25:25, and the three gasifications are respectively passed into the reactor for gas-phase Beckmann rearrangement Reaction, the mass space velocity of cyclohexanone oxime is 1h -1 , the temperature in the reactor is 360°C, and the pressure is 0.25MPa, such as figure 1 As shown, the reactor includes a first fixed bed layer 101, a second fixe...
Embodiment 2
[0061] This embodiment provides a method for preparing caprolactam, which is different from Example 1 in that in step (2), the gasified product is divided into a first gasified product and a second gasified product, and the mass ratio of the two is 60 : 40, and the reactor comprises the first fixed bed and the second fixed bed, the catalyst of two fixed bed equal loads is the same as embodiment 1, the top of the first fixed bed is provided with the first gasification product inlet, the second The top of the two fixed beds is provided with a second gasification feeding port, and the first gasification is added to the first fixed bed from the first gasification inlet to react to form the first reaction product, and the first reaction product is combined with the gasification from the second gasification The second gasified product fed into the feeding port is mixed and enters the second fixed bed for reaction to generate a second reaction product, which is discharged from the rea...
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