Cyclohexanone dehydration and hydrogenation device

Abstract

A cyclohexanone dehydration and hydrogenation device relates to the technical field of reaction devices and comprises a reaction kettle, the reaction kettle is rotatably provided with a vertically arranged hydrogen inlet pipe, a plurality of stirring plates are arranged on the peripheral wall of the hydrogen inlet pipe from top to bottom in parallel, a cavity is formed in the lowest stirring plate and communicated with the hydrogen inlet pipe, and the hydrogen inlet pipe is communicated with the cavity. Hydrogen distribution holes communicated with the inner cavity of the stirring plate are uniformly distributed in the side wall of the stirring plate, a hydrogen flow gathering cover is arranged at the position, close to the upper end part, of the reaction kettle, and a hydrogen backflow hole communicated with the inner cavity of the hydrogen inlet pipe is formed in the area, below the hydrogen flow gathering cover, of the hydrogen inlet pipe. The device solves the problems that in the reaction preparation process of cyclohexanone in the prior art, when hydrogen is added, the hydrogen cannot be ensured to be in uniform contact with materials due to the influence of a distribution structure, and the reaction efficiency of the materials is influenced; and the hydrogen is easy to gather at the top of the reaction kettle, so that the added hydrogen cannot fully act on the material, the input amount of the hydrogen is increased, and energy waste is caused.

Description

Technical Field

[0001] The utility model relates to the technical field of reaction devices, in particular to a cyclohexanone dehydration hydrogenation device. Background Art

[0002] Cyclohexanone is an important chemical raw material and the main intermediate for manufacturing nylon, caprolactam and adipic acid. It is also an important industrial solvent, such as paint, especially paint containing nitrocellulose, vinyl chloride polymer and its copolymer or methacrylate polymer. The most important part of cyclohexanone production is to inject hydrogen and benzene into the hydrogenation reactor together, and then convert them into cyclohexane under the action of catalyst.

[0003] The existing hydrogenation reactor uses pipelines to transport hydrogen when it is injected. For larger reactors, the gas flow effect is weak, which can easily cause insufficient reaction and a long reaction time.

[0004] The prior art discloses a patent with publication number CN217042591U, which includes a reactor, a heater is fixedly installed at the bottom end of the reactor, a rotating motor and an air pump are fixedly installed at the top end of the reactor, the output end of the rotating motor is fixedly connected to a rotating shaft, the rotating shaft extends into the bottom end of the reactor, a stirring blade is fixedly installed on the rotating shaft, the top end of the reactor is connected with a feed pipe and an air outlet pipe, the air outlet pipe is connected with the input end of the air pump, the side of the reactor is connected with an air inlet pipe, the air inlet pipe extends to the bottom end of the reactor, the bottom end of the reactor is connected with a discharge pipe, a water pump is fixedly installed outside the shell of the reactor, the input end of the water pump is connected to a water pumping pipe, and the output end of the water pump is connected to a drain pipe. The utility model can improve the conversion rate of phenol and make the reaction more complete.

[0005] As the existing technologies including the above patents are used, their shortcomings are gradually exposed, mainly in the following aspects:

[0006] First, during the reaction preparation process of cyclohexanone, when hydrogen is added, it is limited by the influence of the distribution structure and cannot ensure that hydrogen is in uniform contact with the material, which affects the reaction efficiency of the material and reduces the production efficiency of cyclohexanone.

[0007] Second, during the reaction preparation process of cyclohexanone, after hydrogen is added, it tends to gather at the top of the reactor, resulting in the added hydrogen being unable to fully act on the material, thereby increasing the input amount of hydrogen and causing energy waste.

[0008] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0009] In view of the defects in the prior art, the utility model solves the problems that in the reaction preparation process of cyclohexanone in the traditional technology, when hydrogen is added, it is limited by the influence of the distribution structure and it is impossible to ensure that the hydrogen is in uniform contact with the material, which affects the reaction efficiency of the material; and hydrogen is easily gathered at the top of the reactor, resulting in the added hydrogen being unable to fully act on the material, thereby increasing the input amount of hydrogen and causing energy waste.

[0010] In order to solve the above problems, the utility model provides the following technical solutions:

[0011] The cyclohexanone dehydration hydrogenation device comprises a reactor, wherein the reactor is rotatably provided with a vertically arranged hydrogen inlet pipe, a plurality of stirring plates are arranged in parallel from top to bottom on the peripheral wall of the hydrogen inlet pipe, a cavity is arranged on the stirring plate at the bottom, the cavity is connected to the hydrogen inlet pipe, and the side wall of the stirring plate is uniformly provided with hydrogen distribution holes connected to the inner cavity thereof,

[0012] A hydrogen condenser is provided near the upper end of the reactor, and a hydrogen reflux hole communicating with the inner cavity of the hydrogen condenser is provided in the area below the hydrogen condenser on the hydrogen inlet pipe.

[0013] As an optimized solution, a venturi tube is provided in the hydrogen inlet pipe, and the hydrogen reflux hole is connected to the lock section of the venturi tube.

[0014] As an optimized solution, the hydrogen collector includes a cover body fixedly connected to the inner wall of the reactor, the cover body is provided with a plurality of hydrogen flow holes along the center, and an adjustment plate for adjusting the area of ​​the hydrogen flow holes is rotatably provided under the hydrogen collector.

[0015] As an optimized solution, the hydrogen flow holes are arranged in a fan-shaped ring shape, and the regulating plate matches the fan-shaped ring.

[0016] As an optimized solution, a rotating tube is rotatably mounted on the hydrogen inlet tube, and the inner end of the regulating plate is fixedly connected to the outer wall of the rotating tube.

[0017] As an optimized solution, the upper end of the rotating tube extends upward through the reactor and is fixedly connected to a first gear ring. The upper end of the reactor is fixedly connected to a first reducer, and the output shaft of the first reducer is connected to a first gear meshing with the first gear ring.

[0018] As an optimized solution, the upper end of the hydrogen inlet pipe passes through the rotating pipe and extends upward, and a connecting pipe is rotatably inserted therein.

[0019] As an optimized solution, a second gear ring is fixedly connected to the outer wall of the hydrogen inlet pipe, a second reducer is fixedly connected to the upper end of the reactor by a bracket, and an output shaft of the second reducer is connected to a second gear meshing with the second gear ring.

[0020] As an optimized solution, the hydrogen distribution holes are arranged on the back side of the stirring plate in the rotation direction.

[0021] As an optimized solution, a plurality of hydrogen reflow holes are provided along the circumference of the inlet pipe.

[0022] As an optimized solution, the stirring plate is arranged to be inclined relative to the horizontal plane.

[0023] Compared with the prior art, the beneficial effects of the utility model are:

[0024] A hydrogen source is connected through a connecting pipe, and the hydrogen source is input into the hydrogen inlet pipe along the connecting pipe. A hydrogen distribution hole is opened in the stirring shell at the bottom, and the hydrogen is supplied from the bottom of the reactor by utilizing the property of hydrogen floating, so that the hydrogen in the floating process can also contact with the material, thereby increasing the contact area. The stirring shell is rotated while the hydrogen is distributed, thereby greatly increasing the contact area and efficiency between the hydrogen and the material, and improving the reaction efficiency of cyclohexanone.

[0025] A hydrogen focusing hood is set on the top of the reactor to block the hydrogen in the rising process, and a venturi tube is used to absorb the gathered hydrogen into the hydrogen reflow hole and then send it to the bottom of the reactor to mix with the material again, thereby improving the utilization rate of hydrogen.

[0026] By rotating the regulating plate, the area of ​​the hydrogen flow hole is adjusted, so that the concentration amount of hydrogen can be adjusted, thereby improving the flexibility of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0028] Figure 1 It is a schematic diagram of the structure of the utility model;

[0029] Figure 2 The utility model is a schematic diagram of the structure of the hydrogen focusing hood.

[0030] In the figure: 1-reactor; 2-hydrogen inlet pipe; 3-stirring plate; 4-hydrogen distribution hole; 5-venturi tube; 6-hood; 7-hydrogen flow hole; 8-adjusting plate; 9-hydrogen reflux hole; 10-rotating pipe; 11-connecting pipe; 12-first reducer; 13-second reducer; 14-first gear ring; 15-second gear ring. DETAILED DESCRIPTION

[0031] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0032] like Figure 1 and Figure 2 As shown, the cyclohexanone dehydration hydrogenation device comprises a reactor 1, wherein the reactor 1 is rotatably provided with a vertically arranged hydrogen inlet pipe 2, and a plurality of stirring plates 3 are arranged in parallel from top to bottom on the peripheral wall of the hydrogen inlet pipe 2, and a cavity is arranged on the stirring plate 3 at the bottom, and the cavity is connected to the hydrogen inlet pipe 2, and the side wall of the stirring plate 3 is uniformly provided with hydrogen distribution holes 4 connected to the inner cavity thereof,

[0033] A hydrogen condenser is provided near the upper end of the reactor 1, and a hydrogen reflux hole 9 communicating with the inner cavity of the hydrogen inlet pipe 2 is provided in the area below the hydrogen condenser.

[0034] A venturi tube 5 is provided in the hydrogen inlet pipe 2 , and the hydrogen reflux hole 9 is connected to the lock mouth section of the venturi tube 5 .

[0035] The hydrogen collector comprises a cover body 6 fixedly connected to the inner wall of the reactor 1 , with a plurality of hydrogen flow holes 7 opened along the center of the cover body 6 , and an adjusting plate 8 for adjusting the area of ​​the hydrogen flow holes 7 is rotatably arranged under the hydrogen collector.

[0036] The hydrogen flow hole 7 is arranged in a fan-shaped ring shape, and the adjustment plate 8 matches it.

[0037] A rotating tube 10 is rotatably mounted on the hydrogen inlet tube 2 , and the inner end of the regulating plate 8 is fixedly connected to the outer wall of the rotating tube 10 .

[0038] The upper end of the rotating tube 10 extends upward through the reactor 1 and is fixedly connected to a first gear ring 14 . The upper end of the reactor 1 is fixedly connected to a first reducer 12 , and the output shaft of the first reducer 12 is connected to a first gear meshing with the first gear ring 14 .

[0039] The upper end of the hydrogen inlet pipe 2 passes through the rotating pipe 10 and extends upward, and a connecting pipe 11 is rotatably inserted therein.

[0040] A second gear ring 15 is fixedly connected to the outer wall of the hydrogen inlet pipe 2 , and a second reducer 13 is fixedly connected to the upper end of the reactor 1 by a bracket. The output shaft of the second reducer 13 is connected to a second gear meshing with the second gear ring 15 .

[0041] The hydrogen distribution holes 4 are arranged on the back side of the stirring plate 3 in the rotation direction.

[0042] A plurality of hydrogen reflux holes 9 are arranged along the circumference of the inlet pipe.

[0043] The stirring plate 3 is arranged to be inclined to the horizontal plane.

[0044] The other valve pipe structures involved in the reactor 1 are the same as those in the prior art, and are not shown in the figure because they do not belong to the innovation of this solution.

[0045] The working principle of this device is:

[0046] A hydrogen source is connected through a connecting pipe 11, and the hydrogen source is input into the hydrogen inlet pipe 2 along the connecting pipe 11. A hydrogen distribution hole 4 is provided in the stirring shell at the bottom, and the hydrogen is supplied from the bottom of the reactor 1 by utilizing the property of hydrogen floating, so that the hydrogen in the floating process can also contact with the material, thereby increasing the contact area. The stirring shell is rotated while the hydrogen is distributed, thereby greatly increasing the contact area and efficiency between the hydrogen and the material, and improving the reaction efficiency of cyclohexanone;

[0047] By setting a hydrogen focusing hood on the top of the reactor 1, the hydrogen in the rising process is blocked, and the venturi tube 5 is used to absorb the gathered hydrogen into the hydrogen reflow hole 9, and then sent to the bottom of the reactor 1 to mix with the material again, thereby improving the utilization rate of hydrogen;

[0048] By rotating the adjusting plate 8, the area of ​​the hydrogen flow hole 7 is adjusted, so that the concentration amount of hydrogen can be adjusted, thereby improving the flexibility of use.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. Cyclohexanone dehydration hydrogenation device, characterized in that: The invention comprises a reaction kettle (1), wherein the reaction kettle (1) is rotatably provided with a vertically arranged hydrogen inlet pipe (2), a plurality of stirring plates (3) are arranged in parallel from top to bottom on the peripheral wall of the hydrogen inlet pipe (2), a cavity is arranged on the stirring plate (3) at the bottom, the cavity is connected to the hydrogen inlet pipe (2), and the side wall of the stirring plate (3) is evenly provided with hydrogen distribution holes (4) connected to the inner cavity thereof, The reactor (1) is provided with a hydrogen condenser near the upper end, and the hydrogen inlet pipe (2) is provided with a hydrogen reflux hole (9) in communication with the inner cavity thereof in the area below the hydrogen condenser.

2. The cyclohexanone dehydration hydrogenation device according to claim 1, characterized in that: A venturi tube (5) is provided in the hydrogen inlet pipe (2), and the hydrogen reflow hole (9) is connected to the lock section of the venturi tube (5).

3. The cyclohexanone dehydration hydrogenation device according to claim 2, characterized in that: The hydrogen collector comprises a cover body (6) fixedly connected to the inner wall of the reactor (1), the cover body (6) is provided with a plurality of hydrogen flow holes (7) along the center, and an adjustment plate (8) for adjusting the area of ​​the hydrogen flow holes (7) is rotatably provided below the hydrogen collector.

4. The cyclohexanone dehydration hydrogenation device according to claim 3, characterized in that: The hydrogen flow hole (7) is arranged in a fan-shaped ring shape, and the regulating plate (8) matches it.

5. The cyclohexanone dehydration hydrogenation device according to claim 4, characterized in that: A rotating tube (10) is rotatably mounted on the hydrogen inlet pipe (2), and the inner end of the regulating plate (8) is fixedly connected to the outer wall of the rotating tube (10).

6. The cyclohexanone dehydration hydrogenation device according to claim 5, characterized in that: The upper end of the rotating tube (10) passes through the reactor (1) and extends upward, and is fixedly connected to a first gear ring (14); the upper end of the reactor (1) is fixedly connected to a first reducer (12); the output shaft of the first reducer (12) is connected to a first gear meshing with the first gear ring (14).

7. The cyclohexanone dehydration hydrogenation device according to claim 6, characterized in that: The upper end of the hydrogen inlet pipe (2) passes through the rotating pipe (10) and extends upward, and is rotatably inserted with a connecting pipe (11).

8. The cyclohexanone dehydration hydrogenation device according to claim 7, characterized in that: A second gear ring (15) is fixedly connected to the outer wall of the hydrogen inlet pipe (2), a second reducer (13) is fixedly connected to the upper end of the reactor (1) by means of a bracket, and an output shaft of the second reducer (13) is connected to a second gear meshing with the second gear ring (15).

9. The cyclohexanone dehydration hydrogenation device according to claim 8, characterized in that: The hydrogen distribution holes (4) are arranged on the back side of the stirring plate (3) in the rotation direction.

10. The cyclohexanone dehydration hydrogenation device according to claim 9, characterized in that: A plurality of hydrogen reflux holes (9) are arranged along the circumference of the inlet pipe.

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