Flash tank for dilute cyclohexanone processing

Abstract

The utility model relates to the field of chemical equipment, and particularly discloses a flash tank for processing cyclohexanone by a dilute method, which is used for solving the problem of low gas-liquid separation efficiency in the prior art. Comprising a flash tank body, a gas phase outlet used for discharging separated gas is formed in the upper end of the flash tank body, an isolation ring plate is further rotationally arranged in the flash tank body, a feeding port used for feeding is formed in the lower side of the isolation ring plate, and a coalescence separation module used for assisting solid-liquid separation is arranged at the lower end of the isolation ring plate. And the lower end of the coalescence separation module is connected with the isolation bottom ring. Rotation torque is constructed in the flash tank body, so that airflow rotates, the rotating airflow assists in solid-liquid separation, in addition, an auxiliary liquid gathering structure is further arranged, liquid is rapidly separated from the airflow, the separated liquid is rapidly discharged under the action of centrifugal force, the rotation torque is generated through airflow power, and solid-liquid separation is achieved. Extra power is not needed, so that the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of chemical equipment, in particular to a flash tank used for processing dilute process cyclohexanone. Background Art

[0002] In recent years, the rapid development of domestic cyclohexanone production processes, particularly the cyclohexene hydration process, has rapidly become the industry's mainstream production process due to its advantages such as environmental friendliness and energy efficiency, minimal process side reactions, and low product impurity content. The most critical step in the cyclohexanone alkene production process is the partial hydrogenation of benzene to produce cyclohexene. In this reaction, benzene and hydrogen are used as raw materials, and the catalytic action of a ruthenium-zinc catalyst causes partial hydrogenation of benzene. However, in actual production, catalyst loss is common due to factors such as equipment maintenance, pipeline leaks, and inaccurate settling tank interface alignment. To maintain stable system operation, new catalyst must be continuously replenished, which undoubtedly increases production costs, and the loss of ruthenium-zinc catalyst is an increasingly prominent issue. Catalyst loss caused by inaccurate settling tank interface alignment is particularly difficult to control during the startup and shutdown of the plant.

[0003] More importantly, ruthenium, as a precious metal, is expensive and has an unstable supply. Its primary production areas are concentrated in countries such as South Africa, Russia, and Canada. Political, economic, and environmental changes in these regions could impact the mining and export of ruthenium, and thus the supply of ruthenium-zinc catalysts. With the widespread application of the olefin-based cyclohexanone process and the expansion of production capacity, the demand for ruthenium-zinc catalysts will continue to grow, undoubtedly increasing pressure on catalyst supply. Therefore, reducing ruthenium-zinc catalyst loss, improving catalyst efficiency, and finding more stable and economical catalyst alternatives have become key challenges facing the current cyclohexanone production process.

[0004] Existing flash tanks often struggle to achieve efficient separation of oil-water-catalyst mixtures due to the complex nature of the mixture and the catalyst. While conventional flash tanks can achieve separation to a certain extent, the efficiency is low. Therefore, it is necessary to optimize the internal structure of the flash tank to improve the separation efficiency of the oil-water-catalyst mixture.

[0005] Based on this, a flash tank for dilute process cyclohexanone processing is now provided, which can eliminate the disadvantages of the existing device. Utility Model Content

[0006] The purpose of the utility model is to provide a flash tank for processing dilute process cyclohexanone, which solves the problems in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] A flash tank for processing dilute cyclohexanone, comprising a flash tank body, wherein the upper end of the flash tank body is provided with a gas phase outlet for discharging separated gas, an isolation ring plate is rotatably provided inside the flash tank body, a feed port for feeding is provided on the lower side of the isolation ring plate, a coalescence separation module for assisting solid-liquid separation is provided at the lower end of the isolation ring plate, the lower end of the coalescence separation module is connected to an isolation bottom ring, and the isolation bottom ring is rotatably connected to the inner wall of the flash tank body, an aggregate cone is provided at the lower end of the flash tank body, and a water outlet pipe is provided at the bottom of the aggregate cone.

[0009] On the basis of the above technical solutions, the present invention also provides the following optional technical solutions:

[0010] In an optional scheme: the agglomeration and separation module includes a rotating agglomeration body, and a plurality of swirl blades are distributed in an array on the outside of the rotating agglomeration body. The swirl blades will accelerate the rotation of the raw materials when the rotating agglomeration body rotates. A cache inner cavity is provided inside the rotating agglomeration body, and a plurality of agglomeration ducts are distributed in an array on the upper end of the cache inner cavity. A plurality of metal wires for condensing the liquid are horizontally provided in the agglomeration ducts. A plurality of drainage branch pipes are distributed on the outside of the agglomeration ducts, and the outer side of the drainage branch pipes is connected to the drainage guide cavity inside the rotating agglomeration body. A drip pipe connected to the aggregate cone cavity is provided at the lower end of the drainage guide cavity. The upper end of the agglomeration duct passes through the upper partition inside the rotating agglomeration body and is connected to the upper chamber. A plurality of rotating jet pipes are distributed on the upper end of the rotating agglomeration body, and the jet outlet of the rotating jet pipe is set at an acute angle to the cross-section of the rotating agglomeration body.

[0011] In an optional solution, an upper side discharge port is further provided on the outer side of the upper end of the flash tank body.

[0012] In an optional solution, a plurality of drainage holes are distributed in an array on the outer side of the lower end of the rotating agglomerating body, and the inner ends of the drainage holes are connected to the upper end of the drip pipe.

[0013] In an optional solution, the position of the drainage hole corresponds to the upper end position of the isolation bottom ring.

[0014] In an optional solution, the coalescing conduit is inclined from bottom to top and outward.

[0015] In an optional solution, the angle between the axis of the coalescing conduit and the horizontal plane is no greater than seventy degrees.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] The utility model constructs a rotational torque inside the flash tank body, thereby causing the airflow to rotate. The rotating airflow assists in solid-liquid separation. In addition, an auxiliary liquid gathering structure is provided to enable the liquid to be quickly separated from the airflow. The separated liquid is quickly discharged under the action of centrifugal force. Here, the airflow power is used to generate the rotational torque, and there is no need to set up additional power, which helps to reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the present utility model.

[0019] Reference numerals: flash tank body 11, gas phase outlet 12, feed port 13, water outlet pipe 14, aggregate cone 15, isolation ring plate 16, upper side discharge port 17;

[0020] Rotating coalescing body 21 , drainage branch pipe 22 , coalescing conduit 23 , isolation bottom ring 24 , buffer inner cavity 25 , dripping pipe 26 , drainage guide cavity 27 , rotating jet pipe 28 , swirl blade 29 , upper partition 30 . DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] like Figure 1 As shown, the embodiment of the present invention provides a flash tank for processing dilute cyclohexanone, including a flash tank body 11, the upper end of the flash tank body 11 is provided with a gas phase outlet 12 for discharging the separated gas, the flash tank body 11 is further provided with a rotating isolation ring plate 16, the lower side of the isolation ring plate 16 is provided with a feed inlet 13 for feeding, the lower end of the isolation ring plate 16 is provided with a coalescence separation module for assisting solid-liquid separation, the lower end of the coalescence separation module is connected to the isolation bottom ring 24, and the isolation bottom ring 24 is connected to the The inner wall of the flash tank body 11 is rotatably connected. A collection cone 15 is provided at the lower end of the flash tank body 11. A water outlet pipe 14 is provided at the bottom of the collection cone 15. A coalescence separation module is added inside the flash tank body 11 to rotate the airflow. The cyclone separation principle is used to rotate the oil-water catalyst mixture in the cyclone structure to achieve rapid separation. A gas outlet is provided at the top of the cyclone structure and a liquid outlet is provided at the bottom to achieve gas-liquid separation. The module is used to collect the liquid flowing out of the cyclone structure so that the oil-water catalyst is further separated in the precipitation area.

[0023] An upper discharge port 17 is also provided on the outer side of the upper end of the flash tank body 11;

[0024] The agglomeration and separation module includes a rotating agglomeration body 21, a plurality of swirl blades 29 are arranged in an array on the outside of the rotating agglomeration body 21, and the swirl blades 29 accelerate the rotation of the raw materials when the rotating agglomeration body 21 rotates. A buffer cavity 25 is provided inside the rotating agglomeration body 21, and a plurality of agglomeration ducts 23 are arranged in an array on the upper end of the buffer cavity 25. A plurality of metal wires for condensing the liquid are horizontally arranged in the agglomeration duct 23, and a plurality of drainage branch pipes 22 are distributed on the outside of the agglomeration duct 23. The outside of the drainage branch pipe 22 is connected to the drainage guide cavity 27 inside the rotating agglomeration body 21. The lower end of the drainage diversion cavity 27 is provided with a drip pipe 26 connected to the inner cavity of the gathering cone 15. The upper end of the coalescing conduit 23 passes through the upper partition 30 inside the rotating coalescing body 21 and is connected to the upper chamber. A plurality of rotating air jets 28 are distributed on the upper end of the rotating coalescing body 21. The jet outlets of the rotating air jets 28 are arranged at an acute angle to the cross-section of the rotating coalescing body 21. In this way, the jets of the plurality of rotating air jets 28 constitute a rotational torque of the rotating coalescing body 21, thereby causing the rotating coalescing body 21 to rotate rapidly. The power generated by the rotation causes the liquid inside the rotating coalescing body 21 to flow outward, thereby assisting the liquid to flow downstream.

[0025] A plurality of drainage holes are arranged in an array on the outer side of the lower end of the rotating aggregate 21, and the inner ends of the drainage holes are connected to the upper end of the drip pipe 26, so that the liquid retained at the upper end of the isolation bottom ring 24 can be discharged;

[0026] The position of the drainage hole corresponds to the upper end of the isolation bottom ring 24 so that the liquid can be discharged smoothly;

[0027] The coalescing conduit 23 is inclined from bottom to top and outward, and the angle between the axis of the coalescing conduit 23 and the horizontal plane is not greater than 70 degrees, so that the liquid can be discharged to the outside more easily.

[0028] Working principle: After the raw material is fed into the flash tank body 11 along the feed port 13, the raw material first enters the buffer cavity 25 along the coalescing duct 23, and then flows upward along the coalescing duct 23. The liquid therein will gather into water droplets when it contacts the metal wire. Since the coalescing duct 23 is inclined, the liquid flows downward along the inclined surface of the coalescing duct 23 and is discharged along the drainage branch pipe 22. The liquid is discharged into the aggregate cone 15 along the drainage guide cavity 27 and the drip pipe 26. Finally, the solenoid valve on the outlet pipe 14 is opened to unload the material. The airflow is ejected along the upper end of the rotating jet pipe 28 to build a rotational torque. The rotating coalescing body 21 will rotate rapidly, thereby driving the swirl blades 29 to rotate. The swirl blades 29 will make the airflow rotate rapidly, accelerating the gas-liquid separation.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A flash tank for processing dilute cyclohexanone, comprising a flash tank body (11), wherein the upper end of the flash tank body (11) is provided with a gas phase outlet (12) for discharging separated gas, and wherein: An isolation ring plate (16) is rotatably provided inside the flash tank body (11), a feed port (13) for feeding is provided on the lower side of the isolation ring plate (16), a coalescence separation module for assisting solid-liquid separation is provided at the lower end of the isolation ring plate (16), the lower end of the coalescence separation module is connected to an isolation bottom ring (24), the isolation bottom ring (24) is rotatably connected to the inner wall of the flash tank body (11), a collection cone (15) is provided at the lower end of the flash tank body (11), and a water outlet pipe (14) is provided at the bottom of the collection cone (15).

2. The flash tank for processing dilute cyclohexanone according to claim 1, characterized in that: The coalescence separation module comprises a rotating coalescence body (21), a plurality of swirl blades (29) are arranged in an array on the outside of the rotating coalescence body (21), and the swirl blades (29) accelerate the rotation of the raw material when the rotating coalescence body (21) rotates. A buffer cavity (25) is provided inside the rotating coalescence body (21), and a plurality of coalescence ducts (23) are arranged in an array on the upper end of the buffer cavity (25). A plurality of metal wires for condensing liquid are arranged horizontally in the coalescence duct (23), and a plurality of liquid discharge separators are arranged on the outside of the coalescence duct (23). The outer side of the drainage branch pipe (22) is connected to the drainage guide cavity (27) inside the rotating agglomerating body (21); the lower end of the drainage guide cavity (27) is provided with a drip pipe (26) connected to the inner cavity of the aggregate cone (15); the upper end of the agglomerating conduit (23) passes through the upper partition (30) inside the rotating agglomerating body (21) and is connected to the upper chamber; a plurality of rotating air jet pipes (28) are distributed on the upper end of the rotating agglomerating body (21); the jet outlet of the rotating air jet pipe (28) is arranged at an acute angle to the cross section of the rotating agglomerating body (21).

3. The flash tank for processing dilute cyclohexanone according to claim 2, characterized in that: An upper discharge port (17) is also provided on the outer side of the upper end of the flash tank body (11).

4. The flash tank for processing dilute cyclohexanone according to claim 2, characterized in that: A plurality of drainage holes are distributed in an array on the outer side of the lower end of the rotating aggregation body (21), and the inner ends of the drainage holes are communicated with the upper end of the drip pipe (26).

5. The flash tank for processing dilute cyclohexanone according to claim 4, characterized in that: The position of the drainage hole corresponds to the upper end position of the isolation bottom ring (24).

6. The flash tank for processing dilute cyclohexanone according to claim 2, characterized in that: The coalescing conduit (23) is inclined from bottom to top and outward.

7. The flash tank for processing dilute cyclohexanone according to claim 2, characterized in that: The angle between the axis of the coalescing conduit (23) and the horizontal plane is not greater than seventy degrees.

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