Efficient bubble tower for synthesizing monochlorophthalic anhydride

Abstract

The utility model discloses an efficient bubbling tower for synthesizing monochlorophthalic anhydride, which comprises a tower body, a plurality of chlorine gas inlet ports which are equidistantly arranged along the vertical direction are arranged on the side wall of the tower body, a plurality of gas uniform distribution plates are arranged in an inner cavity of the tower body, and each gas uniform distribution plate consists of an inner ring pipe, an outer ring pipe, a connecting straight pipe and a gas inlet pipe, a plurality of air holes which are spirally distributed are formed in the pipe walls of the inner ring pipe, the outer ring pipe and the connecting straight pipe; the gas inlet pipe penetrates in the horizontal direction and is fixed in the chlorine gas inlet port, and the outer end part of the gas inlet pipe is connected into the chlorine gas conveying pipe through a tee joint; spiral paddles are respectively arranged above the gas uniform distribution disc, the spiral paddles are arranged on a main shaft, and the main shaft penetrates through an inner ring pipe of the gas uniform distribution disc along the vertical direction. The high-efficiency bubbling tower provided by the utility model can solve the problems of non-uniform gas distribution amount and low bubbling success rate, and can enable chlorine and molten phthalic anhydride to be fully mixed and uniformly contacted to realize high-efficiency reaction.

Description

Technical Field

[0001] The utility model relates to an efficient bubble column for synthesizing monochlorophthalic anhydride, belonging to the technical field of synthesizing monochlorophthalic anhydride. Background Art

[0002] A bubble column is a commonly used gas-liquid contact reaction device, which refers to a device in which gas bubbles through a liquid layer containing reactants or catalysts to achieve a gas-liquid phase reaction process. It is suitable for slow chemical reactions and strong exothermic situations.

[0003] At present, the synthesis of monochlorophthalic anhydride requires the use of a bubble column. The bubble column is filled with molten phthalic anhydride flowing upward from bottom to top. Chlorine gas is introduced horizontally from the side inlet of the tower, dispersed into bubbles and rises along the molten phthalic anhydride, and undergoes a monosubstitution reaction with phthalic anhydride to produce the product monochlorophthalic anhydride.

[0004] In the prior art, the bubble column for synthesizing monochlorophthalic anhydride generally adopts a single-layer tube layout for bubbling, which is prone to uneven gas distribution and low bubbling success rate, resulting in a large room for improvement in the reaction efficiency between chlorine gas and molten phthalic anhydride.

[0005] To sum up, the prior art obviously has inconveniences and defects in actual use, so it is necessary to improve. Summary of the Utility Model

[0006] Aiming at the deficiencies in the background art, the utility model provides an efficient bubble column for synthesizing monochlorophthalic anhydride, which can solve the problems of uneven gas distribution and low bubbling success rate, and can make chlorine gas and molten phthalic anhydride fully mixed and evenly contacted to achieve efficient reaction.

[0007] To solve the above technical problems, the utility model adopts the following technical solutions:

[0008] An efficient bubble column for synthesizing monochlorophthalic anhydride, including a tower body, and a plurality of chlorine gas inlet ports are equidistantly arranged along the vertical direction on the side wall of the tower body;

[0009] A plurality of gas distribution plates are installed in the inner cavity of the tower body. The gas distribution plate is composed of an inner ring pipe, an outer ring pipe, connecting straight pipes and an air inlet pipe. A plurality of spiral-shaped pores are formed on the pipe walls of the inner ring pipe, the outer ring pipe and the connecting straight pipes; the air inlet pipe is horizontally penetrated and fixed in the chlorine gas inlet port, and the outer end of the air inlet pipe is connected to the chlorine gas delivery pipe through a tee;

[0010] Spiral blades are respectively arranged above the gas distribution plates. The spiral blades are installed on a main shaft, and the main shaft penetrates through the inner ring pipe of the gas distribution plate along the vertical direction.

[0011] Furthermore, the outer ring pipe is sleeved outside the inner ring pipe, and the inner ring pipe and the outer ring pipe are in the same plane.

[0012] Further, the inner ring pipe and the outer ring pipe are connected by a plurality of connecting straight pipes distributed in a circumferential manner, and both ends of the connecting straight pipes are fixedly connected to the inner ring pipe and the outer ring pipe respectively.

[0013] Further, the inner end of the air inlet pipe is connected to the inner ring pipe, and the inner cavities are communicated.

[0014] Further, a phthalic anhydride inlet port is provided at the bottom end of the tower body.

[0015] Further, a discharge port and a tail gas outlet port are provided on both sides of the top end of the tower body, and the height of the tail gas outlet port is greater than that of the discharge port.

[0016] Further, the chlorine gas delivery pipe is installed outside the tower body in the vertical direction.

[0017] Further, the top end of the main shaft is connected to the motor at the top of the tower body through a coupling.

[0018] After the present utility model adopts the above technical solutions, compared with the prior art, it has the following advantages:

[0019] By providing a plurality of gas distribution plates, the air flow can be shunted. The gas distribution plates evenly distribute chlorine gas through a number of spiral-shaped pores on the pipe wall for bubbling, ensuring the success rate of bubbling. The bubbles undergo a single substitution reaction with phthalic anhydride during the upward movement;

[0020] By respectively providing rotatable spiral blades above the gas distribution plates, a certain stirring and mixing function is achieved, enabling the chlorine gas and molten phthalic anhydride to be fully mixed and evenly contacted, realizing an efficient reaction.

[0021] The present utility model will be described in detail below with reference to the accompanying drawings and embodiments. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of the present utility model;

[0023] Figure 2 is an installation schematic diagram of the gas distribution plate;

[0024] Figure 3 is a schematic structural diagram of the gas distribution plate.

[0025] In the figure, 1 - tower body; 2 - phthalic anhydride inlet port; 3 - chlorine gas inlet port; 4 - discharge port; 5 - tail gas outlet port; 6 - gas distribution plate, 61 - inner ring pipe, 62 - outer ring pipe, 63 - connecting straight pipe, 64 - pore, 65 - air inlet pipe; 7 - tee; 8 - chlorine gas delivery pipe; 9 - spiral blade; 10 - main shaft; 11 - coupling; 12 - motor. Detailed Embodiments

[0026] In order to have a clearer understanding of the technical features, objectives, and effects of the present utility model, the specific embodiments of the present utility model will now be described with reference to the accompanying drawings.

[0027] As Figures 1-3 Collectively shown, the present utility model provides a high-efficiency bubbling tower for synthesizing monochlorophthalic anhydride, which includes a tower body 1 with a vertical structure. A phthalic anhydride inlet port 2 is provided at the bottom end of the tower body 1, and molten phthalic anhydride is pumped into the inner cavity of the tower body 1 from here and flows upward.

[0028] There are multiple chlorine inlet ports 3 on the side wall of the tower body 1, and the chlorine inlet ports 3 are arranged at equal intervals in the vertical direction.

[0029] On both sides of the top end of the tower body 1, there are a discharge port 4 and a tail gas outlet port 5. The height of the tail gas outlet port 5 is greater than that of the discharge port 4. The discharge port 4 is used for the output of monochlorophthalic anhydride, and the tail gas outlet port 5 is used for the discharge of tail gases such as hydrogen chloride.

[0030] A plurality of gas distribution plates 6 arranged at equal intervals in the vertical direction are installed in the inner cavity of the tower body 1. The gas distribution plate 6 is composed of an inner ring pipe 61, an outer ring pipe 62, connecting straight pipes 63, and an inlet pipe 65.

[0031] The outer ring pipe 62 is sleeved outside the inner ring pipe 61. The inner ring pipe 61 and the outer ring pipe 62 are in the same plane. The inner ring pipe 61 and the outer ring pipe 62 are connected by a plurality of connecting straight pipes 63 distributed in a circular pattern. The two ends of the connecting straight pipe 63 are fixedly connected to the inner ring pipe 61 and the outer ring pipe 62 respectively.

[0032] A plurality of spiral-shaped pores 64 are formed on the pipe walls of the inner ring pipe 61, the outer ring pipe 62, and the connecting straight pipes 63.

[0033] The inlet pipe 65 penetrates and is fixed in the chlorine inlet port 3 in the horizontal direction. The inner end of the inlet pipe 65 is connected to the inner ring pipe 61, and the inner cavities are connected and communicated; the outer end of the inlet pipe 65 is connected to the chlorine delivery pipe 8 through a tee 7.

[0034] The chlorine delivery pipe 8 is installed outside the tower body 1 in the vertical direction. The chlorine delivery pipe 8 distributes chlorine to each gas distribution plate 6 through each tee 7.

[0035] Spiral blades 9 are respectively provided above the gas distribution plates 6, and the spiral blades 9 are arranged in one-to-one correspondence with the gas distribution plates 6.

[0036] The spiral blade 9 is installed on the main shaft 10, and the main shaft 10 penetrates the inner ring pipe 61 of the gas distribution plate 6 in the vertical direction.

[0037] The top end of the main shaft 10 is connected to the motor 12 at the top of the tower body 1 through a coupling 11. The motor 12 drives the spiral blade 9 to rotate through the main shaft 10, which plays a certain role in stirring and mixing the molten phthalic anhydride.

[0038] The specific working principle of the present utility model:

[0039] The molten phthalic anhydride is pumped into the inner cavity of the tower body 1 from the phthalic anhydride inlet port 2 and flows upward from bottom to top. At the same time, chlorine gas enters the inner cavity of the tower body 1 through the chlorine gas delivery pipe 8, the three-way joint 7, and the gas distribution plate 6. By setting a plurality of gas distribution plates 6, the air flow can be shunted. The gas distribution plate 6 distributes the chlorine gas evenly through a number of spiral-shaped pores 64 on the pipe wall for bubbling to ensure the success rate of bubbling. The bubbles react with the phthalic anhydride during the upward movement to generate a monosubstituted reaction. The reaction product, monochlorophthalic anhydride, is output from the discharge port 4, and the tail gas such as hydrogen chloride generated by the reaction is discharged from the tail gas outlet port 5.

[0040] By respectively arranging rotatable spiral blades 9 above the gas distribution plate 6, it plays a certain role in stirring and mixing, enabling the chlorine gas and the molten phthalic anhydride to be fully mixed and evenly contacted to achieve an efficient reaction.

[0041] The above is an example of the best implementation mode of the present utility model. The parts not described in detail are all common general knowledge of those skilled in the art. The protection scope of the present utility model is subject to the content of the claims. Any equivalent transformation based on the technical inspiration of the present utility model is also within the protection scope of the present utility model.

Claims

1. An efficient bubble column for the synthesis of monochlorophthalic anhydride, characterized in that: It includes a tower body (1), and there are a plurality of chlorine gas inlet ports (3) equidistantly arranged in the vertical direction on the side wall of the tower body (1); A plurality of gas distribution plates (6) are installed in the inner cavity of the tower body (1). The gas distribution plate (6) is composed of an inner ring pipe (61), an outer ring pipe (62), connecting straight pipes (63), and an inlet pipe (65). A plurality of spiral-shaped pores (64) are formed on the pipe walls of the inner ring pipe (61), the outer ring pipe (62), and the connecting straight pipes (63). The inlet pipe (65) is horizontally penetrated and fixed in the chlorine gas inlet port (3), and the outer end of the inlet pipe (65) is connected to the chlorine gas delivery pipe (8) through a tee (7); Spiral blades (9) are respectively arranged above the gas distribution plates (6). The spiral blades (9) are installed on the main shaft (10), and the main shaft (10) vertically penetrates the inner ring pipe (61) of the gas distribution plate (6).

2. The high-efficiency bubble column for synthesizing monochlorophthalic anhydride according to claim 1, characterized in that: The outer ring pipe (62) is sleeved outside the inner ring pipe (61), and the inner ring pipe (61) and the outer ring pipe (62) are in the same plane.

3. The high-efficiency bubble column for synthesizing monochlorophthalic anhydride according to claim 2, characterized in that: The inner ring pipe (61) and the outer ring pipe (62) are connected by a plurality of connecting straight pipes (63) distributed in a circular pattern. The two ends of the connecting straight pipe (63) are respectively fixedly connected to the inner ring pipe (61) and the outer ring pipe (62).

4. The high-efficiency bubble column for synthesizing monochlorophthalic anhydride according to claim 3, wherein: The inner end of the inlet pipe (65) is connected to the inner ring pipe (61), and the inner cavities are connected and communicated.

5. The high-efficiency bubble column for synthesizing monochlorophthalic anhydride according to claim 1, characterized in that: The bottom end of the tower body (1) is provided with a phthalic anhydride inlet port (2).

6. The high-efficiency bubble column for synthesizing monochlorophthalic anhydride according to claim 1, wherein: On both sides of the top of the tower body (1), there are a discharge port (4) and a tail gas outlet port (5). The height of the tail gas outlet port (5) is greater than the height of the discharge port (4).

7. The high-efficiency bubble column for synthesizing monochlorophthalic anhydride according to claim 1, characterized in that: The chlorine gas delivery pipe (8) is installed vertically outside the tower body (1).

8. The high-efficiency bubble column for synthesizing monochlorophthalic anhydride according to claim 1, wherein: The top end of the main shaft (10) is connected to the motor (12) at the top of the tower body (1) through a coupling (11).

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