Accurate temperature control bubble tower for synthesizing monochlorophthalic anhydride

Abstract

The utility model discloses an accurate temperature control bubble tower for synthesizing monochlorophthalic anhydride, which comprises a tower body with a vertical structure, a plurality of temperature control components A are fixedly arranged on the inner wall of the tower body along the vertical direction, and a temperature control component B is arranged in the middle of the inner cavity of the tower body; the temperature control assembly A comprises an inner ring plate and an outer ring plate which are coaxially arranged, a plurality of rib plates are fixedly installed between the inner ring plate and the outer ring plate, heat exchange medium flow channels are formed between the rib plates and the inner ring plate and between the rib plates and the outer ring plate, the heat exchange medium flow channels are arranged in the vertical direction, and the bottom end of the inner ring plate and the bottom end of the outer ring plate are connected with flow dividing ring plates. The top ends of the inner ring plate and the outer ring plate are connected with a confluence ring plate; and the temperature control assembly B comprises two spiral pipes which are wound with each other. According to the bubble tower provided by the utility model, through the matching of two heat exchange modes from outside to inside and from inside to outside, the temperature in the monosubstitution reaction process is ensured to be uniform and stable, so that a high-quality product is obtained.

Description

Technical Field

[0001] The utility model relates to a precise temperature control bubble column for synthesizing monochlorophthalic anhydride, and belongs to the technical field of synthesizing monochlorophthalic anhydride. Background Art

[0002] The bubble column is a commonly used gas-liquid contact reaction device. The synthesis of monochlorophthalic anhydride requires the use of a bubble column. The bubble column is filled with molten phthalic anhydride flowing from bottom to top. Chlorine gas is introduced horizontally from the side inlet of the tower and dispersed into bubbles rising along the molten phthalic anhydride, and undergoes a monosubstitution reaction with phthalic anhydride to generate the product monochlorophthalic anhydride.

[0003] In the prior art, for the bubble column used in the synthesis of monochlorophthalic anhydride, the temperature of the materials in the tower is generally controlled by a heat exchange jacket outside the tower body. Due to the relatively thick tower body wall, the time for heat transfer becomes longer, resulting in relatively low heat transfer efficiency. The heat exchange jacket transfers heat from the outside to the inside to the materials in the tower, and there is a significant difference in the reaction temperature between the materials at the inner wall of the tower and the materials at the center position of the tower. The reaction temperature of the materials is uneven, affecting the quality of the product.

[0004] In summary, it is obvious that the prior art has inconveniences and defects in actual use, so it is necessary to be improved. Content of the Utility Model

[0005] Aiming at the deficiencies in the background art, the utility model provides a precise temperature control bubble column for synthesizing monochlorophthalic anhydride. Through the cooperation of two heat exchange methods from outside to inside and from inside to outside, the temperature during the monosubstitution reaction is ensured to be uniform and stable, so as to obtain high-quality products.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] The precise temperature control bubble column for synthesizing monochlorophthalic anhydride includes a tower body with a vertical structure. A plurality of temperature control components A are fixedly installed on the inner wall of the tower body along the vertical direction, and a temperature control component B is installed in the middle of the inner cavity of the tower;

[0008] The temperature control component A includes an inner ring plate and an outer ring plate arranged coaxially. A plurality of rib plates are fixedly installed between the inner ring plate and the outer ring plate. Heat exchange medium flow channels are formed between the rib plates and the inner ring plate and the outer ring plate. The heat exchange medium flow channels are arranged along the vertical direction. The bottom ends of the inner ring plate and the outer ring plate are connected with a shunt ring plate, and the top ends of the inner ring plate and the outer ring plate are connected with a confluence ring plate;

[0009] The temperature control component B includes two spiral tubes wound around each other.

[0010] Further, the rib plates are inclined with respect to the inner ring plate and the outer ring plate.

[0011] Further, the shunt ring plate and the confluence ring plate are both communicated with the heat exchange medium flow channels.

[0012] Further, a heat exchange medium inlet A communicating with its inner cavity is connected to the side of the shunt ring plate, and a heat exchange medium outlet A communicating with its inner cavity is connected to the side of the confluence ring plate.

[0013] Further, a heat exchange medium inlet B is provided at the bottom of one of the spiral tubes, and a heat exchange medium outlet B is provided at its top. A heat exchange medium inlet C is provided at the top of the other spiral tube, and a heat exchange medium outlet C is provided at its bottom.

[0014] Further, the heat exchange medium inlet B, the heat exchange medium outlet B, the heat exchange medium inlet C, and the heat exchange medium outlet C all penetrate the tower wall of the tower body in the horizontal direction.

[0015] Further, a liquid inlet is provided at the bottom end of the tower body.

[0016] Further, an air inlet is provided at the side of the bottom end of the tower body.

[0017] Further, a discharge port is provided at the side of the top end of the tower body.

[0018] Further, an exhaust gas outlet is provided at the top of the tower body.

[0019] After the present utility model adopts the above technical solutions, compared with the prior art, it has the following advantages:

[0020] In the present utility model, a plurality of temperature control components A are fixedly installed on the inner wall of the tower body along the vertical direction. The temperature control components A exchange heat with the molten phthalic anhydride filled in the inner cavity of the tower body from the outside to the inside. A temperature control component B is installed in the middle of the inner cavity of the tower body, and the temperature control component B exchanges heat with the molten phthalic anhydride filled in the inner cavity of the tower body from the inside to the outside;

[0021] Through the cooperation of two heat exchange methods from the outside to the inside and from the inside to the outside, the present utility model ensures that the temperature during the mono-substitution reaction process is uniform and stable, so as to obtain high-quality products.

[0022] The present utility model will be described in detail below with reference to the drawings and embodiments. Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of the present utility model;

[0024] Figure 2 is a schematic structural diagram of the temperature control component A in the present utility model;

[0025] Figure 3 is Figure 2 the cross-sectional schematic diagram at A-A in

[0026] Figure 4It is a schematic structural diagram of the temperature control component B of the present utility model.

[0027] In the figure, 1 - tower body; 2 - liquid inlet; 3 - gas inlet; 4 - discharge port; 5 - waste gas outlet; 6 - temperature control component A, 61 - inner ring plate, 62 - outer ring plate, 63 - rib plate, 64 - heat exchange medium flow channel, 65 - flow splitting ring plate, 66 - flow combining ring plate, 67 - heat exchange medium inlet A, 68 - heat exchange medium outlet A; 7 - temperature control component B, 71 - spiral tube, 72 - heat exchange medium inlet B, 73 - heat exchange medium outlet B, 74 - heat exchange medium inlet C, 75 - heat exchange medium outlet C. Specific embodiments

[0028] For 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.

[0029] As Figures 1 - 4 Collectively shown, the present utility model provides a precisely temperature - controlled bubbling tower for synthesizing monochlorophthalic anhydride, which includes a tower body 1 with a vertical structure. The bottom end of the tower body 1 is provided with a liquid inlet 2, the side of the bottom end of the tower body 1 is provided with a gas inlet 3, the side of the top end of the tower body 1 is provided with a discharge port 4, and the top end of the tower body 1 is provided with a waste gas outlet 5.

[0030] The liquid inlet 2 is used for inputting molten phthalic anhydride, the gas inlet 3 is used for inputting chlorine gas, the discharge port 4 is used for outputting the reaction product monochlorophthalic anhydride, and the waste gas outlet 5 is used for outputting waste gases such as hydrogen chloride.

[0031] A plurality of temperature control components A6 are fixedly installed on the inner wall of the tower body 1 along the vertical direction. The temperature control components A6 exchange heat with the molten phthalic anhydride filled in the inner cavity of the tower body 1 from the outside to the inside. A temperature control component B7 is installed in the middle of the inner cavity of the tower body 1, and the temperature control component B7 exchanges heat with the molten phthalic anhydride filled in the inner cavity of the tower body 1 from the inside to the outside.

[0032] The temperature control component A6 includes an inner ring plate 61 and an outer ring plate 62 arranged coaxially. A plurality of rib plates 63 are fixedly installed between the inner ring plate 61 and the outer ring plate 62. The rib plates 63 are inclined with respect to the inner ring plate 61 and the outer ring plate 62. The rib plates 63 are used to improve the pressure - bearing function of the temperature control component A6. Heat exchange medium flow channels 64 are formed between the rib plates 63 and the inner ring plate 61 and the outer ring plate 62, and the heat exchange medium flow channels 64 are arranged along the vertical direction.

[0033] The bottom ends of the inner ring plate 61 and the outer ring plate 62 are connected with a flow splitting ring plate 65, and the top ends of the inner ring plate 61 and the outer ring plate 62 are connected with a flow combining ring plate 66. Both the flow splitting ring plate 65 and the flow combining ring plate 66 are communicated with the heat exchange medium flow channels 64.

[0034] A heat exchange medium inlet A67 communicating with the inner cavity thereof is connected to the side of the flow splitting ring plate 65, and a heat exchange medium outlet A68 communicating with the inner cavity thereof is connected to the side of the flow combining ring plate 66.

[0035] The heat exchange medium enters the flow splitting ring plate 65 from the heat exchange medium inlet A67 and then splits into each heat exchange medium flow channel 64, exchanges heat with the phthalic anhydride in the inner cavity of the tower body 1, and after heat exchange, is combined by the flow combining ring plate 66 and output from the heat exchange medium outlet A68.

[0036] The temperature control component B7 includes two helical tubes 71 wound around each other. A heat exchange medium inlet B72 is provided at the bottom of one of the helical tubes 71, and a heat exchange medium outlet B73 is provided at the top thereof. A heat exchange medium inlet C74 is provided at the top of the other helical tube 71, and a heat exchange medium outlet C75 is provided at the bottom thereof.

[0037] The heat exchange medium inlet B72, the heat exchange medium outlet B73, the heat exchange medium inlet C74, and the heat exchange medium outlet C75 all penetrate the tower wall of the tower body 1 along the horizontal direction.

[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 liquid inlet 2 and flows upward. At the same time, chlorine gas enters the inner cavity of the tower body 1 from the gas inlet 3 and bubbles. The bubbles undergo a single substitution reaction with the phthalic anhydride during the rising process. 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 waste gas outlet 5.

[0040] The heat exchange medium enters the temperature control component A6, enters the flow splitting ring plate 65 from the heat exchange medium inlet A67 and then splits into each heat exchange medium flow channel 64, exchanges heat with the phthalic anhydride in the inner cavity of the tower body 1, and after heat exchange, is combined by the flow combining ring plate 66 and output from the heat exchange medium outlet A68.

[0041] The heat exchange medium enters the temperature control component B7, enters the two helical tubes 71 from the heat exchange medium inlet B72 and the heat exchange medium inlet C74 respectively, exchanges heat with the phthalic anhydride in the inner cavity of the tower body 1, and after heat exchange, is output from the heat exchange medium outlet B73 and the heat exchange medium outlet C75.

[0042] 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 shall be subject to the content of the claims, and 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. Precision temperature-controlled bubble column for synthesizing monochlorophthalic anhydride, characterized in that: It includes a tower body (1) with a vertical structure. A plurality of temperature control components A (6) are fixedly installed on the inner wall of the tower body (1) along the vertical direction, and a temperature control component B (7) is installed in the middle of the inner cavity of the tower body (1); The temperature control component A (6) includes a coaxial inner ring plate (61) and outer ring plate (62). A plurality of rib plates (63) are fixedly installed between the inner ring plate (61) and the outer ring plate (62). Heat exchange medium flow channels (64) are formed between the rib plates (63) and the inner ring plate (61) and the outer ring plate (62). The heat exchange medium flow channels (64) are arranged along the vertical direction. The bottom ends of the inner ring plate (61) and the outer ring plate (62) are connected with a flow splitting ring plate (65), and the top ends of the inner ring plate (61) and the outer ring plate (62) are connected with a flow combining ring plate (66); The temperature control component B (7) includes two mutually wound spiral tubes (71).

2. The precise temperature-controlled bubble column for synthesizing monochlorophthalic anhydride according to claim 1, wherein: The rib plates (63) are inclined with respect to the inner ring plate (61) and the outer ring plate (62).

3. The precise temperature-controlled bubble column for synthesizing monochlorophthalic anhydride according to claim 1, wherein: The flow splitting ring plate (65) and the flow combining ring plate (66) are both communicated with the heat exchange medium flow channels (64).

4. The precise temperature-controlled bubble column for synthesizing monochlorophthalic anhydride according to claim 3, wherein: A heat exchange medium inlet A (67) communicated with its inner cavity is connected to the side of the flow splitting ring plate (65), and a heat exchange medium outlet A (68) communicated with its inner cavity is connected to the side of the flow combining ring plate (66).

5. The precise temperature-controlled bubble column for synthesizing monochlorophthalic anhydride according to claim 1, characterized in that: A heat exchange medium inlet B (72) is provided at the bottom of one of the spiral tubes (71), and a heat exchange medium outlet B (73) is provided at its top. A heat exchange medium inlet C (74) is provided at the top of the other spiral tube (71), and a heat exchange medium outlet C (75) is provided at its bottom.

6. The precise temperature-controlled bubble column for synthesizing monochlorophthalic anhydride according to claim 5, characterized in that: The heat exchange medium inlet B (72), the heat exchange medium outlet B (73), the heat exchange medium inlet C (74), and the heat exchange medium outlet C (75) all penetrate through the tower wall of the tower body (1) along the horizontal direction.

7. The precise temperature-controlled bubble column for synthesizing monochlorophthalic anhydride according to claim 1, characterized in that: A liquid inlet (2) is provided at the bottom end of the tower body (1).

8. The precise temperature-controlled bubble column for synthesizing monochlorophthalic anhydride according to claim 7, characterized in that: An air inlet (3) is provided at the side of the bottom end of the tower body (1).

9. The precise temperature-controlled bubble column for synthesizing monochlorophthalic anhydride according to claim 8, wherein: A discharge port (4) is provided at the side of the top end of the tower body (1).

10. The precise temperature-controlled bubble column for synthesizing monochlorophthalic anhydride according to claim 9, wherein: An exhaust gas outlet (5) is provided at the top end of the tower body (1).

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