Air inlet system for synthesizing monochlorophthalic anhydride

Abstract

The utility model discloses a gas inlet system for monochlorophthalic anhydride synthesis, which comprises a bubble tower, a plurality of horizontally arranged gas inlets are arranged on the side wall of the bubble tower, a tee joint is arranged outside each gas inlet, the upper part of each tee joint is communicated with a chlorine gas inlet pipe, and one end of each tee joint far away from the corresponding gas inlet is connected with a plug. A plunger rod reciprocating in the horizontal direction is arranged in the plug in a penetrating mode, a push plate is installed at the inner end of the plunger rod, a connecting plate is installed at the outer end of the plunger rod, an installation cavity of an annular structure is formed between the plug and the plunger rod, packing is installed in the cavity, and a telescopic cylinder and a sliding rod which are parallel to the plunger rod are installed on the side portion of the plunger rod. The tail of a cylinder body of the telescopic cylinder is fixedly connected with the plug, the head of the telescopic cylinder is fixedly connected with the connecting plate, one end of the sliding rod is fixedly connected with the plug, and the other end of the sliding rod penetrates into the connecting plate in a sliding mode. According to the air inlet system provided by the utility model, the problem that the horizontal air inlet on the side of the bubble tower is easily blocked after being cooled by phthalic anhydride can be solved, and smooth air inlet is ensured.

Description

Technical Field

[0001] The utility model relates to an air inlet system for synthesizing monochlorophthalic anhydride, belonging to the technical field of monochlorophthalic anhydride synthesis equipment. Background Art

[0002] The bubble column is a commonly used gas-liquid contact reaction device. The advantage of the bubble column is that the gas phase is highly dispersed in the liquid phase. Therefore, it has a large liquid holdup and an interfacial contact surface, making the mass transfer and heat transfer efficient. 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. Chlorine gas is introduced into the column through a horizontal air inlet on the side of the column, dispersed into bubbles and rises along the molten phthalic anhydride, reacting with the liquid-phase phthalic anhydride while agitating the liquid to increase the mass transfer rate.

[0004] In the prior art, the horizontal air inlet on the side of the bubble column is prone to block the air inlet due to poor heat insulation and the cooling of molten phthalic anhydride, which not only affects the smooth progress of air intake, but also makes the process of unblocking very troublesome.

[0005] In summary, the prior art obviously has inconveniences and defects in actual use, so it is necessary to improve it. Content of the Utility Model

[0006] Aiming at the deficiencies in the background art, the utility model provides an air inlet system for synthesizing monochlorophthalic anhydride, which can solve the problem that the horizontal air inlet on the side of the bubble column is easily blocked by the cooling of phthalic anhydride and ensure the smooth progress of air intake.

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

[0008] The air inlet system for synthesizing monochlorophthalic anhydride includes a bubble column. There are multiple horizontally arranged air inlets on the side wall of the bubble column. A three-way joint is installed outside each air inlet. The upper part of the three-way joint is connected to a chlorine gas inlet pipe; one end of the three-way joint far from the air inlet is connected with a plug through a bolt. A plunger rod that reciprocates horizontally is arranged inside the plug. A push plate is installed at the inner end of the plunger rod, and a connecting plate is installed at the outer end of the plunger rod; an annular installation chamber is arranged between the plug and the plunger rod, and packing for sealing is installed in the chamber; a telescopic cylinder and a slide bar parallel to the plunger rod are installed on the side of the plunger rod.

[0009] Further, a valve is arranged at the connection between the three-way joint and the chlorine gas inlet pipe.

[0010] Further, a gland is arranged at the end of the installation chamber, and a sealing cover is arranged outside the gland. Both the gland and the sealing cover are sleeved on the main body of the plunger rod.

[0011] Furthermore, the sealing cover and the end of the plug are connected by threads.

[0012] Furthermore, the tail of the cylinder body of the telescopic cylinder is fixedly connected to the plug, and the head of the telescopic cylinder is fixedly connected to the connecting plate.

[0013] Furthermore, one end of the sliding rod is fixedly connected to the plug, and the other end of the sliding rod is slidably disposed within the connecting plate.

[0014] Furthermore, a molten phthalic anhydride inlet is provided at the bottom of the bubble column.

[0015] Furthermore, a discharge port is provided on one side of the top of the bubble column.

[0016] Furthermore, a tail gas outlet is provided at the top of the bubble column.

[0017] After the present utility model adopts the above technical solutions, compared with the prior art, it has the following advantages:

[0018] In the present utility model, a plunger rod that reciprocates horizontally is installed outside the air inlet, and the plunger rod is driven by a telescopic cylinder. The telescopic cylinder can drive the plunger rod to reciprocate within the plug. The push plate at the inner end of the plunger rod moves horizontally with the plunger rod, and the push plate cleans the inside of the air inlet during the movement, avoiding the problem of blockage at the air inlet due to the cooling of phthalic anhydride.

[0019] In the present utility model, a packing seal assembly is provided on the main body of the plunger rod to avoid the problem of air-liquid leakage around the plunger rod during its reciprocating horizontal movement.

[0020] The present utility model will be described in detail below with reference to the accompanying drawings and embodiments. Description of the Drawings

[0021] Figure 1 is the installation schematic diagram of the present utility model;

[0022] Figure 2 is the structural cross-sectional view of the present utility model.

[0023] In the figure, 1 - bubble column, 2 - molten phthalic anhydride inlet, 3 - air inlet, 4 - discharge port, 5 - tail gas outlet, 6 - three-way, 7 - chlorine inlet pipe, 8 - valve, 9 - plug, 10 - plunger rod, 11 - push plate, 12 - packing, 13 - gland, 14 - sealing cover, 15 - connecting plate, 16 - telescopic cylinder, 17 - sliding rod. Detailed Embodiments

[0024] 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.

[0025] AsFigure 1 - Figure 2 As shown together, the utility model provides an air inlet system for synthesizing monochlorophthalic anhydride, which includes a bubbling tower 1, and there are a plurality of horizontally arranged air inlets 3 on the side wall of the bubbling tower 1.

[0026] A molten phthalic anhydride inlet 2 is provided at the bottom of the bubbling tower 1, a discharge port 4 is provided on one side of the top of the bubbling tower 1, and a tail gas outlet 5 is provided at the top of the bubbling tower 1.

[0027] The melt pump pumps molten phthalic anhydride into the bottom of the bubbling tower 1, and then it flows upward in the tower. At the same time, chlorine gas is input into the inner cavity of the bubbling tower 1 through the air inlet 3. The chlorine gas undergoes a single substitution reaction with phthalic anhydride. The reaction product is output from the discharge port 4, and the reaction tail gas is output from the tail gas outlet 5.

[0028] Three-way joints 6 are installed outside the air inlets 3. The upper part of the three-way joint 6 is connected to a chlorine gas inlet pipe 7, and a valve 8 is provided at the connection between the three-way joint 6 and the chlorine gas inlet pipe 7.

[0029] One end of the three-way joint 6 away from the air inlet 3 is connected with a plug 9 by bolts. A plunger rod 10 that reciprocates horizontally is arranged inside the plug 9. A push plate 11 is installed at the inner end of the plunger rod 10, and a connecting plate 15 is installed at the outer end of the plunger rod 10.

[0030] An annular installation chamber is provided between the plug 9 and the plunger rod 10, and a packing 12 for sealing is installed in the chamber.

[0031] A gland 13 is provided at the end of the installation chamber. A sealing cover 14 is provided outside the gland 13. Both the gland 13 and the sealing cover 14 are sleeved on the main body of the plunger rod 10, and the sealing cover 14 is threadedly connected to the end of the plug 9. During the screwing process of the sealing cover 14, the packing 12 is pressed tightly by the gland 13 to avoid the problem of air-liquid leakage around the plunger rod 10 during the reciprocating horizontal movement of the plunger rod 10.

[0032] A telescopic cylinder 16 and a sliding rod 17 that are parallel to it are installed on the side of the plunger rod 10.

[0033] The cylinder body tail of the telescopic cylinder 16 is fixedly connected to the plug 9, and the head of the telescopic cylinder 16 is fixedly connected to the connecting plate 15.

[0034] One end of the sliding rod 17 is fixedly connected to the plug 9, and the other end of the sliding rod 17 is slidably inserted into the connecting plate 15. During the telescopic process of the telescopic cylinder 16, the connecting plate 15 and the plunger rod 10 are driven to move smoothly along the sliding rod 17.

[0035] The specific working principle of the utility model:

[0036] Chlorine gas enters the inner cavity of the bubbling tower 1 through the chlorine gas inlet pipe 7, valve 8, three-way joint 6, and air inlet 3 in sequence and undergoes a single substitution reaction with molten phthalic anhydride.

[0037] In the present utility model, a plunger rod 10 that reciprocates horizontally is installed outside the air inlet 3. The plunger rod 10 is driven by a telescopic cylinder 16. The telescopic cylinder 16 can drive the plunger rod 10 to reciprocate inside the plug 9. The push plate 11 at the inner end of the plunger rod 10 moves horizontally along with the plunger rod 10. During the movement, the push plate 11 cleans the inside of the air inlet 3, avoiding the problem of blockage at the air inlet 3 due to the cooling of phthalic anhydride.

[0038] In the present utility model, a packing seal assembly is provided on the main body of the plunger rod 10, avoiding the problem of gas-liquid leakage around the plunger rod 10 during its reciprocating horizontal movement.

[0039] 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 of ordinary skill 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. Inlet gas system for synthesizing monochlorophthalic anhydride, characterized in that: It includes a bubble column (1). There are multiple horizontally arranged air inlets (3) on the side wall of the bubble column (1). Three-way joints (6) are installed outside each of the air inlets (3). The upper part of the three-way joint (6) is connected to a chlorine inlet pipe (7). One end of the three-way joint (6) far from the air inlet (3) is connected with a plug (9) by bolts. A plunger rod (10) that reciprocates horizontally is inserted into the plug (9). A push plate (11) is installed at the inner end of the plunger rod (10), and a connecting plate (15) is installed at the outer end of the plunger rod (10). An annular installation chamber is provided between the plug (9) and the plunger rod (10), and a packing (12) for sealing is installed in the chamber. A telescopic cylinder (16) and a sliding rod (17) that are parallel to each other are installed on the side of the plunger rod (10).

2. The intake system for synthesizing monochlorophthalic anhydride according to claim 1, wherein: A valve (8) is provided at the connection between the three-way joint (6) and the chlorine inlet pipe (7).

3. The intake system for synthesizing monochlorophthalic anhydride according to claim 1, characterized in that: A gland (13) is provided at the end of the installation chamber. A sealing cover (14) is provided outside the gland (13). Both the gland (13) and the sealing cover (14) are sleeved on the main body of the plunger rod (10).

4. The intake air system for synthesizing monochlorophthalic anhydride according to claim 3, wherein: The sealing cover (14) is threadedly connected to the end of the plug (9).

5. The intake air system for synthesizing monochlorophthalic anhydride according to claim 1, wherein: The tail of the cylinder body of the telescopic cylinder (16) is fixedly connected to the plug (9), and the head of the telescopic cylinder (16) is fixedly connected to the connecting plate (15).

6. The intake air system for synthesizing monochlorophthalic anhydride according to claim 5, characterized in that: One end of the sliding rod (17) is fixedly connected to the plug (9), and the other end of the sliding rod (17) is slidably inserted into the connecting plate (15).

7. The intake system for synthesizing monochlorophthalic anhydride according to claim 1, characterized in that: A molten phthalic anhydride inlet (2) is provided at the bottom of the bubble column (1).

8. The intake air system for synthesizing monochlorophthalic anhydride according to claim 7, wherein: An outlet (4) is provided on one side of the top of the bubble column (1).

9. The intake air system for synthesizing monochlorophthalic anhydride according to claim 8, characterized in that: An exhaust gas outlet (5) is provided at the top of the bubble column (1).

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