Continuous gas phase cooling device for chlorination reaction

Abstract

The utility model discloses a continuous gas phase cooling device for chlorination reaction, and belongs to the technical field of fine chemical engineering. A continuous gas phase cooling device for chlorination reaction comprises a first-stage cooling tower and a second-stage cooling tower, the first-stage cooling tower comprises a first gas phase cooling impurity capturing tower, a lower impurity capturing tower and a gas-liquid separation tower which are arranged from top to bottom, and the second-stage cooling tower comprises a second gas phase cooling impurity capturing tower. A second gas phase inlet is formed in the side edge of the second gas phase cooling impurity capturing tower; after a gas-phase material is cooled and purified by the first-stage cooling tower, impurities in backflow liquid can be reduced, subsequent continuous reaction is facilitated, the loss amount of the material is reduced, most impurities in the gas phase are cooled and captured after the gas phase is subjected to double cooling by the first-stage cooling tower and the second-stage cooling tower, and the gas phase quality is improved. And meanwhile, the tower sections are sealed by using the sealing gaskets and the bolts, so that gas leakage can be prevented, and the working environment is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fine chemical industry, in particular to a continuous gas-phase cooling device for chlorination reaction. Background Art

[0002] Chlorine is one of the most important chemical substances in the chlorination process. It is yellow-green at normal temperature and pressure, a highly toxic gas with a strong pungent odor. It is denser than air and has asphyxiating properties. Chlorine mainly acts on the trachea, bronchi, bronchioles and alveoli, resulting in corresponding lesions. When the chlorine concentration in the air reaches 10 mg / m 3 At this time, a strong irritating effect will occur, and poisoned personnel will show mucosal irritation, such as eye tearing, conjunctival congestion, stinging pain, a burning sensation in the nasopharynx and coughing.

[0003] Chlorination reactions usually involve high temperatures, and the reaction system is filled with one or more extremely harmful materials such as chlorine. In fine chemical industry, most of the kettle chlorination reactions are mainly carried out in a kettle reaction mode, where chlorine is introduced into the reaction kettle and heated simultaneously. Therefore, a closed continuous gas-phase cooling device is required.

[0004] Existing gas-phase cooling devices have problems such as poor cooling effect, low pressure-bearing coefficient, and large leakage of chlorine gas after the condenser is damaged. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the problems raised in the above background art, and to propose a continuous gas-phase cooling device for chlorination reaction.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A continuous gas-phase cooling device for chlorination reaction, including a primary cooling tower and a secondary cooling tower. The primary cooling tower includes a first gas-phase cooling and impurity-removing tower, a lower impurity-removing tower, and a gas-liquid separation tower arranged from top to bottom. Among them, the first gas-phase cooling and impurity-removing tower is connected to the lower impurity-removing tower through a pipeline. The secondary cooling tower includes a second gas-phase cooling and impurity-removing tower. A second gas-phase inlet is arranged on the side of the second gas-phase cooling and impurity-removing tower. The upper end of the first gas-phase cooling and impurity-removing tower is communicated with the second gas-phase inlet through a pipeline. Among them, cooling coils are arranged in both the first gas-phase cooling and impurity-removing tower and the second gas-phase cooling and impurity-removing tower.

[0008] Preferably, trapping and impurity-removing fillers are arranged in the first gas-phase cooling and impurity-removing tower, the lower impurity-removing tower, and the second gas-phase cooling and impurity-removing tower.

[0009] Preferably, the first gas-phase cooling and impurity-removing tower is connected to the lower impurity-removing tower through a flange.

[0010] Preferably, a tray is arranged between the two flanges.

[0011] Preferably, a first gas-phase inlet is provided on the side of the lower impurity-trapping tower.

[0012] Preferably, a first spraying port is provided on the first gas-phase cooling and impurity-trapping tower, and a second spraying port is provided at the upper end of the second gas-phase cooling and impurity-trapping tower.

[0013] Preferably, a first viewing window is provided on the first gas-phase cooling and impurity-trapping tower;

[0014] a second viewing window is provided on the lower impurity-trapping tower;

[0015] a third viewing window is provided on the gas-liquid separation tower;

[0016] a fourth viewing window is provided on the second gas-phase cooling and impurity-trapping tower.

[0017] Compared with the prior art, the present utility model provides a continuous gas-phase cooling device for chlorination reaction, which has the following beneficial effects:

[0018] For the parts not involved in this device, they are the same as or can be implemented by the prior art. After the gas-phase material in the present utility model is cooled and purified by the primary cooling tower, the impurities in the reflux liquid can be reduced, which not only facilitates the subsequent continuous reaction, but also greatly reduces the loss of materials. After the gas-phase is double-cooled by the primary cooling tower and the secondary cooling tower, most of the impurities in the gas-phase are cooled and trapped, and only a small amount of waste gas remains inside for recovery. At the same time, gaskets and bolts are used for sealing between the tower sections, which can prevent gas leakage and improve the working environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 FIG. is a schematic structural diagram of a continuous gas-phase cooling device for chlorination reaction proposed by the present utility model;

[0020] Figure 2 FIG. is a schematic cross-sectional structural diagram of a continuous gas-phase cooling device for chlorination reaction proposed by the present utility model.

[0021] In the figure: 1, the first gas-phase cooling and impurity-trapping tower; 101, the first viewing window; 102, the first spraying port; 2, the lower impurity-trapping tower; 201, the second viewing window; 202, the first gas-phase inlet; 3, the gas-liquid separation tower; 301, the third viewing window; 4, the second gas-phase cooling and impurity-trapping tower; 401, the fourth viewing window; 402, the second spraying port; 403, the second gas-phase inlet; 5, the flange; 6, the trapping and impurity-removing packing; 7, the cooling coil. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0023] Example 1:

[0024] Referring to Figure 1-2 , a continuous gas-phase cooling device for chlorination reaction, comprising a primary cooling tower and a secondary cooling tower. The primary cooling tower includes a first gas-phase cooling and impurity-trapping tower 1, a lower impurity-trapping tower 2, and a gas-liquid separation tower 3 arranged from top to bottom. Among them, the first gas-phase cooling and impurity-trapping tower 1 is connected to the lower impurity-trapping tower 2 through a pipeline. The secondary cooling tower includes a second gas-phase cooling and impurity-trapping tower 4. A second gas-phase inlet 403 is provided on the side of the second gas-phase cooling and impurity-trapping tower 4. The upper end of the first gas-phase cooling and impurity-trapping tower 1 is communicated with the second gas-phase inlet 403 through a pipeline. Among them, cooling coils 7 are provided in both the first gas-phase cooling and impurity-trapping tower 1 and the second gas-phase cooling and impurity-trapping tower 4.

[0025] Trapping and impurity-removing fillers 6 are provided in the first gas-phase cooling and impurity-trapping tower 1, the lower impurity-trapping tower 2, and the second gas-phase cooling and impurity-trapping tower 4.

[0026] The first gas-phase cooling and impurity-trapping tower 1 is connected to the lower impurity-trapping tower 2 through a flange 5.

[0027] A tray is provided between the two flanges 5. The flanges 5 are connected by bolts. The opening ratio of the tray is at least 98%, so as to prevent the phenomenon of tower overturning caused by too high pressure of gaseous materials, ensure the continuous reaction time, and avoid the leakage of gaseous materials.

[0028] A first gas-phase inlet 202 is provided on the side of the lower impurity-trapping tower 2.

[0029] A first spray port 102 is provided on the first gas-phase cooling and impurity-trapping tower 1, and a second spray port 402 is provided at the upper end of the second gas-phase cooling and impurity-trapping tower 4.

[0030] A first viewing window 101 is provided on the first gas-phase cooling and impurity-trapping tower 1; a second viewing window 201 is provided on the lower impurity-trapping tower 2; a third viewing window 301 is provided on the gas-liquid separation tower 3; a fourth viewing window 401 is provided on the second gas-phase cooling and impurity-trapping tower 4. Through the multiple groups of viewing windows provided, it is convenient to observe the state of the chlorination reaction.

[0031] During use, the gas phase generated by the chlorination reaction is initially cooled in the primary cooling tower, enters the lower impurity-trapping tower 2 through the first gas-phase inlet 202. After being trapped by the trapping and impurity-removing fillers 6 in the lower impurity-trapping tower 2 and the first gas-phase cooling and impurity-trapping tower 1, the gas phase is cooled at the cooling coils 7 of the first gas-phase cooling and impurity-trapping tower 1 and is converted into a liquid phase. At this time, the liquid-phase material falls, and after passing through the trapping and impurity-removing fillers 6, it enters the gas-liquid separation tower 3 through a pipeline to form a liquid-phase material reflux;

[0032] The material that remains in the gaseous phase after being cooled by the cooling coil 7 enters the second gas-phase cooling and impurity-removing tower 4 through a pipeline. This part of the gas phase enters the trapping and impurity-removing packing 6 and the cooling coil 7 inside the second gas-phase cooling and impurity-removing tower 4 for further cooling. After cooling, the gas phase moves upward and the liquid phase moves downward. The gas phase enters the tail gas absorption system through the upper end, and the liquid phase is refluxed after being trapped and impurity-removed.

[0033] In the present utility model, after the gas-phase material is cooled and impurity-removed by the primary cooling tower, the impurities in the reflux liquid can be reduced, which not only facilitates the subsequent continuous reaction but also greatly reduces the loss of the material. Moreover, after the gas phase is double-cooled by the primary cooling tower and the secondary cooling tower, most of the impurities in the gas phase are cooled and trapped, and only a small amount of waste gas remains inside for recovery. At the same time, gaskets and bolts are used for sealing between tower sections, which can prevent gas leakage and improve the working environment.

[0034] The above is only a preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.

Claims

1. A continuous gas-phase cooling device for chlorination reaction, characterized in that, It includes a primary cooling tower and a secondary cooling tower. The primary cooling tower includes a first gas-phase cooling and impurity-removing tower (1), a lower impurity-removing tower (2), and a gas-liquid separation tower (3) arranged from top to bottom. Among them, the first gas-phase cooling and impurity-removing tower (1) is connected to the lower impurity-removing tower (2) through a pipeline. The secondary cooling tower includes a second gas-phase cooling and impurity-removing tower (4). A second gas-phase inlet (403) is provided on the side of the second gas-phase cooling and impurity-removing tower (4). The upper end of the first gas-phase cooling and impurity-removing tower (1) is communicated with the second gas-phase inlet (403) through a pipeline. Among them, cooling coils (7) are provided in both the first gas-phase cooling and impurity-removing tower (1) and the second gas-phase cooling and impurity-removing tower (4).

2. The continuous gas-phase cooling device for chlorination reaction according to claim 1, characterized in that, Collection and impurity-removing fillers (6) are provided in the first gas-phase cooling and impurity-removing tower (1), the lower impurity-removing tower (2), and the second gas-phase cooling and impurity-removing tower (4).

3. The continuous gas-phase cooling device for chlorination reaction according to claim 1, characterized in that, The first gas-phase cooling and impurity-removing tower (1) is connected to the lower impurity-removing tower (2) through a flange (5).

4. The continuous gas-phase cooling device for chlorination reaction according to claim 3, characterized in that, A tray is provided between the two flanges (5).

5. The continuous gas-phase cooling device for chlorination reaction according to claim 1, characterized in that, A first gas-phase inlet (202) is provided on the side of the lower impurity-removing tower (2).

6. The continuous gas-phase cooling device for chlorination reaction according to claim 5, wherein, A first spray port (102) is provided on the first gas-phase cooling and impurity-removing tower (1), and a second spray port (402) is provided at the upper end of the second gas-phase cooling and impurity-removing tower (4).

7. The continuous gas-phase cooling device for chlorination reaction according to claim 1, wherein A first viewing window (101) is provided on the first gas-phase cooling and impurity-removing tower (1); A second viewing window (201) is provided on the lower impurity-removing tower (2); A third viewing window (301) is provided on the gas-liquid separation tower (3); A fourth viewing window (401) is provided on the second gas-phase cooling and impurity-removing tower (4).

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