Chlorinator for producing chlorobenzene

Abstract

This utility model discloses a chlorinator for chlorobenzene production, belonging to the field of chlorobenzene production technology. It includes a first cylinder and a second cylinder arranged sequentially from bottom to top. The first cylinder has a skirt at its bottom, which is bolted to the ground. The lower part of the second cylinder is conical, and its lower end is bolted to the first cylinder via a flange. The top of the second cylinder has a sealing head, which is bolted to the second cylinder via a flange. The diameter of the second cylinder is larger than that of the first cylinder. This utility model increases the diameter of the second cylinder from its connection point with the first cylinder upwards, enlarging the top space of the chlorinator and allowing it to fully utilize its gas-liquid separation function. This allows hydrogen chloride gas and benzene vapor to separate from the crude chlorination liquid, reducing the benzene content in the hydrogen chloride gas, decreasing benzene consumption, and simultaneously enhancing the purification effect of the crude chlorination liquid, thereby increasing product yield.

Description

Technical Field

[0001] This utility model belongs to the field of chlorobenzene production technology, and more specifically relates to a chlorinator for chlorobenzene production. Background Technology

[0002] Chlorobenzene is an important organic intermediate widely used in dyes, pharmaceuticals, rubber, and pesticides. Its production process involves the reaction of benzene and chlorine gas under ferric chloride catalysis, releasing heat. After neutralization, washing with water, and distillation, chlorobenzene is obtained. This reaction is a "homogeneous catalytic chlorination," meaning a single-liquid-phase reaction. The hydrogen chloride gas generated in the chlorinator, along with its vapor, is discharged through a riser at the top of the chlorinator. During this discharge, the reacted chlorinated liquid is carried out, resulting in very low gas-liquid separation efficiency, increased benzene consumption, and a significant reduction in product yield. Therefore, providing a highly efficient and high-yield chlorinator for chlorobenzene production is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0003] In view of this, the present invention provides a chlorinator for the production of chlorobenzene, which has the advantages of high efficiency and high output.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A chlorinator for producing chlorobenzene includes a first cylinder and a second cylinder arranged sequentially from bottom to top; the first cylinder has a skirt at its bottom, which is fixed to the ground by bolts; the lower part of the second cylinder is conical, and its lower end is bolted to the first cylinder through a flange; the top of the second cylinder has a sealing head, which is bolted to the second cylinder through a flange; the diameter of the second cylinder is larger than the diameter of the first cylinder.

[0006] Furthermore, a benzene inlet and a chlorine inlet are sequentially provided on one side of the lower section of the first cylinder from bottom to top for introducing benzene and chlorine gas; a packing cavity is provided inside the middle section of the first cylinder for storing packing; a support plate is provided at the bottom of the middle section of the packing cavity for supporting the packing; and a chlorine liquid outlet is provided on the top side wall of the first cylinder.

[0007] Furthermore, a packing outlet is provided on the bottom side wall of the packing cavity above the support plate; and a packing inlet is provided on the top side wall of the packing cavity.

[0008] Furthermore, a thermometer placement hole one is provided on the side wall of the middle part of the packing cavity, and a thermometer placement hole two is provided on the side wall of the packing cavity above the packing inlet.

[0009] Furthermore, an acid discharge port is provided on the bottom side of the first cylinder for discharging waste acid water.

[0010] Furthermore, a hydrogen chloride outlet is provided at the top of the second cylinder for discharging hydrogen chloride gas and benzene vapor; a pressure balance port is provided on the middle side wall of the second cylinder.

[0011] The beneficial effects of this utility model are as follows:

[0012] This utility model provides a chlorinator for the production of chlorobenzene. By increasing the diameter of the second cylinder from the connection point with the first cylinder upwards, the top space of the chlorinator is enlarged, allowing it to fully perform its gas-liquid separation function. This allows hydrogen chloride gas and benzene vapor to separate from the crude chlorination liquid, reducing the benzene content in the hydrogen chloride gas and reducing benzene consumption. At the same time, it can also enhance the purification effect of the crude chlorination liquid and increase product yield. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] In the figure:

[0016] 1-Acid discharge port; 2-Benzene inlet; 3-Chlorine inlet; 4-Packaging outlet; 5-Reflux port; 6-Support plate; 7-Thermometer placement hole one; 8-Packaging inlet; 9-Thermometer placement hole two; 10-Chlorine liquid outlet; 11-Gas pressure balance port; 12-Hydrogen chloride outlet; 13-Packaging cavity; 14-End cap; 15-Skirt seat; 16-First cylinder; 17-Second cylinder. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see the appendix Figure 1This utility model provides a chlorinator for the production of chlorobenzene, configured as a reaction tower, comprising a first cylindrical body 16 and a second cylindrical body 17 arranged sequentially from bottom to top; the first cylindrical body 16 has a skirt 15 at its bottom, which is fixed to the ground by bolts; the lower part of the second cylindrical body 17 is conical, and its lower end is bolted to the first cylindrical body 16 via a flange; the top of the second cylindrical body 17 has a sealing head 14, which is bolted to the second cylindrical body 17 via a flange. The diameter of the second cylindrical body 17 is larger than the diameter of the first cylindrical body 16, thus increasing the size of the top of the chlorinator.

[0019] The lower section of the first cylinder 16 has a benzene inlet 2 and a chlorine inlet 3 arranged sequentially from bottom to top on one side for introducing dehydrated and dried benzene and chlorine into the chlorinator. The other side of the lower section of the first cylinder 16 has a reflux port 5 for recovering the liquid benzene that has been separated by the acid-benzene separator after condensation. The remaining benzene vapor and some of the condensed benzene liquid after refining the crude chlorination liquid flow into the benzene recovery tank after condensation in the total condenser, for reuse in the chlorinator.

[0020] The first cylinder 16 has a packing cavity 13 inside its middle section for placing packing material as a catalyst in the reaction. A support plate 6 is located at the bottom of the middle section of the packing cavity 13 to support the packing material. The packing material can be an iron ring. A packing outlet 4 is located on the bottom side wall of the packing cavity 13 above the support plate 6; a packing inlet 8 is located on the top side wall of the packing cavity 13. The packing material is added through the upper packing inlet 8 and manually discharged through the lower packing outlet 4 after the reaction. A thermometer placement hole 7 is located on the middle side wall of the packing cavity 13 for placing a thermometer to monitor temperature changes during the reaction in real time. A second thermometer placement hole 9 is located on the side wall of the packing cavity 13 above the packing inlet 8 for monitoring the temperature at the surface of the chlorinated liquid after the reaction. A chlorinated liquid outlet 10 is located on the top side wall of the first cylinder 16 for discharging crude chlorinated liquid, which is then cooled and enters a crude chlorinated liquid storage tank.

[0021] The bottom side of the first cylinder 16 is provided with an acid discharge port 1 for discharging waste acid water. The waste acid water is periodically discharged into the crude chlorination tank through the acid discharge port 1, and after being washed with water, it is periodically discharged into the waste acid tank for treatment.

[0022] The second cylinder 17 has a hydrogen chloride outlet 12 at its top for discharging hydrogen chloride gas and benzene vapor. A pressure balance port 11 is located on the middle side wall of the second cylinder 17 to balance the internal pressure during gas discharge. The diameter of the second cylinder 17 increases upwards from its connection with the first cylinder 16. By enlarging the top space of the chlorinator, it fully utilizes its gas-liquid separation function, allowing hydrogen chloride gas and benzene vapor to separate from the crude chlorination liquid. This reduces the benzene content in the hydrogen chloride tail gas, decreases benzene consumption, and enhances the purification effect of the crude chlorination liquid, increasing product yield. The benzene vapor and hydrogen chloride gas discharged from the hydrogen chloride outlet 12 at the top of the chlorinator are condensed, and the liquid benzene flows back into the chlorinator. The benzene-free hydrogen chloride gas is then treated to generate a hydrochloric acid solution.

[0023] The reaction in the chlorinator of this invention is as follows:

[0024] 2Fe + 3Cl₂ → 2FeCl₃

[0025]

[0026]

[0027] Dehydrated benzene and chlorine enter the reactor through benzene inlet 2 and chlorine inlet 3. In the presence of a catalyst (ferric chloride – generated by the reaction of iron rings with chlorine), they react in parallel flow at boiling temperature to produce crude chlorinated liquid. After cooling, the liquid enters the crude chlorinated liquid storage tank through chlorinated liquid outlet 10. Hydrogen chloride gas and benzene vapor are discharged from the hydrogen chloride outlet 12 at the top of the chlorinator. The condensed benzene after cooling and benzene removal flows back to the bottom of the chlorinator via an acid-benzene separator. The hydrogen chloride gas is absorbed by spraying to generate hydrochloric acid solution. Waste acid water from the bottom of the chlorinator is periodically discharged into the crude chlorination tank through acid outlet 1. After washing with water, it is periodically discharged into the waste acid tank for treatment.

[0028] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section.

[0029] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A chlorinator for the production of chlorobenzene, characterized in that, It includes a first cylinder (16) and a second cylinder (17) arranged sequentially from bottom to top; the first cylinder (16) is provided with a skirt (15) at the bottom and is fixed to the ground by bolts; the lower part of the second cylinder (17) is conical and the lower end is bolted to the first cylinder (16) by a flange; the top of the second cylinder (17) is provided with a cap (14) and is bolted to the second cylinder (17) by a flange; the diameter of the second cylinder (17) is larger than the diameter of the first cylinder (16).

2. The chlorinator for producing chlorobenzene according to claim 1, characterized in that, The first cylinder (16) has a benzene inlet (2) and a chlorine inlet (3) arranged sequentially from bottom to top on one side of the lower section for introducing benzene and chlorine; a packing cavity (13) is provided inside the middle section of the first cylinder (16) for setting packing; a support plate (6) is provided at the bottom of the middle section of the packing cavity (13) for supporting the packing; and a chlorine liquid outlet (10) is provided on the top side wall of the first cylinder (16).

3. A chlorinator for producing chlorobenzene according to claim 2, characterized in that, A packing outlet (4) is provided on the bottom side wall of the packing cavity (13) above the support plate (6); a packing inlet (8) is provided on the top side wall of the packing cavity (13).

4. A chlorinator for producing chlorobenzene according to claim 3, characterized in that, A thermometer placement hole 1 (7) is provided on the middle side wall of the packing cavity (13), and a thermometer placement hole 2 (9) is provided on the side wall of the packing cavity (13) above the packing inlet (8).

5. A chlorinator for producing chlorobenzene according to claim 2, characterized in that, The bottom side of the first cylinder (16) is provided with an acid discharge port (1) for discharging waste acid water.

6. A chlorinator for producing chlorobenzene according to claim 1, characterized in that, The second cylinder (17) is provided with a hydrogen chloride outlet (12) at the top for discharging hydrogen chloride gas and benzene vapor; a pressure balance port (11) is provided on the middle side wall of the second cylinder (17).

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