CN219273027U - Optical chlorination reactor for producing 1-chloro-1, 1 difluoroethane - Google Patents
Optical chlorination reactor for producing 1-chloro-1, 1 difluoroethane Download PDFInfo
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- CN219273027U CN219273027U CN202320980427.7U CN202320980427U CN219273027U CN 219273027 U CN219273027 U CN 219273027U CN 202320980427 U CN202320980427 U CN 202320980427U CN 219273027 U CN219273027 U CN 219273027U
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Abstract
The utility model provides a photochlorination reactor for producing 1-chloro-1, 1 difluoroethane, which belongs to the technical field of photochlorination reactors and comprises a buffer, a mixer and a reaction tower, wherein the buffer, the mixer and the reaction tower are connected through pipelines in sequence; the reaction tower comprises a cylinder body, a light source is arranged inside the cylinder body, and a heat exchange device is arranged outside the cylinder body. The light source is arranged in the middle of the reaction tower, and the reflective coating is arranged on the inner side of the reaction tower, so that the illumination intensity in the reaction tower is moderate, the photochlorination reaction in the reaction tower is quickened, the conversion efficiency of 1-chloro-1, 1-difluoroethane is improved, and the generation of byproducts is reduced.
Description
Technical Field
The utility model belongs to the technical field of photochlorination reactors, and particularly relates to a photochlorination reactor for producing 1-chloro-1, 1-difluoroethane.
Background
1-chloro-1, 1 difluoroethane (HCFC-142 b for short) is a very important organic intermediate, is commonly used as a refrigerant, a foaming agent or as a raw material of vinylidene fluoride monomers, and is generally prepared into target products 1-chloro-1, 1 difluoroethane and hydrogen chloride by a method of mixing difluoroethane with equimolar chlorine and performing photocatalytic chemical reaction, and the mixed gas is purified to obtain a high-purity finished product after removing the hydrogen chloride; the photochlorination reaction equation is as follows:
Cl 2 +CH 3 CHF 2 →CH 3 CF 2 Cl+HCl，
wherein various byproducts are also produced during the photochlorination reaction.
The existing photochlorination reactor has the problem of uneven illumination distribution, which is easy to cause side reaction in photochlorination, in addition, in the prior art, difluoroethane and chlorine are unevenly mixed in the photochlorination reactor, and the local concentration of the mixed gas is higher, thereby causing the photochlorination side reaction to occur, resulting in the generation of a large amount of byproducts, and reducing the conversion rate of 1-chloro-1, 1 difluoroethane.
Disclosure of Invention
The utility model provides a photochlorination reactor for producing 1-chloro-1, 1 difluoroethane, which aims to overcome the technical problems, reduce the content of byproducts in the photochlorination reaction process and improve the conversion rate of products.
In order to solve the technical problems, the utility model adopts the following technical scheme:
a photochlorination reactor for producing 1-chloro-1, 1 difluoroethane comprises a buffer, a mixer and a reaction tower, wherein the buffer, the mixer and the reaction tower are connected through pipelines in sequence; the reaction tower comprises a cylinder body, a light source is arranged inside the cylinder body, and a heat exchange device is arranged outside the cylinder body.
According to the technical scheme, the upper end of the cylinder is provided with a discharge hole, the lower end of the cylinder is provided with a feed inlet and a liquid outlet, and the feed inlet is connected with the mixer through a pipeline.
Preferably, the mixer is provided with an air inlet and an air outlet respectively, the number of the air inlets is two, and a plurality of helical blades are arranged in the mixer.
Preferably, a plurality of temperature sensors are arranged on the cylinder body, and the temperature sensors are electrically connected with the heat exchange device.
Preferably, a distributor is arranged at the bottom end of the cylinder body, and a plurality of nozzles are arranged on the distributor.
Preferably, a spraying device is arranged at the top of the cylinder body.
Preferably, an isolation cover is arranged in the cylinder, the light sources are uniformly distributed on the inner wall of the isolation cover, and the isolation cover is made of a light-transmitting material.
Preferably, a reflective coating is arranged on the inner wall of the cylinder, and the reflective coating is a diffuse reflective coating.
Preferably, the light source is an LED light source.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model provides a photochlorination reactor for producing 1-chloro-1, 1 difluoroethane, wherein a light source is arranged in the middle of a reaction tower, and a reflective coating is arranged on the inner side of the reaction tower, so that the illumination intensity in the reaction tower is moderate, the photochlorination reaction in the reaction tower is quickened, the conversion efficiency of the 1-chloro-1, 1 difluoroethane is improved, and the generation of byproducts is reduced.
Drawings
FIG. 1 is a schematic diagram of the structure of the device of the present utility model;
FIG. 2 is a schematic cross-sectional view of the present utility mixer apparatus;
FIG. 3 is a schematic view of the structure of the distributor device of the present utility model.
In the figure: 1. buffer, 2, mixer, 3, reaction tower, 4, barrel, 5, light source, 6, heat transfer device, 7, air inlet, 8, gas outlet, 9, helical blade, 10, distributor, 11, nozzle, 12, cage, 13, reflective coating, 14, spray set, 15, discharge gate, 16, feed inlet, 17, liquid outlet, 18, temperature sensor.
Detailed Description
The following examples are set forth in order to more particularly illustrate the principles of the present utility model and are intended to provide a more thorough understanding of the present utility model, and are not intended to limit the scope of the present utility model to all other embodiments which will be apparent to those of ordinary skill in the art without undue burden.
Example 1
As shown in fig. 1 to 3, the embodiment of the utility model provides a photochlorination reactor for producing 1-chloro-1, 1 difluoroethane, which comprises a buffer 1, a mixer 2 and a reaction tower 3, wherein the buffer 1, the mixer 2 and the reaction tower 3 are connected in sequence through pipelines; the reaction tower 3 comprises a cylinder 4, a light source 5 is arranged inside the cylinder 4, and a heat exchange device 6 is arranged outside the cylinder 4. In the embodiment of the utility model, the bottom of the reaction tower 3 is connected with a raw material conveying pipeline, and mixed gas of difluoroethane and chlorine is conveyed into the reaction tower 3. Firstly, gasifying liquid chlorine and difluoroethane, fully and uniformly mixing the gasified liquid chlorine and difluoroethane according to the mol ratio of 1:1 by a mixer 2, conveying the mixed gas into a reaction tower 3, carrying out a photochlorination reaction to obtain 1-chloro-1, 1 difluoroethane, respectively connecting two sides of the top of the reaction tower 3 with alkaline washing pipelines, and absorbing byproduct hydrogen chloride in the finished product 1-chloro-1, 1 difluoroethane. Since the photochlorination reaction is exothermic, a heat exchange device 6 is arranged outside the reaction tower 3, and a refrigerant is arranged in the heat exchange device 6 for absorbing heat in the reaction tower 3 and ensuring that the temperature in the reaction tower 3 is kept within the range of 50-90 ℃. In the embodiment of the utility model, the light source 5 is arranged in the middle of the reaction tower 3 to illuminate each position in the reaction tower 3, so that the phenomenon of uneven illumination caused by unreasonable arrangement of certain light source positions is solved.
The upper end of the cylinder body 4 is provided with a discharge hole 15, the lower end of the cylinder body 4 is provided with a feed inlet 16 and a liquid outlet 17, and the feed inlet 16 is connected with the mixer 2 through a pipeline. In the embodiment of the utility model, the discharge port 15 discharges the crude gas of the 1-chloro-1, 1 difluoroethane finished product generated by the reaction, and is connected to the flow of a rectifying tower for purifying the 1-chloro-1, 1 difluoroethane finished product. The liquid outlet 17 is used for discharging liquid for washing hydrogen chloride gas and chlorine, and the hydrogen chloride gas in the washing reaction gas can be washed by water or alkali.
The mixer 2 is provided with an air inlet 7 and an air outlet 8, the number of the air inlets 7 is two, and a plurality of helical blades 9 are arranged in the mixer 2. In the embodiment of the utility model, the spiral blade 9 is arranged in the mixer 2 and is used for fully mixing chlorine and difluoroethane, and the photochlorination reaction can be accelerated, so that the generation of byproducts is reduced.
The cylinder 4 is provided with a plurality of temperature sensors 18, and the temperature sensors 18 are electrically connected with the heat exchange device 6. In the embodiment of the utility model, the temperature sensors 18 are arranged at a plurality of positions on the cylinder 4 and are used for monitoring the temperature inside the cylinder 4, so that the temperature in the reaction tower 3 is kept within the range of 50-90 ℃, the generation of byproducts is reduced, and the conversion efficiency of 1-chloro-1, 1-difluoroethane is improved.
The bottom end of the cylinder 4 is provided with a distributor 10, and the distributor 10 is provided with a plurality of nozzles 11. In the embodiment of the utility model, the distributor 10 is arranged at the bottom of the cylinder 4, is connected with the buffer 1 through a pipeline and is used for receiving the raw material gas of the photochlorination reaction, and a plurality of nozzles 11 are arranged at the upper end of the distributor 10, so that the raw material gas of the photochlorination reaction is quickly and uniformly conveyed into the reaction tower 3 through the nozzles 11 and fully reacted under the action of illumination.
The top of the cylinder 4 is provided with a spraying device 14. In the embodiment of the utility model, the spraying device 14 is arranged at the top of the cylinder 4, the crude gas generated in the photochlorination reaction contains hydrogen chloride gas and chlorine, the hydrogen chloride gas and the chlorine in the crude gas are washed by the spraying device 14, the spraying device 14 is connected with an external washing pipeline, and the hydrogen chloride gas in the crude gas in the washing reaction can be washed by water or alkali.
An isolation cover 12 is arranged in the cylinder 4, the light sources 5 are uniformly distributed on the inner wall of the isolation cover 12, and the isolation cover 12 is made of a light-transmitting material. In the embodiment of the utility model, the isolation cover 12 is arranged in the middle of the cylinder 4, the isolation cover 12 is made of a light-transmitting material, the light source is arranged in the isolation cover 12 and isolated from the inner cavity of the cylinder 4, and the light emitting direction of the light source 5 faces the inner wall direction of the cylinder 4. In the embodiment of the utility model, the inner wall of the cylinder 4 is provided with the reflective coating 13, and the reflective coating 13 is a diffuse reflective coating, so that light emitted by the light source 5 can irradiate all corners of the inner wall of the cylinder 4 after being reflected by the reflective coating 13, and the illumination intensity received by all the inside of the cylinder 4 is uniform, so that the chlorine and difluoroethane mixed gas can react in all the positions of the cylinder 4 in a reverse photochlorination manner, the generation of byproducts is reduced, and the conversion efficiency of 1-chloro-1, 1 difluoroethane is improved.
The light source 5 is an LED light source. In the embodiment of the utility model, a single-wavelength LED lamp is selected, or an LED lamp in a specific wavelength range is selected as the light source 5 of the photochlorination reactor, which is beneficial to providing a proper wavelength range for the photochlorination reaction.
The above embodiments are not intended to limit the present utility model, however, and the present utility model is not limited to the above examples, but is also intended to be within the scope of the present utility model.
Claims (8)
1. A photochlorination reactor for producing 1-chloro-1, 1 difluoroethane, characterized in that:
the device comprises a buffer (1), a mixer (2) and a reaction tower (3), wherein the buffer (1), the mixer (2) and the reaction tower (3) are connected through pipelines in sequence;
the reaction tower (3) comprises a cylinder body (4), a light source (5) is arranged in the cylinder body (4), and a heat exchange device (6) is arranged outside the cylinder body (4);
the mixer is characterized in that an air inlet (7) and an air outlet (8) are respectively arranged on the mixer (2), the number of the air inlets (7) is two, and a plurality of spiral blades (9) are arranged in the mixer (2).
2. A photochlorination reactor for producing 1-chloro-1, 1 difluoroethane according to claim 1, wherein:
the upper end of the cylinder body (4) is provided with a discharge hole (15), the lower end of the cylinder body (4) is provided with a feed inlet (16) and a liquid outlet (17), and the feed inlet (16) is connected with the mixer (2) through a pipeline.
3. A photochlorination reactor for producing 1-chloro-1, 1 difluoroethane according to claim 1, wherein:
the cylinder body (4) is provided with a plurality of temperature sensors (18), and the temperature sensors (18) are electrically connected with the heat exchange device (6).
4. A photochlorination reactor for producing 1-chloro-1, 1 difluoroethane according to claim 1, wherein:
the bottom end of the cylinder body (4) is provided with a distributor (10), and the distributor (10) is provided with a plurality of nozzles (11).
5. A photochlorination reactor for producing 1-chloro-1, 1 difluoroethane according to claim 3 or 4, characterized in that:
the top of the cylinder body (4) is provided with a spraying device (14).
6. A photochlorination reactor for producing 1-chloro-1, 1 difluoroethane according to claim 1, wherein:
an isolation cover (12) is arranged in the cylinder body (4), the light sources (5) are uniformly distributed on the inner wall of the isolation cover (12), and the isolation cover (12) is made of a light-transmitting material.
7. A photochlorination reactor for producing 1-chloro-1, 1 difluoroethane according to claim 6, wherein:
the inner wall of the cylinder body (4) is provided with a reflective coating (13), and the reflective coating (13) is a diffuse reflective coating.
8. A photochlorination reactor for producing 1-chloro-1, 1 difluoroethane according to claim 1, wherein:
the light source (5) is an LED light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320980427.7U CN219273027U (en) | 2023-04-27 | 2023-04-27 | Optical chlorination reactor for producing 1-chloro-1, 1 difluoroethane |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320980427.7U CN219273027U (en) | 2023-04-27 | 2023-04-27 | Optical chlorination reactor for producing 1-chloro-1, 1 difluoroethane |
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| CN219273027U true CN219273027U (en) | 2023-06-30 |
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| CN202320980427.7U Active CN219273027U (en) | 2023-04-27 | 2023-04-27 | Optical chlorination reactor for producing 1-chloro-1, 1 difluoroethane |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117380117A (en) * | 2023-12-08 | 2024-01-12 | 泰兴市梅兰化工有限公司 | Photochlorination reactor for producing high-energy recycling of difluorochloroethane |
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2023
- 2023-04-27 CN CN202320980427.7U patent/CN219273027U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117380117A (en) * | 2023-12-08 | 2024-01-12 | 泰兴市梅兰化工有限公司 | Photochlorination reactor for producing high-energy recycling of difluorochloroethane |
| CN117380117B (en) * | 2023-12-08 | 2024-03-22 | 泰兴市梅兰化工有限公司 | Photochlorination reactor for producing high-energy recycling of difluorochloroethane |
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