Low-temperature photochlorination production device for difluorochloroethane
By setting up a reaction tube and a chlorinated ultraviolet chamber in the difluorochloroethane production device, combining a graphite heat exchanger and a cooling water chamber, the high-temperature corrosion and inefficient heat exchange problems of traditional devices are solved, and temperature control and yield improvement are achieved.
Patent Information
- Application Number
- CN202422308159.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-09-23
AI Technical Summary
Traditional difluorochloroethane production equipment has problems with high temperature cracking and water corrosion equipment, which leads to large safety hazards and low heat exchange efficiency, which affects the reaction rate.
The reaction tube and chlorinated ultraviolet chamber are set up in the photochlorization reaction tower, combined with a graphite heat exchanger and cooling water chamber, the reaction temperature is controlled at 40-80℃ through cooling water, and the cooling water flow is adjusted using a temperature sensor and valve to improve the heat exchange efficiency.
Effective control of reaction temperature and improvement of heat exchange efficiency are achieved, the occurrence of side reactions is reduced, the reaction rate is improved, and the cold water consumption is reduced.
Smart Images
Figure CN223144706U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a chemical production device, in particular to a low-temperature photochlorination production device for difluorochloroethane. Background Art
[0002] In the industrial production of difluorochloroethane, a large amount of water and hydrofluoric acid produced by high-temperature cracking exist in the traditional sieve plate tower, which is extremely easy to corrode equipment and has great potential safety hazards. At present, an internal graphite condenser is used in the reaction tower. The graphite condenser exchanges heat with the gas phase and the heat is removed by the coolant through the graphite condenser. The heat exchange effect is poor, the reaction temperature is as high as 80-110°C, the heat removal efficiency is low, side reactions are likely to occur, and the reaction yield is affected. Summary of the Invention
[0003] The utility model provides a low-temperature photochlorination production device for difluorochloroethane with a simple structure, which can effectively control the reaction temperature at 40-80°C, ensure the heat exchange efficiency, reduce by-products and improve the yield.
[0004] The technical solution adopted by the utility model is: a low-temperature photochlorination production device for difluorochloroethane, including a photochlorination reaction tower. A plurality of reaction tubes are arranged vertically in the photochlorination reaction tower. The lower end of the reaction tube is connected to the feed inlet of the photochlorination reaction tower for difluoroethane and chlorine raw materials, and the upper end is connected to the discharge outlet of the photochlorination reaction tower. It is characterized in that: a plurality of chlorination ultraviolet chambers are arranged vertically in the photochlorination reaction tower, the reaction tubes pass through and communicate with the plurality of chlorination ultraviolet chambers up and down, ultraviolet lamps are arranged in the chlorination ultraviolet chambers, the outer wall of the photochlorination reaction tower is set as a graphite heat exchanger, or the inner wall of the photochlorination reaction tower is set with a graphite heat exchanger. The cavity between the graphite heat exchanger and the reaction tube is a cooling water cavity, and the cooling water cavity penetrates up and down in the photochlorination reaction tower. The lower part of the cooling water cavity is connected with a water inlet pipe and a water outlet pipe. A circulating pipe is led out from the high point position of the cooling water cavity under any one of the chlorination ultraviolet chambers, and the circulating pipe is connected to a three-way water inlet valve arranged on the water inlet pipe through a regulating valve.
[0005] The graphite heat exchanger is a steel graphite heat exchanger.
[0006] The circulating pipe is led out from the high point position of the cooling water cavity under the first and / or the second and / or the third chlorination ultraviolet chamber from the bottom.
[0007] Temperature sensors are arranged on the circulating pipe and the water outlet pipe, the temperature sensors are connected to a controller, and the controller is connected to the three-way water inlet valve and the regulating valve.
[0008] The water inlet pipe is connected to cold water at 5-10°C.
[0009] The beneficial effects of the utility model are:
[0010] 1. A cooling water chamber is arranged between the outside of the reaction tube and the graphite heat exchanger. The reaction tube exchanges heat with cold water at 5 - 10°C in the liquid phase successively with the cold water at 5 - 10°C in the liquid phase and the graphite heat exchanger. The heat exchange efficiency is high, the speed is fast, which is beneficial to temperature reduction, inhibits the production of side reactions, and improves the reaction yield.
[0011] 2. Through the circulation pipe and the outlet pipe, the internal heat exchange situation of the cold water and the temperature of the sent - out cold water are tested by the temperature sensor. The control valve controls the flow rate and returns to the three - way inlet valve, comprehensively controlling the full heat exchange of the cold water. The reaction temperature is controlled at 40 - 80°C, and it can effectively reduce the consumption of cold water and control the cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic structural diagram of the first embodiment of the present utility model;
[0013] Figure 2 It is a schematic structural diagram of the second embodiment of the present utility model.
[0014] In the figure: reactor shell 1, graphite heat exchanger 2, reaction tube 3, feed inlet 4, discharge outlet 5, chlorination ultraviolet chamber 6, ultraviolet lamp 7, cooling water chamber 8, inlet pipe 9, outlet pipe 10, circulation pipe 11, regulating valve 12, circulation temperature sensor 13, outlet water temperature sensor 14, three - way inlet valve 15. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0015] The following is further described with reference to the drawings.
[0016] Figure 1 The shown first embodiment: A low - temperature photochlorination production device for difluorochloroethane includes a reactor shell 1, a graphite heat exchanger 2, a reaction tube 3, a feed inlet 4, a discharge outlet 5, a chlorination ultraviolet chamber 6, an ultraviolet lamp 7, a cooling water chamber 8, an inlet pipe 9, an outlet pipe 10, a circulation pipe 11, a regulating valve 12, a circulation temperature sensor 13, an outlet water temperature sensor 14, and a three - way inlet valve 15.
[0017] On the inner wall of the reactor shell 1 of the photochlorination reaction tower, a graphite heat exchanger 2 is provided. Inside the graphite heat exchanger 2, multiple reaction tubes 3 are arranged in the up and down direction. The lower end of the reaction tube 3 is connected to the photochlorination reaction tower feed inlet 4 for difluoroethane and chlorine raw materials, and the upper end is connected to the photochlorination reaction tower discharge outlet 5. Multiple chlorination ultraviolet chambers 6 are arranged in the up and down direction inside the graphite heat exchanger 2. The reaction tubes 3 penetrate through and communicate with multiple chlorination ultraviolet chambers 6 up and down. Ultraviolet lamps 7 are arranged inside the chlorination ultraviolet chambers 6; the cavity between the graphite heat exchanger 2 and the reaction tubes 3 is a cooling water chamber 8. The cooling water chamber 8 runs through up and down inside the photochlorination reaction tower. The lower part of the cooling water chamber 8 is connected to a water inlet pipe 9, and the lower part is connected to a water outlet pipe 10. Since the feed inlet directly enters the lowermost first photochlorination ultraviolet chamber inside the reactor shell 1, and the water inlet pipe is connected to the cooling water chamber under the lowermost second photochlorination ultraviolet chamber, a circulation pipe 11 is connected at the high point position of the cooling water chamber under the lowermost second photochlorination ultraviolet chamber. A circulation temperature sensor 13 and a regulating valve 12 are successively arranged on the circulation pipe 11 and connected to a three-way water inlet valve 15 arranged on the water inlet pipe 9. An outlet water temperature sensor 14 is also arranged on the water outlet pipe 10. The regulating valve, the three-way water inlet valve, and each temperature sensor are all connected to a controller.
[0018] Figure 2 In the second embodiment shown, the difference between a difluorochloroethane low-temperature photochlorination production device and the first embodiment is that: three circulation pipes 11 are respectively connected at the high point positions of the cooling water chambers under the lowermost second, third, and fourth photochlorination ultraviolet chambers. A circulation temperature sensor 13 and a regulating valve 12 are successively arranged on each circulation pipe 11 and connected to a three-way water inlet valve 15 arranged on the water inlet pipe 9. An outlet water temperature sensor 14 is also arranged on the water outlet pipe 10. The regulating valve, the three-way water inlet valve, and each temperature sensor are all connected to a controller.
[0019] On the basis of the above embodiments, the connection positions of the circulation pipes can be adjusted according to the actual production process, temperature control, and cold water heat exchange efficiency and speed, or multiple points can be connected, all within the protection scope of this application.
Claims
1. A low-temperature photochlorination production device for difluorochloroethane, comprising a photochlorination reaction tower. A plurality of reaction tubes in the up-and-down direction are arranged in the photochlorination reaction tower. The lower end of the reaction tube is connected to the feed inlet of the photochlorination reaction tower for difluoroethane and chlorine raw materials, and the upper end is connected to the discharge outlet of the photochlorination reaction tower. It is characterized in that: A plurality of chlorination ultraviolet chambers are arranged vertically in the photo-chlorination reaction tower. The reaction tubes penetrate and communicate with the plurality of chlorination ultraviolet chambers up and down. Ultraviolet lamps are arranged in the chlorination ultraviolet chambers. The outer wall of the photo-chlorination reaction tower is provided as a graphite heat exchanger, or the inner wall of the photo-chlorination reaction tower is provided with a graphite heat exchanger. The cavity between the graphite heat exchanger and the reaction tubes is a cooling water chamber, which penetrates up and down in the photo-chlorination reaction tower. The lower part of the cooling water chamber is connected with a water inlet pipe and a water outlet pipe. A circulation pipe is led out from the high point position of the cooling water chamber under any one of the chlorination ultraviolet chambers, and the circulation pipe is connected to a three-way water inlet valve arranged on the water inlet pipe through a regulating valve.
2. The production device for low-temperature photochlorination of difluorochloroethane according to claim 1, wherein: The graphite heat exchanger is a steel graphite heat exchanger.
3. The production device for dichlorofluoroethane by low-temperature photochlorination according to claim 1, characterized in that: A circulation pipe is led out from the high point position of the cooling water chamber under the first and / or the second and / or the third chlorination ultraviolet chamber from the bottom.
4. A low-temperature photochlorination production device for difluorochloroethane according to claim 1 or 3, characterized in that: Temperature sensors are arranged on the circulation pipe and the water outlet pipe. The temperature sensors are connected to a controller, and the controller is connected to the three-way water inlet valve and the regulating valve.
5. The low-temperature photochlorination production device for difluorochloroethane according to claim 1, characterized in that: The water inlet pipe is connected to cold water at 5-10 °C.