A production device for preparing dichlorobutene by photochlorination of butadiene

Abstract

A kind of production device of preparing dichlorobutene by photochlorination of butadiene, cooling jacket is arranged outside reaction kettle, to cool the reaction kettle;At the same time, the solution in the reaction kettle is transported to cooling device by circulating pump through circulating pipe and exchanges heat with cooling medium, the contact area of material and cooling medium is increased, the cooling efficiency of solution in the reaction kettle is improved, the chlorination reaction is more efficient, to reduce the purpose of chlorination equipment number;The production device sets light source in the reaction kettle, reduces the loss of light intensity, adopts coil pipe form, increases the illumination area, effectively improves the chlorination reaction rate, at the same time, the inside of coil pipe is passed through condensing medium, can take away the heat of light emission and reaction emission in time, prolongs the service life of light emitting device.

Description

Technical Background

[0001] This invention application relates to a production apparatus for preparing dichlorobutene from photochlorinated butadiene, belonging to the field of dichlorobutene generation process. Background Technology

[0002] Dichlorobutene is a fundamental monomer in the butadiene-based production of chloroprene rubber and a valuable intermediate in certain pharmaceutical and important polyamide synthesis processes. Traditional dichlorobutene synthesis uses a gas-phase chlorination reactor, a method that has been industrialized for many years. However, due to the high reaction temperature and pressure, and the need to recycle large quantities of butadiene, it is not only energy-intensive but also poses certain safety hazards. Liquid-phase chlorination synthesis of dichlorobutene involves a large amount of solvent, and the equipment required to remove the solvent from low-boiling-point, dichlorobutene, and high-boiling-point substances in a distillation column requires substantial investment, making it unattractive for industrial application. Photochlorination reactors offer cleaner operation and higher yields, making them more suitable for industrial production. Chlorination is a strongly exothermic process, and poor mixing, mass transfer, and heat transfer in the reactor result in low reaction efficiency. Furthermore, photochlorination reactions also require consideration of light utilization efficiency and heat dissipation from the light source. Summary of the Invention

[0003] The purpose of this invention application is to provide a production device for the photochlorination of butadiene to dichlorobutene that has good heat transfer effect, short chlorination cycle, fewer equipment sets, large capacity, and long service life, so as to be more suitable for industrial production needs.

[0004] To achieve the above objectives, the technical solution provided in this invention application is as follows: a production apparatus for preparing dichlorobutene from photochlorinated butadiene, comprising a chlorination reactor, a jacket fixedly installed on the outside of the chlorination reactor, a cooling medium entering the jacket from the bottom right side inlet 1 and exiting from the top right side outlet 1 to cool the outer wall of the chlorination reactor, thereby removing the heat of the chlorination reaction; a circulation pipe 1 fixedly connected to the upper left side of the chlorination reactor, the outlet of the circulation pipe 1 connected to the inlet of a cooling device, a cooling pipe 2 symmetrically distributed at equal intervals inside the cooling device, a cooling medium entering the cooling device from the second inlet 2 and exiting from the second outlet, the outlet of the cooling device connected to the second circulation pipe, a circulation pump installed on the second circulation pipe, the circulation pump transporting the reaction medium solution inside the chlorination reactor through the first circulation pipe to the cooling device for heat exchange with the cooling medium, and then transporting it back to the chlorination reactor through the second circulation pipe, to further reduce the temperature of the solution inside the chlorination reactor, and also to ensure sufficient contact between the materials inside the chlorination reactor, thereby not only increasing the reaction rate but also improving the chlorination reaction conversion. The chlorination reactor has a discharge port fixedly connected to its bottom; a microporous gas distributor is fixedly connected to its bottom; a lid is fixedly connected to its top, and a pressure relief valve, a feed port, and a pressure sensor are sequentially fixed to the left side of the lid; a drive motor is fixedly connected to the top of the lid, and a stirrer is fixedly connected to the bottom of the drive motor, with the stirrer located inside the reactor; the reactor also has a double-layer coil inside, with the outer layer of the coil made of a material that can transmit the peak spectrum of LEDs, and LEDs fixedly connected between the inner and outer layers of the coil. The LEDs provide energy for the chlorination reaction through the outer layer. Due to the design of the coil, the illumination area is increased, and the light source is located inside the reactor, reducing light intensity loss and effectively improving the chlorination reaction rate; the space enclosed by the inner layer is equipped with a cooling medium channel, with the cooling medium inlet three and outlet three both connected to the lid. The cooling medium enters the cooling medium channel through inlet three, carries away the heat dissipation of the LEDs, and flows out through outlet three, maintaining the working environment of the LEDs within a certain range and effectively extending the lifespan of the LEDs.

[0005] This invention provides a production apparatus for preparing dichlorobutene from photochlorinated butadiene, which has the following beneficial effects:

[0006] 1. This production apparatus for preparing dichlorobutene from photochlorinated butadiene utilizes a jacket installed outside the reactor. Simultaneously, a circulating pump transports the solution from the reactor to a cooling device via a circulation pipe, exchanging heat with the cooling medium. This increases the contact area between the material and the cooling medium, improving the cooling efficiency of the solution within the reactor and making the chlorination reaction more efficient. This reduces the number of chlorination equipment units required.

[0007] 2. The production apparatus for preparing dichlorobutene from photochlorinated butadiene is equipped with a microporous gas distributor at the bottom of the reactor. At the same time, the self-priming agitator generates negative pressure when rotating in the liquid, which allows the gas and liquid phases to contact better and improves the conversion rate of the chlorination reaction.

[0008] 3. The production apparatus for preparing dichlorobutene from photochlorinated butadiene places the light source inside the reaction vessel to reduce light intensity loss. The use of a coil increases the illumination area and effectively improves the chlorination reaction rate. At the same time, the coil is circulated with a condensing medium, which can promptly remove the heat dissipated by the light emission and reaction, thus extending the service life of the light-emitting device. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of the present invention.

[0010] Figure 2 This is a cross-sectional structural schematic diagram of the present invention application;

[0011] Figure 3 This is a cross-sectional view of the coil used in this invention application.

[0012] In the diagram: 1. Chlorination reactor; 2. Jacket; 3. Inlet 1; 4. Outlet 1; 5. Circulation pipe 1; 6. Circulation pipe 2; 7. Cooling device; 8. Inlet 2; 9. Outlet 2; 10. Circulation pump; 11. Discharge port; 12. Microporous gas distributor; 13. Reactor lid; 14. Pressure relief valve; 15. Feed inlet; 16. Pressure sensor; 17. Drive motor; 18. Stirrer; A. Coil; 19. Outer layer; 20. LED light; 21. Inner layer; 22. Cooling medium channel; 23. Inlet 3; 24. Outlet 3; 25. Gas delivery pipe; 26. Gas source. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0014] 1. See reference Figures 1 to 3This embodiment provides a technical solution: a production apparatus for preparing dichlorobutene from photochlorinated butadiene, comprising a chlorination reactor 1, a jacket 2 fixedly installed on the outside of the chlorination reactor 1, a cooling medium entering the jacket 2 from the bottom right side inlet 3 and exiting from the top right side outlet 4 to cool the outer wall of the chlorination reactor 1, thereby removing the heat of the chlorination reaction; a circulation pipe 5 fixedly connected to the upper left side of the chlorination reactor 1, the outlet of the circulation pipe 5 connected to the inlet of a cooling device 7, the cooling device 7 having cooling pipes symmetrically distributed at equal intervals, the cooling medium entering from the bottom right side inlet 4... The solution enters the cooling device 7 and flows out from outlet 9. The outlet of the cooling device 7 is connected to circulation pipe 6, which is equipped with circulation pump 10. Circulation pump 10 transports the reaction medium solution inside the chlorination reactor 1 through circulation pipe 5 to the cooling device 7 for heat exchange with the cooling medium, and then through circulation pipe 6 back into the chlorination reactor 1. This further reduces the temperature of the solution inside the chlorination reactor 1 and ensures sufficient contact between the materials, thus increasing both the reaction rate and the chlorination conversion rate. A discharge port 11 is fixedly connected to the bottom of the chlorination reactor 1. A microporous gas distributor 12 is fixedly connected to the bottom of the chlorination reactor 1. A reactor lid 13 is fixedly connected to the top of the chlorination reactor 1. A pressure relief valve 14, a feed inlet 15, and a pressure sensor 16 are sequentially fixed to the upper left side. A drive motor 17 is fixedly connected to the top of the reactor lid 13, and a stirrer 18 is fixedly connected to the bottom of the drive motor 17. The stirrer 18 is located inside the reactor 1. A double-layer coil A is also installed inside the chlorination reactor 1. The outer layer 19 of the coil A is made of a material that can transmit the peak spectrum of LEDs. An LED lamp 20 is fixedly connected between the inner layer 21 and the outer layer 19 of the coil. The LED lamp 20 provides energy for the chlorination reaction through the outer layer 19. Due to the design of the coil, the illumination area is increased. At the same time, the light source is located inside the reactor, which reduces the light intensity loss and effectively improves the chlorination reaction rate. The space enclosed by the inner layer 21 is provided with a cooling medium channel 22. The cooling medium inlet 3 23 and outlet 3 24 are both connected to the reactor lid 13. The cooling medium enters the cooling medium channel 22 through the inlet 3 23, carries away the heat dissipation of the LED lamp, and flows out through the outlet 3 24, maintaining the working environment of the LED lamp within a certain range and effectively extending the service life of the LED lamp 20.

[0015] The above production equipment has good heat transfer effect through multiple cooling and temperature reduction measures, good mass transfer effect by using a combination of self-priming agitator and microporous gas distributor, high overall chlorination reaction efficiency, clean light energy and improved energy utilization rate, making it very suitable for industrial production.

[0016] The embodiments described in this application do not constitute a limitation on the scope of protection of this application. Any modifications, equivalent substitutions, etc., made by those skilled in the art within the spirit and principles of this invention should be covered within the scope of protection of this application.

Claims

1. A production apparatus for preparing dichlorobutene from photochlorinated butadiene, comprising a chlorination reactor (1), a jacket (2) fixedly installed on the outside of the chlorination reactor (1), a cooling medium entering the jacket (2) from the bottom right side inlet (3) and flowing out from the top right side outlet (4) to cool the outer wall of the chlorination reactor (1) and remove the heat of chlorination reaction; a circulation pipe (5) fixedly connected to the upper left side of the chlorination reactor (1), the outlet of the circulation pipe (5) being connected to the inlet of a cooling device (7), and the cooling device (7) being internally equipped with Cooling pipes are provided, and the cooling pipes are symmetrically distributed at equal intervals. The cooling medium enters the cooling device (7) through inlet two (8) and flows out through outlet two (9). The outlet of the cooling device (7) is connected to circulation pipe two (6). Circulation pump (10) is installed on circulation pipe two (6). Through circulation pump (10), the reaction medium solution inside the chlorination reactor (1) is transported to the cooling device (7) through circulation pipe one (5) to exchange heat with the cooling medium, and then transported to the chlorination reactor (1) through circulation pipe two (6). The bottom of the chlorination reactor (1) is fixedly connected to The reactor has a discharge port (11); a microporous gas distributor (12) is fixedly connected to the bottom of the chlorination reactor (1); a lid (13) is fixedly connected to the top of the chlorination reactor (1), and a pressure relief valve (14), a feed inlet (15), and a pressure sensor (16) are fixedly connected to the left side of the lid (13); a drive motor (17) is fixedly connected to the top of the lid (13), and a stirrer (18) is fixedly connected to the bottom of the drive motor (17), and the stirrer (18) is located inside the chlorination reactor (1); a double-sided gas distribution device is also provided inside the chlorination reactor (1). The outer layer (19) of the coil is made of a material that can transmit the peak spectrum of LEDs. The inner layer (21) and the outer layer (19) of the coil are fixedly connected to LEDs (20). The LEDs (20) provide energy for the chlorination reaction through the outer layer (19). The space enclosed by the inner layer (21) is provided with a cooling medium channel (22). The cooling medium inlet three (23) and outlet three (24) are both connected to the lid (13). The cooling medium enters the cooling medium channel (22) through the inlet three (23), carries away the LEDs (20) to emit light and dissipate heat, and then flows out through the outlet three (24).

2. The production apparatus for preparing dichlorobutene from photochlorinated butadiene according to claim 1, wherein a valve is provided at the bottom of the discharge port (11); the stirrer (18) is a self-priming stirrer; a gas delivery pipe (25) is fixedly connected to the bottom of the microporous gas distributor (12), the bottom of the gas delivery pipe (25) extends to the outside of the chlorination reactor (1), and a gas source (26) is fixedly connected to the right end of the gas delivery pipe (25).

3. The production apparatus for preparing dichlorobutene from photochlorinated butadiene according to claim 1, wherein the reactants added to the feed inlet (15) include solvent and catalyst; the photochlorination reaction of butadiene occurs in the chlorination reactor (1) to generate dichlorobutene, which flows out from the discharge port, and the pressure of the chlorination reactor (1) is set to 10 MPa.

4. The production apparatus for preparing dichlorobutene from photochlorobutadiene according to claim 1, wherein the LED lamp (20) is a white LED with a wavelength of 650-700nm or a blue LED with a wavelength of 465-470nm or one or more.

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