Chlorination reactor for the preparation of dichloropropanol from glycerol

Abstract

The utility model relates to chlorination reaction equipment technical field, specifically disclose a kind of glycerol chlorination preparation dichloropropanol's chlorination reactor, including reactor main body, reactor main body whole is S-shaped structure, the bottom of reactor main body one end is fixedly connected with glycerol feed pipe, the top of reactor main body one end is fixedly connected with dichloropropanol discharge pipe, the top of glycerol feed pipe is fixedly connected with hydrogen chloride gas inlet pipe, one end of hydrogen chloride gas inlet pipe is through glycerol feed pipe and extends to the inside chamber of reactor main body close to the one end of dichloropropanol discharge pipe, and the outer surface of hydrogen chloride gas inlet pipe is evenly and interval fixedly connected with several groups of nozzle, and the one end of nozzle away from hydrogen chloride gas inlet pipe is equipped with several gas injection holes, and nozzle is in and is provided with even injection mechanism. The utility model can be even dispersed to reactor main body by the way of hydrogen chloride gas injection, replace the mode of traditional bottom ventilation cooperation mechanical stirring, energy consumption is lower, and the danger is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of chlorination reaction equipment, specifically disclosing a chlorination reactor for the preparation of dichloropropanol by chlorination of glycerol. Background Technology

[0002] Dichloropropanol is an important organochlorine compound and chemical intermediate. Its main and core use is as an intermediate in the production of epichlorohydrin. Dichloropropanol is mostly produced using glycerol and hydrogen chloride as raw materials. First, glycerol undergoes hydrochlorination to produce 1-chloropropanediol and water. Then, hydrogen chloride gas dissolved in the reaction solution reacts with glycerol and 1-chloropropanediol to produce dichloropropanol.

[0003] Most existing glycerol chlorination reactors use mechanical stirring, and hydrogen chloride is introduced from the bottom of the reactor for the reaction. This method has problems such as uneven gas distribution, more side reactions, high mechanical stirring power, and high energy consumption. Utility Model Content

[0004] In view of the shortcomings of the prior art, the present invention provides a chlorination reactor for the preparation of dichloropropanol by chlorination of glycerol, which eliminates the mechanical stirring used in the prior art and enables uniform gas distribution and a larger gas-liquid contact area.

[0005] The technical solution adopted by this utility model to solve its technical problem is: The chlorination reactor for preparing dichloropropanol by chlorination of glycerol includes a reactor body, which is generally S-shaped. A glycerol feed pipe is fixedly connected to one end of the bottom of the reactor body, and a dichloropropanol discharge pipe is fixedly connected to one end of the top of the reactor body. A hydrogen chloride inlet pipe is fixedly connected to the top of the glycerol feed pipe. One end of the hydrogen chloride inlet pipe passes through the glycerol feed pipe and extends to the inner cavity of the reactor body near the end of the dichloropropanol discharge pipe. Several sets of nozzles are uniformly and spacedly fixedly connected to the outer surface of the hydrogen chloride inlet pipe. Several jet holes are opened at the end of the nozzles away from the hydrogen chloride inlet pipe, and a uniform spraying mechanism is provided inside the nozzles.

[0006] Furthermore, the nozzle has an overall L-shaped structure, and each group of nozzles includes several nozzles that are evenly and spaced apart along the circumference of the hydrogen chloride inlet pipe.

[0007] Furthermore, the uniform injection mechanism includes a flow equalization chamber located in the nozzle cavity near the hydrogen chloride inlet pipe, and the flow equalization chamber has an overall cylindrical structure.

[0008] Furthermore, the outer surface of the hydrogen chloride inlet pipe is fitted with several nozzles and has several through holes, the diameter of which is smaller than the diameter of the flow equalization chamber.

[0009] Furthermore, the uniform injection mechanism also includes a flow guide chamber located on the side of the nozzle cavity away from the hydrogen chloride inlet pipe. The flow guide chamber and the flow uniform chamber are connected, and the flow guide chamber is cylindrical in shape.

[0010] Furthermore, a number of guide vanes are uniformly and fixedly arranged in the guide chamber, and the guide vanes are arranged in parallel.

[0011] Furthermore, a nozzle is fixedly connected to the end of the flow guide chamber away from the flow equalization chamber. The nozzle has a trumpet-shaped structure with openings at both ends, and the small-diameter end of the nozzle is connected to the flow guide chamber. Several air jet holes are evenly and spaced apart at the large-diameter end of the nozzle.

[0012] Furthermore, steam pipes are fixedly fitted on both sides and the middle of the outer surface of the reactor body. The three sets of steam pipes are arranged in parallel, and several sets of nozzles are located inside the three sets of steam pipes.

[0013] Furthermore, each of the three sets of steam pipes has a steam inlet at the top end near the dichloropropanol outlet pipe and a steam outlet at the bottom end near the glycerol inlet pipe.

[0014] Furthermore, the end of the hydrogen chloride inlet pipe near the dichloropropanol outlet pipe is closed.

[0015] The beneficial effects of this utility model are: This invention utilizes a uniform injection mechanism to evenly disperse hydrogen chloride gas into the reactor body via injection, replacing the traditional bottom aeration combined with mechanical stirring method. This reduces energy consumption and lowers the risk. Hydrogen chloride gas is dispersed and injected into the reactor body through several sets of nozzles and air jets. The mixture of hydrogen chloride gas, glycerol, and adipic acid simultaneously mixes and reacts within the reactor body. Compared to traditional tubular reactors that rely on flow mixing, this device increases the gas-liquid contact area, achieving high-intensity mixing and resulting in a more uniform and thorough reaction. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic cross-sectional view of the longitudinal section of the present invention; Figure 3 for Figure 2 Enlarged structural diagram at point A; Figure 4 This is a schematic diagram of the air jet hole and nozzle of this utility model.

[0017] In the diagram: 1. Reactor body; 2. Glycerol feed pipe; 3. Dichloropropanol discharge pipe; 4. Hydrogen chloride inlet pipe; 5. Nozzle; 6. Jet hole; 7. Flow equalization chamber; 8. Through hole; 9. Flow guide chamber; 10. Flow guide vane; 11. Nozzle; 12. Steam pipe; 13. Steam inlet; 14. Steam outlet. Detailed Implementation

[0018] The present invention will now be described and explained in detail with reference to the accompanying drawings.

[0019] Example 1 like Figure 1-4 As shown, the chlorination reactor for preparing dichloropropanol by chlorination of glycerol includes a reactor body 1, which is generally S-shaped. A glycerol feed pipe 2 is fixedly connected to one end of the bottom of the reactor body 1, and a dichloropropanol discharge pipe 3 is fixedly connected to one end of the top of the reactor body 1. A hydrogen chloride inlet pipe 4 is fixedly connected to the top end of the glycerol feed pipe 2. One end of the hydrogen chloride inlet pipe 4 passes through the glycerol feed pipe 2 and extends to the end of the reactor body 1 near the dichloropropanol discharge pipe 3. Several sets of nozzles 5 are uniformly and spacedly fixedly connected to the outer surface of the hydrogen chloride inlet pipe 4. Several jet holes 6 are opened at the end of the nozzles 5 away from the hydrogen chloride inlet pipe 4, and a uniform spraying mechanism is provided inside the nozzles 5.

[0020] With the above settings, the hydrogen chloride inlet pipe 4 is pressurized to 2MPa, and the reaction temperature is controlled at 120-130℃. By setting a uniform injection mechanism, hydrogen chloride gas can be evenly dispersed into the reactor body 1 through injection, replacing the traditional bottom aeration combined with mechanical stirring mode, which has lower energy consumption and can reduce the risk. Hydrogen chloride gas is dispersed and injected into the reactor body 1 through several sets of nozzles 5 and jet holes 6. The hydrogen chloride gas, glycerol and adipic acid mixture are mixed and reacted simultaneously in the reactor body 1. Compared with the traditional tubular reactor that mixes by flow, this device increases the gas-liquid contact area, achieves high-intensity mixing, and the reaction is more uniform and thorough.

[0021] The nozzle 5 has an overall L-shaped structure, and each group of nozzles 5 includes several nozzles 5 that are evenly and spaced apart along the circumference of the hydrogen chloride inlet pipe 4.

[0022] With the above settings, the nozzle 5 is configured as an L-shaped structure, which can change the injection direction of hydrogen chloride gas within the reactor body 1, making the entire device structure more compact and more integrated.

[0023] The uniform injection mechanism includes a flow equalization chamber 7 located in the inner cavity of the nozzle 5 near the hydrogen chloride inlet pipe 4. The flow equalization chamber 7 has an overall cylindrical structure.

[0024] The outer surface of the hydrogen chloride inlet pipe 4 is fitted with several nozzles 5 and has several through holes 8, and the diameter of the through holes 8 is smaller than the diameter of the flow equalization chamber 7.

[0025] With the above configuration, the diameter of the through hole 8 is smaller than the diameter of the flow equalization chamber 7, which allows the high-speed hydrogen chloride gas to expand and decelerate rapidly, converting its kinetic energy into pressure energy, making the pressure in the flow equalization chamber 7 more uniform, and providing stable inflow conditions for subsequent flow guidance work.

[0026] The uniform injection mechanism also includes a flow guide chamber 9 located on the side of the nozzle 5 away from the hydrogen chloride inlet pipe 4. The flow equalization chamber 7 and the flow guide chamber 9 are connected, and the flow guide chamber 9 has an overall cylindrical structure.

[0027] A number of guide vanes 10 are uniformly and fixedly arranged in the flow chamber 9, and the guide vanes 10 are arranged in parallel.

[0028] With the above configuration, several guide vanes 10 are arranged in parallel, which can cut hydrogen chloride gas into several small, parallel streams, forcing the hydrogen chloride gas to flow along the axial direction of the guide chamber 9, greatly reducing tangential velocity and eddies.

[0029] A nozzle 11 is fixedly connected to the end of the flow guide chamber 9 away from the flow equalization chamber 7. The nozzle 11 has a trumpet-shaped structure with openings at both ends, and the small diameter end of the nozzle 11 is connected to the flow guide chamber 9. Several air jet holes 6 are evenly and spaced apart at the large diameter end of the nozzle 11.

[0030] With the above configuration, the nozzle 11 has a funnel-shaped structure with openings at both ends, which allows for a larger spray area of ​​hydrogen chloride gas, further increasing the gas-liquid contact area and ensuring the full progress of the reaction.

[0031] Steam pipes 12 are fixedly fitted on both sides and the middle of the outer surface of the reactor body 1. The three sets of steam pipes 12 are arranged in parallel, and several sets of nozzles 5 are located inside the three sets of steam pipes 12.

[0032] Steam inlets 13 are provided at the top of each of the three sets of steam pipes 12 near the dichloropropanol discharge pipe 3, and steam outlets 14 are provided at the bottom of each of the three sets of steam pipes 12 near the glycerol feed pipe 2.

[0033] With the above configuration, the inner wall of the steam pipe 12 and the outer wall of the reactor body 1 are spaced apart. When the temperature inside the reactor body 1 is low, the steam inlet 13 and the steam outlet 14 are opened. High-temperature steam is introduced into the space between the inner wall of the steam pipe 12 and the outer wall of the reactor body 1 through the steam inlet 13. After heating the reactor body 1, the high-temperature steam is discharged through the steam outlet 14.

[0034] The hydrogen chloride inlet pipe 4 is closed at one end near the dichloropropanol outlet pipe 3.

[0035] Working principle and process: A mixture of glycerol and adipic acid enters the reactor body 1 through the glycerol feed pipe 2. Hydrogen chloride enters the reactor body 1 through the hydrogen chloride inlet pipe 4, and then enters the flow equalization chamber 7 through the through hole 8. The diameter of the flow equalization chamber 7 is larger than the diameter of the through hole 8, which can reduce the velocity of hydrogen chloride and stabilize the pressure in the flow equalization chamber 7. Then, the hydrogen chloride enters the guide chamber 9, where several guide vanes 10 can eliminate vortices and streamline the flow lines. Finally, the hydrogen chloride is evenly dispersed into the mixture of glycerol and adipic acid through several jet holes 6, and reacts fully with glycerol. The resulting dichloropropanol is discharged through the dichloropropanol outlet pipe 3. When the temperature inside the reactor body 1 is low, the steam inlet 13 and the steam outlet 14 are opened to heat the reaction liquid by inputting high-temperature steam.

Claims

1. A chlorination reactor for the preparation of dichloropropanol by chlorination of glycerol, comprising a reactor body (1), characterized in that, The reactor body (1) is S-shaped. A glycerol feed pipe (2) is fixedly connected to one end of the bottom of the reactor body (1). A dichloropropanol discharge pipe (3) is fixedly connected to one end of the top of the reactor body (1). A hydrogen chloride inlet pipe (4) is fixedly connected to the top of the glycerol feed pipe (2). One end of the hydrogen chloride inlet pipe (4) passes through the glycerol feed pipe (2) and extends to the end of the reactor body (1) near the dichloropropanol discharge pipe (3). Several sets of nozzles (5) are fixedly connected uniformly and at intervals on the outer surface of the hydrogen chloride inlet pipe (4). Several jet holes (6) are opened at the end of the nozzle (5) away from the hydrogen chloride inlet pipe (4). A uniform spraying mechanism is provided inside the nozzle (5).

2. The chlorination reactor for preparing dichloropropanol by chlorination of glycerol according to claim 1, characterized in that, The nozzle (5) has an overall L-shaped structure. Each group of nozzles (5) includes several nozzles (5) that are evenly and spaced apart along the circumference of the hydrogen chloride inlet pipe (4).

3. The chlorination reactor for preparing dichloropropanol by chlorination of glycerol according to claim 2, characterized in that, The uniform injection mechanism includes a flow equalization chamber (7) located in the inner cavity of the nozzle (5) near the hydrogen chloride inlet pipe (4), and the flow equalization chamber (7) is cylindrical in shape.

4. The chlorination reactor for preparing dichloropropanol by chlorination of glycerol according to claim 3, characterized in that, The outer surface of the hydrogen chloride inlet pipe (4) is fitted with several nozzles (5) and has several through holes (8), and the diameter of the through holes (8) is smaller than the diameter of the flow equalization chamber (7).

5. The chlorination reactor for preparing dichloropropanol by chlorination of glycerol according to claim 3, characterized in that, The uniform injection mechanism also includes a flow guide chamber (9) located on the side of the nozzle (5) away from the hydrogen chloride inlet pipe (4). The flow equalization chamber (7) and the flow guide chamber (9) are connected, and the flow guide chamber (9) is cylindrical in shape.

6. The chlorination reactor for preparing dichloropropanol by chlorination of glycerol according to claim 5, characterized in that, Several guide vanes (10) are uniformly and fixedly arranged in the flow chamber (9), and the several guide vanes (10) are arranged in parallel.

7. The chlorination reactor for preparing dichloropropanol by chlorination of glycerol according to claim 5, characterized in that, A nozzle (11) is fixedly connected to one end of the flow guide chamber (9) away from the flow equalization chamber (7). The nozzle (11) has a trumpet-shaped structure with openings at both ends. The small diameter end of the nozzle (11) is connected to the flow guide chamber (9). Several jet holes (6) are evenly and spaced on the large diameter end of the nozzle (11).

8. The chlorination reactor for preparing dichloropropanol by chlorination of glycerol according to claim 1, characterized in that, Steam pipes (12) are fixedly fitted on both sides and the middle of the outer surface of the reactor body (1). The three sets of steam pipes (12) are arranged in parallel, and several sets of nozzles (5) are located inside the three sets of steam pipes (12).

9. The chlorination reactor for preparing dichloropropanol by chlorination of glycerol according to claim 7, characterized in that, The top of each of the three sets of steam pipes (12) near the dichloropropanol discharge pipe (3) is provided with a steam inlet (13), and the bottom of each of the three sets of steam pipes (12) near the glycerol feed pipe (2) is provided with a steam outlet (14).

10. The chlorination reactor for preparing dichloropropanol by chlorination of glycerol according to claim 1, characterized in that, The hydrogen chloride inlet pipe (4) is closed at one end near the dichloropropanol outlet pipe (3).

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