External circulation enhanced hydration reactor

Abstract

The utility model discloses an external circulation strengthening type hydration reactor, which relates to the technical field of hydration reactors and comprises a barrel, a stirrer driving motor and a standby motor are arranged above the barrel, the output of the stirrer driving motor and the standby motor is fixedly connected with a stirrer shaft in the barrel, and the stirrer shaft is fixedly connected with stirrer blades. One side of the cylinder body is provided with an oil phase feed port for inputting water and cycloethylene, the oil phase feed port is communicated with an oil phase distributor in the cylinder body, the other side of the cylinder body is provided with a water phase feed port for inputting a catalyst, the right end of the cylinder body is provided with a second coil medium outlet / inlet, and the right end of the cylinder body is provided with a second coil medium outlet / inlet. The medium outlet / inlet of the second coil pipe is communicated with a heating / cooling coil pipe used for taking out heat inside the cylinder body, on the premise that the flow speed of reactants is kept appropriate, the contact reaction retention time between the reactants is effectively prolonged by adjusting the flow channel structure or operation parameters inside the reactor, the reaction is sufficient, and the reaction conversion rate is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of hydration reactor, concretely is a kind of external circulation enhanced hydration reactor. BACKGROUND

[0002] Cyclohexanol, as the cornerstone raw material in chemical industry, is widely used in the production of adipic acid, hexamethylene diamine, cyclohexanone and caprolactam, and its unique properties also give it an indispensable role in soap stabilizer, disinfectant soap, detergent manufacturing, and rubber, resin, nitro fiber and other material processing. In addition, as a solvent, coating additive, leather treatment agent and fiber finishing agent, the use of cyclohexanol is extensive and far-reaching, and it is an important precursor for the production of plasticizers, pesticides and other products.

[0003] For a long time, the "cyclohexene hydration" method has been the mainstream process for the production of cyclohexanol, although it has achieved solid, liquid and liquid three-phase mixing and reaction, but the conversion rate has been hovering between 9-10%, which is difficult to break through. With the surge in market demand, the existing process is facing great challenges: to increase production capacity, the reactor size must be expanded, which not only increases the difficulty of equipment selection, but also significantly increases the manufacturing cost and production operating cost. More seriously, the expansion of the reactor size often leads to a decrease in internal mixing and mass transfer efficiency, directly affecting the reaction rate, residence time and heat removal efficiency, thus sacrificing the high reaction conversion rate, resulting in a general conversion rate of less than 9% for single-line large-capacity reaction equipment. At the same time, the long-term stable operation of large equipment, especially the stirring system, is also under test, ultimately leading to an increase in overall production cost.

[0004] In view of the core position of the reactor in chemical process, its design and optimization are directly related to process efficiency and economic benefit. Therefore, in view of the characteristics of cyclohexene hydration reaction, it is particularly urgent to develop an innovative cross-flow reactor. The reactor aims to optimize the flow field structure, strengthen the mass transfer and reaction process, and significantly improve the conversion rate of cyclohexene hydration reaction. Once the conversion rate is effectively improved, the reactor feed demand will be directly reduced, thus reducing the size of the reactor and the stirring system, reducing the amount of unreacted cyclohexene circulating, and ultimately greatly reducing equipment investment and operating cost. Therefore, the development of cross-flow reactor is not only a manifestation of technological progress, but also a key measure to promote energy saving and emission reduction, cost reduction and efficiency improvement in the chemical industry. SUMMARY

[0005] The utility model aims at providing a kind of external circulation enhanced hydration reactor to solve the problems in the background art.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] The utility model provides a kind of external circulation reinforced hydration reactor, including cylinder, which is provided with stirrer drive motor and standby motor above the cylinder, the stirrer drive motor and standby motor are fixedly connected with stirrer shaft in the output of cylinder, the stirrer shaft is fixedly connected with stirrer blade, one side of the cylinder is equipped with oil phase feed inlet for inputting water and cyclohexene, the oil phase feed inlet is communicated with oil phase distributor inside the cylinder, the other side of the cylinder is equipped with water phase feed inlet for inputting catalyst, the right end of the cylinder is equipped with No.

[0008] Based on the above technical solutions, the utility model further provides the following optional technical solutions:

[0009] In an alternative solution: the external circulation mechanism includes a water phase distributor, the water phase feed inlet is connected to the water phase distributor inside the cylinder, the cylinder is provided with a stirrer blade for mixing, the bottom of the cylinder is provided with a cone, the cone is connected to a water phase outlet, the water phase outlet is connected to the receiving end of an external circulation pump, the output end of the external circulation pump is connected to an external circulation pipeline, and the external circulation pipeline is connected to the water phase feed inlet.

[0010] In an alternative solution: the separation assembly includes a grid, the grid is provided inside the cylinder, the surface of the grid is uniformly provided with a plurality of grid holes, an annular overflow baffle is provided on the grid, the oil phase outlet is provided at the flow guide end of the annular overflow baffle, and the oil phase outlet is connected to a rectification system, which separates cyclohexanol and cyclohexene through the rectification system, and the separated cyclohexene reenters the inside of the cylinder through the oil phase feed inlet.

[0011] In an alternative solution: a branch pipe is provided on the external circulation pipeline for extracting part of the catalyst.

[0012] In an alternative solution: a flushing water inlet for cleaning the grid is provided at the upper end of the cylinder, the flushing water inlet is connected to an internal flushing water spraying ring pipe, an oil phase outlet flushing water inlet for cleaning the oil phase outlet is provided at the side of the flushing water inlet, and the oil phase outlet flushing water inlet is connected to a flushing water pipe.

[0013] In an alternative solution: a manhole is provided on the surface of the cylinder, and a vortex prevention baffle is provided inside the cylinder.

[0014] In an alternative solution: the grid overflows the contact surface of the grid to the mirror surface, and a high-temperature-resistant, acid- and alkali-resistant, and oil-resistant non-stick film is sprayed on the surface of the grid.

[0015] In an alternative, the size of the reactor is such that the oil phase and catalyst have sufficient settling time outside the slurry bottom influence flow field range.

[0016] Compared with the prior art, the utility model has the advantages that:

[0017] 1、The utility model discloses by optimizing phase distribution, the mixing contact area between reactants is increased significantly, which means that more reactant molecules can contact each other and react chemically, thereby improving the reaction efficiency.

[0018] 2、The utility model discloses by adjusting the flow channel structure or operating parameter inside the reactor under the premise of keeping the reactant flow rate appropriate, effectively prolongs the contact reaction residence time between reactants, which makes the reaction more sufficient and is favorable to improve the reaction conversion rate.

[0019] 3、The utility model discloses compared with the traditional internal circulation catalyst system, adopts the external circulation form, and this design simplifies the structure of the stirrer, reduces the shaft power consumption of the stirrer, thereby realizes the compactness and light weight of the structure of the reactor and stirrer.

[0020] 4、The utility model discloses by simplifying the structure and reducing the energy consumption, the manufacturing and operating cost of the reactor is reduced significantly, which has important significance for improving the overall economic benefit of chemical production.

[0021] 5、The utility model discloses by keeping the same production under the premise, realizes the reduction of the reactor feed amount by optimizing the reactor design and operating condition, which not only reduces the consumption of raw materials in the reaction process, but also reduces the burden of subsequent processing procedures.

[0022] 6、The utility model discloses due to the reduction of the feed amount, the equipment and energy consumption required in the oil phase separation and purification process after reaction are also reduced, which helps to reduce the overall production cost and improve the production efficiency, at the same time, the separation is more thorough, and the catalyst carried by the material is less, and the waste produced by the process is less and more environmental protection. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the structural schematic diagram of the utility model.

[0024] Figure label annotations: 1. Flushing water inlet, 2. Oil phase outlet, flushing water inlet, 3. Internal flushing water spray ring pipe, 4. Manhole, 5. Grille, 6. Flushing water pipe, 7. Annular overflow baffle, 8. Oil phase outlet, 9. Grille hole, 10. Water phase inlet, 11. Oil phase inlet, 12. Heating / cooling coil, 13. Agitator blades, 14. Agitator shaft, 15. Anti-vortex baffle, 16. Oil phase distributor, 17. Water phase outlet, 18. Water phase distributor, 19. External circulation pump, 20. Agitator drive motor and standby motor, 21. External circulation pipeline, 22. Coil medium inlet / outlet, 23. Coil medium inlet / outlet, 24. Cylinder, 25. Cone. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] In one embodiment, such as Figure 1 As shown, an external circulation enhanced hydration reactor includes a cylindrical body 24. A stirrer drive motor and a standby motor 20 are mounted above the cylindrical body 24. The stirrer drive motor and standby motor 20 output from inside the cylindrical body 24 and are fixedly connected to a stirrer shaft 14. The stirrer shaft 14 is fixedly connected to stirrer blades 13. One side of the cylindrical body 24 has an oil phase inlet 11 for inputting water and ethylene oxide. The oil phase inlet 11 is connected to an oil phase distributor 16 inside the cylindrical body 24. The other side of the cylindrical body 24 has an aqueous phase inlet 10 for inputting catalyst. A second coil medium inlet / outlet 23 is located at the right end of the cylindrical body 24. The second coil medium inlet / outlet 23 is connected inside the cylindrical body 24 to a heating / cooling coil 12 for removing heat. The heating / cooling coil 12 is connected to the coil medium inlet / outlet 23, which is connected to a heat removal system for cooling. The aqueous phase inlet 10... The external circulation mechanism for circulating catalyst is connected. The cylinder 24 is equipped with a separation component for separating cycloethylene. Water and cycloethylene enter from the oil phase inlet 11 and are distributed in the lower part of the reactor through the oil phase distributor 16. The catalyst enters from the water phase inlet 10 and is distributed in the upper part of the reactor through the water phase distributor 18. Under the action of gravity, the water phase catalyst moves downward and the oil phase cycloethylene moves upward. They are mixed and reacted under the action of the stirrer blades 13. The oil phase of the reaction liquid continues to move upward after reacting in the mass transfer zone. At the same time, the heat released by the reaction is transferred by cooling water from the medium outlet / inlet 23 of the No. 2 coil to the heating / cooling coil 12 and the medium in the reactor. Finally, the heat is carried out by the demineralized water in the coil and discharged from the medium outlet / inlet 23 of the coil to a specific heat removal system for cooling. After cooling, it is recirculated into the coil. This process is repeated. In addition, the coil is also capable of introducing steam during start-up to provide the necessary temperature for the reaction.

[0027] In one embodiment, such as Figure 1 As shown, the external circulation mechanism includes an aqueous phase distributor 18. The aqueous phase inlet 10 is connected to the aqueous phase distributor 18 inside the cylinder 24. The cylinder 24 is equipped with a stirring blade 13 for mixing. The bottom of the cylinder 24 is provided with a cone 25, which is connected to the aqueous phase outlet 17. The aqueous phase outlet 17 is connected to the receiving end of the external circulation pump 19. The output end of the external circulation pump 19 is connected to the external circulation pipeline 21. The external circulation pipeline 21 is connected to the aqueous phase inlet 10. Part of the cycloethylene and water react to generate cycloethanol. While the reaction is taking place, the aqueous phase catalyst continues to move downward, and the oil phase continues to move upward. Finally, the catalyst aqueous phase containing a small amount of oil in the bottom area of ​​the reactor enters the reactor from the aqueous phase outlet 17 through the external circulation pump 19 and the external circulation pipeline 21, thus forming a forced external circulation of the catalyst.

[0028] In one embodiment, such as Figure 1 As shown, the separation component includes a grid 5, which is installed inside the cylinder 24. The grid 5 has a plurality of grid holes 9 evenly distributed on its surface. An annular overflow baffle 7 is provided on the grid 5. An oil phase outlet 8 is provided at the guide end of the annular overflow baffle 7. The oil phase outlet 8 is connected to the distillation system. The distillation system separates cyclic ethanol and cyclic ethylene. The separated cyclic ethylene re-enters the cylinder 24 through the oil phase inlet 11. The oil phase moving upward in the reactor undergoes final oil and water phase separation under the action of the grid 5. Finally, the oil phase cyclic ethylene and cyclic ethanol, which contain almost no aqueous catalyst, flow through the annular overflow baffle 7 to the oil phase outlet 8 area. Finally, they are sent to the downstream distillation system by pressure difference to separate and purify the cyclic ethanol and cyclic ethylene. The separated cyclic ethylene continues to enter the reaction through the oil phase inlet 11. The catalyst circulates outside the reactor. The unreacted cyclic ethylene is separated and purified, and then a portion of new cyclic ethylene is added and sent back to the reactor. The coils in the reactor are cooled by circulating cooling water to remove the reaction heat.

[0029] In one embodiment, such as Figure 1 As shown, the external circulation pipeline 21 is provided with a branch pipe for extracting part of the catalyst. A small portion of the external circulation pipeline 21 can be branched off from the outlet pipeline of the external circulation pump 19 for catalyst regeneration or the addition of new catalyst to maintain the catalyst activity in the reactor, thus achieving the application.

[0030] In one embodiment, such as Figure 1As shown, the upper end of the cylinder 24 is provided with a flushing water inlet 1 for cleaning the grid 5. The flushing water inlet 1 is connected to the internal flushing water spray ring pipe 3. The side of the flushing water inlet 1 is provided with an oil phase outlet flushing water inlet 2 for cleaning the oil phase outlet 8. The oil phase outlet flushing water inlet 2 is connected to the flushing water pipe 6. The flushing is carried out through the flushing water spray ring pipe 3 and the flushing water pipe 6 to prevent blockage.

[0031] In one embodiment, such as Figure 1 As shown, the surface of the cylinder 24 is provided with a manhole 4, and the inside of the cylinder 24 is provided with a turbine baffle 15, which serves to guide the flow.

[0032] The above embodiment discloses an external circulation enhanced hydration reactor, in which water and ethylene cyclohexane enter from the oil phase inlet 11 and are distributed in the lower part of the reactor through the oil phase distributor 16. The catalyst enters from the water phase inlet 10 and is distributed in the upper part of the reactor through the water phase distributor 18. Under the action of gravity, the water phase catalyst moves downward and the oil phase ethylene cyclohexane moves upward. They mix and react under the stirring blades 13. Part of the ethylene cyclohexane and water react to generate cycloethanol. While the reaction is taking place, the water phase catalyst continues to move downward and the oil phase continues to move upward. Finally, the catalyst water phase containing a small amount of oil in the bottom area of ​​the reactor is collected at the water phase outlet 17 by the external circulation pump 19 and enters the reactor from the water phase inlet 10 through the external circulation pipeline 21. This forms a forced external circulation of the catalyst. The oil phase of the reaction liquid continues to move upward after reacting in the mass transfer zone. At the same time, the heat released by the reaction is transferred by cooling water from the medium inlet / outlet 23 of the second coil to the reheating / cooling coil 12 and the medium in the reactor. Finally, the heat is removed by the deheating coil. The brine is carried out and discharged from the coil medium outlet / inlet 23 to a specific heat removal system for cooling. After cooling, it is recirculated back into the coil, and this process is repeated. In addition, the coil can also supply steam during start-up to provide the necessary temperature for the reaction. The oil phase that continuously moves upward in the reactor undergoes final oil-water phase separation under the action of the grid 5. Finally, the oil phase containing almost no aqueous catalyst, cycloethylene and cycloethanol, flows through the annular overflow baffle 7 to the oil phase outlet 8 area. Finally, it is sent to the downstream distillation system by pressure difference to separate and purify cycloethanol and cycloethylene. The separated cycloethylene continues to enter the reaction through the oil phase inlet 11. The catalyst circulates outside the reactor. The unreacted cycloethylene is separated and purified, and some new cycloethylene is added and sent back to the reactor. The coil in the reactor uses cooling water circulation to remove the reaction heat. In addition, a small branch of the external circulation pump 19 and the external circulation pipeline 21 can be used for catalyst regeneration or to add new catalyst to maintain the catalyst activity in the reactor. This is how the application is realized.

[0033] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An external circulation enhanced hydration reactor, comprising a cylindrical body (24), wherein a stirrer drive motor and a standby motor (20) are provided above the cylindrical body (24), the stirrer drive motor and the standby motor (20) are output from the inside of the cylindrical body (24) and fixedly connected to a stirrer shaft (14), the stirrer shaft (14) is fixedly connected to a stirrer blade (13), and an oil phase inlet (11) for inputting water and ethylene oxide is provided on one side of the cylindrical body (24), the oil phase inlet (11) being inside the cylindrical body (24). The cylinder (24) is connected to an oil phase distributor (16), and a water phase inlet (10) for inputting catalyst is provided on the other side of the cylinder (24). A second coil medium inlet / outlet (23) is provided at the right end of the cylinder (24). The second coil medium inlet / outlet (23) is connected inside the cylinder (24) to a heating / cooling coil (12) for removing heat. The heating / cooling coil (12) is connected to the coil medium inlet / outlet (23). The coil medium inlet / outlet (23) is connected to a heat removal system for cooling. The feature is that... The aqueous feed inlet (10) is connected to an external circulation mechanism for circulating the catalyst, and the cylinder (24) is equipped with a separation component for separating cycloethylene.

2. The external circulation enhanced hydration reactor according to claim 1, characterized in that, The external circulation mechanism includes a water phase distributor (18), the water phase inlet (10) is connected to the water phase distributor (18) inside the cylinder (24), the cylinder (24) is provided with agitator blades (13) for mixing, the bottom of the cylinder (24) is provided with a cone (25), the cone (25) is connected to the water phase outlet (17), the water phase outlet (17) is connected to the receiving end of the external circulation pump (19), the output end of the external circulation pump (19) is connected to the external circulation pipeline (21), and the external circulation pipeline (21) is connected to the water phase inlet (10).

3. The external circulation enhanced hydration reactor according to claim 1, characterized in that, The separation component includes a grid (5), and the inside of the cylinder (24) is provided with a grid (5). The surface of the grid (5) is uniformly provided with a plurality of grid holes (9). The grid (5) is provided with an annular overflow baffle (7). The guide end of the annular overflow baffle (7) is provided with an oil phase outlet (8). The oil phase outlet (8) is connected to a distillation system. The distillation system separates cyclic ethanol and cyclic ethylene. The separated cyclic ethylene enters the inside of the cylinder (24) again through the oil phase inlet (11).

4. The external circulation enhanced hydration reactor according to claim 2, characterized in that, The external circulation pipeline (21) is equipped with a branch pipe for extracting part of the catalyst.

5. The external circulation enhanced hydration reactor according to claim 2, characterized in that, The upper end of the cylinder (24) is provided with a flushing water inlet (1) for cleaning the grid (5), the flushing water inlet (1) is connected to the internal flushing water spray ring pipe (3), and the side of the flushing water inlet (1) is provided with an oil phase outlet flushing water inlet (2) for cleaning the oil phase outlet (8), the oil phase outlet flushing water inlet (2) is connected to the flushing water pipe (6).

6. The external circulation enhanced hydration reactor according to claim 1, characterized in that, The surface of the cylinder (24) is provided with a manhole (4), and the inside of the cylinder (24) is provided with a turbine baffle (15).

7. The external circulation enhanced hydration reactor according to claim 3, characterized in that, The roughness of the grid (5) contact surface is 0.2 mirror finish, and the surface of the grid (5) is coated with a non-stick film that is resistant to high temperature, acid and alkali corrosion and oil corrosion.

8. The external circulation enhanced hydration reactor according to claim 2, characterized in that, The cone (25) is sized to allow sufficient settling time for the oil phase and catalyst outside the flow field affected by the bottom slurry.

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