Low solid waste propylene oxide preparation reaction device
Patent Information
- Application Number
- CN202521801359.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-22
- Publication Date
- 2026-08-21
- Estimated Expiration
- 2035-08-22
AI Technical Summary
现有技术中，通常是通过对氢氧化钙粉料进行粉化筛选处理，来提高氢氧化钙含量，但是在将氢氧化钙投入到反应釜中时，大都为一次性投加，极易导致局部过饱和，影响反应吸收效率，鉴于此，针对上述问题深入研究，遂有本案产生
[0010]This invention provides a low-solid-waste propylene oxide preparation reaction apparatus. It offers the following advantages: This low-solid-waste propylene oxide preparation reaction apparatus improves upon existing saponification reactors and calcium hydroxide dosing mechanisms. A ring-shaped spray component is added to the saponification reactor. Chloropropanol is injected into the saponification reactor, and simultaneously, a calcium hydroxide suspension is injected into the reactor through the ring-shaped spray component. Combined with a forced stirring component, this accelerates the contact efficiency between chloropropanol and calcium hydroxide, ensuring that calcium hydroxide is uniformly dispersed in the reaction system. The removal of hydrogen chloride (HCl) promotes the cyclization reaction, generating propylene oxide. A 5%-10% calcium hydroxide suspension is prepared and injected through the ring-shaped spray component, improving its reaction efficiency. To minimize the contact area between the liquid and the reaction system, the calcium hydroxide suspension is added in stages to avoid localized oversaturation caused by a single addition, which would affect the absorption efficiency. Simultaneously, during the addition of reactants, a water bath temperature control system is used to raise the temperature of the reactor and maintain it during the reaction, keeping the reaction temperature between 50-70℃ (the optimal range for calcium hydroxide solubility). This prevents excessively high temperatures from causing calcium hydroxide decomposition and reducing absorption efficiency. Furthermore, the system pH is maintained at 11-12 (the pH of a saturated calcium hydroxide solution is approximately 12.4), ensuring sufficient neutralization of hydrogen chloride and preventing excessive consumption of calcium hydroxide, thereby reducing the amount of solid waste generated during propylene oxide preparation.
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Figure CN224656763U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of propylene oxide preparation technology, specifically to a low-solid-waste propylene oxide preparation reaction device. Background Technology
[0002] Calcium hydroxide (Ca(OH)2) plays a crucial role in the chlorohydrin process for producing propylene oxide (PO). On one hand, it neutralizes chlorohydrins to form epoxides; specifically, calcium hydroxide undergoes a saponification reaction with chloropropanol (such as 1-chloro-2-propanol), and the removal of hydrogen chloride (HCl) promotes the cyclization reaction, resulting in propylene oxide. On the other hand, it regulates the pH of the reaction system; the strong alkalinity of calcium hydroxide (pH≈12.4) maintains the reaction system in an alkaline environment (pH 8-9), inhibiting the hydrolysis of epoxide byproducts. According to the "Guidance Catalogue for Industrial Structure Adjustment (2024 Edition)," the overall requirement is that the waste generated per ton of propylene oxide produced by the chlorohydrin process should not exceed 100 kg. Therefore, increasing the calcium hydroxide content in the raw materials to reduce the amount of solid waste generated in propylene oxide production has become a pressing issue for those skilled in the art. In existing technologies, the calcium hydroxide content is usually increased by pulverizing and screening the calcium hydroxide powder. However, when calcium hydroxide is added to the reactor, it is usually added all at once, which can easily lead to local supersaturation and affect the reaction absorption efficiency. In view of this, this case was developed after in-depth research on the above problems. Utility Model Content
[0003] To address the shortcomings of existing technologies, this invention provides a low-solid-waste propylene oxide preparation reaction apparatus, which solves the problems mentioned in the background art.
[0004] To achieve the above objectives, this utility model is implemented through the following technical solution: a low-solid-waste propylene oxide preparation reaction device, including a saponification reactor, wherein the side wall of the saponification reactor is a jacketed structure and is connected to a water bath temperature control component, a forced stirring component, a temperature probe and a pH sensor are installed inside the saponification reactor, an annular spray component is provided above the inside of the saponification reactor, a suspension preparation mechanism is provided on one side of the saponification reactor, and a liquid supply pump is provided at the outlet end of the suspension preparation mechanism; The suspension preparation mechanism includes a mixing tank, a powder feeding component, an impact stirring component, and a forced circulation component. The powder feeding component is located on the mixing tank, the impact stirring component is located at the bottom of the mixing tank, and the forced circulation component is located on the outside of the mixing tank and is connected to the top and bottom ends of the mixing tank respectively. A water supply pipe is connected to one side of the mixing tank, and an electromagnetic flow valve and an electromagnetic flow meter are installed on the water supply pipe. A drain pipe is inserted into the mixing tank, and the exposed end of the drain pipe is connected to the liquid supply pump.
[0005] The powder feeding assembly includes a powder hopper, a feeding pipe, a servo motor, and a feeding screw. The powder hopper is located above the mixing tank, the feeding pipe is located at the lower end of the powder hopper and inserted into the mixing tank, the servo motor is located above the powder hopper, and one end of the feeding screw is connected to the drive end of the servo motor, while the other end extends into the feeding pipe.
[0006] The aforementioned impact mixing assembly includes a rotary motor, a reducer, a fixed shaft, and a mixing paddle. The input end of the reducer is connected to the drive end of the rotary motor. The fixed shaft is rotatably inserted into the lower end of the mixing tank and connected to the output end of the reducer. The mixing paddle is mounted on the fixed shaft and located inside the mixing tank.
[0007] The aforementioned forced circulation components include a return pipe, a circulation pump, and a backflow pipe. One end of the return pipe is connected to the lower part of the mixing tank, the inlet end of the circulation pump is connected to the return pipe, and one end of the backflow pipe is connected to the inlet end of the circulation pump, while the other end is connected to the top of the mixing tank.
[0008] The aforementioned annular spray component includes an annular pipe, a connecting pipe, and a spray pipe. The annular pipe is fixed inside the saponification reactor and arranged coaxially with the forced stirring assembly. One end of the connecting pipe is connected to the annular pipe, and the other end is connected to the outlet pipe of the liquid supply pump. The spray pipe is arranged in annular array on the lower end of the annular pipe.
[0009] The aforementioned water bath temperature control assembly includes a constant temperature water tank, a water supply pump, a water supply pipe, and a return water pipe. The inlet end of the water supply pump is connected to the outlet end of the constant temperature water tank. One end of the water supply pipe is connected to the jacket structure on the side wall of the saponification reactor, and the other end is connected to the outlet end of the water supply pump. One end of the return water pipe is connected to the jacket structure, and the other end is connected to the inlet of the constant temperature water tank.
[0010] This invention provides a low-solid-waste propylene oxide preparation reaction apparatus. It offers the following advantages: This low-solid-waste propylene oxide preparation reaction apparatus improves upon existing saponification reactors and calcium hydroxide dosing mechanisms. A ring-shaped spray component is added to the saponification reactor. Chloropropanol is injected into the saponification reactor, and simultaneously, a calcium hydroxide suspension is injected into the reactor through the ring-shaped spray component. Combined with a forced stirring component, this accelerates the contact efficiency between chloropropanol and calcium hydroxide, ensuring that calcium hydroxide is uniformly dispersed in the reaction system. The removal of hydrogen chloride (HCl) promotes the cyclization reaction, generating propylene oxide. A 5%-10% calcium hydroxide suspension is prepared and injected through the ring-shaped spray component, improving its reaction efficiency. To minimize the contact area between the liquid and the reaction system, the calcium hydroxide suspension is added in stages to avoid localized oversaturation caused by a single addition, which would affect the absorption efficiency. Simultaneously, during the addition of reactants, a water bath temperature control system is used to raise the temperature of the reactor and maintain it during the reaction, keeping the reaction temperature between 50-70℃ (the optimal range for calcium hydroxide solubility). This prevents excessively high temperatures from causing calcium hydroxide decomposition and reducing absorption efficiency. Furthermore, the system pH is maintained at 11-12 (the pH of a saturated calcium hydroxide solution is approximately 12.4), ensuring sufficient neutralization of hydrogen chloride and preventing excessive consumption of calcium hydroxide, thereby reducing the amount of solid waste generated during propylene oxide preparation. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the main structure of the low-solid-waste propylene oxide preparation reaction device of this utility model.
[0012] Figure 2 This utility model Figure 1 A partially enlarged structural diagram.
[0013] In the diagram: 1. Saponification reactor; 2. Forced stirring assembly; 3. Temperature probe; 4. pH sensor; 5. Liquid supply pump; 6. Mixing tank; 7. Powder hopper; 8. Feed pipe; 9. Servo motor; 10. Feeding screw; 11. Rotary motor; 12. Reducer; 13. Fixed shaft; 14. Stirring paddle; 15. Return pipe; 16. Circulation pump; 17. Backflow pipe; 18. Annular pipe; 19. Connecting pipe; 20. Spray pipe; 21. Constant temperature water tank; 22. Water supply pump; 23. Water supply pipe; 24. Return water pipe. Detailed Implementation
[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0015] Example: Refer to the appendix of the instruction manual Figure 1-2 As can be seen, this application specifically designs a low-solid-waste propylene oxide preparation reaction device, including a saponification reactor 1. The side wall of the saponification reactor 1 has a jacket structure and is connected to a water bath temperature control component. A forced stirring component 2, a temperature probe 3, and a pH sensor 4 are installed inside the saponification reactor 1. An annular spray component is set above the inside of the saponification reactor 1. A suspension preparation mechanism is set on one side of the saponification reactor 1, and a liquid supply pump 5 is set at the outlet end of the suspension preparation mechanism. The suspension preparation mechanism includes a mixing tank 6, a powder feeding component, an impact stirring component, and a... The forced circulation component and powder feeding component are located on the mixing tank 6. The impact stirring component is located at the bottom of the mixing tank 6. The forced circulation component is located on the outside of the mixing tank 6 and is connected to the upper and lower ends of the mixing tank 6 respectively. A water supply pipe is connected to one side of the mixing tank 6. The water supply pipe is equipped with an electromagnetic flow valve and an electromagnetic flow meter. A drain pipe is inserted inside the mixing tank 6. The exposed end of the drain pipe is connected to the liquid supply pump 5. Chloropropanol is injected into the saponification reactor 1. At the same time as the chloropropanol is injected, calcium hydroxide suspension is simultaneously injected into the saponification reactor 1 through the annular spray component. In conjunction with the forced stirring component 2, the contact efficiency between chloropropanol and calcium hydroxide is accelerated, ensuring that calcium hydroxide is uniformly dispersed in the reaction system. The cyclization reaction is promoted by removing hydrogen chloride (HCl) to generate propylene oxide. The calcium hydroxide is prepared into a 5%-10% suspension and injected through the annular spray component to increase the contact area with the reaction liquid. The calcium hydroxide suspension is added to the reaction system in stages to avoid local oversaturation caused by a one-time addition, which would affect the absorption efficiency. At the same time, during the addition of reactants, the reaction vessel is heated by the water bath temperature control component and the temperature is maintained during the reaction process, keeping the reaction temperature at 50-70℃ (the optimal range for calcium hydroxide solubility). In addition, this can prevent the calcium hydroxide from decomposing and reducing the absorption efficiency due to excessive temperature. The pH value of the reaction system is monitored by the pH sensor 4 to control the amount of calcium hydroxide suspension added and maintain the system pH at 11-12 (the pH of a saturated calcium hydroxide solution is approximately 12.4), ensuring that hydrogen chloride is fully neutralized and avoiding excessive consumption of calcium hydroxide, thereby reducing the amount of solid waste generated in the preparation of propylene oxide.
[0016] In the specific implementation process, the above-mentioned powder feeding assembly includes a powder hopper 7, a feeding pipe 8, a servo motor 9, and a feeding screw 10. The powder hopper 7 is located above the mixing tank 6, the feeding pipe 8 is located at the lower end of the powder hopper 7 and inserted into the mixing tank 6, the servo motor 9 is located above the powder hopper 7, and one end of the feeding screw 10 is connected to the drive end of the servo motor 9, and the other end extends into the feeding pipe 8. The impact mixing assembly includes a rotary motor 11, a reducer 12, a fixed shaft 13, and a mixing paddle 14. The input end of the speed reducer 12 is connected to the drive end of the rotary motor 11. The fixed shaft 13 is rotatably inserted into the lower end of the mixing tank 6 and connected to the output end of the speed reducer 12. The stirring paddle 14 is mounted on the fixed shaft 13 and located inside the mixing tank 6. Deionized water is injected into the mixing tank 6 through the water supply pipe, and the injected water volume is monitored using an electromagnetic flow valve and an electromagnetic flow meter. At the same time as water injection, the servo motor 9 above the powder hopper 7 is started, and the servo motor 9 drives the feeding screw 10 to rotate, thereby rotating the powder hopper 7. Pretreated calcium oxide powder is added to mixing tank 6. A servo motor 9, in conjunction with a feeding screw 10, ensures precise control over the amount of calcium oxide added. Simultaneously, the lower rotary motor 11 is activated. The rotary motor 11, in conjunction with a reducer 12, drives the fixed shaft 13 to rotate. A stirring paddle 14 then agitates the mixture, accelerating the reaction between calcium oxide and deionized water to produce a calcium hydroxide suspension. This reaction is initially exothermic; after cooling to room temperature, the forced circulation component is activated to further improve efficiency. The uniformity of the suspension is achieved through a forced circulation assembly consisting of a return pipe 15, a circulation pump 16, and a backflow pipe 17. One end of the return pipe 15 is connected to the lower part of the mixing tank 6, and the inlet end of the circulation pump 16 is connected to the return pipe 15. One end of the backflow pipe 17 is connected to the inlet end of the circulation pump 16, and the other end is connected to the top of the mixing tank 6. By using the circulation pump 16, the suspension in the lower part of the mixing tank 6 is drawn out through the return pipe 15 and further reinjected into the mixing tank 6 through the backflow pipe 17, which can further improve the suspension preparation rate.
[0017] In the specific implementation process, the above-mentioned annular spray component includes an annular pipe 18, a connecting pipe 19, and a spray pipe 20. The annular pipe 18 is fixed in the saponification reactor 1 and arranged coaxially with the forced stirring component 2. One end of the connecting pipe 19 is connected to the annular pipe 18, and the other end is connected to the outlet pipe of the liquid supply pump 5. The spray pipe 20 is arranged in annular array on the lower end of the annular pipe 18. The calcium hydroxide suspension prepared in the mixing tank 6 is drawn out by the liquid supply pump 5 and injected into the annular pipe 18 through the connecting pipe 19. It is further sprayed into the saponification reactor 1 through the spray pipe 20 at the lower part of the annular pipe 18 to react with the hydrogen chloride in the chloropropanol. The injection through the annular spray component can effectively increase the contact area with the reaction liquid. The calcium hydroxide suspension is added to the reaction system in stages to avoid local oversaturation caused by one-time addition, which would affect the absorption efficiency.
[0018] In the specific implementation process, the above-mentioned water bath temperature control component includes a constant temperature water tank 21, a water supply pump 22, a water supply pipe 23, and a return water pipe 24. The inlet end of the water supply pump 22 is connected to the outlet end of the constant temperature water tank 21. One end of the water supply pipe 23 is connected to the side wall jacket structure of the saponification reactor 1, and the other end is connected to the outlet end of the water supply pump 22. One end of the return water pipe 24 is connected to the jacket structure, and the other end is connected to the inlet of the constant temperature water tank 21. The high temperature water in the constant temperature water tank 21 is used as the heat medium. The high temperature water is injected into the side wall jacket structure of the saponification reactor 1 through the water supply pipe 23 by the water supply pump 22. Heat is exchanged with the reaction liquid in the saponification reactor 1. The temperature of the reaction liquid is monitored by the temperature probe 3, and the water temperature in the constant temperature water tank 21 is adjusted in real time to maintain the reaction temperature at 50-70℃ (the optimal range for calcium hydroxide solubility).
[0019] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A low-solid-waste propylene oxide preparation reaction apparatus, comprising a saponification reactor, characterized in that, The side wall of the saponification reactor is a jacketed structure and is connected to the water bath temperature control component. The saponification reactor is equipped with a forced stirring component, a temperature probe and a pH sensor. An annular spray component is set above the inside of the saponification reactor. A suspension preparation mechanism is set on one side of the saponification reactor. A liquid supply pump is set at the outlet end of the suspension preparation mechanism. The suspension preparation mechanism includes a mixing tank, a powder feeding component, an impact stirring component, and a forced circulation component. The powder feeding component is located on the mixing tank, the impact stirring component is located at the bottom of the mixing tank, and the forced circulation component is located on the outside of the mixing tank and is connected to the top and bottom ends of the mixing tank respectively. A water supply pipe is connected to one side of the mixing tank, and an electromagnetic flow valve and an electromagnetic flow meter are installed on the water supply pipe. A drain pipe is inserted into the mixing tank, and the exposed end of the drain pipe is connected to the liquid supply pump.
2. The low-solid-waste propylene oxide preparation reaction apparatus according to claim 1, characterized in that, The powder feeding assembly includes a powder hopper, a feeding pipe, a servo motor, and a feeding screw. The powder hopper is located above the mixing tank, the feeding pipe is located at the lower end of the powder hopper and inserted into the mixing tank, the servo motor is located above the powder hopper, and one end of the feeding screw is connected to the drive end of the servo motor, while the other end extends into the feeding pipe.
3. The low-solid-waste propylene oxide preparation reaction apparatus according to claim 1, characterized in that, The impact mixing assembly includes a rotary motor, a reducer, a fixed shaft, and a mixing paddle. The input end of the reducer is connected to the drive end of the rotary motor. The fixed shaft is rotatably inserted into the lower end of the mixing tank and connected to the output end of the reducer. The mixing paddle is mounted on the fixed shaft and located inside the mixing tank.
4. The low-solid-waste propylene oxide preparation reaction apparatus according to claim 1, characterized in that, The forced circulation assembly includes a return pipe, a circulation pump, and a backflow pipe. One end of the return pipe is connected to the lower part of the mixing tank, the inlet end of the circulation pump is connected to the return pipe, and one end of the backflow pipe is connected to the inlet end of the circulation pump, while the other end is connected to the top of the mixing tank.
5. The low-solid-waste propylene oxide preparation reaction apparatus according to claim 1, characterized in that, The annular spray component includes an annular pipe, a connecting pipe, and a spray pipe. The annular pipe is fixed inside the saponification reactor and arranged coaxially with the forced stirring assembly. One end of the connecting pipe is connected to the annular pipe, and the other end is connected to the outlet pipe of the liquid supply pump. The spray pipe is arranged in annular array on the lower end of the annular pipe.
6. The low-solid-waste propylene oxide preparation reaction apparatus according to claim 1, characterized in that, The water bath temperature control assembly includes a constant temperature water tank, a water supply pump, a water supply pipe, and a return water pipe. The inlet end of the water supply pump is connected to the outlet end of the constant temperature water tank. One end of the water supply pipe is connected to the jacket structure on the side wall of the saponification reactor, and the other end is connected to the outlet end of the water supply pump. One end of the return water pipe is connected to the jacket structure, and the other end is connected to the inlet of the constant temperature water tank.