Continuous catalytic reaction device for liquid-phase catalyst
By designing a continuous catalytic reaction device for liquid phase catalysts, the continuous addition of high-active catalysts and the continuous production of low-active catalysts are achieved, which solves the problem of unstable hydrogenation reaction caused by the reduction of catalyst activity, improves the reaction stability and optimizes the operation.
Patent Information
- Application Number
- CN202421820752.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-30
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-07-30
AI Technical Summary
During the production process of polyurethane, the reduction of the activity of the catalyst leads to unstable hydrogenation reaction, and the existing batch batch operation results in the small and discontinuous amount of catalyst addition and production, affecting the stability of the reaction.
A liquid phase catalyst continuous catalytic reaction device is designed, including a high-active catalyst feed tank, a reactor, a catalyst addition metering pump and a catalyst production metering pump. The continuous addition of high-active catalyst and the continuous extraction of low-active catalyst are achieved through the catalyst supply pipeline and production pipeline, and the stability of the catalyst content in the reactor is controlled.
By continuously controlling the addition and production of catalysts, the stability of the catalyst content in the reactor is improved, the stability of the hydrogenation reaction is improved, the labor intensity is reduced and the operation process is optimized.
Smart Images
Figure CN222855451U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of polyurethane production, and specifically relates to a liquid phase catalyst continuous catalytic reaction device. Background Art
[0002] Polyurethane is a polymer material formed by the polymerization of isocyanate and polyol. It has excellent thermodynamic properties and is widely used in furniture, automotive interiors, aerospace and other fields. Polyurethane foam is a foaming material with a cross-linked structure. It is often used in daily necessities such as sofas, mattresses, pillows, and is also the most widely used polyurethane material. In the production process of the polyurethane TDI industry, catalysts are used to promote the hydrogenation reaction. During the use of the catalyst, the catalytic activity continues to decrease. Therefore, in the production process, in order to avoid affecting the production of polyurethane, it is generally necessary to remove the low-activity catalyst and inject a high-activity catalyst. Intermittent batch operation is generally used. According to the time interval, the high-activity catalyst is added and the low-activity catalyst is removed. The amount of catalyst added and removed is relatively small, and this operation mode will cause fluctuations in the hydrogenation reaction, affecting the stability of the hydrogenation reaction. Utility Model Content
[0003] The utility model aims to provide a liquid phase catalyst continuous catalytic reaction device, aiming to solve the problem that the extraction and addition of catalyst in the hydrogenation reaction process leads to fluctuations in the hydrogenation reaction.
[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a liquid-phase catalyst continuous catalytic reaction device, including a high-activity catalyst feed tank, a reactor, a catalyst addition metering pump and a catalyst extraction metering pump, a catalyst feed pipeline is connected between the high-activity catalyst feed tank and the reactor, the catalyst addition metering pump is arranged on the catalyst feed pipeline, and is used to control the addition amount of the high-activity catalyst, the reactor is provided with a discharge pipeline, the discharge pipeline is provided with a catalyst extraction pipeline, the catalyst extraction metering pump is arranged on the catalyst extraction pipeline, and is used to control the extraction amount of the material containing the low-activity catalyst, and the other end of the catalyst extraction pipeline is connected to the low-activity catalyst storage tank.
[0005] In a possible implementation, a back-pressure valve is provided on the catalyst production pipeline, and the back-pressure valve is provided on a side of the catalyst production metering pump away from the reactor.
[0006] In a possible implementation, the outlet of the catalyst supply line is disposed in the middle of the side wall of the reactor.
[0007] In a possible implementation, a catalyst slurry filter is provided at one end of the discharge pipeline away from the reactor.
[0008] In a possible implementation, a filter feed pump is provided at one end of the discharge pipeline close to the catalyst slurry filter.
[0009] In a possible implementation, the catalyst slurry filter is provided with a filtrate discharge pipeline and a catalyst slurry extraction pipeline.
[0010] In a possible implementation, the other end of the catalyst slurry extraction pipeline is connected to the reactor.
[0011] In a possible implementation, a catalyst slurry discharge pipeline is provided on the catalyst slurry production pipeline, and the catalyst slurry discharge pipeline is connected to the low-activity catalyst storage tank.
[0012] In a possible implementation, a shut-off valve is provided on the catalyst slurry discharge pipeline.
[0013] In a possible implementation, a control valve is provided on the discharge pipeline.
[0014] The beneficial effects of a liquid phase catalyst continuous catalytic reaction device provided by the utility model are:
[0015] Compared with the prior art, the invention is provided with a high-activity catalyst feed trough, a reactor, a catalyst addition metering pump and a catalyst extraction metering pump. The high-activity catalyst is stored in the high-activity catalyst feed trough. The catalyst feed pipeline connects the high-activity catalyst feed trough and the reactor, and the high-activity catalyst is injected into the reactor. The chemical agent feed pipeline is provided with a catalyst addition metering pump for controlling the amount of high-activity catalyst added. The reactor is provided with a discharge pipeline, and a catalyst extraction pipeline is provided on the discharge pipeline. The catalyst extraction pipeline extracts a certain amount of material containing low-activity catalyst from the discharge pipeline. The catalyst extraction pipeline is provided with a catalyst extraction metering pump for controlling the extraction amount of the material containing low-activity catalyst, so as to realize continuous addition of high-activity catalyst and continuous extraction of low-activity catalyst. By controlling the flow rates of the catalyst addition metering pump and the catalyst extraction metering pump, the stability of the catalyst content in the reactor is improved, the stability of the hydrogenation reaction is improved, the labor intensity is reduced, and the operation is optimized. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0017] Figure 1 This is a schematic structural diagram of a liquid phase catalyst continuous catalytic reaction device provided in an embodiment of the utility model.
[0018] In the figure: 1. High-activity catalyst feed tank; 2. Reactor; 3. Catalyst addition metering pump; 4. Catalyst extraction metering pump; 5. Catalyst feed pipeline; 6. Discharge pipeline; 7. Catalyst extraction pipeline; 8. Low-activity catalyst storage tank; 9. Back pressure valve; 10. Catalyst slurry filter; 11. Filter feed pump; 12. Filtrate discharge pipeline; 13. Catalyst slurry extraction pipeline; 14. Product receiving tank; 15. Catalyst slurry discharge pipeline; 16. Shut-off valve; 17. Control valve. DETAILED DESCRIPTION
[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0020] Please refer to Figure 1 A specific embodiment of a liquid-phase catalyst continuous catalytic reaction device provided by the utility model is now described, comprising a high-activity catalyst feed tank 1, a reactor 2, a catalyst addition metering pump 3 and a catalyst extraction metering pump 4, a catalyst feed pipeline 5 is connected between the high-activity catalyst feed tank 1 and the reactor 2, the catalyst addition metering pump 3 is arranged on the catalyst feed pipeline 5, and is used to control the addition amount of the high-activity catalyst, a discharge pipeline 6 is arranged on the reactor 2, a catalyst extraction pipeline 7 is arranged on the discharge pipeline 6, the catalyst extraction metering pump 4 is arranged on the catalyst extraction pipeline 7, and is used to control the extraction amount of the material containing the low-activity catalyst. The other end of the catalyst extraction pipeline 7 is connected to a low-activity catalyst storage tank 8.
[0021] The utility model provides a liquid-phase catalyst continuous catalytic reaction device. Compared with the prior art, the utility model is provided with a high-activity catalyst feeding tank 1, a reactor 2, a catalyst adding metering pump 3 and a catalyst extraction metering pump 4. The high-activity catalyst is stored in the high-activity catalyst feeding tank 1, a catalyst feeding pipeline 5 connects the high-activity catalyst feeding tank 1 and the reactor 2, and the high-activity catalyst is injected into the reactor 2. The catalyst adding metering pump 3 for controlling the amount of high-activity catalyst added is arranged on the chemical agent feeding pipeline, and the reactor 2 is provided with a discharge pipeline 6. The discharge pipe 5 is connected to the high-activity catalyst feeding tank 1 and the reactor 2. The high-activity catalyst is injected into the reactor 2. A catalyst extraction pipeline 7 is provided on line 6, and the catalyst extraction pipeline 7 extracts a certain amount of material containing low-activity catalyst from the discharge pipeline 6. A catalyst extraction metering pump 4 is provided on the catalyst extraction pipeline 7 for controlling the extraction amount of the material containing low-activity catalyst, thereby realizing continuous addition of high-activity catalyst and continuous extraction of low-activity catalyst. By controlling the flow rates of the catalyst addition metering pump 3 and the catalyst extraction metering pump 4, the stability of the catalyst content in the reactor 2 is improved, the stability of the hydrogenation reaction is improved, the labor intensity is reduced, and the operation is optimized.
[0022] For details, please refer to Figure 1 , comprising a high-activity catalyst feed tank 1, a reactor 2, a catalyst addition metering pump 3 and a catalyst extraction metering pump 4, wherein the high-activity catalyst feed tank 1 stores a high-activity catalyst, a catalyst feed pipeline 5 is arranged at the lower end of the high-activity catalyst feed tank 1, the catalyst addition metering pump 3 is arranged on the catalyst feed pipeline 5, the catalyst addition metering pump 3 is a diaphragm metering pump, which increases the accuracy of flow control of the high-activity catalyst flowing into the reactor 2, a discharge pipeline 6 is arranged at the lower end of the reactor 2, which is convenient for discharging the materials in the reactor 2 after the reaction is completed, and a catalyst extraction pipeline 7 is arranged on the discharge pipeline 6, which is used to extract the catalyst containing low-activity catalyst during the reaction in the reactor 2. The catalyst extraction metering pump 4 is arranged on the catalyst extraction pipeline 7. The catalyst extraction metering pump 4 is a diaphragm metering pump, which increases the accuracy of flow control of the material containing low-activity catalyst extracted from the reactor 2. The end of the catalyst extraction pipeline 7 away from the discharge pipeline 6 is connected to a low-activity catalyst storage tank 8. The low-activity catalyst storage tank 8 is used to store the discharged material containing low-activity catalyst. During the reaction in the reactor 2, the flow rates of the catalyst addition metering pump 3 and the catalyst extraction metering pump 4 are controlled to achieve the stability of the total material amount in the reactor 2, improve the stability of the catalyst content in the reactor 2, improve the stability of the hydrogenation reaction, reduce labor intensity, and optimize operation.
[0023] As a specific implementation of a liquid phase catalyst continuous catalytic reaction device provided by the utility model, please refer to Figure 1 A back pressure valve 9 is provided on the catalyst extraction pipeline 7 , and the back pressure valve 9 is arranged on the side of the catalyst extraction metering pump 4 away from the reaction kettle 2 .
[0024] For details, please refer to Figure 1 The back pressure valve 9 is arranged on the catalyst extraction pipeline 7 and on one side of the discharge port of the catalyst extraction metering pump 4, so as to facilitate the extraction of materials from the high-pressure reactor 2 and improve the accuracy of flow control.
[0025] As a specific implementation of a liquid phase catalyst continuous catalytic reaction device provided by the utility model, please refer to Figure 1 The discharge port of the catalyst feeding pipeline 5 is arranged in the middle of the side wall of the reaction kettle 2 .
[0026] For details, please refer to Figure 1 The discharge port of the catalyst feeding pipeline 5 is arranged on the side wall of the reactor 2 and in the middle of the side wall of the reactor 2, so as to improve the uniformity of diffusion of the high-activity catalyst in the reactor 2.
[0027] As a specific implementation of a liquid phase catalyst continuous catalytic reaction device provided by the utility model, please refer to Figure 1 A catalyst slurry filter 10 is provided at one end of the discharge pipeline 6 away from the reactor 2 .
[0028] For details, please refer to Figure 1 A catalyst slurry filter 10 is arranged on the discharge pipeline 6, the discharge port of the discharge pipeline 6 is arranged at the lower end of the catalyst slurry filter 10, and the feed inlet of the catalyst extraction pipeline 7 is arranged between the reactor 2 and the catalyst slurry filter 10. The material after the reaction is discharged into the catalyst slurry filter 10 through the discharge pipeline 6, and the catalyst slurry filter 10 filters the catalyst in the material.
[0029] As a specific implementation of a liquid phase catalyst continuous catalytic reaction device provided by the utility model, please refer to Figure 1 A filter feed pump 11 is provided at one end of the discharge pipeline 6 close to the catalyst slurry filter 10 .
[0030] For details, please refer to Figure 1 The filter feed pump 11 is arranged on the discharge pipeline 6, and the filter feed pump 11 pumps the material in the reactor 2 into the catalyst slurry filter 10 to increase the flow rate of the material.
[0031] As a specific implementation of a liquid phase catalyst continuous catalytic reaction device provided by the utility model, please refer to Figure 1 The catalyst slurry filter 10 is provided with a filtrate discharge pipeline 12 and a catalyst slurry extraction pipeline 13 .
[0032] For details, please refer to Figure 1The filtrate discharge pipeline 12 is arranged in the middle of the side wall of the catalyst slurry filter 10, which is convenient for discharging the filtrate after removing the catalyst. The other end of the filtrate discharge pipeline 12 is connected to the product receiving tank 14 for storing the filtrate. The catalyst slurry extraction pipeline 13 is arranged at the upper end of the catalyst slurry filter 10, which is used for extracting the catalyst filtered out of the catalyst slurry filter 10.
[0033] As a specific implementation of a liquid phase catalyst continuous catalytic reaction device provided by the utility model, please refer to Figure 1 The other end of the catalyst slurry extraction pipeline 13 is connected to the reaction kettle 2.
[0034] For details, please refer to Figure 1 The catalyst slurry extraction pipeline 13 connects the catalyst slurry filter 10 and the reactor 2. The outlet of the catalyst slurry extraction pipe is arranged in the middle of the side wall of the reactor 2. The filtered catalyst can be discharged back into the reactor 2 to realize the reuse of the catalyst.
[0035] As a specific implementation of a liquid phase catalyst continuous catalytic reaction device provided by the utility model, please refer to Figure 1 A catalyst slurry discharge pipeline 15 is provided on the catalyst slurry extraction pipeline 13 , and the catalyst slurry discharge pipeline 15 is connected to the low-activity catalyst storage tank 8 .
[0036] For details, please refer to Figure 1 The catalyst slurry discharge pipeline 15 is arranged on the catalyst slurry extraction pipeline 13, and the other end of the catalyst slurry discharge pipeline 15 is connected to the low-activity catalyst storage tank 8, so as to discharge the filtered catalyst into the low-activity catalyst storage tank 8, collect it, and continue the subsequent operation.
[0037] As a specific implementation of a liquid phase catalyst continuous catalytic reaction device provided by the utility model, please refer to Figure 1 A shut-off valve 16 is provided on the catalyst slurry discharge pipeline 15 .
[0038] For details, please refer to Figure 1 A cut-off valve 16 is provided on the catalyst slurry discharge pipeline 15 to facilitate controlling the flow of the filtered catalyst.
[0039] As a specific implementation of a liquid phase catalyst continuous catalytic reaction device provided by the utility model, please refer to Figure 1 A control valve 17 is provided on the discharge pipeline 6.
[0040] For details, please refer to Figure 1 A control valve 17 is provided on the discharge pipeline 6 to facilitate controlling the flow of materials in the reactor 2.
[0041] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A liquid-phase catalyst continuous catalytic reaction device, characterized in that: It includes a high-activity catalyst feed tank, a reactor, a catalyst addition metering pump and a catalyst extraction metering pump. A catalyst feed pipeline is connected between the high-activity catalyst feed tank and the reactor. The catalyst addition metering pump is arranged on the catalyst feed pipeline to control the addition amount of the high-activity catalyst. The reactor is provided with a discharge pipeline, and a catalyst extraction pipeline is arranged on the discharge pipeline. The catalyst extraction metering pump is arranged on the catalyst extraction pipeline to control the extraction amount of materials containing low-activity catalyst. The other end of the catalyst extraction pipeline is connected to a low-activity catalyst storage tank.
2. A liquid-phase catalyst continuous catalytic reaction device according to claim 1, characterized in that: The catalyst extraction pipeline is provided with a back-pressure valve, and the back-pressure valve is arranged on a side of the catalyst extraction metering pump away from the reactor.
3. A liquid-phase catalyst continuous catalytic reaction device according to claim 1, characterized in that: The discharge port of the catalyst feeding pipeline is arranged in the middle of the side wall of the reactor.
4. A liquid-phase catalyst continuous catalytic reaction device according to claim 1, characterized in that: A catalyst slurry filter is provided at one end of the discharge pipeline away from the reactor.
5. A liquid-phase catalyst continuous catalytic reaction device as claimed in claim 4, characterized in that: A filter feed pump is provided at one end of the discharge pipeline close to the catalyst slurry filter.
6. A liquid-phase catalyst continuous catalytic reaction device according to claim 5, characterized in that: The catalyst slurry filter is provided with a filtrate discharge pipeline and a catalyst slurry extraction pipeline.
7. A liquid-phase catalyst continuous catalytic reaction device according to claim 6, characterized in that: The other end of the catalyst slurry extraction pipeline is connected to the reactor.
8. A liquid-phase catalyst continuous catalytic reaction device according to claim 6, characterized in that: The catalyst slurry extraction pipeline is provided with a catalyst slurry discharge pipeline, and the catalyst slurry discharge pipeline is connected to the low-activity catalyst storage tank.
9. A liquid-phase catalyst continuous catalytic reaction device according to claim 8, characterized in that: A shut-off valve is provided on the catalyst slurry discharge pipeline.
10. The liquid-phase catalyst continuous catalytic reaction device according to claim 1, characterized in that: A control valve is provided on the discharge pipeline.