Fluidized bed device for hydro-thermal treatment of pyridine catalyst
By designing a fluidized bed device for pyridine catalysts and optimizing the hydrothermal treatment process of the catalysts, the problem of long evaluation cycles in existing devices was solved, enabling rapid and accurate catalyst stability evaluation, improving utilization and reducing production costs.
Patent Information
- Application Number
- CN202423014348.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-07
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-12-07
AI Technical Summary
Existing catalyst stability evaluation devices have long evaluation cycles and low utilization rates, which affect production capacity and costs.
Design a fluidized bed device for hydrothermal treatment of pyridine catalyst, comprising a gas feed system, a liquid feed system, and a reaction system, equipped with an air compressor, a mass flow meter, a deionized water storage tank, a feed pump, a reaction tube, an electric furnace heater, a membrane tube, and a distribution plate to achieve automatic control and optimize the hydrothermal treatment process of the catalyst.
It shortens the catalyst stability evaluation cycle, improves catalyst utilization, achieves rapid and accurate catalyst stability evaluation, and saves production costs.
Smart Images
Figure CN223602488U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of catalyst hydrothermal treatment, especially relates to a fluidized bed device for pyridine catalyst hydrothermal treatment. BACKGROUND
[0002] The process of formaldehyde acetaldehyde and ammonia gas acetaldehyde condensation reaction to generate pyridine base, the industrial fluidized bed reactor is used to carry out the evaluation reaction of catalyst activity, selectivity and pyridine base yield. But the catalyst life of the reaction is short, the yield of pyridine will rapidly decrease after several hours of evaluation reaction, and the catalyst needs to be regenerated constantly to restore the catalytic performance, which restricts the production capacity to some extent. In order to save production cost, it is necessary to select a pyridine catalyst with good stability. The selection of catalyst cannot be separated from the evaluation device, and the existing catalyst stability evaluation device has the problems of long evaluation period and low utilization rate.
[0003] Therefore, it is necessary to provide an improvement to overcome the defects of the prior art. SUMMARY
[0004] The utility model discloses a fluidized bed device for pyridine catalyst hydrothermal treatment, which solves the problem of long evaluation period of the existing device.
[0005] The technical scheme of the utility model is:
[0006] A fluidized bed device for pyridine catalyst hydrothermal treatment, comprising a gas feeding system, a liquid feeding system and a reaction system, the gas feeding system and the liquid feeding system are connected with the reaction system; the gas feeding system comprises an air compressor and a mass flow meter, the air compressor is connected with the gas inlet end of the mass flow meter, the liquid feeding system comprises a deionized water storage tank and a feeding pump, the deionized water storage tank is connected with the feeding end of the feeding pump, the reaction system comprises a reaction tube, an electric furnace heater, a membrane tube and a distribution plate, the reaction tube is arranged in the electric furnace heater, the membrane tube is arranged at the upper end of the reaction tube, the distribution plate is arranged at the lower end of the reaction tube, the discharge end of the feeding pump is connected with the electric furnace heater, the gas outlet end of the mass flow meter is connected with the gas inlet end of the distribution plate, and the gas outlet end of the membrane tube is connected with a storage tank.
[0007] As a preferred technical scheme, the reaction tube is provided with a catalyst feeding port, and the electric furnace heater is provided with a catalyst unloading port.
[0008] As a preferred technical scheme, the electric furnace heater is provided with a heat tracing feeding pipe, the heat tracing feeding pipe is a stainless steel pipe wrapped with a heat tracing belt, and the feeding pump is connected with the heat tracing feeding pipe.
[0009] As a preferred technical scheme, a condenser is arranged on the connecting pipe between the membrane tube and the storage tank.
[0010] As a preferred technical solution, a gas preheater is provided on the connecting pipe between the mass flow meter and the distribution plate.
[0011] As a preferred technical solution, the electric furnace heater is equipped with a temperature sensor.
[0012] As a preferred technical solution, it also includes an automatic control system, wherein all electrical components of the fluidized bed device for hydrothermal treatment of pyridine catalyst are connected to the automatic control system.
[0013] Compared with the prior art, the beneficial effects of this utility model are:
[0014] This invention relates to a fluidized bed device for hydrothermal treatment of pyridine catalysts. By setting up a gas feed system, a liquid feed system, and a reaction system, the gas feed system includes an air compressor and a mass flow meter, the liquid feed system includes a deionized water storage tank and a feed pump, and the reaction system includes a reaction tube, an electric furnace heater, a membrane tube, and a distribution plate. This invention solves the problem of hydrothermal stability treatment of pyridine catalysts, shortens the evaluation cycle of the catalyst stability evaluation device, improves the utilization rate, and achieves rapid and accurate determination of catalyst stability. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the connection of the fluidized bed device for hydrothermal treatment of pyridine catalyst according to this utility model.
[0016] In the diagram: 1. Deionized water storage tank; 2. Feed pump; 3. Feed pipe with heat tracing; 4. Catalyst inlet; 5. Catalyst outlet; 6. Membrane tube; 7. Distribution plate; 8. Reaction tube; 9. Electric furnace heater; 10. Gas preheater; 11. Mass flow meter; 12. Condenser; 13. Storage tank. Detailed Implementation
[0017] To make the technical means, technical features, utility model purpose and technical effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations.
[0018] like Figure 1 The diagram shown is a connection schematic of the fluidized bed device for hydrothermal treatment of pyridine catalyst according to this invention.
[0019] The fluidized bed device for hydrothermal treatment of pyridine catalyst in this embodiment includes a gas feed system, a liquid feed system, a reaction system, and an automatic control system. Both the gas feed system and the liquid feed system are connected to the reaction system. The automatic control system is connected to the electrical components within the fluidized bed device and is used to control the automatic operation of the entire device.
[0020] The gas feeding system comprises an air compressor and a mass flow meter 11, the outlet of the air compressor is connected with the inlet of the mass flow meter 11, the air compressor provides compressed air to the mass flow meter 11, the mass flow meter 11 is used for controlling the flow of the compressed air, the outlet of the mass flow meter 11 is connected with the gas preheater 10 through a connecting pipe, the preheater 10 is connected with the reaction system, the compressed air is heated through the gas preheater 10 to form high-temperature gas into the reaction system.
[0021] The liquid feeding system comprises a deionized water tank 1 and a feeding pump 2, the outlet of the deionized water tank 1 is connected with the inlet of the feeding pump 2, the outlet of the feeding pump 2 is connected with a heat tracing feeding pipe 3, the heat tracing feeding pipe 3 is connected with the reaction system, the heat tracing feeding pipe 3 is a stainless steel pipe with a heat tracing belt on the outer surface, the deionized water is transported to the heat tracing feeding pipe 3 through the feeding pump 2, and is heated and vaporized into the reaction system through the heat tracing feeding pipe 3.
[0022] The reaction system comprises a reaction tube 8, an electric furnace heater 9, a membrane tube 6 and a distribution plate 7, the reaction tube 8 is installed in the electric furnace heater 9, the lower end of the reaction tube 8 is communicated with the electric furnace heater 9, the membrane tube 6 is installed at the upper end of the reaction tube 8, the distribution plate 7 is installed at the lower end of the reaction tube 8, the membrane tube 6 and the distribution plate 7 are communicated with the reaction tube 8, the outlet of the membrane tube 6 is connected with a storage tank 13, a condenser 12 is installed on the connecting pipe between the membrane tube 6 and the storage tank 13, a water outlet is formed on the storage tank 13, in the process that the vaporized water vapor in the reaction tube 8 is output to the storage tank 13 through the membrane tube 6, the vaporized water vapor is liquefied through the condenser 12 and is stored in the storage tank 13.
[0023] The distribution plate 7 is installed at the lower end of the reaction tube 8, the outlet of the gas preheater 10 is connected with the gas inlet of the distribution plate 7, the lower end of the side of the electric furnace heater 9 is provided with a water inlet and a catalyst discharge port 5, the heat tracing feeding pipe 3 is installed at the water inlet of the electric furnace heater 9, and the upper end of the reaction tube 8 is provided with a catalyst feeding port 4.
[0024] The connecting pipes of the components of the device are all provided with pressure detectors and safety valves, which are used for monitoring the operation parameters of the components in the device and facilitating the automatic control of the automatic control system on the components.
[0025] Working principle:
[0026] Example 1:
[0027] The pyridine catalyst A was charged into the reaction tube 8 of the fluid bed through the catalyst feeding port 4, the temperature of the reaction tube was 800 ℃, the air with a flow rate of 2 L / min was preheated by the gas preheater 10 and then entered into the reaction tube 8 from below the distribution plate 7, and the deionized water with a flow rate of 8 mL / min was pumped into the heat tracing feeding pipe 3 through the feeding pump 2 and then entered into the reaction tube 8 from above the distribution plate 7 after vaporization. The water vapor entered into the fluid bed to contact the catalyst, and the water feeding was stopped after 10 h, the air blowing was stopped after 10 min, and the catalyst was unloaded after cooling.
[0028] The hydrothermally treated catalyst A was charged into the pyridine catalyst evaluation device to perform the formaldehyde acetaldehyde aldehyde ammonia condensation reaction, the reaction temperature was 450 ℃, the product content was analyzed by gas chromatography by sampling once per hour, and the yield was calculated by recording the raw material and discharge weight.
[0029] Example 2:
[0030] The water feeding time was 20 h, and the remaining steps and conditions were according to Example 1.
[0031] Example 3:
[0032] The water feeding time was 30 h, and the remaining steps and conditions were according to Example 1.
[0033] Example 4:
[0034] The water feeding time was 40 h, and the remaining steps and conditions were according to Example 1.
[0035] Example 5:
[0036] The water feeding time was 50 h, and the remaining steps and conditions were according to Example 1.
[0037] Example 6:
[0038] The water feeding time was 60 h, and the remaining steps and conditions were according to Example 1.
[0039] Comparative Example 1:
[0040] The pyridine catalyst A was not treated with water, and the performance evaluation of the pyridine catalyst A was performed according to the evaluation steps and conditions of Example 1.
[0041] According to the above examples and comparative examples, the data in Table 1 were obtained:
[0042] Table 1 Performance comparison of Examples 1-6 and Comparative Example 1
[0043] Number Water passage time (h) Yield of pyridine base (%) Example 1 10 77.8 Example 2 20 77.5 Example 3 30 77.1 Example 4 40 75.2 Example 5 50 73.3 Example 6 60 71.2 Comparative Example 1 - 78
[0044] As can be seen from Table 1, with the increase of water passing time, the yield of pyridine base will decrease, especially the yield decreases more obviously when the water passing time is more than 30 hours. If the yield of pyridine base does not decrease obviously when the catalyst is hydrothermally treated for 30 hours, it indicates that the catalyst has better hydrothermal stability; if the yield of pyridine base decreases obviously when the catalyst is hydrothermally treated for less than 30 hours, the catalyst has poorer hydrothermal stability; if the yield of pyridine base does not decrease obviously when the catalyst is hydrothermally treated for 60 hours, it indicates that the catalyst has very good hydrothermal temperature resistance. Therefore, this can be used as a standard to screen the catalyst, the hydrothermal treatment method is used to simulate the production conditions to quickly evaluate the stability of the catalyst, shorten the time for screening the catalyst, and save the production cost.
[0045] The above is only the preferred embodiment of the present application, and is not intended to limit the scope of the present application. Any equivalent changes and modifications made in accordance with the content of the present application should be within the technical scope of the present application.
Claims
1. A fluidized bed apparatus for hydrothermal treatment of pyridine catalyst, characterized by, The device comprises a gas feeding system, a liquid feeding system and a reaction system, the gas feeding system and the liquid feeding system are connected with the reaction system; the gas feeding system comprises an air compressor and a mass flow meter (11), the air compressor is connected with the gas inlet end of the mass flow meter (11), the liquid feeding system comprises a deionized water storage tank (1) and a feeding pump (2), the deionized water storage tank (1) is connected with the feeding end of the feeding pump (2), the reaction system comprises a reaction tube (8), an electric furnace heater (9), a membrane tube (6) and a distribution plate (7), the reaction tube (8) is arranged in the electric furnace heater (9), the membrane tube (6) is arranged at the upper end of the reaction tube (8), the distribution plate (7) is arranged at the lower end of the reaction tube (8), the discharge end of the feeding pump (2) is connected with the electric furnace heater (9), the gas outlet end of the mass flow meter (11) is connected with the gas inlet end of the distribution plate (7), and the gas outlet end of the membrane tube (6) is connected with a storage tank (13).
2. The fluidized bed apparatus for hydrothermal treatment of pyridine catalyst according to claim 1, characterized in that, A catalyst feeding port (4) is arranged on the reaction tube (8), and a catalyst unloading port (5) is arranged on the electric furnace heater (9).
3. The fluidized bed apparatus for hydrothermal treatment of pyridine catalyst according to claim 1, characterized in that, A heat tracing feeding pipe (3) is arranged on the electric furnace heater (9), the heat tracing feeding pipe (3) is a stainless steel pipe wrapped with a heat tracing belt, and the feeding pump (2) is connected with the heat tracing feeding pipe (3).
4. The fluid bed apparatus for hydrothermal treatment of pyridine catalyst of claim 1, wherein, A condenser (12) is arranged on the connecting pipe between the membrane tube (6) and the storage tank (13).
5. The fluid bed apparatus for hydrothermal treatment of pyridine catalyst of claim 1, wherein, A gas preheater (10) is arranged on the connecting pipe between the mass flow meter (11) and the distribution plate (7).
6. The fluid bed apparatus for hydrothermal treatment of pyridine catalyst of claim 1, wherein, A temperature sensor is arranged in the electric furnace heater (9).
7. The fluidized bed apparatus for the hydrothermal treatment of pyridine catalyst according to any one of claims 1 to 6, characterized in that An automatic control system is further arranged, and the electrical components of the fluidized bed device for pyridine catalyst hydrothermal treatment are connected with the automatic control system.