A high pressure hydrogenation reaction evaluation device

Abstract

The utility model discloses a kind of high-pressure hydrogenation reaction evaluation devices, it is related to the field of chemical equipment technology, it includes reactor, the side of the reactor is equipped with air inlet assembly and feed assembly, air inlet assembly and feed assembly are communicated with reactor by pipeline, air inlet assembly is used to transport gas to reactor, feed assembly transports raw material to reactor, the lower end of reactor is equipped with gas-liquid separation tank, gas-liquid separation tank is communicated with reaction tank by pipeline, gas-liquid separation tank is used to separate gas and liquid, gas-liquid separation tank top is communicated with gas outlet pipeline, gas-liquid separation tank lower end is communicated with sampling tank and storage tank, sampling tank upper end is equipped with emptying valve for pressure relief. The present application has the effect of improving the safety of device use.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, and in particular to a high-pressure hydrogenation reaction evaluation device. Background Technology

[0002] In the field of hydrogenation reaction technology, the synthesis and preparation of chemical raw materials are crucial. With the continuous development of industry, the demand for various high-performance materials is increasing, and the quality and quantity of chemical raw materials have a profound impact on the development of many downstream industries. 1,3-Propanediol, as a key chemical raw material, has a wide range of applications, covering synthetic fibers, pharmaceutical intermediates, detergents, antifreeze agents, and engineering plastics, playing an indispensable role, especially in the synthesis of high-performance polyester polypropylene terephthalate. Its importance motivates researchers to continuously explore more efficient preparation methods to meet market demands and drive the progress of the entire chemical industry.

[0003] The existing 1,3-propanediol preparation process mainly uses 3-hydroxypropanal as raw material and a supported nickel-molybdenum catalyst. This type of high-pressure hydrogenation reaction still uses simple pipeline connections to transport gas and raw materials directly into the reactor. After the reaction, the density difference between the gas and liquid is used for separation, and the separated liquid reaches the sampling tank.

[0004] In order to understand the catalytic performance of the catalyst in the above-mentioned technologies, it is necessary to sample and analyze the hydrogenated sample. However, the pressure in the sampling tank is often as high as 10 MPa, which poses a safety hazard to the sampling operators. Utility Model Content

[0005] To improve the safety of the device, this application provides a high-pressure hydrogenation reaction evaluation device.

[0006] This application provides a high-pressure hydrogenation reaction evaluation device, which adopts the following technical solution: A high-pressure hydrogenation reaction evaluation device includes a reactor. An inlet assembly and a feed assembly are provided on one side of the reactor. Both the inlet assembly and the feed assembly are connected to the reactor via pipelines. The inlet assembly is used to supply gas into the reactor, and the feed assembly supplies raw materials into the reactor. A gas-liquid separator is provided at the lower end of the reactor. The gas-liquid separator is connected to the reaction tank via a pipeline. The gas-liquid separator is used to separate gas and liquid. An outlet pipeline is connected to the top of the gas-liquid separator. A sampling tank and a storage tank are connected to the lower end of the gas-liquid separator. An air vent valve for depressurization is provided at the upper end of the sampling tank.

[0007] By adopting the above technical solution, the gas inlet assembly and feed assembly are connected to the reactor, which can stably transport gas and raw materials, ensuring that the hydrogenation reaction continues under the set operating conditions, reducing the impact of material transport interruption on reaction stability. The lower end of the reactor is directly connected to the gas-liquid separator, and the reaction products can quickly enter the separation stage. The separated gas is discharged through the top gas outlet pipe, while the liquid flows into the sampling tank and storage tank below. The upper end of the sampling tank is equipped with an air vent valve, which can gradually depressurize before sampling, reducing the high pressure in the tank to a safe range before operation, reducing the probability of personnel injury caused by direct injection of high-pressure materials, and improving the safety of the equipment.

[0008] Optionally, a preheating tank is provided on one side of the reactor. The preheating tank is connected to the feed assembly and the gas inlet assembly through pipelines. The preheating tank is used to preheat the temperature of the gas and liquid.

[0009] By adopting the above technical solution, the preheating tank can simultaneously preheat the raw materials conveyed by the feeding component and the gas of the gas inlet component to the temperature range required for the reaction, reduce the temperature fluctuation inside the tank caused by the direct entry of room temperature materials into the reactor, ensure that the catalyst always works at a suitable temperature, fully release catalytic activity, and improve reaction conversion rate and selectivity.

[0010] Optionally, the feeding assembly includes a raw material tank and a metering pump. The raw material tank is located on one side of the preheating tank, and the metering pump is fixed at the end of the pipeline between the raw material tank and the reactor, near the raw material tank.

[0011] By adopting the above technical solution, the raw material tank, as a container for storing raw materials, can store a certain amount of reaction raw materials, providing a stable material basis for the entire reaction process. The metering pump can accurately measure the amount of raw materials output from the raw material tank, and can precisely control the flow rate and total amount of raw materials entering the reactor according to the reaction requirements, thereby improving the ease of use of the device.

[0012] Optionally, the air intake assembly includes a hydrogen supply line and a nitrogen supply line. The hydrogen supply line is connected to the preheating tank via a pipeline, and the nitrogen supply line is connected to the preheating tank via a pipeline. The nitrogen supply line is used for purging the pipeline. A mass flow meter is installed at the end of both the nitrogen supply line and the hydrogen supply line near the preset tank.

[0013] By adopting the above technical solution, the hydrogen supply pipeline is directly connected to the preheating tank, ensuring a stable supply of the core reaction gas to the preheating stage. After simultaneous preheating with the raw materials, the gas enters the reactor. The nitrogen pipeline rapidly purges the hydrogen supply pipeline, preheating tank, and subsequent connecting pipelines, replacing residual hydrogen or reaction products, reducing safety hazards caused by residual gases, and minimizing impurity accumulation in the pipelines. The mass flow meter has high measurement accuracy and stability, providing real-time and accurate feedback on hydrogen and nitrogen flow rates. Operators can adjust the gas supply in a timely manner based on this information, ensuring that the gas flow rate remains within the set range throughout the reaction process, thus improving the ease of use of the equipment.

[0014] Optionally, the hydrogen supply pipeline has a branch hydrogen pipeline at the supply end, which is connected to the gas-liquid separator and the sampling tank respectively.

[0015] By adopting the above technical solution, hydrogen can be directly delivered to the gas-liquid separator and sampling tank, balancing the system pressure during the sampling process, reducing the interference of the sampling operation on the system pressure, reducing the adverse effects of pressure changes on the catalyst, and maintaining the stability of the catalyst performance.

[0016] Optionally, a buffer tank is installed on the connection line between the hydrogen supply line and the preheating tank to reduce liquid backflow.

[0017] By adopting the above technical solution, the buffer tank can intercept liquid raw materials or gas-liquid mixtures that may backflow in the preheating tank, reduce the probability of pipeline blockage and mass flow meter damage caused by liquid entering the hydrogen supply pipeline, ensure that hydrogen can be continuously and smoothly delivered to the preheating tank, and ensure a stable hydrogen flow rate required for the reaction.

[0018] Optionally, a back pressure valve is provided at one end of the gas outlet pipe near the gas-liquid separator. The back pressure valve is used to regulate the pressure of the gas-liquid separator.

[0019] By adopting the above technical solution, the back pressure valve controls the pressure of the separator by adjusting the gas flow rate, and indirectly forms a pressure linkage with components such as the reactor and buffer tank, thereby reducing the impact of abnormal gas-liquid separator pressure on the reaction pressure in the reactor and improving the stability of the device.

[0020] Optionally, a condenser is connected between the reactor and the gas-liquid separator, and a circulating low-temperature tank is installed on the outer layer of the condenser to reduce the temperature of the material.

[0021] By adopting the above technical solution, the circulating low temperature tank can quickly reduce the temperature of the high-temperature gas-liquid mixture discharged from the reactor, reduce the liquid droplets entrained in the gas phase, make the gas-liquid separation in the gas-liquid separator clearer and the separation more thorough. At the same time, the cooling can alleviate the thermal shock of temperature on the gas-liquid separator and extend the service life of the equipment.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. The separated gas is discharged through the top gas outlet pipe, while the liquid flows into the sampling tank and storage tank below. The sampling tank is equipped with an air vent valve at the top, which can gradually depressurize before sampling, reduce the high pressure in the tank to a safe range before operation, reduce the probability of personnel injury caused by direct spraying of high pressure materials, and improve the safety of the equipment. 2. The mass flow meter has high measurement accuracy and stability, and can provide real-time and accurate feedback on the flow rates of hydrogen and nitrogen. Operators can adjust the gas supply in a timely manner based on this information to ensure that the gas flow rate remains within the set range during the reaction process, thus improving the ease of use of the device; 3. The back pressure valve controls the pressure of the separator by adjusting the gas flow rate, and indirectly forms a pressure linkage with the reactor, buffer tank and other components, reducing the impact of abnormal gas-liquid separator pressure on the reaction pressure in the reactor and improving the stability of the equipment. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of a high-pressure hydrogenation reaction evaluation device.

[0024] Explanation of reference numerals in the attached drawings: 1. Reactor; 11. Preheating tank; 12. Condenser; 121. Circulating cryogenic tank; 2. Raw material tank; 3. Gas inlet assembly; 31. Hydrogen supply pipeline; 32. Nitrogen supply pipeline; 33. Mass flow meter; 34. Buffer tank; 4. Gas-liquid separator; 41. Sampling tank; 42. Storage tank; 43. Gas outlet pipeline; 44. Back pressure valve. Detailed Implementation

[0025] The present application will be further described in detail below with reference to all the accompanying drawings.

[0026] This application discloses a high-pressure hydrogenation reaction evaluation device. Example

[0027] Reference Figure 1A high-pressure hydrogenation reaction evaluation device includes a reactor 1, a preheating tank 11 on one side of the reactor 1, a raw material tank 2 and a hydrogen supply pipeline 31 on the other side of the preheating tank 11. The raw material tank 2 serves as a container for storing raw materials, capable of storing a certain amount of reaction raw materials to provide a stable material basis for the entire reaction process. The hydrogen supply pipeline 31 supplies gas. Both the hydrogen supply pipeline 31 and the raw material tank 2 are connected to the preheating tank 11 via pipelines. The preheating tank 11 is connected to the reactor 1 via a pipeline. After the raw materials and gas enter the preheating tank 11, the preheating tank 11 simultaneously preheats the gas and raw materials to the temperature range required for the reaction, and then they enter the subsequent reaction tank. The reaction tank contains the catalyst required for the reaction, reducing the temperature fluctuation inside the tank caused by the direct entry of room temperature materials into the reactor 1, ensuring that the subsequent catalyst always operates at a suitable temperature, fully releasing catalytic activity, and improving the reaction conversion rate and selectivity.

[0028] Reference Figure 1 A metering pump is installed on the connecting pipeline between the raw material tank 2 and the preheating tank 11. The metering pump can accurately measure the amount of raw material output from the raw material tank 2. According to the reaction requirements, the flow rate and total amount of raw material entering the reactor 1 can be precisely controlled, thereby improving the ease of use of the device.

[0029] Reference Figure 1 The lower end of reactor 1 is equipped with a gas-liquid separator 4, which is connected to the reaction vessel via a pipeline. The reacted substances reach the gas-liquid separator 4 for gas-liquid separation. The top of the gas-liquid separator 4 is connected to an outlet pipeline 43, from which the separated gas is discharged. Part of the discharged gas is directly vented, while the other part enters a gas chromatograph for component analysis. The lower end of the gas-liquid separator 4 is connected to a sampling tank 41 and a storage tank 42 via a pipeline. A control valve is installed on the pipeline connecting the gas-liquid separator 4 and the sampling tank 41. When the control valve is closed, the liquid does not flow into the sampling tank 41. When the control valve is open, the liquid flows into the sampling tank 41. The upper end of the sampling tank 41 is equipped with a vent valve. When it is necessary to take a sample from the sampling tank 41 for testing, the vent valve can gradually depressurize before sampling, reducing the high pressure in the sampling tank 41 to a safe range before operation, thereby reducing the probability of personnel injury caused by direct injection of high-pressure materials and improving the safety of the device.

[0030] Reference Figure 1 The hydrogen supply pipeline 31 has a branch hydrogen pipeline at the gas supply end. The branch hydrogen pipeline is connected to the gas-liquid separator 4 and the sampling tank 41 respectively, so that hydrogen can be directly delivered to the gas-liquid separator 4 and the sampling tank 41, balance the system pressure during the sampling process, reduce the interference of the sampling operation on the system pressure, reduce the adverse effects of pressure changes on the catalyst, and maintain the stability of the catalyst performance.

[0031] Reference Figure 1A nitrogen supply pipeline 32 is provided on one side of the hydrogen supply pipeline 31. The nitrogen supply pipeline 32 is connected to the preheating tank 11 through a pipeline. The nitrogen pipeline quickly purges the hydrogen supply pipeline 31, the preheating tank 11 and subsequent connecting pipelines to replace residual hydrogen or reaction products, reduce safety hazards caused by gas residue, and reduce the accumulation of impurities in the pipeline.

[0032] Reference Figure 1 A mass flow meter 33 is installed on the connecting pipeline between the hydrogen supply pipeline 31 and the nitrogen supply pipeline 32. The mass flow meter 33 has high measurement accuracy and stability, and can provide real-time and accurate feedback on the flow rate information of hydrogen and nitrogen. Operators can adjust the gas supply in a timely manner based on this information to ensure that the gas flow rate remains within the set range during the reaction process, thereby improving the ease of use of the device.

[0033] Reference Figure 1 The nitrogen supply pipeline 32 is equipped with a pressure gauge and a check valve. The pressure gauge can display the pressure in the nitrogen supply pipeline 32 in real time, allowing operators to intuitively grasp whether the purging pressure meets the requirements. The check valve can restrict the flow of nitrogen in one direction, reducing the backflow of high-pressure gas and gas-liquid mixture in reactor 1, preheating tank 11 or hydrogen supply pipeline 31 into the nitrogen pipeline, thereby improving the stability of the device.

[0034] Reference Figure 1 A condenser 12 is connected between the reactor 1 and the gas-liquid separator 4. A circulating low-temperature tank 121 is installed on the outer layer of the condenser 12. The circulating low-temperature tank 121 contains circulating cooling water. The cooling water exchanges heat with the high-temperature gas-liquid mixture, which quickly reduces the temperature of the high-temperature gas-liquid mixture discharged from the reactor 1, reduces liquid droplets entrained in the gas phase, and makes the gas-liquid stratification in the gas-liquid separator 4 clearer and the separation more thorough. At the same time, the direct entry of high-temperature materials into the gas-liquid separator 4 may cause abnormal pressure fluctuations in the tank. The cooling effect of the condenser 12 can alleviate the thermal shock of the separator and extend the service life of the equipment.

[0035] Reference Figure 1 A buffer tank 34 is provided on the connection line between the hydrogen supply line 31 and the preheating tank 11. The buffer tank 34 can intercept liquid raw materials or gas-liquid mixtures that may flow back into the preheating tank 11, reduce the probability of pipeline blockage and damage to the mass flow meter 33 caused by liquid entering the hydrogen supply line 31, ensure that hydrogen can be continuously and smoothly delivered to the preheating tank 11, and ensure a stable hydrogen flow rate required for the reaction.

[0036] Reference Figure 1A pressure reducing valve and a back pressure regulating valve 44 are respectively installed at the front and rear ends of reactor 1. The pressure reducing valve and the back pressure regulating valve 44 work together to precisely control the system pressure. A back pressure valve 44 is installed at the end of the gas outlet pipeline 43 near the gas-liquid separator 4. The back pressure valve 44 controls the pressure of the separator by adjusting the gas outlet flow rate, and indirectly forms a pressure linkage with components such as reactor 1 and buffer tank 34, so as to reduce the impact of abnormal pressure in gas-liquid separator 4 on the reaction pressure in reactor 1 and improve the stability of the device.

[0037] The implementation principle of the high-pressure hydrogenation reaction evaluation device in this application embodiment is as follows: after the gas and liquid are preheated in the preheating tank 11, they enter the reactor 1 for reaction. After the reaction is completed, they pass through the condenser 12 for heat exchange and then enter the gas separator for separation. The separated gas is discharged from the gas outlet pipe 43, while the liquid flows into the sampling tank 41 and the storage tank 42 below. The sampling tank 41 is equipped with an air vent valve at the upper end, which can gradually depressurize before sampling, reduce the high pressure in the tank to a safe range before operation, reduce the probability of personnel injury caused by direct injection of high-pressure materials, and improve the safety of the device.

[0038] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-pressure hydrogenation reaction evaluation device, comprising a reactor (1), characterized in that: The reactor (1) is provided with an air inlet assembly (3) and a feed assembly on one side. Both the air inlet assembly (3) and the feed assembly are connected to the reactor (1) through pipelines. The air inlet assembly (3) is used to deliver gas into the reactor (1), and the feed assembly delivers raw materials into the reactor (1). The lower end of the reactor (1) is provided with a gas-liquid separator (4). The gas-liquid separator (4) is connected to the reaction tank through pipelines. The gas-liquid separator (4) is used to separate gas and liquid. The top of the gas-liquid separator (4) is connected to an air outlet pipeline (43). The lower end of the gas-liquid separator (4) is connected to a sampling tank (41) and a storage tank (42). The upper end of the sampling tank (41) is provided with an air vent valve for depressurization.

2. The high-pressure hydrogenation reaction evaluation device according to claim 1, characterized in that: A preheating tank (11) is provided on one side of the reactor (1). The preheating tank (11) is connected to the feeding assembly and the air intake assembly (3) through pipelines. The preheating tank (11) is used to preheat the temperature of the gas and liquid.

3. The high-pressure hydrogenation reaction evaluation device according to claim 2, characterized in that: The feeding assembly includes a raw material tank (2) and a metering pump. The raw material tank (2) is located on one side of the preheating tank (11), and the metering pump is fixed at one end of the pipeline between the raw material tank (2) and the reactor (1) near the raw material tank (2).

4. The high-pressure hydrogenation reaction evaluation device according to claim 2, characterized in that: The air intake assembly (3) includes a hydrogen supply pipeline (31) and a nitrogen supply pipeline (32). The hydrogen supply pipeline (31) is connected to the preheating tank (11) through a pipeline, and the nitrogen supply pipeline (32) is connected to the preheating tank (11) through a pipeline. The nitrogen supply pipeline (32) is used to purge the pipeline. A mass flow meter (33) is provided at the end of both the nitrogen supply pipeline (32) and the hydrogen supply pipeline (31) near the preset tank.

5. The high-pressure hydrogenation reaction evaluation device according to claim 4, characterized in that: The hydrogen supply pipeline (31) has a branch hydrogen pipeline at the gas supply end, which is connected to the gas-liquid separator (4) and the sampling tank (41) respectively.

6. The high-pressure hydrogenation reaction evaluation device according to claim 4, characterized in that: A buffer tank (34) is provided on the connection line between the hydrogen supply pipeline (31) and the preheating tank (11). The buffer tank (34) is used to reduce liquid backflow.

7. The high-pressure hydrogenation reaction evaluation device according to claim 1, characterized in that: The gas outlet pipe (43) is equipped with a back pressure valve (44) at one end near the gas-liquid separator (4). The back pressure valve (44) is used to regulate the pressure of the gas-liquid separator (4).

8. The high-pressure hydrogenation reaction evaluation device according to claim 1, characterized in that: A condenser (12) is provided between the reactor (1) and the gas-liquid separator (4). A circulating low-temperature tank (121) is provided on the outer layer of the condenser (12) to reduce the temperature of the material.

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