A temperature control system based on cryogenic hydrogenation technology

Abstract

This utility model relates to a temperature control system based on cryogenic hydrogenation technology, comprising a stabilization tower, a cooler, and a stripping tower. The cooler includes a cooling box, heat exchange straight pipes, heat exchange coils, and a temperature control component. The heat exchange straight pipe sections and heat exchange coil sections are fixed inside the cooling box. The temperature control component is used to cool the heat exchange medium in the cooling box. The output end of the stabilization tower is connected to a first main pipe, and the input end of the stripping tower is connected to a second main pipe. The input end of the heat exchange straight pipe is connected to the first main pipe via a first branch pipe, and the output end of the heat exchange straight pipe is connected to the second main pipe via a second branch pipe. The input end of the heat exchange coil is connected to the first main pipe via a third branch pipe, and the output end of the heat exchange coil is connected to the second main pipe via a fourth branch pipe. This utility model improves the regulation effect and accuracy of hydrogenated oil cooling, reduces cooling medium consumption, and saves resources.

Description

Technical Field

[0001] This utility model relates to the field of low-temperature hydrogen production technology, specifically to a temperature control system based on low-temperature hydrogen production technology. Background Technology

[0002] Phenylglycine and its derivatives are important pharmaceutical intermediates, commonly used in the synthesis of β-lactam antibiotics such as ampicillin, cephalexin, and cefadroxil, as well as in the synthesis of polypeptide hormones and various pesticides. In the production of phenylglycine, the American Axens low-temperature gas-liquid two-phase hydrogenation process is generally used. This process involves first cooling the hydrogenated oil from unit 100, then introducing it into an intermediate tank, and finally pumping it to unit 200 for reheating. This process of cooling and then reheating results in wasted heating steam.

[0003] Patent CN210646322U discloses a cryogenic hydrogenation device. This patent uses a water cooler to cool the hydrogenated oil. However, the temperature control component of the water cooler only regulates the cooling temperature by controlling the flow rate of the return water pipeline through a regulating valve. The temperature regulation effect is still insufficient and needs improvement. Furthermore, the water cooler only circulates cooling water, resulting in a large consumption of cooling water and wasting resources. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies by providing a temperature control system based on low-temperature hydrogenation technology, which improves the regulation effect and accuracy of hydrogenated oil cooling, reduces cooling medium consumption, and saves resources.

[0005] This utility model is achieved through the following technical solution: a temperature control system based on cryogenic hydrogenation technology, comprising a stabilization tower, a cooler, and a stripping tower. The cooler includes a cooling box, heat exchange straight pipes, heat exchange coils, and a temperature control component. The heat exchange straight pipe section and the heat exchange coil section are both fixed inside the cooling box. The temperature control component is used to cool the heat exchange medium in the cooling box. The output end of the stabilization tower is connected to a first main pipe, and the input end of the stripping tower is connected to a second main pipe. The input end of the heat exchange straight pipe is connected to the first main pipe through a first branch pipe, and the output end of the heat exchange straight pipe is connected to the second main pipe through a second branch pipe. The input end of the heat exchange coil is connected to the first main pipe through a third branch pipe, and the output end of the heat exchange coil is connected to the second main pipe through a fourth branch pipe. Regulating valves are installed on the first and third branch pipes, and one-way valves are installed on the second and fourth branch pipes.

[0006] This solution employs two types of heat exchange pipelines within the cooling tank. The straight heat exchange pipes have a shorter path, resulting in a shorter cooling time and smaller temperature drop for the hydrogenated oil output from the stabilizer tower as it passes through them. Conversely, the heat exchange coils have a longer path within the cooling tank, leading to a longer cooling time and a larger temperature drop for the hydrogenated oil as it passes through them. Therefore, by combining these two types of heat exchange pipelines, cooling can be achieved using only one type or both types simultaneously. Combined with a temperature control component to regulate the temperature of the heat exchange medium, this allows for more precise control over the cooling effect of the hydrogenated oil.

[0007] As an optimization, a temperature sensor is installed on the second main pipe, and the regulating valves of the first and third branch pipes are electrically connected to the temperature sensor. This optimized solution automatically adjusts the flow rate of the heat exchange straight pipe and heat exchange coil based on the temperature status of the final input stripping tower, thereby automatically controlling the cooling temperature of the hydrogenated oil and making it more convenient to use.

[0008] As an optimization, the temperature control component includes a cooling tube array, a metering pump, a gas-liquid converter, and a liquid nitrogen storage tank. The cooling tube array is fixed inside the cooling tank. The output end of the liquid nitrogen storage tank is connected to the input end of the metering pump via a third main pipe. The output end of the metering pump is connected to the input end of the cooling tube array via a fourth main pipe. The output end of the cooling tube array is connected to the input end of the gas-liquid converter via a fifth main pipe. The output end of the gas-liquid converter is connected to the input end of the liquid nitrogen storage tank via a sixth main pipe. This optimized scheme uses the metering pump to input liquid nitrogen from the liquid nitrogen storage tank into the cooling tube array. Heat exchange occurs between the cooling tube array and the heat exchange medium, thus cooling the hydrogenated oil. After heat exchange, the liquid nitrogen is converted into gaseous nitrogen, which is then converted back into liquid nitrogen by the gas-liquid converter, achieving the recycling of the cooling medium and saving resources.

[0009] As an optimization, both the fifth and sixth main pipes are equipped with on / off valves. This optimized design facilitates the control of the input and output of the cooling medium.

[0010] As an optimization, multiple cooling tubes are connected in parallel between the fourth and fifth main pipes, and these cooling tubes are evenly distributed within the cooling box. This optimized scheme achieves uniform heat exchange and ensures cooling stability by using multiple cooling tubes to uniformly cool the heat exchange medium within the cooling box.

[0011] The beneficial effects of this invention are as follows: By setting two types of heat exchange pipelines in the cooling tank, the straight heat exchange pipe has a shorter path, resulting in a shorter cooling time and smaller temperature drop for the hydrogenated oil output from the stabilizer tower when passing through it. Conversely, the heat exchange coil has a longer path within the cooling tank, leading to a longer cooling time and a larger temperature drop for the hydrogenated oil when passing through it. Therefore, by combining these two heat exchange pipelines, cooling can be performed using only one pipeline or both pipelines can be used simultaneously. Combined with a temperature control component to regulate the temperature of the heat exchange medium, the cooling effect of the hydrogenated oil can be more precisely controlled.

[0012] Liquid nitrogen from the storage tank is pumped into the cooler via a metering pump. The cooled oil is cooled through heat exchange between the cooling tubes and the heat exchange medium. After heat exchange, the liquid nitrogen is converted into gaseous nitrogen, which is then converted back into liquid nitrogen via a gas-liquid converter, thus achieving the recycling of the cooling medium and saving resources. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the process of this utility model;

[0014] Figure 2 This is a schematic diagram of the cooler process;

[0015] As shown in the figure:

[0016] 1. Stabilizer, 2. Cooler, 3. Stripping tower, 4. First main pipe, 5. First branch pipe, 6. Third branch pipe, 7. Second branch pipe, 8. Fourth branch pipe, 9. Second main pipe, 10. Temperature sensor, 11. Regulating valve, 12. Check valve, 13. Switch valve, 21. Cooling tank, 22. Heat exchange straight pipe, 23. Heat exchange coil, 24. Cooling tube array, 25. Liquid nitrogen storage tank, 26. Metering pump, 27. Gas-liquid converter, 28. Third main pipe, 29. Fourth main pipe, 30. Fifth main pipe, 31. Sixth main pipe, 32. Discharge pipe, 33. Liquid nitrogen input pipe, 34. Heat exchange medium output pipe, 35. Heat exchange medium input pipe. Detailed Implementation

[0017] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0018] like Figures 1-2 As shown, a temperature control system based on cryogenic hydrogenation technology includes a stabilizing tower 1, a cooler 2, and a stripping tower 3. The cooler 2 includes a cooling box 21, heat exchange straight tubes 22, heat exchange coils 23, and a temperature control component. The heat exchange straight tubes 22 and heat exchange coils 23 are both fixed inside the cooling box 21, and the temperature control component is used to cool the heat exchange medium in the cooling box 21.

[0019] In this embodiment, the inlet and outlet ends of the heat exchange straight tube 22 and the inlet and outlet ends of the heat exchange coil 23 extend to the outside of the cooling box 21 and are fixed with flanges for easy connection to other pipelines. In this embodiment, the heat exchange coil 23 is a serpentine bend, which has a larger heat exchange area than the heat exchange straight tube 22, resulting in a lower cooling temperature for the hydrogenated oil passing through it.

[0020] In this embodiment, the cooling box 21 is provided with a heat exchange medium inlet pipe 35 and a heat exchange medium outlet pipe 34 at the top and bottom, respectively. A switch valve 13 is installed on both the heat exchange medium inlet pipe 35 and the heat exchange medium outlet pipe 34. The heat exchange medium is introduced into the cooling box 21 through the heat exchange medium inlet pipe 35 and discharged through the heat exchange medium outlet pipe 34.

[0021] The output end of the stabilizing tower 1 is connected to the first main pipe 4, and the input end of the stripping tower 3 is connected to the second main pipe 9. The input end of the heat exchange straight pipe 22 is connected to the first main pipe 4 via the first branch pipe 5, and the output end of the heat exchange straight pipe 22 is connected to the second main pipe 9 via the second branch pipe 7. The input end of the heat exchange coil 23 is connected to the first main pipe 4 via the third branch pipe 6, and the output end of the heat exchange coil 23 is connected to the second main pipe 9 via the fourth branch pipe 8. A regulating valve 11 is installed on both the first branch pipe 5 and the third branch pipe 6, and a one-way valve 12 is installed on both the second branch pipe 7 and the fourth branch pipe 8.

[0022] Specifically, one end of the first main pipe 4 is connected to the output end of the stabilizer tower 1, and the first branch pipe 5 and the third branch pipe 6 are connected to the other end of the first main pipe 4 via a tee. One end of the second main pipe 9 is connected to the input end of the stripping tower 3, and the second branch pipe 7 and the fourth branch pipe 8 are connected to the other end of the second main pipe 9 via a tee.

[0023] By incorporating two types of heat exchange pipelines—straight heat exchange pipes 22 and heat exchange coils 23—within the cooling tank 21, the shorter path of the straight heat exchange pipes results in a shorter cooling time and smaller temperature drop for the hydrogenated oil output from the stabilizer tower 1. Conversely, the longer path of the heat exchange coils within the cooling tank 21 leads to a longer cooling time and a larger temperature drop for the hydrogenated oil. Therefore, by combining these two heat exchange pipelines, either a single pipeline can be used for cooling, or both can be used simultaneously to cool the hydrogenated oil. Furthermore, by coordinating with a temperature control component to regulate the temperature of the heat exchange medium, the cooling effect of the hydrogenated oil can be more precisely controlled.

[0024] A temperature sensor 10 is installed on the second main pipe 9, and the regulating valves 11 on the first branch pipe 5 and the third branch pipe 6 are electrically connected to the temperature sensor 10. By monitoring the temperature of the final input stripping tower 3, the flow rates of the heat exchange straight pipe 22 and the heat exchange coil 23 are automatically adjusted, thereby automatically controlling the cooling temperature of the hydrogenated oil, making it more convenient to use.

[0025] The temperature control assembly includes a cooling tube array 24, a metering pump 26, a gas-liquid converter 27, and a liquid nitrogen storage tank 25. The cooling tube array 24 is fixed inside the cooling box 21. The output end of the liquid nitrogen storage tank 25 is connected to the input end of the metering pump 26 via a third main pipe 28, and the output end of the metering pump 26 is connected to the input end of the cooling tube array 24 via a fourth main pipe 29. The output end of the cooling tube array 24 is connected to the input end of the gas-liquid converter 27 via a fifth main pipe 30, and the output end of the gas-liquid converter 27 is connected to the input end of the liquid nitrogen storage tank 25 via a sixth main pipe 31.

[0026] In this embodiment, the cooling tube 24 can be directly purchased, and the gas-liquid converter 27 is an SMC CCT63-300 model. Liquid nitrogen cooling medium from the liquid nitrogen storage tank 25 is input into the cooling tube 24 via a metering pump 26. The metering pump 26 controls the output of liquid nitrogen, thereby controlling the flow rate of the cooling medium and facilitating adjustment of the heat exchange temperature.

[0027] The hydrogenated oil is cooled by heat exchange through the cooling tube 24 and the heat exchange medium. After heat exchange, the liquid nitrogen is converted into gaseous nitrogen, and then converted back into liquid nitrogen by the gas-liquid converter 27, realizing the recycling of the liquid nitrogen cooling medium and saving resources.

[0028] Preferably, a plurality of cooling tubes 24 are connected in parallel between the fourth main tube 29 and the fifth main tube 30, and the plurality of cooling tubes 24 are evenly distributed within the cooling box 21. The heat exchange medium within the cooling box 21 is uniformly cooled by the plurality of cooling tubes 24, thereby improving cooling efficiency, achieving uniform heat exchange, and ensuring cooling stability.

[0029] Both the fifth main pipe 30 and the sixth main pipe 31 are equipped with switching valves 13 to facilitate the control of the input and output of the cooling medium.

[0030] In this embodiment, a discharge pipe 32 is also connected to the fifth pipe 30. The discharge pipe 32 is located at the front end of the switch valve 13 of the fifth main pipe 30, and the switch valve 13 is installed on the discharge pipe 32. The cooling medium is discharged through the discharge pipe 32, which facilitates the subsequent replacement of the cooling medium.

[0031] In this embodiment, the liquid nitrogen storage tank 25 is equipped with a liquid nitrogen inlet pipe 33, and a switch valve 13 is installed on the liquid nitrogen inlet pipe 33. Cooling medium is introduced into the liquid nitrogen storage tank 25 through the liquid nitrogen inlet pipe.

[0032] Working Principle: The hydrogenated oil output from the stabilizer tower 1 can be transported via heat exchange straight pipe 22, heat exchange coil 23, or both simultaneously. Based on the reaction temperature of temperature sensor 10, when the temperature is lower than the set temperature, it can be transported via heat exchange straight pipe 22, resulting in minimal temperature fluctuation. When the temperature is higher than the set temperature, it can be transported via heat exchange coil 23, resulting in a larger temperature fluctuation. Alternatively, temperature sensor 10 can automatically adjust the opening of the regulating valves 11 in both pipes according to the set temperature, thereby automatically adjusting the flow rate in both pipes to ensure the cooling temperature remains at the set value, making it more convenient to use.

[0033] Simultaneously, the temperature control component inputs liquid nitrogen cooling medium from the liquid nitrogen storage tank 25 into the cooling tubes via metering pump 26. Metering pump 26 controls the output of liquid nitrogen, thereby controlling the flow rate of the cooling medium and facilitating adjustment of the heat exchange medium temperature. Heat exchange and cooling occur through the cooling tubes 24 and the heat exchange medium in the cooling tank 21, thus cooling the hydrogenated oil. After heat exchange, the liquid nitrogen is converted into gaseous nitrogen, which is then converted back into liquid nitrogen via gas-liquid converter 27, achieving the recycling of the liquid nitrogen cooling medium and saving resources.

[0034] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A temperature control system based on cryogenic hydrogenation technology, comprising a stabilizer (1), a cooler (2), and a stripping tower (3), characterized in that: The cooler (2) includes a cooling box (21), a heat exchange straight tube (22), a heat exchange coil (23), and a temperature control component. The heat exchange straight tube (22) and the heat exchange coil (23) are both fixed inside the cooling box (21). The temperature control component is used to cool the heat exchange medium of the cooling box (21). The output end of the stabilizer tower (1) is connected to the first main pipe (4), the input end of the stripping tower (3) is connected to the second main pipe (9), the input end of the heat exchange straight pipe (22) is connected to the first main pipe (4) through the first branch pipe (5), the output end of the heat exchange straight pipe (22) is connected to the second main pipe (9) through the second branch pipe (7), the input end of the heat exchange coil (23) is connected to the first main pipe (4) through the third branch pipe (6), and the output end of the heat exchange coil (23) is connected to the second main pipe (9) through the fourth branch pipe (8). A regulating valve (11) is installed on the first branch pipe (5) and the third branch pipe (6), and a one-way valve (12) is installed on the second branch pipe (7) and the fourth branch pipe (8).

2. The temperature control system based on cryogenic hydrogenation technology according to claim 1, characterized in that: A temperature sensor (10) is installed on the second main pipe (9), and the regulating valves (11) of the first branch pipe (5) and the third branch pipe (6) are electrically connected to the temperature sensor (10).

3. The temperature control system based on cryogenic hydrogenation technology according to claim 1, characterized in that: The temperature control assembly includes a cooling tube (24), a metering pump (26), a gas-liquid converter (27), and a liquid nitrogen storage tank (25). The cooling tube (24) is fixed inside the cooling box (21). The output end of the liquid nitrogen storage tank (25) is connected to the input end of the metering pump (26) through a third main pipe (28). The output end of the metering pump (26) is connected to the input end of the cooling tube (24) through a fourth main pipe (29). The output end of the cooling tube (24) is connected to the input end of the gas-liquid converter (27) through a fifth main pipe (30). The output end of the gas-liquid converter (27) is connected to the input end of the liquid nitrogen storage tank (25) through a sixth main pipe (31).

4. The temperature control system based on cryogenic hydrogenation technology according to claim 3, characterized in that: Both the fifth main pipe (30) and the sixth main pipe (31) are equipped with switching valves (13).

5. The temperature control system based on cryogenic hydrogenation technology according to claim 3, characterized in that: Multiple cooling tubes (24) are connected in parallel between the fourth main tube (29) and the fifth main tube (30), and the multiple cooling tubes (24) are evenly distributed in the cooling box (21).

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