Sodium phenylacetate continuous acidification separation unit

Abstract

This invention provides a continuous acidification and separation device for sodium phenylacetate, belonging to the field of chemical equipment technology. It includes: a feeding unit, a separation unit, and a receiving unit connected sequentially by pipelines; the feeding unit includes a sulfuric acid storage tank, a sodium phenylacetate storage tank, and a first pipeline mixer, with the sulfuric acid storage tank and the sodium phenylacetate storage tank respectively connected to the first pipeline mixer via pipelines; the separation unit includes a separation tower, with an oil-water coalescing membrane assembly installed at the feed end of the separation tower; the first pipeline mixer is connected to the oil-water coalescing membrane assembly via pipelines; the receiving unit includes an oil phase receiving vessel and an aqueous phase receiving vessel; the oil phase pipeline at the top of the separation tower is connected to the oil phase receiving vessel, and the aqueous phase pipeline at the bottom of the separation tower is connected to the aqueous phase receiving vessel. This invention achieves effective separation of the phenylacetic acid oil phase and the sodium sulfate aqueous phase through the oil-water coalescing membrane assembly, solving the problem of unclear oil-water interface during the continuous acidification of sodium phenylacetate, which leads to low quality of the phenylacetic acid product.

Description

Technical Field

[0001] This utility model belongs to the field of chemical equipment technology, specifically relating to a continuous acidification and separation device for sodium phenylacetate. Background Technology

[0002] The production of penicillin series products consumes 82.16% of phenylacetic acid, meaning the phenylacetic acid market's fortunes are largely tied to the fate of penicillin series products. In recent years, with the rapid development of penicillin G salt and its downstream industries, the demand for phenylacetic acid has shown a rapid growth trend. However, currently, the production of phenylacetic acid through the acidification of sodium phenylacetate is mostly carried out in intermittent batch processes. This repetitive and frequent operation leads to high labor intensity for employees, and the quality of phenylacetic acid products is subject to fluctuations due to human intervention, making it difficult to meet the high-end demands of high-end users. Furthermore, intermittent batch production results in low production efficiency, requiring large equipment and a large floor space.

[0003] While the currently disclosed continuous acidification production process for phenylacetic acid has alleviated the problems of high labor intensity, low production efficiency, and large land area to some extent, it cannot guarantee the effective separation of the phenylacetic acid oil phase and the sodium sulfate aqueous phase, and it is also difficult to meet the high-end demands of high-end users for the quality of phenylacetic acid products. Utility Model Content

[0004] This utility model provides a continuous acidification separation device for sodium phenylacetate, which aims to solve the problem that existing devices cannot guarantee the effective separation of the oil phase of phenylacetic acid and the aqueous phase of sodium sulfate, resulting in low-quality phenylacetic acid products that are difficult to meet the high-end users' demand for high-quality phenylacetic acid products.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a continuous acidification and separation device for sodium phenylacetate, comprising: a feeding unit, a separation unit and a receiving unit connected sequentially by pipelines;

[0006] The feeding unit includes a sulfuric acid storage tank, a sodium phenylacetate storage tank, and a first pipeline mixer. The sulfuric acid storage tank and the sodium phenylacetate storage tank are respectively connected to the first pipeline mixer through pipelines.

[0007] The separation unit includes a separation tower, and an oil-water coalescing membrane assembly is provided at the feed end of the separation tower; the first pipeline mixer is connected to the oil-water coalescing membrane assembly through a pipeline;

[0008] The receiving unit includes an oil phase receiving vessel and an aqueous phase receiving vessel; the oil phase pipeline at the top of the separation tower is connected to the oil phase receiving vessel, and the aqueous phase pipeline at the bottom of the separation tower is connected to the aqueous phase receiving vessel.

[0009] In one possible implementation, a first liquid-liquid interface device is disposed above the oil-water coalescing membrane assembly, and a second liquid-liquid interface device is disposed below the oil-water coalescing membrane assembly; a fifth regulating valve and a fifth flow meter are disposed on the aqueous phase pipeline, and the first liquid-liquid interface device and the second liquid-liquid interface device are respectively linked to the fifth regulating valve.

[0010] In one feasible embodiment, the oil phase pipeline is an externally jacketed pipeline, and a second thermometer for detecting the water temperature inside the jacket is installed on the oil phase pipeline.

[0011] In one possible implementation, a first delivery pump, a first regulating valve, and a first flow meter are installed on the pipeline between the sulfuric acid storage tank and the first pipeline mixer, and a first pH meter and a first thermometer are installed on the pipeline between the first pipeline mixer and the separation tower. The first pH meter is linked to the first regulating valve; the opening degree of the first regulating valve is controlled by the value displayed by the first pH meter.

[0012] In one possible implementation, a second delivery pump, a second flow meter, and a second regulating valve are provided on the pipeline between the sodium phenylacetate storage tank and the first pipeline mixer; the second flow meter is linked to the second regulating valve.

[0013] In one possible implementation, a cleaning unit is further included, comprising a high-temperature water storage tank and a second pipeline mixer connected by pipelines, the second pipeline mixer being connected by pipelines to the separation tower, the oil phase receiving vessel, and the aqueous phase receiving vessel respectively; a third delivery pump, a fourth flow meter, and a fourth regulating valve are installed on the pipeline between the high-temperature water storage tank and the second pipeline mixer; a second pH meter is installed on the pipeline between the second pipeline mixer and the separation tower.

[0014] In one possible implementation, the second pipeline mixer is connected via a first branch pipe to the pipeline between the separation tower and the oil phase receiving vessel; the second pipeline mixer is connected via a second branch pipe to the pipeline between the separation tower and the aqueous phase receiving vessel.

[0015] In one possible implementation, the first delivery pump is connected to the second pipeline mixer via a pipeline, and a third flow meter and a third regulating valve are installed on the pipeline between the first delivery pump and the second pipeline mixer; the third regulating valve is linked to the second pH meter.

[0016] In one possible implementation, an emergency pipeline is also provided between the bottom of the separation tower and the top of the oil phase receiving vessel, and an emergency delivery pump is installed on the emergency pipeline.

[0017] The continuous acidification separation device for sodium phenylacetate provided by this utility model has the following advantages compared with the prior art: Sodium phenylacetate solution and sulfuric acid are introduced into the first pipeline mixer by the pumps on their respective pipelines, and mixed and reacted inside the first pipeline mixer; the material discharged from the first pipeline mixer enters the interior of the oil-water coalescing membrane module through the feed end of the separation tower, and the oil phase of phenylacetic acid and the aqueous phase of sodium sulfate are effectively separated through the oil-water coalescing membrane module. The oil phase of phenylacetic acid overflows from the upper end of the separation tower into the oil phase receiving vessel, and the aqueous phase of sodium sulfate is discharged from the lower end of the separation tower into the aqueous phase receiving vessel.

[0018] The working principle of the oil-water coalescing membrane module is mainly based on the immiscibility and density difference between oil and water. It can effectively separate oil-water mixtures to purify oil products. It can solve the problem that during the continuous acidification of sodium phenylacetate, the oil-water interface is unclear, and the water phase carries the oil phase or the oil phase carries the water phase, resulting in low quality of phenylacetic acid products and making it difficult to meet the demand of high-end users for high-quality phenylacetic acid products.

[0019] The working process of the oil-water coalescing membrane module provided in this application mainly consists of three processes:

[0020] Preliminary separation: When the mixture of phenylacetic acid oil phase and sodium sulfate water phase enters the oil-water coalescing membrane module, the internal filter structure allows the phenylacetic acid oil droplets and sodium sulfate water droplets to collide and coalesce during flow. Due to the different densities of the phenylacetic acid oil phase and the sodium sulfate water phase, they gradually separate into layers under the influence of gravity.

[0021] Coalescence: The coalescing filter element inside the oil-water coalescing membrane module can further promote the coalescence of phenylacetic acid oil droplets and sodium sulfate water droplets. The coalescing filter element has lipophilic properties, which can adsorb and coalesce tiny phenylacetic acid oil droplets, causing them to gradually grow larger and eventually separate from the sodium sulfate aqueous phase.

[0022] Discharge of separated products: After coalescence, larger phenylacetic acid oil droplets and sodium sulfate brine water droplets will accumulate at the bottom and top of the oil-water coalescence membrane module under the influence of gravity. At this time, the phenylacetic acid oil phase and sodium sulfate water phase are discharged through the oil drain port at the top and the water drain port at the bottom of the oil-water coalescence membrane module, respectively, thereby achieving effective separation of the oil and water phases. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the sodium phenylacetate continuous acidification separation device provided in the embodiment of this utility model;

[0024] Figure 2 This is a top view of the structure of the oil-water coalescing membrane assembly provided in an embodiment of the present invention;

[0025] Figure 3 for Figure 2A schematic diagram of the main structure of the oil-water coalescing membrane module provided in the embodiment;

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. High-temperature water storage tank; 2. Sulfuric acid storage tank; 3. Sodium phenylacetate storage tank; 4. Separation tower; 5. Oil phase receiving vessel; 6. Aqueous phase receiving vessel; 7. First transfer pump; 8. Second transfer pump; 9. Emergency transfer pump; 10. Third transfer pump; 11. Second pipeline mixer; 12. Second pH meter; 13. Second thermometer; 14. First pipeline mixer; 15. First pH meter; 16. First thermometer; 17. Oil-water coalescing membrane module; 18. First liquid-liquid interface meter; 19. Second liquid-liquid interface meter; 20. Fifth regulating valve; 29. ​​Emergency pipeline; 30. Fourth flow meter; 31. Third flow meter; 32. Fourth regulating valve; 33. Third regulating valve; 34. First flow meter; 35. Second flow meter; 36. First regulating valve; 37. Second regulating valve; 38. Fifth flow meter. Detailed Implementation

[0028] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0029] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0030] While currently available technologies can achieve continuous acidification production of phenylacetic acid and improve its production efficiency to some extent, they do not address how to ensure effective separation of the oil and water phases during the separation of the phenylacetic acid oil phase and the sodium sulfate aqueous phase. To address these shortcomings, the applicant provides a device that can achieve both continuous acidification and separation of sodium phenylacetate and separation of the phenylacetic acid oil and sodium sulfate aqueous phases. This device not only improves the quality of the phenylacetic acid product but also increases its production efficiency, reduces labor intensity, and features a compact layout that minimizes floor space requirements.

[0031] Please see Figures 1 to 3The continuous acidification and separation device for sodium phenylacetate provided by this utility model is described below. The continuous acidification and separation device for sodium phenylacetate includes: a feeding unit, a separation unit, and a receiving unit connected sequentially by pipelines; the feeding unit includes a sulfuric acid storage tank 2, a sodium phenylacetate storage tank 3, and a first pipeline mixer 14, with the sulfuric acid storage tank 2 and the sodium phenylacetate storage tank 3 respectively connected to the first pipeline mixer 14 via pipelines; the separation unit includes a separation tower 4, with an oil-water coalescing membrane assembly 17 installed at the feed end of the separation tower 4; the first pipeline mixer 14 is connected to the oil-water coalescing membrane assembly 17 via a pipeline; the receiving unit includes an oil phase receiving vessel 5 and an aqueous phase receiving vessel 6; the oil phase pipeline at the top of the separation tower 4 is connected to the oil phase receiving vessel 5, and the aqueous phase pipeline at the bottom of the separation tower 4 is connected to the aqueous phase receiving vessel 6.

[0032] The sodium phenylacetate continuous acidification separation device provided by this utility model has the following advantages compared with the prior art: sodium phenylacetate solution and sulfuric acid are introduced into the first pipeline mixer 14 by the pumps on their respective pipelines, and mixed and reacted inside the first pipeline mixer 14; the material discharged from the first pipeline mixer 14 enters the interior of the oil-water coalescing membrane assembly 17 through the feed end of the separation tower 4, and the oil phase of phenylacetic acid and the aqueous phase of sodium sulfate are effectively separated by the oil-water coalescing membrane assembly 17. The oil phase of phenylacetic acid overflows from the upper end of the separation tower 4 into the oil phase receiving vessel 5, and the aqueous phase of sodium sulfate is discharged from the lower end of the separation tower 4 into the aqueous phase receiving vessel 6.

[0033] The working principle of the oil-water coalescing membrane module 17 is mainly based on the immiscibility and density difference between oil and water. It can effectively separate oil-water mixtures to purify oil products. It can solve the problem that during the continuous acidification of sodium phenylacetate, the interface between the oil and water phases is unclear, and the water phase carries the oil phase or the oil phase carries the water phase, resulting in low quality of phenylacetic acid products and difficulty in meeting the demand of high-end users for high-quality phenylacetic acid products.

[0034] The working process of the oil-water coalescing membrane module 17 provided in this application mainly consists of three processes:

[0035] Preliminary separation: When the mixture of phenylacetic acid oil phase and sodium sulfate water phase enters the oil-water coalescing membrane module 17, the internal filter structure allows the phenylacetic acid oil droplets and sodium sulfate water droplets to collide and coalesce during flow. Due to the different densities of the phenylacetic acid oil phase and the sodium sulfate water phase, they gradually separate into layers under the influence of gravity.

[0036] Coagulation: The coalescing filter element inside the oil-water coalescing membrane module 17 can further promote the coalescence of phenylacetic acid oil droplets and sodium sulfate water droplets. The coalescing filter element has lipophilic properties, which can adsorb and coalesce tiny phenylacetic acid oil droplets, causing them to gradually grow larger and eventually separate from the sodium sulfate aqueous phase.

[0037] Discharge of separated products: After coalescence, larger phenylacetic acid oil droplets and sodium sulfate brine water droplets will accumulate at the bottom and top of the oil-water coalescence membrane module 17 under the influence of gravity. At this time, the phenylacetic acid oil phase and sodium sulfate water phase are discharged through the oil drain port at the top and the water drain port at the bottom of the oil-water coalescence membrane module 17, respectively, thereby achieving effective separation of the oil and water phases.

[0038] The oil-water coalescing membrane module 17 referred to in this application, also known as an oil-water separator coalescer, is a conventional oil-water separation device. The oil-water coalescing membrane module 17 is horizontally embedded within the separation tower 4. The outer shell of the oil-water coalescing membrane module 17 is threadedly connected to the separation tower 4 and sealed with a PTFE gasket. Specifically, the separation tower is divided into upper and lower parts, with the oil-water coalescing membrane module 17 located between the two parts. The upper end of the outer shell of the oil-water coalescing membrane module 17 is threadedly connected to the upper separation tower, and the lower end of its outer shell is threadedly connected to the lower separation tower.

[0039] In some embodiments, see Figure 1 A first liquid-liquid interface device 18 is provided above the oil-water coalescing membrane assembly 17, and a second liquid-liquid interface device 19 is provided below the oil-water coalescing membrane assembly 17; a fifth regulating valve 20 and a fifth flow meter 38 are provided on the aqueous phase pipeline, and the first liquid-liquid interface device 18 and the second liquid-liquid interface device 19 are respectively linked with the fifth regulating valve 20.

[0040] In this embodiment, the flow rate of the sodium sulfate aqueous phase is accumulated in real time by the value displayed by the fifth flow meter 38; the opening degree of the fifth regulating valve 20 is controlled in real time according to the values ​​displayed by the first liquid-liquid interface meter 18 and the second liquid-liquid interface meter 19, and the separation liquid level of the oil and water phases in the separation tower 4 is controlled in real time by the opening degree of the fifth regulating valve 20, thereby ensuring the stability of production operation.

[0041] The separation tower 4 is equipped with two liquid-liquid interface instruments. The first liquid-liquid interface instrument 18 is located above the oil-water coalescing membrane assembly 17, and the second liquid-liquid interface instrument 19 is located below the oil-water coalescing membrane assembly 17. The vertical distance between the first liquid-liquid interface instrument 18, the second liquid-liquid interface instrument 19 and the oil-water coalescing membrane assembly 17 is 800mm.

[0042] In practical applications, the liquid-liquid interface instrument used in this device is a multi-parameter oil-water interface instrument. By integrating guided wave radar and capacitance measurement principles through a fusion sensor, it overcomes the limitations of individual measurements and realizes interface measurement under complex working conditions.

[0043] In some embodiments, see Figure 1 The oil phase pipeline is an externally jacketed pipeline, and a second thermometer 13 is installed on the oil phase pipeline to detect the water temperature inside the jacket.

[0044] It should be noted that the pipeline connecting the separation tower 4 and the oil phase receiving vessel 5 is an externally jacketed pipeline. The jacket contains constant-temperature hot water, and the flow rate of this hot water is controlled in real time by the temperature reading displayed on the second thermometer 13. This ensures that the temperature reading on the second thermometer 13 is always maintained above 76.5℃, preventing the phenylacetic acid oil phase from crystallizing and clogging the pipeline. This design also facilitates continuous production, improves product quality, reduces downtime due to malfunctions, and increases production efficiency.

[0045] In some embodiments, see Figure 1 A first delivery pump 7, a first regulating valve 36, and a first flow meter 34 are installed on the pipeline between the sulfuric acid storage tank 2 and the first pipeline mixer 14. A first pH meter 15 and a first thermometer 16 are installed on the pipeline between the first pipeline mixer 14 and the separation tower 4. The first pH meter 15 is linked with the first regulating valve 36. The opening degree of the first regulating valve 36 is controlled by the value displayed by the first pH meter 15.

[0046] The sulfuric acid used in this application is 93% sulfuric acid. The sulfuric acid is discharged from the sulfuric acid storage tank 2 and transported to the first pipeline mixer 14 by the first transfer pump 7. Inside the first pipeline mixer 14, it is mixed with the sodium phenylacetate aqueous solution. The consumption of 93% sulfuric acid is measured in real time by the first flow meter 34, and the feed rate of 93% sulfuric acid is controlled in real time by the first regulating valve 36. At the same time, the first regulating valve 36 and the first pH meter 15 are set up with a linkage control program. When the value displayed by the first pH meter 15 is higher than 2.0, the opening of the first regulating valve 36 needs to be increased in time. When the value displayed by the first pH meter 15 is lower than 1.5, the opening of the first regulating valve 36 needs to be decreased in time to ensure that the sodium phenylacetate solution is fully acidified and effectively converted into phenylacetic acid. Thus, the product quality of phenylacetic acid is guaranteed under the condition of minimal raw material consumption.

[0047] The working principle of the above embodiment is as follows: Sodium phenylacetate solution is introduced into the first pipeline mixer 14 by the second transfer pump 8, and sulfuric acid is introduced into the first pipeline mixer 14 by the first transfer pump 7. Inside the first pipeline mixer 14, sodium phenylacetate and sulfuric acid react and mix. The opening of the first regulating valve 36 is controlled by the value displayed by the first pH meter 15, so that the value displayed by the first pH meter 15 can always be maintained between 1.5 and 2.0. The material discharged from the first pipeline mixer 14 enters the interior of the oil-water coalescing membrane assembly 17 through the feed end of the separation tower 4. The oil-water coalescing membrane assembly 17 achieves effective separation of the phenylacetic acid oil phase and the sodium sulfate aqueous phase. At the same time, the opening of the fifth regulating valve 20 is adjusted in real time by the conductivity values ​​displayed by the first liquid-liquid interface meter 18 and the second liquid-liquid interface meter 19, thereby ensuring the stability of the continuous phase separation interface. The phenylacetic acid oil phase overflows from the upper end of the separation tower 4 into the oil phase receiving vessel 5, and the sodium sulfate aqueous phase is discharged from the lower end of the separation tower 4 into the aqueous phase receiving vessel 6. During the reaction, the heat generated is used to maintain the temperature of the entire system to prevent phenylacetic acid crystallization from clogging the separation system due to excessively low temperature. Therefore, the heat released during the reaction is beneficial to the smooth progress of the entire reaction process.

[0048] During the acidification process of sodium phenylacetate solution with sulfuric acid, the two react and mix inside the first pipeline mixer 14. The feed rate of sulfuric acid is adjusted by the value displayed by the first pH meter 15 so that the first pH meter 15 can always be maintained within the range of 1.5-2.0. In addition, since the melting point of phenylacetic acid is 76.5℃, when the temperature is below 55℃ during the acidification process of sodium phenylacetate solution with sulfuric acid, the phenylacetic acid oil phase will solidify and crystallize. Therefore, in order to avoid pipeline blockage, the value displayed by the first thermometer 16 needs to be controlled between 55-75℃.

[0049] In some embodiments, see Figure 1 A second delivery pump 8, a second flow meter 35, and a second regulating valve 37 are installed on the pipeline between the sodium phenylacetate storage tank 3 and the first pipeline mixer 14; the second flow meter 35 and the second regulating valve 37 are linked.

[0050] Sodium phenylacetate aqueous solution is discharged from sodium phenylacetate storage tank 3 and transported to the first pipeline mixer 14 by the second transfer pump 8. The total amount of sodium phenylacetate aqueous solution fed in real time is measured by the second flow meter 35, and the feed rate of sodium phenylacetate aqueous solution is controlled in real time by the opening of the second regulating valve 37 to maintain the stability of the entire separation system and the entire phenylacetic acid production system.

[0051] The apparatus provided in this application also includes a cleaning unit, which includes a high-temperature water storage tank 1 and a second pipeline mixer 11 connected by pipelines. The second pipeline mixer 11 is connected to a separation tower 4, an oil phase receiving vessel 5, and an aqueous phase receiving vessel 6 by pipelines. A third delivery pump 10, a fourth flow meter 30, and a fourth regulating valve 32 are installed on the pipeline between the high-temperature water storage tank 1 and the second pipeline mixer 11. A second pH meter 12 is installed on the pipeline between the second pipeline mixer 11 and the separation tower 4.

[0052] Installing a high-temperature water cleaning unit on the sodium phenylacetate acidification device allows for the cleaning of various pipelines with high-temperature water during equipment shutdown, preventing the solidification and crystallization of phenylacetic acid. This, in turn, avoids pipeline blockage caused by the solidification and crystallization of phenylacetic acid at low temperatures.

[0053] In some embodiments, see Figure 1 The second pipeline mixer 11 is connected to the pipeline between the separation tower 4 and the oil phase receiving vessel 5 via the first branch pipe; the second pipeline mixer 11 is connected to the pipeline between the separation tower 4 and the water phase receiving vessel 6 via the second branch pipe.

[0054] In some embodiments, see Figure 1 The first delivery pump 7 is connected to the second pipeline mixer 11 through a pipeline. A third flow meter 31 and a third regulating valve 33 are installed on the pipeline between the first delivery pump 7 and the second pipeline mixer 11. The third regulating valve 33 is linked with the second pH meter 12.

[0055] During the cleaning of the acidification separation device for sodium phenylacetate, high-temperature water is discharged from the high-temperature water storage tank 1 and transported to the interior of the second pipeline mixer 11 via the third transfer pump 10. At the same time, the opening of the third regulating valve 33 is adjusted according to the value displayed by the second pH meter 12, so that the pH value of the second pH meter 12 is always maintained between 1.5 and 2.0. Meanwhile, the consumption of high-temperature water and sulfuric acid is measured in real time by the values ​​displayed by the fourth flow meter 30 and the third flow meter 31 to prevent excessive water consumption and large amounts of wash water from entering the oil phase receiving vessel 5 and the aqueous phase receiving vessel 6, thereby adjusting the quality of the oil phase receiving vessel 5 and the aqueous phase receiving vessel 6.

[0056] In some embodiments, see Figure 1 An emergency pipeline 29 is installed between the bottom of the separation tower 4 and the top of the oil phase receiving vessel 5, and an emergency transfer pump 9 is installed on the emergency pipeline 29. During shutdown, due to the low-temperature solidification and crystallization properties of the material, it is necessary to discharge the material in the separation tower 4 and its corresponding pipelines in a timely manner, and clean the relevant units or pipelines.

[0057] Taking the emergency delivery pump 9 with a flow rate of 100 m³ / h as an example, the emergency working principle is explained as follows:

[0058] When the machine stops, the material inside the separation tower 4 is discharged to the oil phase receiving vessel 5 via the emergency transfer pump 9 on the emergency pipeline 29. The emergency transfer pump 9 is a 100 m³ / h centrifugal pump, which can completely discharge all the material inside the separation tower 4 within 15 minutes. At this time, the valves on the pipelines involved in the cleaning unit are opened, and the cleaning water in the high-temperature water storage tank 1 is transported from the top and bottom of the separation tower 4 to the interior of the separation tower 4 via the third transfer pump 10. The main body of the separation tower 4, the connecting pipeline between the separation tower 4 and the oil phase receiving vessel 5, the connecting pipeline between the separation tower 4 and the aqueous phase receiving vessel 6, and the emergency pipeline 29 are thoroughly flushed. Based on the value displayed by the second pH meter 12, the feed rate of sulfuric acid is adjusted in real time by adjusting the opening of the third regulating valve 33, thereby controlling the pH value of the cleaning water. The pH value of the cleaning water is maintained between 1.5 and 2.0 to prevent cleaning water with excessively low or high pH values ​​from entering the oil phase receiving vessel 5 and the aqueous phase receiving vessel 6, which would affect the quality of the phenylacetic acid oil phase and the sodium sulfate aqueous phase.

[0059] Based on the above embodiments, the continuous acidification and separation device for sodium phenylacetate provided by this utility model has the following advantages compared with the prior art:

[0060] First, by utilizing the oil-water coalescing membrane assembly 17 installed at the feed end of the separation tower 4, and in conjunction with the liquid-liquid interface meter installed at the top and bottom of the tower body and the fifth regulating valve 20 on the water phase separation pipeline for linkage control, the effective separation of the phenylacetic acid oil phase and the sodium sulfate water phase is achieved. This solves the technical problems such as unclear oil-water interface, water phase entrainment of oil phase or oil phase entrainment of water phase, low processing flow rate, and low degree of continuity during the continuous acidification process of sodium phenylacetate.

[0061] Second, the installation of a high-temperature cleaning unit can effectively solve the problem of pipeline blockage caused by the solidification and crystallization of phenylacetic acid material at low temperatures during shutdown.

[0062] Third, this utility model has a simple structure and involves few pieces of equipment (mainly including a high-temperature water storage tank 1, a sulfuric acid storage tank 2, a sodium phenylacetate storage tank 3, and a separation tower 4), making it easy to manufacture, disassemble, replace, and maintain. At the same time, interlocking control programs are set up in the processes of feeding, separation, and discharging, thereby realizing remote automatic control operation and greatly improving the production efficiency of phenylacetic acid.

[0063] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0064] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A continuous apparatus for acidifying and separating sodium phenylacetate, characterized by, include: The feeding unit, separation unit, and receiving unit are connected sequentially through pipelines; The feeding unit includes a sulfuric acid storage tank (2), a sodium phenylacetate storage tank (3), and a first pipeline mixer (14). The sulfuric acid storage tank (2) and the sodium phenylacetate storage tank (3) are respectively connected to the first pipeline mixer (14) through pipelines. The separation unit includes a separation tower (4), and an oil-water coalescing membrane assembly (17) is provided at the feed end of the separation tower (4); the first pipeline mixer (14) is connected to the oil-water coalescing membrane assembly (17) through a pipeline; The receiving unit includes an oil phase receiving vessel (5) and an aqueous phase receiving vessel (6); the oil phase pipeline at the top of the separation tower (4) is connected to the oil phase receiving vessel (5), and the aqueous phase pipeline at the bottom of the separation tower (4) is connected to the aqueous phase receiving vessel (6).

2. The sodium phenylacetate continuous acidification separation apparatus as described in claim 1, characterized in that, A first liquid-liquid interface device (18) is provided above the oil-water coalescing membrane assembly (17), and a second liquid-liquid interface device (19) is provided below the oil-water coalescing membrane assembly (17); a fifth regulating valve (20) and a fifth flow meter (38) are provided on the aqueous phase pipeline, and the first liquid-liquid interface device (18) and the second liquid-liquid interface device (19) are respectively linked with the fifth regulating valve (20).

3. The sodium phenylacetate continuous acidification separation apparatus as described in claim 1, characterized in that, The oil phase pipeline is an externally jacketed pipeline, and a second thermometer (13) is installed on the oil phase pipeline to detect the water temperature inside the jacket.

4. The sodium phenylacetate continuous acidification separation apparatus as described in claim 1, characterized in that, A first delivery pump (7), a first regulating valve (36), and a first flow meter (34) are installed on the pipeline between the sulfuric acid storage tank (2) and the first pipeline mixer (14). A first pH meter (15) and a first thermometer (16) are installed on the pipeline between the first pipeline mixer (14) and the separation tower (4). The first pH meter (15) is linked with the first regulating valve (36). The opening degree of the first regulating valve (36) is controlled by the value displayed by the first pH meter (15).

5. The sodium phenylacetate continuous acidification separation apparatus as described in claim 1, characterized in that, A second delivery pump (8), a second flow meter (35), and a second regulating valve (37) are installed on the pipeline between the sodium phenylacetate storage tank (3) and the first pipeline mixer (14); the second flow meter (35) and the second regulating valve (37) are linked.

6. The sodium phenylacetate continuous acidification separation apparatus as described in claim 4, characterized in that, It also includes a cleaning unit, which includes a high-temperature water storage tank (1) and a second pipeline mixer (11) connected by pipelines. The second pipeline mixer (11) is connected by pipelines to the separation tower (4), the oil phase receiving vessel (5) and the water phase receiving vessel (6) respectively. A third delivery pump (10), a fourth flow meter (30) and a fourth regulating valve (32) are installed on the pipeline between the high-temperature water storage tank (1) and the second pipeline mixer (11). A second pH meter (12) is installed on the pipeline between the second pipeline mixer (11) and the separation tower (4).

7. The sodium phenylacetate continuous acidification separation apparatus as described in claim 6, characterized in that, The second pipeline mixer (11) is connected to the pipeline between the separation tower (4) and the oil phase receiving vessel (5) via the first branch pipe; the second pipeline mixer (11) is connected to the pipeline between the separation tower (4) and the water phase receiving vessel (6) via the second branch pipe.

8. The sodium phenylacetate continuous acidification separation apparatus as described in claim 6, characterized in that, The first delivery pump (7) is connected to the second pipeline mixer (11) through a pipeline. A third flow meter (31) and a third regulating valve (33) are installed on the pipeline between the first delivery pump (7) and the second pipeline mixer (11). The third regulating valve (33) is linked with the second pH meter (12).

9. The sodium phenylacetate continuous acidification separation apparatus as described in claim 1, characterized in that, An emergency pipeline (29) is also provided between the bottom of the separation tower (4) and the top of the oil phase receiving vessel (5), and an emergency delivery pump (9) is provided on the emergency pipeline (29).

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