Agitated spray type crystallization apparatus and system for bisphenol a crystalline particle formation

Abstract

The utility model relates to be used for the stirring injection type crystallization device and system of bisphenol A crystalline particle formation, and the crystallization device includes crystallizer, stirring type injection mixer and mixed input pipeline, one end of mixed input pipeline is connected with the bottom of crystallizer and communicates, the other end of mixed input pipeline is the closed end and from the top of crystallizer stretches into the crystallizer, and the section of mixed input pipeline in the crystallizer is the connecting section, and the connecting section is arranged vertically and is fixed with a plurality of stirring type injection mixers, a plurality of stirring type injection mixers all communicate with the connecting section, and a plurality of stirring type injection mixers are sequentially spaced along the vertical direction and are all arranged to be inclined upwards. The utility model discloses a plurality of stirring type injection mixers are arranged in the crystallizer, and the effective mixing of bisphenol A solution and adduct crystalline body in the crystallizer is promoted through the special injection structure and the specific flow field arrangement, and then it is favorable to the formation of bisphenol A crystalline large particle.

Description

Technical Field

[0001] This utility model relates to the field of chemical technology, specifically to a stirring jet crystallization device and system for the formation of bisphenol A crystallized particles. Background Technology

[0002] Bisphenol A (BPA) is an important chemical raw material. During its production, the size of the crystal particles has a significant impact on subsequent processing, separation, and packaging. Larger BPA crystals offer better flowability, filterability, and stability, which helps improve production efficiency and product quality.

[0003] Traditional bisphenol A crystallizers use electric agitators to mix materials within the crystallizer. This method creates an uneven flow field within the crystallization container, leading to an unstable crystal growth environment and the formation of small or uneven crystals, which is detrimental to the stable formation of large crystals. Meanwhile, in continuously improving crystallizer designs, the use of crystallization sleeves to increase crystallization residence time has gradually replaced the intermediate agitator method. However, this method results in a larger crystallizer design and large crystals tend to settle at the bottom of the crystallizer, requiring frequent shutdowns for purging.

[0004] The invention patent with authorization announcement number CN1059428C discloses a method for manufacturing high-grade bisphenol A, including the following steps: a phenol evaporation step, in which phenol is removed by evaporation of the bisphenol A phenol crystallization adduct to obtain bisphenol A, a thin-film evaporator is used, the melt color of the bisphenol A phenol crystallization adduct is below 15 APHA, and the phenol solution containing bisphenol A formed by the crystallization adduct is evaporated at a temperature of 160~185°C and a pressure of 15~60 Torr to obtain bisphenol A with a phenol content of 1~5% by weight; a first desorption step, in which the phenol content is reduced to 170~ In the first desorption step, bisphenol A containing phenol obtained in the above phenol evaporation process is subjected to convective contact with a desorption gas at a temperature of 185°C and a pressure of 15 Torr or less for desorption treatment. In the second desorption step, bisphenol A containing phenol obtained in the first desorption step is subjected to convective contact with a desorption gas at a temperature of 170~185°C and a pressure of 15 Torr or less for desorption treatment. In the second subsequent step, steam is used as the desorption gas. In the first desorption step, the desorption gas is composed of steam containing phenol and bisphenol A obtained in the second desorption step.

[0005] Chinese patent application CN118950196A discloses a pneumatic dispersion method and apparatus for ultrafine powders. The apparatus includes a hopper, nozzles, an expansion tube, an impact plate, a separation chamber, and a powder feeding pipe. The nozzles, expansion tube, and impact plate are located on the same axis and arranged sequentially from the bottom to the top of the separation chamber. A gap is left at the connection between the nozzle and the expansion tube for powder feeding via the powder feeding pipe. One end of the powder feeding pipe is connected to the connection between the nozzle and the expansion tube, and the other end is connected to the hopper. The expansion tube has a reflux hole for returning undispersed ultrafine powders for further dispersion. This patent describes the pneumatic dispersion of ultrafine powders. Utility Model Content

[0006] In order to solve one or more technical problems existing in the prior art, this utility model provides a stirring spray type crystallization device and system for the formation of bisphenol A crystallization particles.

[0007] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: This utility model provides a stirring jet crystallization device for the formation of bisphenol A crystallized particles, including a crystallizer, a stirring jet mixer and a mixing input pipeline. One end of the mixing input pipeline is connected to and communicates with the bottom of the crystallizer, and the other end of the mixing input pipeline is a closed end that extends into the crystallizer from the top. A section of the mixing input pipeline located inside the crystallizer is a connecting section. The connecting section is arranged vertically and multiple stirring jet mixers are fixed on it. The multiple stirring jet mixers are all connected to the connecting section. The multiple stirring jet mixers are arranged sequentially at intervals along the vertical direction and are all inclined upwards.

[0008] The beneficial effects of this utility model are as follows: This utility model provides a stirring and spraying crystallization device for the formation of bisphenol A crystal particles. By setting multiple stirring and spraying mixers in the crystallizer, the stirring and spraying mixing method is applied to the bisphenol A crystallizer. Through a special spraying structure and a specific flow field arrangement, the effective mixing of the bisphenol A solution and the adduct crystals in the crystallizer is promoted, which is conducive to the formation of large bisphenol A crystal particles.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] Furthermore, the connecting segment is arranged close to the inner wall of the crystallizer and a gap is reserved between it and the inner wall of the crystallizer; the connecting segment is arranged parallel to the central axis of the crystallizer.

[0011] The advantages of adopting the above-mentioned further solution are: it is convenient to fix multiple stirring jet mixers in sequence along the vertical direction on the connecting section, and the mixing of solid and liquid phases is made more uniform by utilizing the multi-stage jet stirring effect and the negative pressure effect formed by the expansion tube in the stirring jet mixer.

[0012] Furthermore, the center of each of the circles containing the stirring jet mixers is located on the central axis of the crystallizer, and each stirring jet mixer is arranged inclined upward along the tangent direction of its circle.

[0013] The beneficial effect of adopting the above-mentioned further scheme is that each stirring jet mixer is arranged inclined upward along the tangent direction of its circle, so that the crude bisphenol sprayed into the crystallizer is mixed more evenly with the crude bisphenol in the crystallizer.

[0014] Furthermore, all stirring jet mixers have the same tilt direction, or two adjacent stirring jet mixers have different tilt directions.

[0015] Furthermore, the stirring jet mixer includes a flow tube, an expansion tube, and a nozzle. Both ends of the flow tube are constricted structures. The nozzle is fixed inside the constricted structure at one end of the flow tube and communicates with the inner cavity of the flow tube. The small end of the expansion tube is fixedly connected to the constricted structure at the other end of the flow tube. A flow hole communicating with the inner cavity is provided on the flow tube.

[0016] The beneficial effects of adopting the above-mentioned further scheme are as follows: The stirring jet mixer, by setting up a flow pipe, an expansion pipe and a nozzle, can spray the bisphenol A adduct crystals (solid-liquid two phases) into the expansion pipe through the nozzle. Under the negative pressure effect formed by the expansion pipe, the crude bisphenol (liquid phase) in the crystallizer is drawn into the inner cavity of the flow pipe through the flow hole and effectively mixed with the bisphenol A adduct crystals (solid-liquid two phases). The negative pressure effect of the expansion pipe makes the solid-liquid two phases more uniformly mixed.

[0017] Furthermore, the flow tube, expansion tube, and nozzle are arranged coaxially.

[0018] Furthermore, the number of stirring-type jet mixers on the connecting section is 2 to 8.

[0019] Furthermore, a discharge pump is installed on a section of the mixing input pipeline located outside the crystallizer, and a first flow regulating valve is installed on the mixing input pipeline between the discharge pump and the crystallizer; a level gauge is installed on the crystallizer.

[0020] This utility model also provides a stirring jet crystallization system for the formation of bisphenol A crystal particles, including the stirring jet crystallization device for the formation of bisphenol A crystal particles as described above, and further including a circulating cooling pipeline. One end of the circulating cooling pipeline extends into the crystallizer and communicates with the interior of the crystallizer, and the other end of the circulating cooling pipeline is connected to and communicates with the mixing input pipeline. The circulating cooling pipeline is provided with a circulating pump, a crystallization circulating cooler, and a second flow regulating valve.

[0021] The beneficial effects of this utility model are as follows: The stirring and spraying crystallization system of this utility model for the formation of bisphenol A crystallized particles can effectively promote the formation of large particles in the crystallizer of the bisphenol A device, thereby improving the dehydration and washing efficiency of the subsequent bisphenol A product, increasing product purity, reducing organic impurities, improving solid-liquid separation effect, increasing the crystallization rate of the crystallizer, reducing the crystallizer size, reducing the flow rate of the crystallizer circulation pump, eliminating the safety hazards caused by this, reducing the operation and maintenance costs of the device, and improving the production efficiency of the device.

[0022] Furthermore, a raw material input pipe is connected to the downstream circulating cooling pipeline of the crystallization circulating cooler, and a crystallization mixture output pipeline is connected to the mixing input pipeline. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the stirring-jet crystallization system for the formation of bisphenol A crystallized particles according to this invention. Figure 2 This is a schematic diagram of the structure of the stirring jet mixer of this utility model.

[0024] The attached diagram lists the components represented by each number as follows: 1. Crystallizer; 11. Level gauge; 2. Stirring-type jet mixer; 21. Flow pipe; 22. Expansion pipe; 23. Nozzle; 24. Flow hole; 3. Mixing input pipeline; 31. Connecting section; 32. Discharge pump; 33. First flow regulating valve; 4. Circulating cooling pipeline; 41. Circulating pump; 42. Crystallization circulating cooler; 43. Second flow regulating valve; 5. Crystallization mixture output pipeline; 51. Third flow regulating valve; 6. Raw material input pipe. Detailed Implementation

[0025] The principles and features of this utility model are described below. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0026] Example 1 like Figure 1 and Figure 2As shown, this embodiment of a stirring jet crystallization device for forming bisphenol A crystallized particles includes a crystallizer 1, a stirring jet mixer 2, and a mixing input line 3. One end of the mixing input line 3 is connected to and communicates with the bottom of the crystallizer 1, and the other end of the mixing input line 3 is a closed end that extends into the crystallizer 1 from the top. The section of the mixing input line 3 located inside the crystallizer 1 is a connecting section 31. The connecting section 31 is vertically arranged and a plurality of stirring jet mixers 2 are fixed thereon. The plurality of stirring jet mixers 2 are all communicated with the connecting section 31, and the plurality of stirring jet mixers 2 are arranged sequentially at intervals along the vertical direction and are all inclined upwards.

[0027] like Figure 1 As shown, in one specific embodiment, the connecting section 31 is arranged close to the inner wall of the crystallizer 1 and a gap is reserved between it and the inner wall of the crystallizer 1; the connecting section 31 is arranged parallel to the central axis of the crystallizer 1. This facilitates the sequential fixing of multiple stirring jet mixers vertically onto the connecting section, utilizing the multi-stage jet stirring effect and the negative pressure effect formed by the expansion tube in the stirring jet mixer to make the solid-liquid two-phase mixing more uniform.

[0028] like Figure 1 As shown, optionally, the number of stirring-type jet mixers 2 on the connecting section 31 is 2 to 8, preferably 3 to 6, for example, 2, 3, 4, 5, 6, 7, 8, etc. can be selected.

[0029] The crystallizer 1 in this embodiment can adopt the crystallizer structure commonly used in existing bisphenol A crystallization.

[0030] This embodiment provides a preferred arrangement of the stirring jet mixer 2, such as... Figure 1 As shown, all stirring jet mixers 2 have the same tilt direction, for example, they all face the same side; or the tilt directions of two adjacent stirring jet mixers are different, that is, the tilt directions of two adjacent stirring jet mixers are different.

[0031] This embodiment provides a stirring-jet crystallization device for the formation of bisphenol A crystallized particles. By setting multiple stirring-jet mixers in the crystallizer, the stirring-jet mixing method is applied to the bisphenol A crystallizer. Through a special jet structure and a specific flow field arrangement, the effective mixing of the bisphenol A solution and the adduct crystals in the crystallizer is promoted, which is conducive to the formation of large bisphenol A crystallized particles.

[0032] Example 2 like Figure 1 and Figure 2As shown, this embodiment of a stirring jet crystallization device for forming bisphenol A crystallized particles includes a crystallizer 1, a stirring jet mixer 2, and a mixing input line 3. One end of the mixing input line 3 is connected to and communicates with the bottom of the crystallizer 1, and the other end of the mixing input line 3 is a closed end that extends into the crystallizer 1 from the top. The section of the mixing input line 3 located inside the crystallizer 1 is a connecting section 31. The connecting section 31 is vertically arranged and a plurality of stirring jet mixers 2 are fixed thereon. The plurality of stirring jet mixers 2 are all communicated with the connecting section 31, and the plurality of stirring jet mixers 2 are arranged sequentially at intervals along the vertical direction and are all inclined upwards.

[0033] like Figure 1 As shown, in one specific embodiment, the connecting section 31 is arranged close to the inner wall of the crystallizer 1 and a gap is reserved between it and the inner wall of the crystallizer 1; the connecting section 31 is arranged parallel to the central axis of the crystallizer 1. This facilitates the sequential fixing of multiple stirring jet mixers vertically onto the connecting section, utilizing the multi-stage jet stirring effect and the negative pressure effect formed by the expansion tube in the stirring jet mixer to make the solid-liquid two-phase mixing more uniform.

[0034] like Figure 1 As shown, optionally, the number of stirring-type jet mixers 2 on the connecting section 31 is 2 to 8, preferably 3 to 6, for example, 2, 3, 4, 5, 6, 7, 8, etc. can be selected.

[0035] The crystallizer 1 in this embodiment can adopt the crystallizer structure commonly used in existing bisphenol A crystallization.

[0036] like Figure 1 As shown, the center of each circle containing the stirring jet mixer 2 is located on the central axis of the crystallizer 1, and each stirring jet mixer 2 is arranged inclined upwards along the tangent direction of its circle. This arrangement ensures a more uniform mixing of the crude bisphenol sprayed into the crystallizer. In this embodiment, the upward tilt angle of the stirring jet mixer can be set as needed.

[0037] This embodiment provides a preferred arrangement of the stirring jet mixer 2, such as... Figure 1 As shown, all stirring jet mixers 2 have the same tilt direction, for example, they all face the same side; or the tilt directions of two adjacent stirring jet mixers are different, that is, the tilt directions of two adjacent stirring jet mixers are different.

[0038] Example 3 like Figure 1 and Figure 2As shown, this embodiment of a stirring jet crystallization device for forming bisphenol A crystallized particles includes a crystallizer 1, a stirring jet mixer 2, and a mixing input line 3. One end of the mixing input line 3 is connected to and communicates with the bottom of the crystallizer 1, and the other end of the mixing input line 3 is a closed end that extends into the crystallizer 1 from the top. The section of the mixing input line 3 located inside the crystallizer 1 is a connecting section 31. The connecting section 31 is vertically arranged and a plurality of stirring jet mixers 2 are fixed thereon. The plurality of stirring jet mixers 2 are all communicated with the connecting section 31, and the plurality of stirring jet mixers 2 are arranged sequentially at intervals along the vertical direction and are all inclined upwards.

[0039] like Figure 1 As shown, in one specific embodiment, the connecting section 31 is arranged close to the inner wall of the crystallizer 1 and a gap is reserved between it and the inner wall of the crystallizer 1; the connecting section 31 is arranged parallel to the central axis of the crystallizer 1. This facilitates the sequential fixing of multiple stirring jet mixers vertically onto the connecting section, utilizing the multi-stage jet stirring effect and the negative pressure effect formed by the expansion tube in the stirring jet mixer to make the solid-liquid two-phase mixing more uniform.

[0040] like Figure 1 As shown, optionally, the number of stirring-type jet mixers 2 on the connecting section 31 is 2 to 8, preferably 3 to 6, for example, 2, 3, 4, 5, 6, 7, 8, etc. can be selected.

[0041] The crystallizer 1 in this embodiment can adopt the crystallizer structure commonly used in existing bisphenol A crystallization.

[0042] like Figure 1 As shown, the center of each circle containing the stirring jet mixer 2 is located on the central axis of the crystallizer 1, and each stirring jet mixer 2 is arranged inclined upwards along the tangent direction of its circle. This arrangement ensures a more uniform mixing of the crude bisphenol sprayed into the crystallizer. In this embodiment, the upward tilt angle of the stirring jet mixer can be set as needed.

[0043] This embodiment provides a preferred arrangement of the stirring jet mixer 2, such as... Figure 1 As shown, all stirring jet mixers 2 have the same tilt direction, for example, they all face the same side; or the tilt directions of two adjacent stirring jet mixers are different, that is, the tilt directions of two adjacent stirring jet mixers are different.

[0044] This embodiment provides a preferred structure for a stirring-type jet mixer 2, such as... Figure 2As shown, the stirring jet mixer 2 includes a flow pipe 21, an expansion pipe 22, and a nozzle 23. Both ends of the flow pipe 21 are constricted structures. The nozzle 23 is fixed inside the constricted structure at one end of the flow pipe 21 and communicates with the inner cavity of the flow pipe 21. The small end of the expansion pipe 22 is fixedly connected to the constricted structure at the other end of the flow pipe 21. A flow hole 24 communicating with the inner cavity is provided on the flow pipe 21. By setting the flow pipe, expansion pipe, and nozzle, the stirring jet mixer can spray bisphenol A adduct crystals (solid-liquid two phases) into the expansion pipe through the nozzle. Under the negative pressure effect formed by the expansion pipe, the crude bisphenol (liquid phase) in the crystallizer is drawn into the inner cavity of the flow pipe through the flow hole and effectively mixed with the bisphenol A adduct crystals (solid-liquid two phases). The negative pressure effect of the expansion pipe makes the solid-liquid two-phase mixing more uniform.

[0045] More preferably, the flow tube 21, the expansion tube 22 and the nozzle 23 are arranged coaxially.

[0046] Specifically, such as Figure 2 As shown, the flow tube 21 in this embodiment includes a first conical tube, a cylindrical tube, and a second conical tube integrally connected in sequence. The large end of the first conical tube is coaxially and fixedly connected to one end of the cylindrical tube, and the large end of the second conical tube is coaxially and fixedly connected to the other end of the cylindrical tube. The small end of the first conical tube is fixedly connected to the small end of the expansion tube 22. The nozzle 23 is fixedly installed inside the second conical tube. The small end of the second conical tube is connected and communicates with the connecting section 31. The nozzle 23 in this embodiment can be a commonly used nozzle for liquid or powder spraying. The flow holes 24 can be specifically opened on the cylindrical tube, and the number of openings can be set according to actual needs. When multiple flow holes are opened on the cylindrical tube, the multiple flow holes can be evenly arranged along the circumference of the cylindrical tube.

[0047] In this embodiment, the mixing effect can be enhanced by using a stirring jet mixer. The throat diameter and expansion angle of the nozzle are increased based on the conventional nozzle to prevent solid phase blockage and enhance the negative pressure effect of the mixed phase after flowing out of the throat, thereby enhancing the mixing effect. Moreover, the stirring jet mixer is designed in multiple stages according to the distribution of crystal slurry in the crystallizer, so that the mixing is more uniform and the standard deviation of concentration distribution is reduced.

[0048] This embodiment adds a method to the conventional bisphenol A static crystallizer by using an ejector to achieve stirring within the crystallizer, thereby increasing the tendency for large crystal particles to form.

[0049] In this embodiment, the stirring jet mixer is used such that the solid and liquid phases of the bisphenol A solution are injected into the expansion tube from the inlet nozzle, creating a negative pressure effect inside the expansion tube. The bisphenol A solution in the crystallizer is then drawn into the inner cavity of the flow tube. The drawn-in liquid phase is uniformly mixed with the solid and liquid phases inside the expansion tube and then injected into the crystallizer.

[0050] Example 4 like Figure 1 and Figure 2 As shown, this embodiment of a stirring jet crystallization device for forming bisphenol A crystallized particles includes a crystallizer 1, a stirring jet mixer 2, and a mixing input line 3. One end of the mixing input line 3 is connected to and communicates with the bottom of the crystallizer 1, and the other end of the mixing input line 3 is a closed end that extends into the crystallizer 1 from the top. The section of the mixing input line 3 located inside the crystallizer 1 is a connecting section 31. The connecting section 31 is vertically arranged and a plurality of stirring jet mixers 2 are fixed thereon. The plurality of stirring jet mixers 2 are all communicated with the connecting section 31, and the plurality of stirring jet mixers 2 are arranged sequentially at intervals along the vertical direction and are all inclined upwards.

[0051] like Figure 1 As shown, in one specific embodiment, the connecting section 31 is arranged close to the inner wall of the crystallizer 1 and a gap is reserved between it and the inner wall of the crystallizer 1; the connecting section 31 is arranged parallel to the central axis of the crystallizer 1. This facilitates the sequential fixing of multiple stirring jet mixers vertically onto the connecting section, utilizing the multi-stage jet stirring effect and the negative pressure effect formed by the expansion tube in the stirring jet mixer to make the solid-liquid two-phase mixing more uniform.

[0052] like Figure 1 As shown, optionally, the number of stirring-type jet mixers 2 on the connecting section 31 is 2 to 8, preferably 3 to 6, for example, 2, 3, 4, 5, 6, 7, 8, etc. can be selected.

[0053] The crystallizer 1 in this embodiment can adopt the crystallizer structure commonly used in existing bisphenol A crystallization.

[0054] like Figure 1 As shown, the center of each circle containing the stirring jet mixer 2 is located on the central axis of the crystallizer 1, and each stirring jet mixer 2 is arranged inclined upwards along the tangent direction of its circle. This arrangement ensures a more uniform mixing of the crude bisphenol sprayed into the crystallizer. In this embodiment, the upward tilt angle of the stirring jet mixer can be set as needed.

[0055] This embodiment provides a preferred arrangement of the stirring jet mixer 2, such as... Figure 1 As shown, all stirring jet mixers 2 have the same tilt direction, for example, they all face the same side; or the tilt directions of two adjacent stirring jet mixers are different, that is, the tilt directions of two adjacent stirring jet mixers are different.

[0056] This embodiment provides a preferred structure for a stirring-type jet mixer 2, such as... Figure 2 As shown, the stirring jet mixer 2 includes a flow pipe 21, an expansion pipe 22, and a nozzle 23. Both ends of the flow pipe 21 are constricted structures. The nozzle 23 is fixed inside the constricted structure at one end of the flow pipe 21 and communicates with the inner cavity of the flow pipe 21. The small end of the expansion pipe 22 is fixedly connected to the constricted structure at the other end of the flow pipe 21. A flow hole 24 communicating with the inner cavity is provided on the flow pipe 21. By setting the flow pipe, expansion pipe, and nozzle, the stirring jet mixer can spray bisphenol A adduct crystals (solid-liquid two phases) into the expansion pipe through the nozzle. Under the negative pressure effect formed by the expansion pipe, the crude bisphenol (liquid phase) in the crystallizer is drawn into the inner cavity of the flow pipe through the flow hole and effectively mixed with the bisphenol A adduct crystals (solid-liquid two phases). The negative pressure effect of the expansion pipe makes the solid-liquid two-phase mixing more uniform.

[0057] More preferably, the flow tube 21, the expansion tube 22 and the nozzle 23 are arranged coaxially.

[0058] Specifically, such as Figure 2 As shown, the flow tube 21 in this embodiment includes a first conical tube, a cylindrical tube, and a second conical tube integrally connected in sequence. The large end of the first conical tube is coaxially and fixedly connected to one end of the cylindrical tube, and the large end of the second conical tube is coaxially and fixedly connected to the other end of the cylindrical tube. The small end of the first conical tube is fixedly connected to the small end of the expansion tube 22. The nozzle 23 is fixedly installed inside the second conical tube. The small end of the second conical tube is connected and communicates with the connecting section 31. The nozzle 23 in this embodiment can be a commonly used nozzle for liquid or powder spraying. The flow holes 24 can be specifically opened on the cylindrical tube, and the number of openings can be set according to actual needs. When multiple flow holes are opened on the cylindrical tube, the multiple flow holes can be evenly arranged along the circumference of the cylindrical tube.

[0059] In this embodiment, the mixing effect can be enhanced by using a stirring jet mixer. The throat diameter and expansion angle of the nozzle are increased based on the conventional nozzle to prevent solid phase blockage and enhance the negative pressure effect of the mixed phase after flowing out of the throat, thereby enhancing the mixing effect. Moreover, the stirring jet mixer is designed in multiple stages according to the distribution of crystal slurry in the crystallizer, so that the mixing is more uniform and the standard deviation of concentration distribution is reduced.

[0060] This embodiment adds a method to the conventional bisphenol A static crystallizer by using an ejector to achieve stirring within the crystallizer, thereby increasing the tendency for large crystal particles to form.

[0061] In this embodiment, the stirring jet mixer is used such that the solid and liquid phases of the bisphenol A solution are injected into the expansion tube from the inlet nozzle, creating a negative pressure effect inside the expansion tube. The bisphenol A solution in the crystallizer is then drawn into the inner cavity of the flow tube. The drawn-in liquid phase is uniformly mixed with the solid and liquid phases inside the expansion tube and then injected into the crystallizer.

[0062] This embodiment provides a preferred solution for the hybrid input pipeline 3. For example... Figure 1 As shown, a discharge pump 32 is provided on a section of the mixing input pipeline 3 located outside the crystallizer 1, and a first flow regulating valve 33 is provided on the mixing input pipeline 3 between the discharge pump 32 and the crystallizer 1; a level gauge 11 is provided on the crystallizer 1.

[0063] Specifically, such as Figure 1 As shown, the first flow regulating valve 33 is located between the discharge pump 32 and the top of the crystallizer 1. The level gauge 11, the discharge pump 32, and the first flow regulating valve 33 can all be commonly used equipment in bisphenol A crystallization systems. Among them, the level gauge 11 is mainly used to regulate the liquid level in the crystallizer 1. The level gauge 11 can be used in conjunction with the third flow regulating valve 51 on the crystallization mixture output pipeline 5 to control the liquid level in the crystallizer 1 by controlling the flow rate of the crystallization mixture in the crystallization mixture output pipeline 5.

[0064] Example 5 This embodiment provides a stirring jet crystallization system for forming bisphenol A crystal particles, including the stirring jet crystallization device for forming bisphenol A crystal particles as described in any of the above embodiments, and also includes a circulating cooling pipeline 4. One end of the circulating cooling pipeline 4 extends into the crystallizer 1 and communicates with the interior of the crystallizer 1. The other end of the circulating cooling pipeline 4 is connected to and communicates with the mixing input pipeline 3. The circulating cooling pipeline 4 is equipped with a circulating pump 41, a crystallization circulating cooler 42, and a second flow regulating valve 43.

[0065] like Figure 1 As shown, in a specific embodiment, a raw material input pipe 6 is connected to the circulating cooling pipeline 4 downstream of the crystallization circulating cooler 42, and a crystallization mixture output pipeline 5 is connected to the mixing input pipeline 3.

[0066] Specifically, such as Figure 1 As shown, a third flow regulating valve 51 is installed on the raw material input pipe 6 in this embodiment. The third flow regulating valve 51 can be used in conjunction with the level gauge 11 on the crystallizer 1 to regulate the output.

[0067] In this embodiment, the crystallization circulation cooler 42 is used to cool down the material in the crystallizer and mix it with the bisphenol A input through the raw material input pipe 6. The mixture is then input into the crystallizer.

[0068] The crystallization circulation cooler 42 can cool the material in the crystallizer to 40~60℃, specifically 40℃, 41℃, 42℃, 43℃, 44℃, 45℃, 46℃, 47℃, 48℃, 49℃, 50℃, 51℃, 52℃, 53℃, 54℃, 55℃, 56℃, 57℃, 58℃, 59℃, and 60℃.

[0069] In this embodiment, the second flow regulating valve 43 and the third flow regulating valve 51 can be flow regulating valves commonly used in bisphenol A crystallization systems. The crystallization circulation cooler 42 can be a circulation cooler commonly used in bisphenol A crystallization systems.

[0070] Specifically, such as Figure 1 As shown, in this embodiment, the circulating pump 41 is located upstream of the crystallization circulating cooler 42, and the raw material input pipe 6 is located downstream of the crystallization circulating cooler 42. The crystallization mixture output line 5 is located on the mixing input line 3 between the first flow regulating valve 33 and the discharge pump 32.

[0071] In this embodiment, the stirred jet crystallization system for forming bisphenol A (BPA) crystal particles is used such that the crude BPA solution sprayed into the crystallizer 1 by the nozzle 23 enters the crystallizer 1. The material in the crystallizer 1 is drawn out by the circulating pump 41 for circulation and cooling. After being cooled by the crystallization circulation cooler 42, it returns to the crystallizer 1, and the temperature in the crystallizer 1 is controlled at 40~60℃. The material gradually forms BPA crystals from bottom to top in the crystallizer 1 and then enters the inner sleeve. After staying for a sufficient time, a portion of the formed BPA slurry is returned to the crystallizer 1 by the discharge pump 32 of the crystallizer 1. It is then mixed and sprayed by multiple stirred jet mixers 2 arranged according to fluid dynamics. A flow control system (first flow regulating valve 33, second flow regulating valve 43 and third flow regulating valve 51) is set up to regulate the number of times the BPA slurry circulates through the stirred jet mixers 2. The other portion of the BPA slurry is sent to the subsequent separation process.

[0072] The stirring-jet crystallization system of this embodiment for the formation of bisphenol A crystallized particles can effectively promote the formation of large particles in the crystallizer of the bisphenol A unit, thereby improving the dehydration and washing efficiency of the subsequent bisphenol A product, increasing product purity, reducing organic impurities, improving solid-liquid separation effect, increasing the crystallization rate of the crystallizer, reducing the crystallizer size, reducing the flow rate of the crystallizer circulation pump, eliminating the safety hazards caused by it, reducing the operation and maintenance costs of the unit, and improving the production efficiency of the unit.

[0073] Test case For an existing bisphenol A crystallizer, the stirred jet crystallization system for bisphenol A crystallization particle formation of Example 5 (including the crystallization device of Example 4) is used, and the circulation pump flow rate of the crystallizer is 1500 m³ / s. 3 / h, the flow rate of the crystallizer's discharge pump is 80m³ / h. 3 The crystallizer has a size of Φ2000×10000mm. Under the original design, the crystal concentration at the crystallizer outlet (i.e., the crystals output from the crystallization mixture output pipeline) is 3%~5%, the concentration of large crystal particles (425μm~1200μm) is 60%~70%, and the standard deviation of the concentration distribution is 30%. After applying this invention, 3~6 stirring-type jet mixers are installed at different elevations within the crystallizer, increasing the discharge pump flow rate to 150m³ / h. 3 / h, reduce the circulation pump flow rate to 1000m³ / h. 3 / h, with the crystallizer size remaining constant, the crystal concentration at the crystallizer outlet accounts for 4%~6%, the concentration of large crystal particles (425~1200μm) accounts for 80%~90%, and the standard deviation of the concentration distribution is no greater than 10%.

[0074] In the description of this utility model, it should be understood that the terms "center", "vertical", "top", "bottom", "inner", "outer", "radial", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0075] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0076] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0077] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0079] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A stirring-jet type crystallizer for forming bisphenol A crystal particles, characterized in that, The system includes a crystallizer, a stirring jet mixer, and a mixing input pipeline. One end of the mixing input pipeline is connected to and communicates with the bottom of the crystallizer, and the other end of the mixing input pipeline is a closed end that extends into the crystallizer from the top. A section of the mixing input pipeline located inside the crystallizer is a connecting section. The connecting section is vertically arranged and has multiple stirring jet mixers fixed on it. All of the multiple stirring jet mixers are connected to the connecting section. The multiple stirring jet mixers are arranged sequentially at intervals along the vertical direction and are all inclined upwards.

2. The stirred jet crystallizer for forming bisphenol A crystallized particles according to claim 1, characterized in that, The connecting segment is arranged close to the inner wall of the crystallizer and a gap is reserved between it and the inner wall of the crystallizer; the connecting segment is arranged parallel to the central axis of the crystallizer.

3. The stirred jet crystallizer for forming bisphenol A crystallized particles according to claim 2, characterized in that, The center of each of the circles containing the stirring jet mixers is located on the central axis of the crystallizer, and each stirring jet mixer is arranged inclined upward along the tangent direction of its circle.

4. The stirred jet crystallizer for forming bisphenol A crystallized particles according to any one of claims 1 to 3, characterized in that, All stirring jet mixers are tilted in the same direction, or two adjacent stirring jet mixers are tilted in different directions.

5. The stirred jet crystallizer for forming bisphenol A crystallized particles according to any one of claims 1 to 3, characterized in that, The stirring jet mixer includes a flow tube, an expansion tube, and a nozzle. Both ends of the flow tube are constricted structures. The nozzle is fixed inside the constricted structure at one end of the flow tube and communicates with the inner cavity of the flow tube. The small end of the expansion tube is fixedly connected to the constricted structure at the other end of the flow tube. A flow hole communicating with the inner cavity is provided on the flow tube.

6. The stirred jet crystallizer for forming bisphenol A crystallized particles according to claim 5, characterized in that, The flow tube, expansion tube, and nozzle are arranged coaxially.

7. The stirred jet crystallizer for forming bisphenol A crystallized particles according to any one of claims 1 to 3, characterized in that, The number of stirring-type jet mixers on the connecting section is 2 to 8.

8. The stirred jet crystallizer for forming bisphenol A crystallized particles according to any one of claims 1 to 3, characterized in that, A discharge pump is installed on a section of the mixing input pipeline located outside the crystallizer, and a first flow regulating valve is installed on the mixing input pipeline between the discharge pump and the crystallizer; a level gauge is installed on the crystallizer.

9. A stirring-jet crystallization system for forming bisphenol A crystal particles, characterized in that, The device includes a stirring jet crystallizer for forming bisphenol A crystal particles as described in any one of claims 1 to 8, and further includes a circulating cooling pipeline, one end of which extends into the crystallizer and communicates with the interior of the crystallizer, and the other end of which is connected to and communicates with the mixing input pipeline. The circulating cooling pipeline is provided with a circulating pump, a crystallization circulating cooler, and a second flow regulating valve.

10. The stirred jet crystallization system for forming bisphenol A crystallized particles according to claim 9, characterized in that, A raw material input pipe is connected to the downstream circulating cooling pipeline of the crystallization circulating cooler, and a crystallization mixture output pipeline is connected to the mixing input pipeline.

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