Crystallizer

Abstract

The utility model provides a crystallizer. The crystallizer comprises an inner barrel, an outer barrel, a sealing cover and a driving device. The outer cylinder and the inner cylinder are coaxially arranged, and the diameter of the inner wall of the outer cylinder is larger than that of the outer wall of the inner cylinder; the sealing cover is connected with the outer cylinder body and forms a closed space with the outer cylinder body; and the driving device penetrates through the sealing cover, is connected with the inner cylinder body and is used for driving the inner cylinder body to rotate. The crystallizer is composed of an inner cylinder and an outer cylinder which are coaxial, a unique periodic flow pattern is generated through rotation induction of the inner cylinder, the periodic flow pattern has uniform and strong fluid shear and high mass transfer rate, a uniform, good and stable crystallization environment can be provided, and the processes of crystal nucleation, growth, agglomeration and the like in crystallization are promoted. In addition, the temperature of the inner and outer cylinders can be independently controlled, so that space temperature gradient can be formed between the surfaces of the inner and outer cylinders of the crystallizer equipment, namely a periodic fluid generation space, important crystallization processes such as crystal curing and phase inversion are promoted, and the quality of crystallized products is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of crystallization, and relates to a crystallizer, in particular to a crystallizer capable of generating periodic Taylor vortex fluid and spatial temperature gradient. Background Art

[0002] Crystallization is a key unit operation for separation, purification, and particle / powder synthesis, widely used in a variety of industries, including fine chemicals, petrochemicals, pharmaceuticals, and powders. Each step in crystallization, such as nucleation, growth, aggregation / fragmentation, and phase transition, directly determines the properties of the crystalline product, including crystal size, distribution, morphology, structure, and purity. Fluid dynamics are considered one of the most important parameters influencing the crystallization process (nucleation, growth, aggregation / fragmentation, and phase transition). It is well known that primary nucleation is sometimes stimulated by fluid motion, and fluid shear can also promote secondary nucleation. The mass transfer process during crystal growth is directly controlled by the fluid motion of the suspension. Crystal collisions, agglomeration, and redispersion / fragmentation are all influenced by shear in fluid dynamics. However, the fluid dynamics in typical crystallizers utilize a stirred flow generated by an agitator / propeller, also known as random turbulent eddies. This random turbulent eddy motion is disordered and irregular, with stagnation zones or stirring dead zones, resulting in uneven medium mixing and low mass transfer rates, making the crystallization process random and difficult to control. For example, the nucleation time is long or the nucleation point is difficult to predict. The properties of the obtained crystal products, such as the crystal form, purity, morphology, size and size distribution, are seriously affected and difficult to control. This leads to many problems such as wide size distribution, many fine crystals, and difficulty in downstream separation and drying.

[0003] In order to solve the problems existing in the prior art, it is very necessary to develop a new type of crystallizer. Utility Model Content

[0004] In response to the shortcomings of the prior art, the present invention aims to provide a crystallizer comprising coaxial inner and outer cylinders. The inner cylinder's rotation induces a unique periodic flow pattern, which exhibits uniform and intense fluid shear and a high mass transfer rate. This periodic flow pattern provides a uniformly mixed, well-balanced, and stable crystallization environment, promoting processes such as crystal nucleation, growth, and agglomeration. Furthermore, by utilizing the crystallizer's unique dual-cylinder structure and designing temperature-controlled jackets for the inner and outer cylinders, and by connecting each of the inner and outer cylinders to independent temperature-control equipment, a spatial temperature gradient can be formed between the surfaces of the inner and outer cylinders of the crystallizer equipment, i.e., the space where the periodic flow is generated. This promotes important crystallization processes such as crystal maturation and phase transformation, thereby improving the quality of the crystallized product.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] The utility model provides a crystallizer, which comprises an inner cylinder, an outer cylinder, a sealing cover and a driving device;

[0007] The outer cylinder and the inner cylinder are coaxially arranged, and the inner wall diameter of the outer cylinder is larger than the outer wall diameter of the inner cylinder;

[0008] The sealing cover is connected to the outer cylinder to form a closed space with the outside world;

[0009] The driving device passes through the sealing cover and is connected to the inner cylinder, and is used for driving the inner cylinder to rotate.

[0010] In this application, the crystallizer is composed of coaxial inner and outer double cylinders, and the rotation of the inner cylinder induces the generation of a unique Taylor vortex periodic fluid. This periodic flow pattern has uniform and strong fluid shear and high mass transfer rate, which can provide a uniformly mixed, good and stable crystallization environment, and promote the processes of crystal nucleation, growth and agglomeration during crystallization.

[0011] In this application, there is no specific limitation on the material of the inner cylinder and the outer cylinder. Those skilled in the art can select materials such as glass, stainless steel, polytetrafluoroethylene, etc. according to the selected material system and solvent type. The outer diameter of the inner cylinder is smaller than the inner diameter of the outer cylinder, so that a gap exists between the inner cylinder and the outer cylinder. When the crystallizer is working, the driving device drives the inner cylinder to rotate, so that a periodic Taylor vortex fluid is generated in the gap between the inner cylinder and the outer cylinder. In this application, there is no specific limitation on the outer diameter of the inner cylinder and the inner diameter of the outer cylinder. Those skilled in the art can select materials according to actual needs (such as the demand for the shear force of the fluid, the scale of the crystallizer, etc.). Preferably, the ratio of the outer diameter of the inner cylinder to the inner diameter of the outer cylinder is (0.25-1):1, preferably 0.25:1, 0.3:1, 0.4:1, 0.5:1, 0.6:1, 0.7:1, 0.8:1, 0.9:1, 1:1, etc.

[0012] In this application, the purpose of the sealing cap is to form a sealed space between the inner and outer cylinders, allowing the material to form a continuous periodic fluid motion within the sealed and stable working space, ensuring that the crystallization process is as unaffected or minimally affected by external factors as possible, thereby ensuring the smooth progress of the crystallization process. This application does not specifically limit the material of the sealing cap. Persons skilled in the art may define it based on the actual material system and solvent type, such as glass, stainless steel, polytetrafluoroethylene, etc.

[0013] When the crystallizer is working, the driving device passes through the sealing cover and is connected to the inner cylinder, driving the inner cylinder to rotate, and a periodic Taylor vortex fluid is generated in the gap between the rotating inner cylinder and the outer cylinder.

[0014] Preferably, the side wall of the outer cylinder is a sandwich structure, or a jacket structure is circumferentially arranged around the side wall of the outer cylinder; the jacket structure or the sandwich structure includes a first inlet and a first outlet for the circulating coolant to enter and exit.

[0015] It should be noted that, in order to control the temperature of the material on the outer cylinder side, the outer cylinder itself can be formed into a sandwich structure, or a jacket structure can be provided around the outer wall of the outer cylinder, and a coolant can be passed through the sandwich structure or jacket structure to achieve temperature control. In addition, this application does not specifically limit the sandwich structure or jacket structure, and those skilled in the art can adjust it according to actual needs.

[0016] Preferably, the inner cylinder is a sandwich structure, or a jacket structure is circumferentially provided around the side wall of the inner cylinder; the jacket structure or sandwich structure includes a second inlet and a second outlet for the circulating coolant to enter and exit.

[0017] It should be noted that, in order to control the temperature of the material on the inner cylinder side, the inner cylinder itself can be made into a sandwich structure, or a jacket structure can be provided around the side wall of the inner cylinder, and a coolant can be passed through the sandwich structure or jacket structure to achieve temperature control. Preferably, the inner cylinder is a sandwich structure. In addition, this application does not specifically limit the sandwich structure or jacket structure, and those skilled in the art can adjust it according to actual needs.

[0018] In the present application, it is preferred that both the inner cylinder and the outer cylinder are jacketed structures, so that the temperature of the materials on the inner cylinder side and the outer cylinder side can be independently controlled, thereby achieving independent temperature control.

[0019] The purpose of setting the inner cylinder and the outer cylinder into a jacket structure in this application is to control the temperature so that the gap between the inner cylinder and the outer cylinder (i.e., the working space) forms a spatial temperature gradient. Among them, the temperatures of the inner and outer cylinders can be independently controlled by connecting a temperature control device. They can be set to an isothermal constant temperature mode or a non-isothermal spatial temperature gradient mode. Those skilled in the art can adjust it according to actual needs. In specific applications, the non-isothermal spatial temperature gradient mode can be set to two modes, one is the "hot inside and cold outside" mode, that is, the temperature is set to be higher in the inner cylinder than in the outer cylinder, and the other is the "cold inside and hot outside" mode, that is, the temperature is set to be higher in the outer cylinder than in the inner cylinder; this application does not make specific restrictions on the setting of the specific temperature gradient, and those skilled in the art can adjust it according to actual needs.

[0020] In this application, the unique double-cylinder structure of the crystallizer and the designed inner and outer cylinder temperature control jackets are utilized. By connecting the inner and outer cylinders of the crystallizer to independent temperature control equipment, a spatial temperature gradient can be formed between the surfaces of the inner and outer cylinders of the crystallizer equipment, that is, the space where periodic fluid is generated, to promote important crystallization processes such as crystal maturation and phase transformation, thereby improving the quality of the crystallized product.

[0021] Preferably, the inner cylinder and the sealing cover are detachably connected.

[0022] The present application does not specifically limit the connection method between the inner cylinder and the sealing cover. The two can be connected by spiral connection, snap connection, etc., and those skilled in the art can adjust according to actual needs. A spiral connection is preferred. When performing the spiral connection, a thread is provided on the sealing cover, and a thread is also provided at the connection between the inner cylinder and the sealing cover. When in use, the two are connected together by a threaded connection. After use, they can also be unscrewed for cleaning.

[0023] Preferably, the outer cylinder and the sealing cover are fixedly connected.

[0024] This application does not specifically limit the connection method between the outer cylinder and the sealing cover. A detachable connection is preferred. The detachable connection methods include spiral connection, snap connection, etc., and technical personnel in this field can choose according to actual needs; in order to increase the sealing performance, a sealing gasket is provided at the connection between the outer cylinder and the sealing cover.

[0025] Preferably, the outer cylinder is provided with a material inlet and outlet for material to flow in or out.

[0026] In the present application, when the crystallizer is working, the material flows into the working space through the material inlet and outlet, and when the crystallization is completed, it flows out through the inlet and outlet.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] The crystallizer of the present application is composed of coaxial inner and outer cylinders. The rotation of the inner cylinder induces a unique periodic flow pattern. The periodic flow pattern has uniform and strong fluid shear and a high mass transfer rate. It can provide a uniformly mixed, good and stable crystallization environment, and promote processes such as crystal nucleation, growth and agglomeration during crystallization. In addition, by utilizing the unique double-cylinder structure of the crystallizer and the designed inner and outer cylinder temperature-controlled jackets, and by connecting the inner and outer cylinders of the crystallizer to independent temperature-control equipment, a spatial temperature gradient can be formed between the surfaces of the inner and outer cylinders of the crystallizer equipment, that is, the space where the periodic flow is generated, promoting important crystallization processes such as crystal maturation and phase transformation, thereby improving the quality of the crystallized product. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a schematic structural diagram of a crystallizer provided in a specific embodiment of the present invention.

[0030] Among them, 1 is the inner cylinder; 2 is the outer cylinder; 3 is the sealing cover; 4 is the driving device; 5 is the gap between the inner cylinder and the outer cylinder; 6 is the fixer; 7 is the fixing device;

[0031] 1-1 is the second inlet, 1-2 is the second outlet, 2-1 is the outer tube jacket structure, 2-2 is the first inlet, and 2-3 is the first outlet. DETAILED DESCRIPTION

[0032] It should be understood that, in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0033] It should be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0034] Those skilled in the art should understand that the present invention must include necessary pipelines, conventional valves and general pump equipment for realizing a complete process, but the above content does not constitute the main innovation of the present invention. Those skilled in the art can add layouts on their own based on the process flow and equipment structure selection, and the present invention does not make special requirements or specific limitations on this.

[0035] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0036] In a specific embodiment, the present invention provides a crystallizer, such as Figure 1 As shown, the crystallizer includes: an inner cylinder 1, an outer cylinder 2, a sealing cover 3 and a driving device 4;

[0037] The outer cylinder 2 is arranged on the periphery of the inner cylinder 1, and the two are coaxially arranged, and there is a gap (also called a working space) 5 between the inner cylinder 1 and the outer cylinder 2;

[0038] In a specific embodiment, the inner and outer cylinders are coaxial cylindrical structures. A drive mechanism drives the inner cylinder to rotate at a constant speed within the outer cylinder, creating a periodic annular Taylor vortex fluid motion in the gap between the two cylinders. This is a series of axially symmetrical, orderly arranged secondary vortices, alternating in positive and negative directions, superimposed on the shear flow. This periodic annular Taylor vortex exhibits high heat and mass transfer rates and can effectively improve multiphase mixing behaviors, such as liquid-liquid, solid-liquid, and gas-liquid. This provides a uniform, well-mixed, and stable crystallization environment, promoting processes such as crystal nucleation, growth, and agglomeration.

[0039] In a specific embodiment, the outer cylinder 2 is a sandwich structure 2-1 or a jacket structure 2-1 is circumferentially arranged around the outer wall of the outer cylinder 2. Temperature control is achieved by passing cooling liquid into the sandwich structure or the jacket structure.

[0040] In a specific embodiment, the jacket structure is a sandwich formed by an outer cylinder and an external shell, and a first inlet 2-2 and a first outlet 2-3 are provided on the external shell for the inlet and outlet of circulating coolant.

[0041] A jacket structure is provided inside the inner cylinder 1, and temperature control is achieved by passing cooling liquid into the jacket; the jacket structure can be a sandwich formed by the inner cylinder and the shell inside it, or it can be an independent jacket structure provided on the inner wall of the inner cylinder.

[0042] In a specific embodiment, the jacket structure is a sandwich structure formed by the inner cylinder and the inner shell, and the top of the sandwich structure is provided with openings, namely the second inlet 1-1 and the second outlet 1-2, for the entry and exit of the coolant.

[0043] In a specific embodiment, the ratio of the outer diameter of the inner cylinder to the inner diameter of the outer cylinder is (0.25-1):1.

[0044] In a specific embodiment, the inner cylinder and the driving device are detachably connected, and the connection method can be a snap connection, a threaded connection, etc.

[0045] In a specific embodiment, the driving device includes a driving main body component, a rotating shaft and a connecting component. The two ends of the rotating shaft are the driving main body component and the connecting component respectively. The driving component plays a driving role. The rotating shaft passes through the sealing cover. The connecting component is connected to the inner cylinder. The connection method between the two is a threaded connection. The upper end of the inner cylinder is set as a threaded opening. The place where the connecting component of the driving device is connected to the inner cylinder is also set as a matching threaded opening. The two are spirally connected. After the two are connected, when the crystallizer is working, the driving device drives the inner cylinder to rotate.

[0046] In a specific embodiment, a bearing is provided on the sealing cover, and the driving device passes through the bearing on the sealing cover and is connected to the threaded opening at the top end of the inner cylinder.

[0047] In a specific embodiment, the outer cylinder and the sealing cover are fixedly connected, and the connection method can be a spiral connection, a snap connection, etc., or a fixer can be used for connection.

[0048] In a specific embodiment, the outer cylinder 2 and the sealing cover 3 are fixedly connected by a fixer 6; to ensure a sealed connection between the two, in a specific embodiment, a sealing gasket or a sealing ring is further provided at the connection between the two.

[0049] In a specific embodiment, the material works in the gap between the outer cylinder and the inner cylinder. In order to ensure the entry and exit of the material, at least one material inlet and outlet can be set on the sealing cover. The position of the material inlet and outlet corresponds to the position of the gap between the inner cylinder and the outer cylinder to ensure the entry and exit of the material; or a material inlet and outlet can be opened on the side wall of the outer cylinder, which directly passes through the gap between the inner cylinder and the outer cylinder to ensure the entry and exit of the material.

[0050] In a specific embodiment, in order to ensure the stability of the entire crystallization device, a fixing device 7 can be used for fixing, and the fixing device can be an iron frame or the like.

[0051] The applicant declares that the above is only a specific implementation method of the present invention, but the protection scope of the present invention is not limited thereto. Technicians in the relevant technical field should understand that any changes or substitutions that can be easily thought of by technicians in the relevant technical field within the technical scope disclosed in the present invention fall within the protection scope and disclosure scope of the present invention.

Claims

1. A crystallizer, characterized in that: The crystallizer comprises: an inner cylinder, an outer cylinder, a sealing cover and a driving device; The outer cylinder and the inner cylinder are coaxially arranged, and the inner wall diameter of the outer cylinder is larger than the outer wall diameter of the inner cylinder; The sealing cover is connected to the outer cylinder to form a closed space with the outer cylinder; The driving device passes through the sealing cover and is connected to the inner cylinder, and is used to drive the inner cylinder to rotate; The side wall of the outer cylinder is a sandwich structure, or the side wall of the outer cylinder is circumferentially provided with a jacket structure; The jacket structure or sandwich structure includes a first inlet and a first outlet for entering and exiting a circulating coolant.

2. The crystallizer according to claim 1, characterized in that The ratio of the outer wall diameter of the inner cylinder to the inner wall diameter of the outer cylinder is 0.25-1, but excluding 1.

3. The crystallizer according to claim 1, characterized in that The inner cylinder is a sandwich structure, or a jacket structure is provided around the side wall of the inner cylinder; The jacket structure or sandwich structure includes a second inlet and a second outlet for entering and exiting the circulating coolant.

4. The crystallizer according to claim 1, characterized in that The driving device passes through the sealing cover and is detachably connected to the inner cylinder.

5. The crystallizer according to claim 4, characterized in that The inner cylinder is spirally connected to the driving device.

6. The crystallizer according to claim 1, characterized in that The outer cylinder and the sealing cover are fixedly connected.

7. The crystallizer according to claim 1, characterized in that A sealing gasket is provided at the connection between the outer cylinder and the sealing cover.

8. The crystallizer according to claim 1, characterized in that The sealing cover is provided with at least one material inlet and outlet for materials to flow into or out of the gap between the outer cylinder and the inner cylinder.

9. The crystallizer according to claim 1, characterized in that The outer cylinder is provided with at least one material inlet and outlet for materials to flow into or out of the gap between the outer cylinder and the inner cylinder.

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