A plate crystallizer and a prong-shaped support plate for static crystallization

Abstract

The utility model relates to crystallizer technical field discloses a kind of plate crystallizer and thorn-shaped support plate for static crystallization, the thorn-shaped support plate includes support plate body and the several inverted thorn of being set on support plate body, support plate body is overall in mesh structure, thorn is all fixed on support plate body, and thorn is inclined outward from bottom to top along support plate body setting. The utility model passes through the directional flow guiding effect of thorn structure, significantly enhances liquid flow, eliminates the liquid stagnation phenomenon and the collapse crystal phenomenon of traditional support plate, effectively solves the problem of "sweating", improves the sweating efficiency, while reducing mother liquor residue. Compared with original crystallizer, the improved crystallizer can realize product crystallization one-way yield increase of 3-7% in the purification of BDO (1.4-butylene glycol).

Description

Technical Field

[0001] This utility model relates to the field of crystallizer technology, specifically to a plate crystallizer and a spiked support plate for static crystallization. Background Technology

[0002] Static melt crystallization is a highly efficient separation and purification technique. Its core principle is to utilize the difference in melting points of substances to selectively crystallize the target component and separate it from impurities under static conditions. It boasts advantages such as high separation efficiency, mild operating conditions, no need for organic solvents, and environmental friendliness. It is widely used in the separation and purification of fine chemicals, specialty polymers, isomers, and pharmaceutical intermediates and active ingredients. Furthermore, static melt crystallization can also be applied in the food industry to refine fatty acids, sugars, vitamins, etc., while preserving the natural properties of the products.

[0003] The static crystallization process is mainly completed using a crystallizer, whose structural design directly affects crystallization efficiency and product quality. A plate crystallizer mainly consists of three parts: a heat exchange system, a crystallization space, and a feeding, discharging, and crystal removal system, forming a stacked or layered structure. The core of a traditional plate crystallizer is providing a crystallization surface through multiple layers of heat exchange plates. However, due to the slow flow of the solution in the channels between the crystallization plates and the lack of forced mixing, the cooling of areas far from the plate walls lags behind, creating a temperature gradient that leads to uneven crystallization rate and crystal size. Utility Model Content

[0004] The present invention aims to provide a plate crystallizer and a spiked support plate for static crystallization, so as to solve the problems of liquid stagnation and uneven crystallization caused by slow solution flow and lack of forced mixing in the channel between crystallizer plates in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a spiked support plate for static crystallization, comprising a support plate body and a plurality of inverted spikes disposed on the support plate body. The support plate body is generally in the form of a mesh structure, and the spikes are all fixed on the support plate body, and the spikes are arranged inclined outward from bottom to top along the support plate body.

[0006] Preferably, as an improvement, the angle between the spike and the support plate is 45~60°.

[0007] Preferably, as an improvement, the angle between the spike and the support plate is 45°.

[0008] Preferably, as an improvement, the mesh holes in the mesh structure on the support plate are all rectangular / square.

[0009] Preferably, as an improvement, the spikes are spaced apart along the mesh holes, and all spikes are fixed at the middle of the bottom edge of the mesh holes.

[0010] Preferably, as an improvement, each mesh hole is provided with a spike, and the spikes in the odd-numbered rows are all located in the middle left position of the mesh hole, while the spikes in the even-numbered rows are all located in the middle right position of the mesh hole.

[0011] Preferably, as an improvement, the four corners of the support plate are rounded, and a handle is provided on the top of the support plate.

[0012] Preferably, as an improvement, a plate crystallizer for static crystallization is provided, wherein a crystallization plate is provided inside the crystallizer box, and a spiked support plate is detachably connected to the crystallization plate.

[0013] The principle and advantages of this solution are as follows: In practical applications, existing support plates are arranged in a "Z" shape, which has low heat transfer efficiency, uneven heating during sweating, and may lead to local overheating or cooling, reducing the sweating effect. Furthermore, the "Z"-shaped support plate also has the problem of high compaction of the crystal bed, which is not conducive to the discharge of molten impurities and easily results in impurity residue. Based on this, this technical solution optimizes the structure of the support plate by forming multiple "micro-turbulence units" through inverted and tilted spikes. The optimized support plate structure of this technical solution has the following advantages: (1) Enhanced heat transfer: The spiked structure of this technical solution can significantly increase the heat exchange area, improve the heat exchange efficiency, improve the uniformity of heating during the sweating process, and more effectively melt the impurity layer on the crystal surface.

[0014] (2) Improved liquid flow distribution: In this technical solution, the inverted and tilted spikes form multiple "micro-turbulence units". When the solution flows, the sharp head of the spikes will cut the laminar boundary layer, causing the fluid to form a local low-pressure zone around the spikes, which will drive the surrounding fluid to rotate and mix, forming a stable micro-turbulent flow field, thereby promoting the flow and discharge of molten impurities, reducing the stagnation zone, and improving the impurity removal rate.

[0015] (3) Improve sweating efficiency: During the sweating stage, the spiked support plate can provide more point contact and micro-flow path, making the crystal bed easier to "breathe". Local heating can be precisely controlled, thereby removing impurities more thoroughly and improving product purity. The spiked structure brings the heat source closer to the crystal surface, enabling rapid and uniform heating during sweating, avoiding local overheating, thus melting impurities more effectively and ensuring the integrity of the crystal body.

[0016] (4) Efficient impurity discharge: The square channel provides a clear channel for the fluid. Compared with solid support plates or irregular holes, it reduces the local resistance loss of fluid flow, thereby reducing the risk of impurity recrystallization and ensuring higher crystal purity after sweating.

[0017] (5) Experimental verification shows that the crystallizer of this invention can increase the single-pass yield of BDO (1,4-butanediol) by 3-7% in purification. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a plate crystallizer for static crystallization according to the present invention.

[0019] Figure 2 This is a schematic diagram of the spike-shaped support plate in Embodiment 1 of this utility model.

[0020] Figure 3 This is a schematic diagram of the structure of the spiked support plate and the crystallizing plate in Embodiment 1 of this utility model.

[0021] Figure 4 This is a schematic diagram of the spike-shaped support plate in Embodiment 2 of this utility model. Detailed Implementation

[0022] The following detailed description provides further details on specific embodiments, but the embodiments of this utility model are not limited thereto. Unless otherwise specified, the technical means used in the following embodiments are conventional means well known to those skilled in the art; the experimental methods used are all conventional methods; and the materials and reagents used are all commercially available.

[0023] The reference numerals in the accompanying drawings include: 1. Crystallizer housing; 2. Medium inlet; 3. Medium outlet; 4. Exhaust port; 5. Material inlet; 6. Crystallizing plate; 7. Support leg; 8. Support plate; 9. Mesh hole; 10. Spike; 11. Handle.

[0024] The basic implementation examples are as follows: Figure 1 As shown: A plate crystallizer for static crystallization includes a crystallizer housing 1, a medium inlet 2, a medium outlet 3, an exhaust port 4, a material inlet 5, and a crystallization plate assembly.

[0025] The crystallizer housing 1 serves as the overall enclosure. It is equipped with a jacket, through which hot and cold media are simultaneously introduced, along with the media plates inside the crystallizer. These media are used for cooling during crystallization and heating during sweating, respectively. The media inlet 2, media outlet 3, exhaust port 4, and material inlet 5 are all located at the top of the crystallizer housing 1. Media inlet 2 and media outlet 3 are used for the entry of the hot / cold media, while material inlet 5 is used for the entry of the material to be crystallized. Exhaust port 4 is mainly used for venting and regulating the internal pressure of the crystallizer housing 1. A material outlet is located at the bottom of the crystallizer housing 1, and a valve (not shown in the figure) is installed at the material outlet. Four vertically arranged support legs 7 are bolted to the bottom of the crystallizer housing 1, providing overall support.

[0026] The crystallization plate assembly is fixed inside the crystallizer housing 1. The crystallization plate assembly includes several vertically arranged crystallization plates 6. The crystallization plate 6 has a double-layer structure with a cavity in the middle. The top of each crystallization plate is connected to a medium feed pipe and a medium discharge pipe. The medium feed pipe is connected to the medium inlet 2, and the medium discharge pipe is connected to the medium outlet 3.

[0027] Combination Figure 2-3 As shown, a spiked support plate is hung on the crystallizing plate 6. In this embodiment, the spiked support plate is a mesh structure with spikes 10. The material can be 304 stainless steel, 316L stainless steel, 2205 stainless steel, or Hastelloy, and the appropriate material can be selected based on the corrosiveness of the material. The spiked support plate includes a mesh support plate body 8. The mesh holes 9 of the support plate body 8 are all rectangular / square. The four corners of the support plate body 8 are rounded, and a handle 11 is provided on the top of the support plate body 8. Several spikes 10 are fixed on the support plate body 8 from bottom to top outward. The spikes 10 are spaced along the mesh holes 9, and each spike 10 is fixed at the middle of the bottom edge of the mesh hole 9. The inclination angle between the spikes 10 and the support plate body 8 is 45°.

[0028] When using the crystallizer described above for purification, firstly, the cooling medium, such as cooling water, brine, or heat transfer oil, flows into the cavity of the crystallizer plate 6 through the medium inlet 2. Then, the raw material to be purified is introduced into the crystallizer housing 1 through the material inlet 5. Under the action of the spiked support plate, the raw material liquid is splashed during feeding, changing the liquid flow direction and causing turbulence due to collisions. This increases the heat exchange area, ensuring full contact between the raw material and the crystallizer plate 6; it also eliminates the liquid retention and crystal collapse phenomena associated with traditional support plates during the sweating process. The formed crystals are trapped in the angled area between the spikes 10 and the support plate 8, while the separated mother liquor falls.

[0029] After crystallization is complete, open the valve at the material outlet to discharge the mother liquor, then close the valve. Initiate heating and sweating; after sweating, the remaining crystals in the crystallizer are the high-purity product. Reheat to melt the high-purity crystals in the crystallizer. Once all the high-purity crystals have melted, open the valve at the material outlet to collect the finished product.

[0030] In this embodiment, by optimizing the structure of the crystallizing plate 6 and the spiked support plate, and through the directional flow guiding effect of the spikes 10, the liquid flow is significantly enhanced, eliminating the liquid retention and crystal collapse phenomena of traditional support plates, effectively solving the "sweating" problem, improving sweating efficiency, and reducing mother liquor residue. Compared with the original crystallizer, the improved crystallizer can achieve a 3-7% increase in the single-pass yield of BDO (1,4-butanediol) product crystallization.

[0031] Example 2 like Figure 4As shown, the difference between this embodiment and embodiment 1 is that in this embodiment, the arrangement of the spikes 10 on the spiked support plate is as follows: each mesh hole 9 is provided with a spike 10, the spikes 10 in the odd-numbered rows are fixed in the middle left position of the mesh hole 9, and the spikes 10 in the even-numbered rows are fixed in the middle right position of the mesh hole 9, and so on in an alternating manner.

[0032] In this embodiment, the spikes 10 on the spiked support plate are arranged in an interlaced structure, which can further increase the turbulence effect.

[0033] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A spike-shaped support plate for static crystallization, characterized in that: It includes a support plate and several inverted spikes disposed on the support plate. The support plate has an overall mesh structure, and the spikes are all fixed on the support plate and are arranged at an outward angle from bottom to top along the support plate.

2. The spiked support plate for static crystallization according to claim 1, characterized in that: The angle between the spike and the support plate is 45~60°.

3. A spiked support plate for static crystallization according to claim 2, characterized in that: The angle between the spike and the support plate is 45°.

4. A spiked support plate for static crystallization according to claim 1 or 2, characterized in that: The mesh holes in the mesh structure on the support plate are all rectangular / square.

5. A spiked support plate for static crystallization according to claim 4, characterized in that: The spikes are spaced apart along the mesh holes, and each spike is fixed at the middle of the bottom edge of the mesh holes.

6. A spiked support plate for static crystallization according to claim 4, characterized in that: Each mesh opening is equipped with spikes, with the spikes in odd-numbered rows positioned to the left of the center of the mesh opening, and the spikes in even-numbered rows positioned to the right of the center of the mesh opening.

7. A spiked support plate for static crystallization according to claim 5 or 6, characterized in that: The four corners of the support plate are rounded, and a handle is provided on the top of the support plate.

8. A plate crystallizer for static crystallization, characterized in that: The crystallizer box is equipped with a crystallization plate, and the crystallization plate is detachably connected to the spike-shaped support plate as described in claim 1.

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