A baffle-type falling film element

Abstract

The application provides a kind of baffle type falling film element, including several vertical arrangement and oblique arrangement reaction plate, the oblique direction of adjacent plate is different, and the plate surface is provided with groove.Material is sequentially flowed down along groove from top, and the path is folded and compressed, which significantly reduces the height of equipment under the same residence time.The reaction plate is provided with built-in heating cavity, and is provided with first opening and second opening for heat medium to enter and exit;The plates are alternately connected in series to form independent heat medium loop by passing through the openings of the plates in the same direction, and the temperature and flow rate can be controlled in groups.The groove can extend in S-shaped curve to prolong the process and enhance the disturbance;The groove is wide at the top and narrow at the bottom, which can cope with the increase of material viscosity;The end of the groove is provided with a guide groove and is opened with a V / U / W-shaped notch to concentrate the material and make it fall.The multiple elements can be expanded in transverse parallel connection.The element has compact structure and high mass transfer efficiency, and is suitable for dehydration, desolventization and removal of volatile components of high viscosity or heat-sensitive liquid and molten material.

Description

Technical Field

[0001] This invention relates to the field of chemical production equipment technology, and in particular to a baffled falling film element. Background Technology

[0002] Deviation is a crucial process in the handling of high-viscosity or heat-sensitive liquids and molten materials. It is widely used for dehydration, solvent removal, and the removal of other volatile components. Therefore, the heat transfer efficiency, mass transfer efficiency, liquid film surface renewal state, and residence time distribution within the devolatilization equipment all significantly impact the removal efficiency of volatile components and product quality.

[0003] Falling film devolatilizers guide material to spread and form a liquid film on the surface of falling film elements, increasing the contact area between the material and the gas phase space. This facilitates the migration and removal of volatile components from the melt interior to the surface. For materials with high viscosity or whose viscosity gradually increases during the reaction, the structure of the falling film element, the flow path, and the material distribution state directly affect the material residence time, the liquid film surface renewal effect, and the stability of the reaction process.

[0004] Existing falling film elements typically employ vertical tube surfaces, vertical plate surfaces, or vertical surface structures with grooves. Under gravity, material flows downwards along the element surface to form a liquid film. This type of structure is simple, easy to manufacture, and can meet the requirements of some falling film processes within a certain viscosity range and throughput. Some falling film elements have grooves on their surface to limit, guide, and distribute the material; multi-layer falling film elements can also be used, allowing the material to pass through multiple falling film surfaces sequentially, increasing the flow path and surface exposure opportunities.

[0005] However, traditional falling film elements are mostly vertically arranged, with material flowing downwards along a vertical surface, resulting in a short residence time. To increase residence time, the element height or the overall reactor height usually needs to be increased, leading to larger equipment size, higher manufacturing costs, and increased plant space requirements. Furthermore, in vertical falling film processes, the material flows in a single direction with minimal directional change, limiting the renewal of the liquid film surface. For high-viscosity materials, the diffusion of volatile components from the melt interior to the surface is affected by viscosity and diffusion distance. Insufficient liquid film surface renewal further hinders the migration and escape of volatile components, limiting the improvement of devolatilization efficiency. Summary of the Invention

[0006] This invention provides a baffled falling film element, aiming to solve the problems in the prior art where traditional falling film elements are mostly vertically arranged, with materials flowing downwards along a vertical surface and resulting in a short residence time. To increase residence time, the element height or the overall reactor height usually needs to be increased, leading to larger equipment size, higher manufacturing costs, and increased plant space requirements. Furthermore, in vertical falling film processes, the material flows in a single direction with minimal directional change, limiting the renewal of the liquid film surface.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] This invention provides a baffled falling film element, comprising a plurality of reaction plates arranged vertically and inclined, with adjacent reaction plates having different inclination directions; the upward inclined surface of each reaction plate is provided with grooves along the inclination direction;

[0009] During the reaction, the material falls into the topmost reaction plate, and then flows down the grooves on the reaction plate sequentially through the grooves of each reaction plate.

[0010] In one embodiment, a heating chamber is provided inside the reaction plate, and a first opening and a second opening are provided through the side wall of the heating chamber, with the first opening located above the second opening;

[0011] The heating medium flows into the heating chamber from the first opening and flows out of the heating chamber from the second opening;

[0012] Alternatively, the heating medium may flow into the heating chamber from the second opening and out of the heating chamber from the first opening.

[0013] In one embodiment, a plurality of reaction plates inclined in the same direction form an inclined plate group. Two adjacent reaction plates in each inclined plate group are connected in series alternately through a first opening and a second opening. The first opening of the topmost reaction plate is connected to a first heat medium output pipe, and the second opening of the bottommost reaction plate is connected to a first heat medium input pipe.

[0014] In one embodiment, two adjacent reaction plates are tilted in opposite directions.

[0015] In one embodiment, the inclined surface of the reaction plate on the upward side is provided with a plurality of grooves.

[0016] In one embodiment, the trench extends along an S-shaped curve.

[0017] In one embodiment, at least one partition is provided inside the heating cavity, which divides the heating cavity into heat medium channels, and the two ends of the heat medium channels are respectively connected to the first opening and the second opening.

[0018] In one embodiment, the opening width at the upper end of the groove is W1, and the opening width at the lower end is W2, where W1 > W2.

[0019] In one embodiment, a guide groove is provided at the bottom of the trench, and a gap is provided between the bottom of the guide groove and the next layer of reaction plate;

[0020] The guide groove has W-shaped, U-shaped, and V-shaped notches at its end away from the trench.

[0021] In one embodiment, the cross-section of the trench is circular, rectangular, V-shaped, or trapezoidal.

[0022] The beneficial effects of this invention compared to the prior art are as follows: By tilting each reaction plate, the material can flow slowly down the tilted reaction plate, thereby increasing the residence time of the material on the reaction plate. Therefore, because the path of the falling film flow is folded and compressed in the vertical direction, the total height of the falling film element can be significantly reduced while requiring the same residence time, achieving equipment compactness. Simultaneously, the change in flow direction at the folding joints of each reaction plate causes liquid film disturbance and surface renewal, which is beneficial for the removal of volatile components and the improvement of mass transfer efficiency.

[0023] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are described in detail below. Attached Figure Description

[0024] Figure 1 A three-dimensional structural diagram of a baffle-type falling film element provided in an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the internal heating cavity of the reaction plate of a baffled falling film element provided in an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of one group of inclined plates of a baffle-type falling film element provided in an embodiment of the present invention;

[0027] Figure 4 A side view of a reaction plate of a baffled falling film element provided in an embodiment of the present invention;

[0028] Figure 5 An end view of one end of the reaction plate of a baffle-type falling film element provided in an embodiment of the present invention along the length of the trench;

[0029] Figure 6 This is a three-dimensional structural diagram of a baffle-type falling film element with an S-shaped groove, provided in an embodiment of the present invention.

[0030] Figure 7 This is a three-dimensional structural diagram of a baffle-type falling film element with a guide groove provided below the trench, as provided in an embodiment of the present invention.

[0031] Figure 8This is a side view of a deflector-type falling film element with a guide groove provided below the trench, as provided in an embodiment of the present invention.

[0032] Figure 9 for Figure 8 A magnified view of a portion of the image;

[0033] Figure 10 A top view of a reaction plate of a baffle-type falling film element provided in an embodiment of the present invention, wherein a guide groove is provided;

[0034] Figure 11 This is a schematic diagram of a structure in which several baffle-type falling film elements are combined together, as provided in an embodiment of the present invention.

[0035] Figure label:

[0036] 1. Reaction plate; 11. Groove; 111. Guide groove; 1111. W-shaped notch; 1112. U-shaped notch; 1113. V-shaped notch; 12. Heating chamber; 121. First opening; 122. Second opening; 123. Partition; 124. Heat medium flow channel.

[0037] 2. First heat medium inlet pipe; 21. First connecting pipe; 22. Second connecting pipe;

[0038] 3. First heat medium outlet pipe;

[0039] 4. Horizontal heat medium connection pipe. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0042] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0043] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0044] Please see Figure 1-11 This invention provides a baffled falling film element, comprising a plurality of reaction plates 1 arranged vertically and inclined, with adjacent reaction plates 1 having different inclination directions; a groove 11 is provided on the upward inclined surface of each reaction plate 1 along the inclination direction;

[0045] During the reaction, the material falls into the top reaction plate 1, and then flows down the grooves 11 on each of the reaction plates 1 in sequence.

[0046] In this embodiment, by tilting each reaction plate 1, the material can flow slowly down along the tilted reaction plate 1, thereby increasing the residence time of the material on the reaction plate 1. Therefore, since the path of the falling film flow is folded and compressed in the vertical direction, the total height of the falling film element can be significantly reduced while requiring the same residence time, achieving equipment compactness. At the same time, the material generates liquid film disturbance and surface renewal at the folding and connecting points of each reaction plate 1 due to the change in flow direction, which is beneficial to the removal of volatile components and the improvement of mass transfer efficiency.

[0047] It should be noted that in this embodiment, the adjacent reaction plates 1 can be tilted in different directions, so that liquid film disturbance and surface renewal can be generated at the folding and connecting points of each reaction plate 1 due to the change in flow direction, which is beneficial to the removal of polycondensation by-products and the improvement of mass transfer efficiency.

[0048] Preferably, in this embodiment, the two adjacent reaction plates 1 are tilted in opposite directions.

[0049] In one embodiment, such as Figure 2 As shown, a heating chamber 12 is provided inside the reaction plate 1. A first opening 121 and a second opening 122 are provided through the side wall of the heating chamber 12. The first opening 121 is located above the second opening 122.

[0050] The heating medium flows into the heating chamber 12 from the first opening 121 and flows out of the heating chamber 12 from the second opening 122.

[0051] Alternatively, the heating medium may flow into the heating chamber 12 from the second opening 122 and out of the heating chamber 12 from the first opening 121.

[0052] In this embodiment, by providing a heating chamber 12 inside the reaction plate 1, the heat medium can flow inside the heating chamber 12 through the first opening 121 and the second opening 122, thereby providing a reaction temperature to the reaction plate 1, so that the material can react smoothly when it flows in the groove 11 of the reaction plate 1.

[0053] In one embodiment, a plurality of reaction plates 1 inclined in the same direction form an inclined plate group, and two adjacent reaction plates 1 in each inclined plate group are connected in series alternately through a first opening 121 and a second opening 122.

[0054] For clarity, adjacent reaction plates 1 in this embodiment are tilted in opposite directions, and a total of six layers of reaction plates 1 are arranged, from top to bottom as layer 1, layer 2, and so on up to layer 6. Therefore, the tilted plate groups in this embodiment are divided into two groups, and each group of tilted plate groups is provided with three reaction plates 1. Figure 3 As shown, taking one set of inclined plates as an example, the first heat medium inlet pipe 2 is connected to the second opening 122 of the fifth reaction plate 1. The heat medium enters the heating chamber 12 from the second opening 122 of the fifth reaction plate 1, flows from bottom to top in the heating chamber 12 of the reaction plate 1, and then flows out from the first opening 121 of the fifth reaction plate 1. The first opening 121 of the fifth reaction plate 1 is connected to the first opening 121 of the third reaction plate 1 through the first connecting pipe 21. After entering the third reaction plate 1, the heat medium flows from top to bottom in the heating chamber 12, and then flows out from the second opening 122 of the third reaction plate 1. The second opening 122 of the third reaction plate 1 is connected to the second opening 122 of the first reaction plate 1 through the second connecting pipe 22. The heat medium flows from bottom to top in the first reaction plate 1, and finally exits from the first opening 121 of the first reaction plate 1 through the first heat medium outlet pipe 3. The flow direction of the heat medium in each reaction plate 1 alternates between opposite directions. The connection method of the heat medium circuit of the other set of inclined plates is the same, and will not be described again.

[0055] By using the above-described grouped series connection of heating chambers 12 for each group of reaction plates 1, since there are only two possible tilt directions for the reaction plates 1, the six-layer reaction plates 1 are divided into two independent heat medium loops. The single-pass heat medium loop has three layers in series, which reduces the pressure drop along the loop by approximately half compared to the fully series six-layer scheme. Compared to the fully parallel scheme, the heat medium flow rate in each layer is completely equal, eliminating the problem of uneven distribution of branch flow rates. The heat medium temperature and flow rate of the two loops can be adjusted independently.

[0056] Therefore, it can be foreseen that when this application has n layers of reaction plates 1, and the reaction plates 1 have k possible tilting directions, the tilting plates can be divided into k groups. When n is an integer multiple of k, the number of reaction plates 1 in each group is n / k. Thus, it is possible to divide into k independent heat medium loops, and the number of series stages of a single-pass heat medium loop is n / k layers.

[0057] In one embodiment, such as Figure 4 and Figure 5 As shown, the inclined surface of the reaction plate 1 on the upward side is provided with multiple grooves 11.

[0058] In this embodiment, four grooves 11 are formed on each reaction plate 1, and the grooves 11 are arranged parallel to each other along the width direction of the reaction plate 1. The cross-section of the grooves 11 can be arc-shaped, rectangular, V-shaped, or trapezoidal. In this embodiment, the grooves 11 adopt an arc-shaped cross-section, the upper groove opening width W1 of the groove 11 is 25mm, the lower groove opening width W2 of the groove 11 is 20mm, and the groove depth H is 10mm. The grooves 11 limit and guide the material, preventing the material from flowing laterally across the plate surface.

[0059] In one embodiment, such as Figure 6 As shown, the groove 11 extends along an S-shaped curve on the surface of the reaction plate 1, running from the upper end to the lower end. When multiple grooves 11 are provided, the multiple S-shaped grooves 11 are arranged parallel to each other along the width direction of the plate surface. Compared with straight grooves 11, S-shaped grooves 11 significantly extend the effective flow path of the material within the same plate length. When the material flows along the S-shaped grooves 11, it repeatedly folds back and forth in the width direction of the plate surface, and the flow direction changes continuously. The actual flow length of the material on a single groove plate can reach 1.2 to 2.0 times the straight length of the plate surface (depending on the S-shaped bend amplitude and period). This design increases the material residence time without changing the external dimensions of the reaction plate 1. At the same time, the continuous change in flow direction caused by the S-shaped bend applies continuous shear disturbance to the liquid film surface, enhancing the surface renewal effect. In addition, the S-shaped grooves 11 apply periodic lateral displacement to the material in the horizontal direction of the reaction plate 1, which strengthens the radial mixing of the material in the grooves 11 and is beneficial to the migration of volatile components inside the melt to the surface.

[0060] In further embodiments, please refer again. Figure 2 The heating chamber 12 is provided with at least one partition 123, and several partitions 123 divide the heating chamber 12 into heat medium flow channels 124. The two ends of the heat medium flow channels 124 are respectively connected to the first opening 121 and the second opening 122.

[0061] In this embodiment, the interior of the reaction plate 1 is provided with multiple partitions 123, which divide the heating chamber 12 into heat medium channels 124. In this embodiment, the heat medium channels 124 adopt an S-shaped channel and a multi-pass reversal channel: the partitions 123 alternately extend from the two sides of the heating chamber 12 inward to the opposite side but do not touch the opposite side edge, and the heat medium flows through each section of the heat medium channels 124 in sequence.

[0062] In one embodiment, the opening width at the upper end of the groove 11 is W1, and the opening width at the lower end is W2, where W1 > W2.

[0063] To address the flow stagnation and interlayer material dispersion issues caused by the increasing viscosity of the material along the flow path, the reaction plate 1 in this embodiment adopts a gradually narrowing plate width design. Specifically, the reaction plate 1 from the 6th layer to the 2i (i=4, 5, 6, etc.) layer ( Figure 1 (Only six layers are shown for illustration; the structural principle of layer 2i is the same, and the explanation here focuses on the variation of groove 11.) The width of groove 11 gradually decreases from the top to the bottom. The opening width of groove 11 at the top is W1 = 100 mm, and the opening width at the bottom is W2 = 80 mm, with a width ratio of 0.80. As the material flows downward along groove 11, the viscosity increases with the increase of molecular weight. The narrowing of groove 11 causes the material to be converged and constrained in the width direction. The flow rate compensation effect caused by the reduction of cross-sectional area counteracts the natural deceleration caused by the increase in viscosity, allowing the material to maintain an appropriate flow rate at the end of each layer. At the same time, the material leaves the plate surface in a more concentrated distribution at the bottom, which is conducive to accurately falling into the receiving range of the next layer of reaction plate 1.

[0064] In one embodiment, such as Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, a guide groove 111 is provided at the bottom of the groove 11, and a gap is provided between the bottom of the guide groove 111 and the next layer of reaction plate 1.

[0065] The guide groove 111 has a W-shaped notch 1111, a U-shaped notch 1112, and a V-shaped notch 1113 at its end away from the groove 11.

[0066] In this embodiment, a guide groove 111 is provided at the end of the groove 11 of the reaction plate 1. The length Lg of the guide groove 111 is less than the interlayer spacing Hg. In this embodiment, Lg is 20mm and Hg is 40mm. A 20mm gap is left between the end of the guide groove 111 and the upper end of the next layer of reaction plate 1.

[0067] There are three possible extension directions for the guide groove 111. The first is an arc-shaped extension, where the guide groove 111 extends along a circular arc transition line with a radius of 20mm. This results in a smooth flow change for the material along the guide groove 111, minimizing disturbance to the liquid film. The second is a straight-line extension, where the guide groove 111 extends linearly along the plate surface. This simple structure is suitable for applications with small interlayer spacing. The third is a downward-sloping extension, where the guide groove 111 extends at a 15° downward angle relative to the plate surface, allowing the material to obtain a greater vertical downward motion component. This is suitable for applications with a smaller inclination angle for the groove 11.

[0068] See Figure 10At the end of the guide channel 111, W-shaped notches 1111, U-shaped notches 1112, and V-shaped notches 1113 are provided. When the material flows to the end of the guide channel 111, it is concentrated and flows out along the V-shaped notch 1113, rather than overflowing evenly along the entire width edge of the guide channel 111, further improving the concentration of the landing point. In an alternative, the notch shape can also be U-shaped or W-shaped. The W-shaped notch 1111 is suitable for cases where the plate surface is wider, and can form multiple concentrated landing points in the width direction, each corresponding to the groove 11 on the next layer of reaction plate 1.

[0069] In one embodiment, see Figure 11 When expanded processing capacity is required, multiple baffle-type falling film elements can be arranged side by side in the transverse direction. Adjacent baffle-type falling film elements are connected by transverse heat medium connection pipes 4, which connect the heating chambers 12 of the reaction plates 1 at the same height in each unit to each other, so that multiple baffle-type falling film elements can share the heat medium supply and recovery pipeline.

[0070] In another embodiment, specifically for the final polycondensation of PET (polyterephthalic acid): the processing capacity is 150 tons per day per line, the feed intrinsic viscosity is 0.45 dL / g, and the target product intrinsic viscosity is 0.98 dL / g. The reaction plate 1 has 16 layers and a total height of 12m. Two sets of inclined plate groups each have 8 layers of reaction plate 1. The length of a single reaction plate 1 is 1200mm, and the interlayer spacing is 80mm. Layers 1 to 8 are of equal width, and the width of reaction plate 1 is 500mm. The 9th to 16th layers have gradually narrowing grooves 11. The upper width of the reaction plate 1 is 500mm, and the lower width is 350mm, with a width ratio of 0.7. These are straight grooves 11 with a trapezoidal cross-section. The opening width of the groove 11 is 60mm, the bottom opening width is 40mm, and the groove depth is 25mm. The opening width of the groove 11 narrows from W1=60mm at the top to W2=42mm at the bottom. Each plate has 6 grooves 11. An S-shaped and multi-pass reversing internal flow channel for the heat medium is used. The curved extension guide groove 111 has an arc radius of 60mm, a V-shaped notch 1113 with an included angle of 90°, and Lg=60mm. The angle between reaction plate 1 and the vertical direction is 35° for reaction plates 1 to 4, 25° for reaction plates 5 to 12, and 15° for reaction plates 13 to 16. The heat transfer medium is biphenyl-diphenyl ether heat transfer oil. The inlet temperature of the first set of inclined plate groups is 290℃, and the flow rate is 25 m³ / H. The loop inlet temperature of the second set of inclined plate groups is 288℃, and the flow rate is 25 m³ / H. The operating pressure is 50 Pa to 200 Pa (absolute pressure), and the feed temperature is 275℃.

[0071] In another embodiment, specifically applied to the post-polymerization stage of PA6 (ethylene glycol ester): This embodiment focuses on the falling film treatment in the post-melt polymerization stage of polyamide 6. The intrinsic viscosity of the material at the inlet of the falling film element is approximately 1.0 dL / g (measured at 25°C using sulfuric acid as solvent), corresponding to a melt dynamic viscosity of approximately 80 Pa·s to 200 Pa·s at 260°C; after polymerization, the intrinsic viscosity at the outlet increases to approximately 1.8 dL / g to 2.2 dL / g. Within the falling film element, from the feed end to the discharge end, the intrinsic viscosity increases by approximately 1.0 dL / g to 2.0 dL / g (median value), representing an increase of approximately 5 to 8 times. The viscosity change of PA6 melt during polymerization is relatively narrower than that of PET, with increases within the same order of magnitude, but it requires high temperature uniformity; localized overheating can easily lead to thermal degradation.

[0072] The falling film element consists of 10 layers, with a total height of 8m, divided into two groups of inclined plates, each with 5 layers. The inclination angle is uniformly 30°. The plate surface is 350mm wide. S-shaped curved grooves 11 are used, with a circular arc cross-section. The upper opening width of groove 11 is W1=25mm, the lower opening width is W2=20mm, and the groove depth is H=10mm. Each reaction plate 1 has 4 S-shaped curved grooves 11, with the S-shaped amplitude being 20% ​​of the plate surface width (i.e., 70mm), and each plate has 3 complete S-shaped cycles. The S-shaped curved grooves 11 extend the effective flow length of a single plate to approximately 1.5 times the straight length of the plate surface. A downward-sloping extension type guide groove 111 has a downward slope angle of 15°. The heat transfer medium is heat transfer oil, with an inlet temperature of 265℃ for the first loop and 263℃ for the second loop. The remaining structure is similar to that of Example 1.

[0073] (1) The equipment height is significantly reduced and the structure is compact: The reaction plate 1 is set at an angle and the adjacent plates are tilted in different directions, so that the flow path of the material in the vertical direction is "folded and compressed". Under the premise of requiring the same residence time, the total height of the falling film element can be greatly reduced, realizing the miniaturization and compactness of the equipment.

[0074] (2) The residence time is extended and the reaction is more complete: the material flows slowly down the inclined reaction plate 1, and the design of the S-shaped curve groove 11 (the actual flow length can reach 1.2 to 2.0 times the straight length of the plate surface) further extends the effective residence time of the material without changing the outer dimensions of the plate surface, which is conducive to the reaction.

[0075] (3) Enhanced liquid film disturbance and surface renewal, resulting in improved mass transfer efficiency: The flow direction of the material changes at the folding and connecting points of each reaction plate 1, generating liquid film disturbance and surface renewal, which is beneficial for the removal of polycondensation byproducts.

[0076] The S-shaped groove 11 causes the material to repeatedly fold back and forth in the width direction of the plate, resulting in a continuous change in flow direction. This applies continuous shear disturbance to the liquid film, further enhancing surface renewal and radial mixing, and promoting the migration of by-products from the inside of the melt to the surface.

[0077] (4) The heating chamber 12 is designed flexibly and the temperature control is precise: The reaction plate 1 has a built-in heating chamber 12, which can be introduced into the heat medium through the first opening 121 and the second opening 122 to provide a stable temperature for the reaction.

[0078] The heat transfer medium loop adopts a grouped series configuration (e.g., six layers divided into two groups of three layers each), which reduces the pressure drop along the loop by about half compared to a fully series configuration. Compared to a fully parallel configuration, the heat transfer medium flow rate is completely equal in each layer, eliminating the problem of uneven flow distribution. Furthermore, the heat transfer medium temperature and flow rate of the two loops can be independently controlled to adapt to different process requirements.

[0079] (5) Groove 11 tapering design to cope with increased viscosity: The upper opening of groove 11 is wider than the lower opening (e.g., W1=100mm, W2=80mm). As the material flows downward and the viscosity increases, the groove 11 narrows to generate a flow rate compensation effect, resisting natural deceleration, so that the material still maintains an appropriate flow rate at the end of each layer, and the lower end is concentrated, which is conducive to accurately falling into the next layer of the plate.

[0080] (6) Guide groove 111 and notch design, accurate and controllable material drop: The end of the groove 11 is provided with a guide groove 111 (arc / straight / downward extension type), and the end is provided with a V-shaped notch 1113, a U-shaped notch 1112 or a W-shaped notch 1111, so that the material is concentrated and flows out, improving the concentration of the drop point and avoiding overflow and dispersion, which is especially suitable for interlayer connection.

[0081] (7) Modular expansion is convenient: Multiple baffle falling film elements can be arranged in parallel along the horizontal direction. The heating chambers 12 of the reaction plate 1 at the same height are connected through the horizontal heat medium connection pipe 4 to realize the shared heat medium supply and recovery pipeline, which is convenient for flexible expansion according to the processing capacity requirements.

[0082] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A baffle-type falling film element, characterized in that, It includes several reaction plates arranged vertically and tilted, with adjacent reaction plates tilting in different directions; the upward tilted side of each reaction plate has grooves along the tilting direction. During the reaction, the material falls into the topmost reaction plate, and then flows down the grooves on the reaction plate sequentially through the grooves of each reaction plate.

2. The baffled falling film element according to claim 1, characterized in that, The reaction plate has a heating chamber inside, and the side wall of the heating chamber has a first opening and a second opening through it, with the first opening located above the second opening; The heating medium flows into the heating chamber from the first opening and flows out of the heating chamber from the second opening; Alternatively, the heating medium may flow into the heating chamber from the second opening and out of the heating chamber from the first opening.

3. The baffled falling film element according to claim 2, characterized in that, A group of several reaction plates inclined in the same direction is formed. Two adjacent reaction plates in each group are connected in series through a first opening and a second opening. The first opening of the top reaction plate is connected to the first heat medium output pipe, and the second opening of the bottom reaction plate is connected to the first heat medium input pipe.

4. The baffled falling film element according to any one of claims 1 to 3, characterized in that, The two adjacent reaction plates are tilted in opposite directions.

5. The baffled falling film element according to claim 1, characterized in that, The reaction plate has multiple grooves on its upward-facing inclined surface.

6. The baffled falling film element according to claim 1, 2, 3, or 5, characterized in that, The trench extends along an S-shaped curve.

7. The baffled falling film element according to claim 2 or 3, characterized in that, The heating chamber is provided with at least one partition, which divides the heating chamber into heat medium channels. The two ends of the heat medium channels are respectively connected to the first opening and the second opening.

8. The baffled falling film element according to claim 1, 2, 3, or 5, characterized in that, The opening width at the upper end of the groove is W1, and the opening width at the lower end is W2, where W1 > W2.

9. The baffled falling film element according to claim 1, 2, 3, or 5, characterized in that, A guide groove is provided at the bottom of the trench, and a gap is provided between the bottom of the guide groove and the next layer of reaction plate; The guide groove has W-shaped, U-shaped, and V-shaped notches at its end away from the trench.

10. The baffled falling film element according to claim 1, 2, 3, or 5, characterized in that, The cross-section of the groove can be circular, rectangular, V-shaped, or trapezoidal.

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