Strip falling type devolatilization device

Abstract

The utility model belongs to the technical field of chemical engineering, and particularly relates to a strip-falling type devolatilization device, which comprises a feed port, a gas outlet, a discharge port, a liquid distributor and a plurality of heating conductors, the liquid distributor is used for distributing materials and dividing the interior of the strip-falling type devolatilization device into a feed area and a devolatilization area, and all the heating conductors are positioned in the devolatilization area and are distributed at intervals in a strip-falling manner; materials flow along the outer wall of the heating conductor after being distributed by the liquid distributor and are devolatilized. The liquid distributor is arranged to divide the interior of the falling strip type devolatilization device into the feeding area and the devolatilization area, all the heating conductors are located in the devolatilization area and distributed at intervals in a falling strip mode, materials can flow along the outer walls of the heating conductors after being distributed through the liquid distributor, in the flowing process, the materials are heated, and the temperature of the materials is increased. Volatile substances in the materials are continuously evaporated, and along with evaporation, the viscosity of the materials is increased, the flowing speed of the materials is reduced, and at the moment, the devolatilization effect can be ensured by increasing the heating temperature of the heating conductor.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical production equipment, and specifically relates to a falling strip type devolatilizer. Background Art

[0002] Devolatilization refers to the process of separating unreacted monomers, solvents, by-products and other substances from the polymer system. The devolatilization effect directly affects the performance of the product. The devolatilizer is a device used to remove small molecular substances from the polymer. It uses the different boiling points of different polymer media to distribute the materials through a liquid-liquid distributor to vaporize and separate different components in the polymer system. During the devolatilization process, unreacted monomers, solvents, by-products and other substances evaporate from the polymer system, thereby improving the purity of the product.

[0003] According to the dynamic and static states, the devolatilizer can be divided into a dynamic devolatilizer and a static devolatilizer. The dynamic devolatilizer relies on the movement of the equipment parts in contact with the polymer to transfer the material, while the static devolatilizer mainly relies on the material's own gravity to transport the polymer. Among them, the dynamic devolatilizer has a complex structure and high production and operation costs. Compared with the dynamic devolatilizer, the static devolatilizer has the advantages of simple equipment structure and simple operation. Traditional static devolatilizers include flash evaporators, falling strip devolatilizers, membrane devolatilizers, etc. Among them, the falling strip devolatilizer is the most widely used in the devolatilization process.

[0004] The current strip devolatilizer has an old structure, with a heater on the top and a liquid-liquid distributor on the top. The polymer is preheated in the heater on the top of the strip devolatilizer and then falls freely through the liquid-liquid distributor. However, as unreacted monomers, solvents, by-products and other substances are removed, the viscosity of the polymer increases, affecting the devolatilization effect. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a falling strip devolatilizer to solve the technical problems existing in the prior art that when using the existing falling strip devolatilizer to devolatilize the polymer, as the unreacted monomers, solvents, by-products and other substances are removed, the viscosity of the polymer increases, affecting the devolatilization effect, etc.

[0006] To achieve the above purpose, the scheme of the utility model is as follows:

[0007] In the first aspect, the present application provides a strip-type devolatilizer, which includes a feed inlet, an air outlet, a discharge outlet, a liquid distributor, and a plurality of heating conductors. The liquid distributor is used to distribute the material and divide the interior of the strip-type devolatilizer into a feed zone and a devolatilization zone. All the heating conductors are located in the devolatilization zone and are distributed in a strip-like manner. After being distributed by the liquid distributor, the material flows along the outer wall of the heating conductor and is devolatilized.

[0008] The principle of the falling strip devolatilizer of the present application is as follows: by arranging the liquid distributor to divide the interior of the falling strip devolatilizer into a feed zone and a devolatilization zone, all heating conductors are located in the devolatilization zone and are distributed in a falling strip-like manner, so that the material can flow along the outer wall of the heating conductor after being distributed by the liquid distributor. During the flow, the material is heated, and the volatile substances such as small molecular monomers and solvents in the material are continuously evaporated. As the evaporation proceeds, the viscosity of the material increases and the flow rate decreases. At this time, the devolatilization effect can be ensured by increasing the heating temperature of the heating conductor.

[0009] In an exemplary embodiment of the present application, in the falling strip devolatilizer, all the heating conductors extend downward from the bottom of the liquid-liquid distributor to the lower part of the falling strip devolatilizer.

[0010] In an exemplary embodiment of the present application, the heating conductor is in a column shape, a rod shape, a tube shape or a long strip shape.

[0011] In an exemplary embodiment of the present application, the heating conductor includes a heating element and a protective cover for protecting the heating element, and the material flows along the outer wall of the protective cover for devolatilization.

[0012] Specifically, the present application configures the heating conductor to include a heating element and a protective cover for protecting the heating element. The protective cover can protect the heating conductor, thereby preventing the material attached to the heating conductor from damaging the heating element after being heated, affecting the heating effect, and further affecting the devolatilization effect.

[0013] In an exemplary embodiment of the present application, a protective layer is provided on the outer wall of the protective sleeve.

[0014] Specifically, the present application can provide a protective layer on the outer wall of the protective cover to protect the protective cover and prevent the protective cover from being oxidized by air during the heating process.

[0015] In an exemplary embodiment of the present application, a material distribution mechanism is provided in the falling strip devolatilizer, and the material enters the liquid distributor through the material distribution mechanism.

[0016] In an exemplary embodiment of the present application, the material distribution mechanism adopts a sprayer, and the sprayer is used to spray materials.

[0017] Specifically, the present application configures the material distribution mechanism to adopt a sprayer, which can spray the material into the distribution holes of the liquid-liquid distributor through the sprayer, thereby improving the dispersibility of the polymer and further improving the devolatilization effect.

[0018] In an exemplary embodiment of the present application, the liquid distributor comprises distribution holes, the distribution holes are connected to flow guide channels, and the flow guide channels are used to guide the material from the distribution holes to the outer wall of the heating conductor.

[0019] In an exemplary embodiment of the present application, the guide channel extends from the distribution hole to the upper end of the heating conductor and is connected to the outer wall of the heating conductor.

[0020] In an exemplary embodiment of the present application, a plurality of distribution holes and a plurality of guide channels are evenly distributed around each heating conductor, and each distribution hole is arranged in a one-to-one correspondence with each guide channel.

[0021] In an exemplary embodiment of the present application, the falling strip devolatilizer comprises a shell, the feed port, the gas outlet and the discharge port are all arranged on the shell, and the liquid distributor and all the heating conductors are located inside the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a falling strip devolatilizer shown in an exemplary embodiment of the utility model;

[0023] Figure 2 for Figure 1 The structural schematic diagram of the liquid distributor shown in FIG.

[0024] Figure 3 for Figure 1 A schematic diagram of the partial connection structure between the liquid distributor and the heating mechanism is shown;

[0025] Figure 4 for Figure 1 The structural schematic diagram of the sprayer is shown in FIG.

[0026] Reference numerals

[0027] 1-shell, 11-feed port, 12-air outlet, 13-discharge port, 14-feed main pipe, 15-feed branch pipe, 16-injector, 161-spray hole;

[0028] 2-liquid distributor, 21-distribution hole;

[0029] 31-heating element, 32-protective cover;

[0030] 4-channel. DETAILED DESCRIPTION

[0031] The present invention is further described below through specific concrete examples, but it should be pointed out that the specific material ratios, process conditions and results described in the embodiments of the present invention are only used to illustrate the present invention and cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

[0032] The utility model provides a falling strip devolatilizer, which comprises a shell 1, on which a feed inlet 11, an air outlet 12 and a discharge outlet 13 are arranged;

[0033] The shell 1 is provided with a liquid distributor 2, a material distribution mechanism and a plurality of heating conductors. The material enters the liquid distributor 2 through the material distribution mechanism. The material distribution mechanism adopts a sprayer 16, and the sprayer 16 is used to spray the material.

[0034] The liquid distributor 2 is used to distribute the material and divide the interior of the strip devolatilizer into a feed zone and a devolatilization zone. After being distributed by the liquid distributor 2, the material flows along the outer wall of the heating conductor and is devolatilized. The liquid distributor 2 includes a distribution hole 21, and the distribution hole 21 is connected to a guide channel 4. The guide channel 4 is used to guide the material from the distribution hole 21 to the outer wall of the heating conductor. The guide channel 4 extends from the distribution hole 21 to the upper end of the heating conductor and is connected to the outer wall of the heating conductor.

[0035] All heating conductors are located in the devolatilization zone and are distributed at intervals in a falling strip type. All heating conductors extend downward from the bottom of the liquid-liquid distributor 2 to the lower part of the falling strip devolatilizer. The heating conductors are in the shape of columns, rods, tubes or strips. The heating conductors include a heating element 31 and a protective cover 32 for protecting the heating element 31. The material flows along the outer wall of the protective cover 32 for devolatilization. A plurality of distribution holes 21 and a plurality of guide channels 4 are evenly distributed around each heating conductor, and each distribution hole 21 is arranged in a one-to-one correspondence with each guide channel 4.

[0036] It should be noted that all directional indications (such as up, down, top, and bottom) in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In this application, unless otherwise clearly specified and limited, the term "connection" and the like should be understood in a broad sense. For example, "connection" can be a direct connection or an indirect connection through an intermediate medium, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0039] The present invention is described in detail below through specific examples. It should also be understood that the following examples are only used to specifically illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by technicians in this field based on the above content of the present invention belong to the scope of protection of the present invention. The specific process parameters and the like in the following examples are also only examples within a suitable range, that is, those skilled in the art can make a selection within a suitable range through the description of this article, and are not limited to the specific values ​​​​in the examples below.

[0040] The current strip-type devolatilizer has an old structure, with a heater on the top and a liquid-liquid distributor on the upper part. The polymer is first preheated in the heater on the upper part of the strip-type devolatilizer and then falls freely through the liquid-liquid distributor. However, as unreacted monomers, solvents, by-products and other substances are removed, the viscosity of the polymer increases, affecting the devolatilization effect. In view of the above problems, the utility model proposes a strip-type devolatilizer.

[0041] like Figures 1 to 4 As shown, in an exemplary embodiment of the utility model, the strip-type devolatilizer is used as a place for devolatilization of the polymer to be treated (i.e., material), and the strip-type devolatilizer includes a shell 1, in which a liquid distributor 2 and a plurality of heating conductors are arranged, and the liquid distributor 2 divides the interior of the shell 1 into a feed zone and a devolatilization zone.

[0042] Please continue reading Figures 1 to 4 The upper part of the shell 1 is provided with a feed port 11, the top of the shell 11 is provided with an air outlet 12, and the bottom of the shell 1 is provided with an outlet 13. The feed port 11 is used as an entrance for materials to enter the shell 1. The feed port 11 is connected to a feed main pipe 14, and the feed main pipe 14 is connected to a plurality of feed branch pipes 15. All feed branch pipes 15 are connected to a distribution mechanism. The material enters the liquid distributor 2 through the distribution mechanism. The distribution mechanism adopts a sprayer 16. The sprayer 16 is located in the feed area. The sprayer 16 is used to spray the material. The sprayer 16 is evenly provided with a plurality of spray holes 161. The air outlet 12 is used as an outlet for volatile components such as small molecular monomers and solvents in the material to be discharged from the strip-type devolatilizer. The outlet 13 is used as an outlet for the material after the volatile components such as small molecular monomers and solvents are removed to be discharged from the strip-type devolatilizer.

[0043] Specifically, the present invention arranges the sprayer 16 to be evenly provided with a plurality of spray holes 161, so that the polymer to be treated can be evenly sprayed into the distribution holes 21 of the liquid distributor 2 through the spray holes 161 at the same time, thereby improving the dispersion of the material and further improving the devolatilization effect.

[0044] Please continue reading Figures 1 to 4 The liquid distributor 2 is used as a component for evenly distributing the material. The liquid distributor 2 is evenly provided with a plurality of distribution holes 21, and the distribution holes 21 are connected with a guide channel 4, which is used to guide the material from the distribution holes 21 to the outer wall of the heating conductor. The guide channel 4 extends from the distribution holes 21 to the upper end of the heating conductor and is connected to the outer wall of the heating conductor.

[0045] Please continue reading Figures 1 to 4 , a number of distribution holes 21 and a number of guide channels 4 are evenly distributed around each heating conductor, and each distribution hole 21 is arranged one by one with each guide channel 4. The heating conductor extends downward from the bottom of the liquid distributor 2 to the lower part of the strip-type devolatilizer, and the heating conductor is in the shape of a column, a rod, a tube or a strip. The heating conductor includes a heating element 31 and a protective cover 32 for protecting the heating element 31. The outer wall of the protective cover is provided with a protective layer (not shown). There is no restriction on the material of the heating element 31, and the protective layer can be heated to 800°C. The protective cover 32 can be a stainless steel protective cover, and the protective layer can be a magnesium oxide protective layer.

[0046] Specifically, the utility model configures the heating conductor to include a heating element 31 and a protective cover 32 for protecting the heating element. The protective cover can protect the heating element, thereby preventing the material attached to the heating conductor from damaging the heating element after being heated, thereby affecting the heating effect and further affecting the devolatilization effect. By adding a protective layer to the outer wall of the protective cover 32, the protective cover 32 can be protected to prevent the protective cover 32 from being oxidized by air during the heating process.

[0047] The principle of the falling strip devolatilizer of the utility model is as follows: by arranging the liquid distributor 21 to divide the interior of the falling strip devolatilizer into a feed zone and a devolatilization zone, all heating conductors are located in the devolatilization zone and are distributed in a falling strip-like manner, so that the material can flow along the outer wall of the protective layer after being distributed by the liquid distributor 2. During the flow, the material is heated, and the volatile substances such as small molecular monomers and solvents in the material are continuously evaporated. As the evaporation proceeds, the viscosity of the material increases and the flow rate decreases. At this time, the devolatilization effect can be ensured by increasing the heating temperature of the heating element.

[0048] The process of devolatilization using the strip-type devolatilizer of the utility model is as follows:

[0049] The polymer to be treated (i.e., material) is pumped to the feed port 11 by a centrifugal pump, and the material is evenly sprayed into the distribution holes 21 of the liquid distributor 2 through the sprayer 16, and then reaches the outer wall of the heating conductor 31 through the guide channel 4 between the distribution holes 21 and the outer wall of the heating conductor. The material flows evenly and orderly along the outer wall of the protective layer due to gravity, and is heated by the heating element 31 while flowing. The small molecular monomers and volatile substances such as solvents in the material are continuously evaporated. As the evaporation proceeds, the viscosity of the material increases and the flow rate decreases. At this time, the heating temperature of the heating conductor is increased to ensure the devolatilization effect. The small molecular monomers and volatile substances such as solvents are discharged from the top outlet 12, and the devolatilized product is discharged from the bottom outlet 13.

[0050] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A falling strip devolatilizer, characterized in that: The strip-type devolatilizer comprises a feed port, an air outlet, a discharge port, a liquid distributor, and a plurality of heating conductors. The liquid distributor is used to distribute the material and divide the interior of the strip-type devolatilizer into a feed zone and a devolatilization zone. All the heating conductors are located in the devolatilization zone and are distributed in a strip-type interval. After being distributed by the liquid distributor, the material flows along the outer wall of the heating conductor and is devolatilized.

2. The falling strip devolatilizer according to claim 1, characterized in that: In the falling strip devolatilizer, all the heating conductors extend downward from the bottom of the liquid-liquid distributor to the lower part of the falling strip devolatilizer.

3. The falling strip devolatilizer according to claim 1, characterized in that: The heating conductor is in the shape of a column, a rod, a tube or a strip.

4. The falling strip devolatilizer according to claim 1, characterized in that: The heating conductor comprises a heating element and a protective cover for protecting the heating element, and the material flows along the outer wall of the protective cover for devolatilization.

5. The falling strip devolatilizer according to claim 1, characterized in that: A material distribution mechanism is provided in the falling strip devolatilizer, and the material enters the liquid distributor through the material distribution mechanism.

6. The falling strip devolatilizer according to claim 5, characterized in that: The material distribution mechanism adopts a sprayer, and the sprayer is used for spraying materials.

7. The falling strip devolatilizer according to claim 1, characterized in that: The liquid distributor comprises distribution holes, the distribution holes are connected with guide channels, and the guide channels are used to guide the material from the distribution holes to the outer wall of the heating conductor.

8. The falling strip devolatilizer according to claim 7, characterized in that: The guide channel extends from the distribution hole to the upper end of the heating conductor and is connected to the outer wall of the heating conductor.

9. The falling strip devolatilizer according to claim 7, characterized in that: A number of distribution holes and a number of guide channels are evenly distributed around each heating conductor, and each distribution hole is arranged in one-to-one correspondence with each guide channel.

10. The falling strip devolatilizer according to claim 1, characterized in that: The falling strip devolatilizer comprises a shell, the feed port, the gas outlet and the discharge port are all arranged on the shell, and the liquid distributor and all the heating conductors are located inside the shell.

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