A raw material pretreatment dehydration tower for isoprene rubber production

Abstract

The utility model discloses a raw material pretreatment dehydration tower for isoprene rubber production, including tower body, a plurality of distribution disc, adsorbent, the distribution disc sets up in the tower body, the adsorbent sets up on the upper portion of distribution disc. Be provided with a plurality of regeneration mouth on the tower body, and the regeneration mouth sets up on the upper portion of adsorbent cylinder. The dehydration tower proposed by the utility model carries out sectional arrangement to adsorbent through distribution disc, and the adverse effect of channeling in the adsorption process can be effectively inhibited by the redistribution effect of distribution disc to liquid flow, and the adsorbent arranged in sections can be regenerated in sections, improve the regeneration effect, reduce the time used for regeneration, and be favorable to improve the production efficiency and redundancy of production line.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment, specifically a raw material pretreatment dehydration tower for isoprene rubber production. Background Technology

[0002] Isoprene rubber (IR) is a synthetic rubber polymerized from isoprene monomers. Because its molecular structure and properties are very similar to natural rubber, it is also known as "synthetic natural rubber." Before polymerization, the isoprene monomers need to be dehydrated to avoid adverse effects of water on the catalyst and the polymerization reaction. Adsorption dehydration towers are a common dehydration method. However, during the operation of adsorption dehydration towers, channeling (liquids tend to choose the path of least resistance and flow quickly, forming "channeling") can easily occur, leading to low adsorbent utilization efficiency. Furthermore, during adsorbent regeneration, water removed from the lower layer of adsorbent combines with the upper layer, further reducing the regeneration efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a raw material pretreatment dehydration tower for isoprene rubber production, so as to solve the problems existing in the prior art.

[0004] To achieve the above objectives, the present invention provides a raw material pretreatment dehydration tower for isoprene rubber production, comprising a tower body, several distribution discs, and an adsorbent, wherein the distribution discs are disposed within the tower body and the adsorbent is disposed on the upper part of the distribution discs.

[0005] Furthermore, the dehydration tower also includes several adsorbent cylinders, each of which is a cylindrical structure with an opening at the top and an array of openings on the bottom surface, and the adsorbent is placed inside the adsorbent cylinder.

[0006] Furthermore, the distribution disk is disposed between the two adsorbent cylinders.

[0007] Furthermore, the distribution plate includes an annular wall, an overflow distribution upper plate, and a permeable distribution lower plate. The overflow distribution upper plate is disposed in the upper middle part of the annular wall, and a plurality of through holes are arranged in an array on the overflow distribution upper plate. An overflow ring is disposed at each of the through holes, and the top surface of the overflow ring is lower than the top surface of the annular wall. The permeable distribution lower plate is disposed in the annular wall below the overflow distribution upper plate, and a drain hole is arranged in an array on the permeable distribution lower plate.

[0008] Furthermore, several regeneration ports are provided on the tower body, and the regeneration ports are located on the upper part of the adsorbent cylinder.

[0009] Furthermore, an opening is provided at the upper part of the adsorbent cylinder for connection to the regeneration port. The adsorbent cylinder also includes a connecting pipe with threads on the outside, which are threaded to engage with the opening at the upper part of the adsorbent cylinder and the inner wall of the regeneration port. A tightening rod is provided inside the connecting pipe, with both ends of the tightening rod connected to the inner wall of the connecting pipe.

[0010] Furthermore, a spiral baffle plate is provided on the inner wall of the adsorbent cylinder. The width of the spiral baffle plate is 5-10cm, and raised baffle plates are provided on the spiral baffle plate at certain angles.

[0011] The dehydration tower proposed in this invention arranges the adsorbent in segments using a distribution plate. The distribution plate's effect on re-distributing the liquid flow can effectively suppress the adverse effects of channeling during adsorption. At the same time, the segmented adsorbent can be regenerated in segments, improving the regeneration effect, reducing the regeneration time, and thus improving the production efficiency and redundancy of the production line. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall design of this utility model.

[0013] Figure 2 This is a partial cross-sectional view of the distribution disk according to an embodiment of the present invention.

[0014] Figure 3 This is a cross-sectional view of the regeneration port area according to an embodiment of this utility model.

[0015] Figure 4 This is a partial cross-sectional view of the distribution disk according to another embodiment of the present invention.

[0016] Figure 5 This is a partially enlarged view of the adsorbent cartridge according to another embodiment of the present invention. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] As attached Figures 1-2 As shown, the dehydration tower involved in this utility model includes a tower body 1, several distribution discs 2, and an adsorbent 3. The tower body 1 is a rotary cavity structure, including common necessary structures of dehydration towers, such as liquid inlet, liquid outlet, liquid distributor, etc. These related structures are existing technical solutions in the field and are not within the scope of protection of this application.

[0019] The distribution plate 2 is disposed inside the tower body 1, and the adsorbent 3 is disposed on the upper part of the distribution plate 2.

[0020] As attached Figure 1 As shown, to facilitate the loading and subsequent replacement of the adsorbent, the dehydration tower also includes an adsorbent cylinder 4. The adsorbent cylinder 4 is a cylindrical structure with an opening at the top and an array of openings on the bottom surface for liquid flow and regeneration gas flow. The adsorbent 3 is placed inside the adsorbent cylinder 4.

[0021] Appendix Figure 1 The device contains two adsorbent cylinders 4 and a distribution plate 2. The distribution plate 2 is positioned between the two adsorbent cylinders 4.

[0022] As attached Figure 1 As shown in Figure 2, the distribution plate 2 includes an annular wall 21, an overflow distribution upper plate 22, and a permeable distribution lower plate 23. The overflow distribution upper plate 22 is located in the upper middle part of the annular wall 21. A plurality of through holes 221 are arranged in an array on the overflow distribution upper plate 22, and an overflow ring 222 is arranged at the through holes. The top surface of the overflow ring 222 is lower than the top surface of the annular wall 21. The permeable distribution lower plate 23 is located in the annular wall 21 below the overflow distribution upper plate 22, and a drain hole 231 is arranged in an array on the permeable distribution lower plate 23.

[0023] After the liquid flows through the adsorbent 3 above the distribution plate 2, it flows into the overflow distribution upper plate 22. As the liquid level increases, the liquid flows through the overflow ring 222 into the through hole 221, and after being distributed by the water-permeable distribution lower plate 23, it flows into the lower section of the adsorbent cylinder. The distribution plate 2 enables secondary distribution of the liquid flow, reducing the impact of channeling.

[0024] To further improve the distribution effect of distribution disk 2, as shown in the attached... Figure 4 As shown, a distribution mesh plate 223 is set inside the overflow ring 222, which can perform secondary distribution of water flow. This improves the distribution effect while reducing the number of through holes 221 and overflow ring 222, thus reducing the cost of the distribution plate 2.

[0025] The distribution mesh plate 223 has a downwardly convex frustum shape in cross-section, with its side inclined at an angle of 5-10 degrees to the horizontal plane. The distribution mesh plate 223 is provided with an array of upper and lower water holes 2231. The arrangement of the distribution mesh plate 223 further disperses the liquid flow from the overflow ring 222. Furthermore, the distribution density of the upper and lower water holes 2231 can gradually increase from the outside to the inside.

[0026] It should be noted that the appendix Figure 2 In section 4, the distribution density of drainage hole 231 and drainage holes 2231 is only for illustration and does not constitute a limitation on their specific distribution density.

[0027] The adsorbent 3 above and below the distribution disk 2 can be one or more types. In one embodiment of this application, the adsorbent above the distribution disk 2 is alumina, and the adsorbent below is molecular sieve. This can make full use of the economy and high adsorption capacity of alumina and the deep drying characteristics of molecular sieve, thereby extending the adsorbent life and reducing the overall operating cost.

[0028] As attached Figure 1 , 3 As shown, to improve the regeneration efficiency of the adsorbent, several regeneration ports 11 are provided on the tower body 1. These ports 11 are located on the upper part of the adsorbent cylinder 4. During regeneration, the water vapor released during the regeneration process of this section of the adsorbent is drawn out through a duct, reducing the influence of the upper adsorbent or other components. This achieves a certain degree of segmented regeneration, improving the regeneration effect, reducing regeneration time, and thus improving the production line's efficiency and redundancy. To reduce system energy consumption, the high-temperature gas generated during the dehydration tower regeneration is directly introduced into the preheating tank.

[0029] An opening is provided on the upper part of the adsorbent cylinder 4 for docking with the regeneration port 11. The adsorbent cylinder 4 also includes a connecting pipe 41. The outer side of the connecting pipe is provided with threads, which are threaded to the upper opening of the adsorbent cylinder 4 and the inner wall of the regeneration port 11. A tightening rod 411 is provided inside the connecting pipe 41. Both ends of the tightening rod 411 are connected to the inner wall of the connecting pipe 41. The connecting pipe 41 can be installed by tightening the tightening rod 411.

[0030] Furthermore, since the adsorbent is granular, there will inevitably be relatively regular gaps between it and the inner wall of the adsorbent cylinder 4, which easily forms channeling, such as... Figure 5 As shown, the inner wall of the adsorbent cylinder 4 of this application is provided with a spiral baffle plate 42. The width of the spiral baffle plate 42 is 5-10cm. Protruding baffle plates 421 are provided on the spiral baffle plate 42 at certain angles. The liquid flow along the inner wall of the adsorbent cylinder will flow inward under the action of the spiral baffle plate 42. At the same time, the protruding baffle plates 421 can also prevent the liquid flow from "smoothly" flowing out along the spiral baffle plate 42.

[0031] It should be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A raw material pretreatment dehydration tower for isoprene rubber production, characterized in that, It includes a tower body, several distribution discs, and an adsorbent, wherein the distribution discs are disposed inside the tower body and the adsorbent is disposed on the upper part of the distribution discs; The distribution plate is disposed between two adsorbent cylinders; the distribution plate includes an annular wall, an overflow distribution upper plate, and a water-permeable distribution lower plate. The overflow distribution upper plate is disposed in the upper middle part of the annular wall, and several through holes are arranged in an array on the overflow distribution upper plate. An overflow ring is disposed at the through hole, and the top surface of the overflow ring is lower than the top surface of the annular wall. The water-permeable distribution lower plate is disposed in the annular wall below the overflow distribution upper plate, and drainage holes are arranged in an array on the water-permeable distribution lower plate.

2. The dehydration tower according to claim 1, characterized in that, The dehydration tower also includes several adsorbent cylinders, each of which is a cylindrical structure with an opening at the top and an array of openings on the bottom surface. The adsorbent is placed inside the adsorbent cylinder.

3. The dehydration tower according to claim 1, characterized in that, Several regeneration ports are provided on the tower body, and the regeneration ports are located on the upper part of the adsorbent cylinder.

4. The dehydration tower according to claim 3, characterized in that, An opening is provided at the upper part of the adsorbent cylinder for connection to the regeneration port. The adsorbent cylinder also includes a connecting pipe with threads on the outside, which are threaded to the opening at the upper part of the adsorbent cylinder and the inner wall of the regeneration port. A tightening rod is provided inside the connecting pipe, with both ends of the tightening rod connected to the inner wall of the connecting pipe.

5. The dehydration tower according to claim 2, characterized in that, The inner wall of the adsorbent cylinder is provided with a spiral baffle plate, the width of which is 5-10cm. Protruding baffle plates are provided on the spiral baffle plate at certain angles.

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