An apparatus for removing alkynes from isoprene production
By introducing a double-disc distribution screen and a multi-layer barrier mesh structure into the alkyne removal unit for isoprene production, the problem of uneven contact between liquid and catalyst was solved, the reaction efficiency and catalyst utilization were improved, and product quality and safety were ensured.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG LUZHONGHUA NEW MATERIALS CO LTD
- Filing Date
- 2025-06-09
- Publication Date
- 2026-06-16
Smart Images
Figure CN224358402U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of isoprene preparation equipment, specifically an alkyne removal device for isoprene production. Background Technology
[0002] Removing alkynes during isoprene production is a crucial step in ensuring product quality and safety. Alkynes (such as isopentenyne and 2-butyne) can cause catalyst poisoning during polymerization, leading to molecular chain breakage or performance degradation in products like isoprene rubber. Therefore, industry standards require that the alkyne content in polymerization-grade isoprene be below 5.0 × 10⁻⁶. -5 Mass fraction. Hydroremoval is a widely used industrial method for removing alkynes. Patents such as CN101244973B (Method for removing alkynes from high-purity isoprene) and CN117486666A (A DMF-based isoprene separation process for efficiently converting alkynes and alkenynes) describe the hydroremoval process. However, these patents primarily focus on the process method and do not adequately describe the hydrogenation reaction vessel. During the hydrogenation reaction, sufficient and uniform contact between the liquid to be treated and the catalyst is crucial for improving reaction efficiency and catalyst utilization. However, currently used tank-type or tray-type liquid distributors do not sufficiently disperse the liquid flow, hindering sufficient and uniform contact between the liquid and the catalyst. Summary of the Invention
[0003] The purpose of this invention is to provide an alkyne removal device for isoprene production, so as to solve the problems existing in the prior art.
[0004] To achieve the above objectives, the present invention provides an alkyne removal device for isoprene production. The alkyne removal device is a hydrogenation reaction tank, comprising a tank body, a liquid distribution unit, and a hydrogenation catalytic reaction layer. The tank body has a liquid inlet and a gas outlet at the top, and a liquid outlet at the bottom. The hydrogenation catalytic reaction layer is located in the middle of the tank body's inner cavity. The liquid distribution unit includes a trough-type distributor and a double-disc distribution screen. The trough-type distributor is located at the top of the tank body, and the double-disc distribution screen is located below the trough-type distributor. The double-disc distribution screen includes an upper disk and a lower disk, both of which are pot-shaped with a circular arc cross-section. The upper disk bulges upwards, and the lower disk bulges downwards. Micropores are evenly distributed on the upper and lower disks.
[0005] Preferably, the hydrogenation catalytic reaction layer includes a catalyst, a catalyst support structure, and several hydrogen inlet pipes, which are arranged at different heights of the hydrogenation catalytic reaction layer.
[0006] Preferably, a placement ring is provided on the upper part of the tank body, and horizontal protruding rings are provided on the upper plate and the edge, with the horizontal protruding rings of the upper plate and the lower plate interlocking and placed on the placement ring.
[0007] Preferably, a plurality of positioning holes are provided on the horizontal protruding rings of the upper and lower plates and the placement ring, wherein the positioning holes of the upper and lower plates are threaded holes, and the upper and lower plates are fastened and fixed by bolts, with the bolts inserted into the positioning holes of the placement ring.
[0008] Preferably, a liquid-blocking ring is provided at the edge of the upper plate, wherein the outer diameter of the bottom of the liquid-blocking ring is smaller than the inner diameter of the tank, and the outer diameter of the top of the liquid-blocking ring is equal to the inner diameter of the tank.
[0009] Preferably, the tray distributor includes a base plate with several slots. Each slot has a gas upward flow chamber. Several liquid discharge pipes are installed on the inner wall of the gas upward flow chamber and fixed to the inner wall. Several liquid inlet holes are installed on the side wall of the gas upward flow chamber in the area where the liquid discharge pipes are located, penetrating the side wall and communicating with the inside of the liquid discharge pipes. A multi-fold cap is installed at the opening above the gas upward flow chamber. The multi-fold cap is fixed to the side wall of the gas upward flow chamber by several connecting rods. The multi-fold cap has multiple bends in the width direction of the gas upward flow chamber, and its edges bend downwards, extending beyond the gas upward flow chamber area.
[0010] Preferably, an inclined inner barrier net is provided inside the gas upflow cavity; an outer barrier net may also be provided in the area below the multi-fold cap, with the center of the outer barrier net bent downwards and both sides welded to the top of the gas upflow cavity or the connecting rod; the inner and outer barrier nets are made of stainless steel mesh.
[0011] The alkyne removal device for isoprene production proposed in this utility model is a hydrogenation reactor. It employs a segmented hydrogen injection method to improve hydrogen utilization. For liquid distribution, a double-disc distribution screen is installed below the tray-type liquid distributor to improve liquid dispersion. Simultaneously, addressing the issue of increased droplets carried by the reaction gas after liquid dispersion, the tray distributor is optimized through detailed optimizations such as multi-layered barrier nets and multi-fold caps to obstruct rising airflow and reduce droplet carry-over. Attached Figure Description
[0012] Figure 1 This is a three-dimensional cross-sectional view of the mechanical delayed linear motion structure under the safety condition according to an embodiment of this utility model.
[0013] Figure 2 This is a cross-sectional view of the mechanical delayed linear motion structure under the safety condition according to an embodiment of this utility model.
[0014] Figure 3 This is a partially enlarged cross-sectional view of the bottom sealing component area of this utility model.
[0015] Figure 4This is a partially enlarged schematic diagram of the base plate area according to an embodiment of the present invention.
[0016] Figure 5 This is an enlarged schematic diagram of the lower liquid tube according to one 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 Figure 1 As shown, the alkyne removal device for isoprene production involved in this utility model is a hydrogenation reaction tank, including a tank body 1, a liquid distribution unit 2, and a hydrogenation catalytic reaction layer 3.
[0019] The upper part of the tank body 1 is provided with a liquid inlet 11 and a gas outlet 12, and the lower part is provided with a liquid outlet 13.
[0020] The hydrogenation catalytic reaction layer 3 is located in the middle of the inner cavity of the tank 1. The hydrogenation catalytic reaction layer 3 includes a catalyst, a catalyst support structure, and a hydrogen inlet pipe 31, etc. Commercially available products can be selected, and their specific structures are conventional knowledge in the field. Based on existing equipment, one embodiment of this application includes several hydrogen inlet pipes 31 positioned at different heights in the hydrogenation catalytic reaction layer 3. This can improve the uniformity of hydrogen distribution in the catalyst, which is beneficial for improving reaction efficiency.
[0021] To achieve sufficient and uniform contact between the liquid and the catalyst, the main technological innovation of this application focuses on improving the liquid distributor. Specifically, the liquid distribution unit 2 includes a tray-type distributor 21 and a double-disc distribution screen 22. The tray-type distributor 21 is located in the upper part of the inner cavity of the tank 1, as shown in the attached figure. Figure 2 As shown, the double-disc distribution screen 22 is set below the grooved disc distributor 21. The double-disc distribution screen 22 includes an upper disc 221 and a lower disc 222. The upper disc 221 and the lower disc 222 are pot-shaped with a circular arc cross-section in the center. The upper disc 221 protrudes upward and the lower disc 222 protrudes downward. Micropores are evenly distributed on the upper disc 221 and the lower disc 222.
[0022] Furthermore, as shown in the attached document. Figure 3 As shown, a placement ring 120 is provided on the upper part of the tank body 1, and horizontal protruding rings 223 are provided at the edges of the upper plate 221 and the lower plate 222. The horizontal protruding rings 223 of the upper plate 221 and the lower plate 222 are interlocked and placed on the placement ring 120.
[0023] To facilitate positioning, several positioning holes are provided on the horizontal protruding ring 223 of the upper plate 221 and the lower plate 222 and the placement ring 120. The positioning holes of the upper plate 221 and the lower plate 222 are threaded holes. The upper plate 221 and the lower plate 222 are fastened and fixed by bolts L, and then the bolts are inserted into the positioning holes of the placement ring 120.
[0024] Furthermore, to prevent liquid from flowing onto the inner wall of the tank 1, a liquid-blocking ring 224 is provided at the edge of the upper plate 221. The outer diameter of the bottom of the liquid-blocking ring is smaller than the inner diameter of the tank 1, and the outer diameter of the top is equal to the inner diameter of the tank 1. While preventing liquid from flowing onto the inner wall of the tank 1, the liquid on the inner wall of the tank 1 can also be guided to the upper part of the upper plate 221 through the liquid-blocking ring 224.
[0025] After being diverted by the tray-type distributor 21, the liquid flows onto the upper plate 221, then flows out through the micropores on it, and then passes through the lower plate 222 for further dispersion, thereby achieving a better dispersion effect.
[0026] To address the issue that the number of droplets carried by the reaction gas increases after the liquid is dispersed, the tray distributor is optimized. This optimized design can also be applied to situations where the tray distributor 21 is not in use.
[0027] As attached Figure 4 , 5 As shown, the tray distributor 21 includes a base plate 210 with several slots. Each slot contains a gas upflow chamber 211. Several liquid downflow pipes 212 are installed on the inner wall of the gas upflow chamber and fixed to it. Several liquid inlet holes are located on the side wall of the gas upflow chamber in the area where the liquid downflow pipes 212 are located, penetrating the side wall and communicating with the inside of the liquid downflow pipes 212. The liquid inlet holes include a lower liquid inlet hole 2111 and an upper overflow hole 2112. The upper part of the liquid downflow pipe 212 is closed.
[0028] A multi-fold cap 213 is provided at the opening above the gas upflow cavity, and the multi-fold cap 213 is fixed to the side wall of the gas upflow cavity through several connecting rods 2131.
[0029] The multi-fold cap 213 covers the opening above the gas upward flow cavity, preventing liquid from flowing directly into the gas upward flow cavity. The multi-fold cap 213 includes multiple bends in the width direction of the gas upward flow cavity. At the same time, the edge of the multi-fold cap 213, which extends out of the gas upward flow cavity area and is located outside the gas upward flow cavity area, bends downward. This allows the upward-flowing airflow to impact the multi-fold cap 213, and the multi-fold guidance reduces the amount of droplets it carries.
[0030] Furthermore, an inclined inner barrier net 2141 is provided inside the gas upflow cavity.
[0031] An outer baffle 2142 can also be provided in the area below the multi-fold cap 213. In the attached drawing, the outer baffle 2142 is bent downward in the center and welded to the top of the gas upflow cavity or the connecting rod 2131 on both sides. The inner baffle 2141 and the outer baffle 2142 are made of fine stainless steel mesh. This can further block the rising airflow and reduce the carry-out of droplets.
[0032] 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. An alkyne removal device for isoprene production, wherein the alkyne removal device is a hydrogenation reactor, characterized in that, The system includes a tank, a liquid distribution unit, and a hydrogenation catalytic reaction layer. The tank has a liquid inlet and a gas outlet at the top and a liquid outlet at the bottom. The hydrogenation catalytic reaction layer is located in the middle of the tank's internal cavity. The liquid distribution unit includes a trough-type distributor and a double-disc distribution screen. The trough-type distributor is located in the upper part of the tank's internal cavity, and the double-disc distribution screen is located below the trough-type distributor. The double-disc distribution screen includes an upper disk and a lower disk, which are pot-shaped with a circular arc cross-section in the center. The upper disk bulges upward, and the lower disk bulges downward. Micropores are evenly distributed on the upper and lower disks.
2. The alkyne removal device for isoprene production according to claim 1, characterized in that, The hydrogenation catalytic reaction layer includes a catalyst, a catalyst support structure, and several hydrogen inlet pipes, which are set at different heights of the hydrogenation catalytic reaction layer.
3. The alkyne removal device for isoprene production according to claim 1, characterized in that, A placement ring is provided on the upper part of the tank body, and horizontal protruding rings are provided on the upper plate and the edge. The horizontal protruding rings of the upper plate and the lower plate are interlocked and placed on the placement ring.
4. The alkyne removal device for isoprene production according to claim 3, characterized in that, Several positioning holes are provided on the horizontal protruding rings and placement rings of the upper and lower plates. The positioning holes of the upper and lower plates are threaded holes. The upper and lower plates are fastened and fixed by bolts, and the bolts are inserted into the positioning holes of the placement rings.
5. The alkyne removal device for isoprene production according to claim 3, characterized in that, A liquid-blocking ring is provided at the edge of the upper plate. The outer diameter of the bottom of the liquid-blocking ring is smaller than the inner diameter of the tank, and the outer diameter of the top of the ring is equal to the inner diameter of the tank.
6. The alkyne removal device for isoprene production according to claim 1, characterized in that, The tray distributor includes a base plate with several slots. Each slot has a gas upward flow chamber. Several liquid discharge pipes are installed on the inner wall of the gas upward flow chamber and are fixed to the inner wall of the upward flow chamber. Several liquid inlet holes are installed on the side wall of the gas upward flow chamber in the area where the liquid discharge pipes are located, penetrating the side wall of the gas upward flow chamber and communicating with the inside of the liquid discharge pipes. A multi-fold cap is installed at the opening above the gas upward flow chamber. The multi-fold cap is fixed to the side wall of the gas upward flow chamber by several connecting rods. The multi-fold cap has multiple bends in the width direction of the gas upward flow chamber, and the edge of the multi-fold cap extends out of the gas upward flow chamber area in the width direction of the gas upward flow chamber and is bent downward.
7. The alkyne removal device for isoprene production according to claim 6, characterized in that, An inclined inner barrier net is provided inside the gas upflow cavity; an outer barrier net can also be provided in the area below the multi-fold cap, with the center of the outer barrier net bent downwards and both sides welded to the top of the gas upflow cavity or the connecting rod; the inner and outer barrier nets are made of stainless steel mesh.