Device and method for recovering isobutene in tert-butyl acrylate reaction process

Abstract

The invention relates to the technical field of isobutene recovery, and discloses a device and a method for recovering isobutene in a tert-butyl acrylate reaction process, the device and the method are used for separating and recovering isobutene generated in the tert-butyl acrylate reaction process, the device comprises a recovery tank, and the recovery tank is used for recovering gas isobutene. The top end of the isobutene is fixedly connected with a separation tank, the top end of the separation tank is fixedly connected with a feeding pipe, the feeding pipe is used for being in butt joint with a flash tank, and the right side face of the recovery tank is fixedly connected with an exhaust pipe. And the porous baffle plate can adsorb liquid isobutene, so that the isobutene is more convenient to gather, the cyclone plate is in contact with the isobutene, so that the isobutene generates cyclone to be further gathered, and the compression efficiency of the isobutene is further promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of isobutene recovery, and particularly to an isobutene recovery device and method during the reaction process of tert-butyl acrylate. Background Art

[0002] During the production process of tert-butyl acrylate, isobutene, as a key raw material or by-product, its recovery and utilization are crucial for the process economy and environmental protection. In traditional processes, unreacted isobutene is usually recovered by absorption, compression condensation, or distillation, etc., but there are problems such as high energy consumption, low recovery rate, or insufficient purity.

[0003] The patent with the publication number CN209500833U discloses an isobutene recovery device. This patent includes a flash tank and a recovery tank. The tank body of the recovery tank is of a double-layer structure, and the interlayer of the double-layer structure is in a vacuum state. There are four connecting pipes on the tank body of the recovery tank, namely a feed pipe, an air extraction pipe, a pressurizing pipe, and a discharge pipe. The connecting pipes are of a double-layer structure. One-way valves are installed on the feed pipe, the air extraction pipe, the pressurizing pipe, and the discharge pipe. The feed pipe is connected to the steam outlet of the flash tank, the air extraction pipe is connected to a vacuum pumping device, the pressurizing pipe is connected to a gas compressor, and the gas compressor injects inert gas into the recovery tank. A pressure gauge is provided on the tank body of the recovery tank. The boiling points of isobutene and tert-butyl acetate differ greatly. Through the flash tank, the low-boiling-point isobutene quickly turns into gas and then enters the recovery tank for liquefaction and storage, making the subsequent reaction operations more stable. The recovered isobutene can be used for other purposes or returned to the original reaction to improve resource utilization rate. However, the above device still has the problem that the compression efficiency is not high enough when isobutene is recovered after being generated by the reaction of tert-butyl acrylate in the flash tank. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an isobutene recovery device and method during the reaction process of tert-butyl acrylate in view of the above-mentioned deficiencies in the prior art.

[0005] To solve the above technical problem, the technical solution adopted by the present invention is: An isobutene recovery device during the reaction process of tert-butyl acrylate, which is used to separate and recover isobutene generated during the reaction process of tert-butyl acrylate, includes: A recovery tank for recovering gaseous isobutene. A separation tank is fixedly connected to the top of the isobutene. A feed pipe is fixedly connected to the top of the separation tank and is used to dock with a flash tank. An air extraction pipe is fixedly connected to the right side of the recovery tank and is used to dock with a vacuum pump to extract the air in the recovery tank to make the recovery tank in a vacuum state. A pressurizing pipe is fixedly connected to the right side of the recovery tank and is used to dock with a compressor to compress the isobutene in the recovery tank into a liquid; Excess liquid recovery device, the excess liquid recovery device is arranged on the top of the recovery tank, and the excess liquid recovery device is used to separate the residual moisture in isobutene; Anti-polymerization device, the anti-polymerization device is arranged on the top of the recovery tank, and the anti-polymerization device is used to prevent isobutene from polymerizing during the compression process.

[0006] As a further technical solution, the recovery tank includes; Main shaft, the main shaft is rotatably connected to the inner wall of the bottom end; Porous baffle plate, the porous baffle plate is fixedly connected to the inner wall of the recovery tank, the porous baffle plate is used to enhance the resistance during the compression of isobutene, improve the compression efficiency, the porous baffle plate is used to adsorb liquid isobutene to improve the aggregation efficiency of isobutene, and a plurality of through holes are opened on the porous baffle plate for adsorbing liquefied isobutene and allowing isobutene to flow downward through the through holes; Discharge pipe, the discharge pipe is fixedly connected to the bottom surface of the recovery tank.

[0007] As a further technical solution, the recovery tank further includes; Limit semi-ring, the limit semi-ring is fixedly connected to the side of the porous baffle plate close to the main shaft; Swirl plate, the swirl plate is fixedly connected to the circumferential surface of the main shaft, an extension rod is fixedly connected to the lower surface of the swirl plate, a connecting plate is fixedly connected to the bottom end of the extension rod, and a water scraping plastic is fixedly connected to the lower surface of the connecting plate, and the water scraping plastic is used to scrape off the liquid isobutene adhering to the upper surface of the porous baffle plate, improve the efficiency of aggregating liquid isobutene to the bottom of the recovery tank, and facilitate liquid discharge.

[0008] As a further technical solution, the main shaft is rotatably connected to the inner wall of the limit semi-ring, the water scraping plastic abuts against the upper surface of the porous baffle plate, the main shaft is rotatably connected to the side surface of the porous baffle plate, a motor is fixedly connected to the bottom end of the main shaft, and the motor is fixedly connected to the lower surface of the recovery tank.

[0009] As a further technical solution, the excess liquid recovery device includes; Water absorption sieve, the water absorption sieve is fixedly connected to the inner wall of the separation tank, honeycomb-shaped through holes are opened inside the water absorption sieve for adsorbing the residual moisture flowing into the recovery tank together with isobutene from the flash tank, and a solid column is fixedly connected to the inner wall of the water absorption sieve; Slide rail, the slide rail is fixedly connected to the inner wall of the recovery tank, an annular plate is rotatably connected to the inner wall of the slide rail, and a water storage hopper is fixedly connected to the inner wall of the annular plate, and the water storage hopper is used to receive the water dripping from the water absorption sieve.

[0010] As a further technical solution, the excess liquid recovery device further includes; Gas pipeline, the gas pipeline is fixedly connected to the inner wall of the bottom end of the water storage hopper, the gas pipeline is used to transfer gaseous isobutene above the water storage hopper to below the water storage hopper, the top end of the gas pipeline is fixedly connected with a suction disc, and an air inlet groove is provided on the conical surface of the suction disc. When the water droplets in the water absorption sieve fall into the water storage hopper and gather, the gaseous isobutene gathers near the suction disc under the influence of pressure and flows into the suction disc and the gas pipeline through the air inlet groove and finally flows to below the water storage hopper through the gas pipeline; U-shaped connecting rod, the U-shaped connecting rod is fixedly connected to the top end of the main shaft.

[0011] As a further technical solution, the suction disc is rotatably connected to the lower surface of the water absorption sieve, and the top end of the U-shaped connecting rod is fixedly connected to the bottom end of the water storage hopper.

[0012] As a further technical solution, the anti-polymerization device includes; Medicine inlet pipe, the medicine inlet pipe is fixedly connected to the inner wall of the top end of the recovery tank, and the medicine inlet pipe is used to input the polymerization inhibitor into the recovery tank; Connecting pipe, the connecting pipe is fixedly connected to the outer conical surface of the water storage hopper, and a spray head is arranged below the connecting pipe.

[0013] As a further technical solution, the anti-polymerization device further includes; Annular medicine spraying groove, the annular medicine spraying groove is fixedly connected to the bottom end of the connecting pipe, and the annular medicine spraying groove is used to increase the spraying range of the polymerization inhibitor; Limit clamping plate, the limit clamping plate is fixedly connected to the circumferential surface of the annular medicine spraying groove; Guide rail, the guide rail is fixedly connected to the inner wall of the recovery tank; Inner sleeve, the inner sleeve is fixedly connected to the inner conical surface of the water storage hopper.

[0014] As a further technical solution, the spray head is fixedly connected to the lower surface of the annular medicine spraying groove, the limit clamping plate is rotatably connected to the inner wall of the guide rail, and the inner sleeve is rotatably connected to the top surface of the inner wall of the recovery tank.

[0015] A recovery method for an isobutene recovery device during the reaction process of tert-butyl acrylate, including the following steps: Step 1: First, evacuate the inside of the recovery tank through a vacuum pump and an extraction pipe to generate a negative pressure inside the recovery tank and suck isobutene. The isobutene after flash evaporation is attracted by the suction force and flows into the separation tank through the feed pipe; Step 2: Then, the isobutene in the separation tank flows into the recovery tank. At this time, the isobutene in the recovery tank is compressed into a liquid state and stored at the bottom of the recovery tank through a compressor and a pressure pipe; Step 3: Subsequently, add the polymerization inhibitor into the recovery tank through the medicine inlet pipe to mix with the isobutene to prevent the isobutene from polymerizing during the liquefaction process; Step 4: Finally, when subsequent treatment of the liquefied isobutene is required, open the discharge pipe and dock the discharge pipe with the subsequent treatment device to complete the discharge.

[0016] Adopting the above technical solutions, the present invention can bring the following beneficial effects: 1. In the isobutene recovery device during the reaction of tert-butyl acrylate, after the gaseous isobutene is blocked by the porous baffle, its flow rate slows down, the gas becomes more concentrated, thereby improving the compression efficiency. Moreover, the porous baffle absorbs the liquefied isobutene through the adsorption property of the metal surface, facilitating the convergence of isobutene. When the swirl plate rotates, it stirs the gaseous isobutene, causing the isobutene to generate a swirl and further concentrating, which further promotes the compression efficiency of isobutene. When the water scraping plastic rotates circumferentially, the liquefied isobutene accumulated on the upper surface of the porous baffle is scraped to the bottom of the recovery tank. By multi-aggregating isobutene in both gaseous and liquid states, the compression efficiency of isobutene is ultimately improved.

[0017] 2. In the isobutene recovery device during the reaction of tert-butyl acrylate, isobutene flows into the upper part of the water storage hopper through the through holes opened on the water absorption sieve. The non-isobutene moisture contained in it is adsorbed by the inner wall of the through hole and slides down from the through hole to the bottom of the water storage hopper, separating isobutene from the residual moisture after flash evaporation, preventing the mixing of isobutene with other components of moisture during the compression of isobutene into a liquid state, which is not conducive to subsequent recycling. The air delivery pipe and the suction disc block the residual moisture, preventing components other than isobutene from entering the recovery tank. The U-shaped connecting rod drives the water storage hopper to rotate, and the rotation of the water storage hopper generates centrifugal force, causing the moisture falling on its inner conical surface to quickly converge to the bottom, preventing the liquid from mixing with isobutene again and affecting the recovery purity of isobutene.

[0018] 3. In the isobutene recovery device during the reaction of tert-butyl acrylate, the polymerization inhibitor in the annular medicine spraying tank is sprayed into the recovery tank through the nozzle to react with isobutene, preventing isobutene from polymerizing to produce polymers and affecting the recovery effect. Moreover, when the polymerization inhibitor falls on the water storage hopper, it is blocked by the inner sleeve, preventing it from mixing with the moisture separated from isobutene. When the annular medicine spraying tank rotates, it generates centrifugal force, causing the internal polymerization inhibitor to shake evenly, and then enabling the polymerization inhibitor to be more evenly sprayed into the recovery tank to fully react with isobutene, improving the polymerization inhibition effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the overall three-dimensional structure schematic diagram of the present invention; Figure 2 is the front side three-dimensional semi-sectional structure schematic diagram of the present invention; Figure 3 is the front side three-dimensional semi-sectional structure schematic diagram of the recovery tank of the present invention; Figure 4 is of the present invention Figure 3 the enlarged structure schematic diagram of A in; Figure 5 Schematic diagram of the front side stereoscopic half-section structure of the redundant liquid recovery device of the present invention; Figure 6 Schematic diagram of the side bottom stereoscopic half-section structure of the anti-polymerization device of the present invention; Figure 7 For the present invention Figure 6 Enlarged structure diagram of B in

[0020] In the figure: 1, recovery tank; 2, separation tank; 3, feed pipe; 4, extraction pipe; 5, pressurizing pipe; 6, main shaft; 7, porous baffle; 8, redundant liquid recovery device; 9, anti-polymerization device; 10, discharge pipe; 11, limiting semi-ring; 12, swirl plate; 13, extension rod; 14, connecting plate; 15, water scraping plastic; 81, water absorption sieve; 82, solid column; 83, slide rail; 84, annular plate; 85, water storage hopper; 86, gas transmission pipe; 87, air suction disc; 88, air inlet groove; 89, U-shaped connecting rod; 91, medicine inlet pipe; 92, communicating pipe; 93, spray head; 94, annular medicine spraying groove; 95, limiting clamping plate; 96, guide rail; 97, inner sleeve. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to Figures 1-7, an embodiment of the present invention is: a device for recovering isobutene during the reaction process of tert-butyl acrylate, which is used to separate and recover isobutene generated during the reaction process of tert-butyl acrylate. It includes a recovery tank 1 for recovering gaseous isobutene. A separation tank 2 is fixedly connected to the top of the isobutene. A feed pipe 3 is fixedly connected to the top of the separation tank 2, and the feed pipe 3 is used to dock with a flash tank. A suction pipe 4 is fixedly connected to the right side of the recovery tank 1, and the suction pipe 4 is used to dock with a vacuum pump to extract the air in the recovery tank 1 to make the recovery tank 1 in a vacuum state. A pressure pipe 5 is fixedly connected to the right side of the recovery tank 1 for docking with a compressor, so as to compress the isobutene in the recovery tank 1 into a liquid. An excess liquid recovery device 8 is arranged on the top of the recovery tank 1, and the excess liquid recovery device 8 is used to separate the residual water in the isobutene. An anti-polymerization device 9 is arranged on the top of the recovery tank 1, and the anti-polymerization device 9 is used to prevent the polymerization of isobutene during the compression process. The gaseous isobutene is blocked by the porous baffle 7, which improves the compression efficiency, and the porous baffle 7 can adsorb the liquid isobutene, making it more convenient for the isobutene to aggregate. The cyclone plate 12 contacts with the isobutene to make the isobutene generate a swirl and further aggregate, thereby further promoting the compression efficiency of the isobutene. The recovery tank 1 includes a main shaft 6, and the main shaft 6 is rotatably connected to the inner wall at the bottom end. The porous baffle 7 is fixedly connected to the inner wall of the recovery tank 1. The porous baffle 7 is used to enhance the resistance during the compression of isobutene and improve the compression efficiency. The porous baffle 7 is used to adsorb the liquid isobutene to improve the aggregation efficiency of the isobutene. A plurality of through holes are provided on the porous baffle 7 for adsorbing the liquefied isobutene and allowing the isobutene to flow downward through the through holes. A discharge pipe 10 is fixedly connected to the bottom surface of the recovery tank 1. The recovery tank 1 further includes a limit semi-ring 11, and the limit semi-ring 11 is fixedly connected to the side of the porous baffle 7 close to the main shaft 6. The cyclone plate 12 is fixedly connected to the circumferential surface of the main shaft 6. An extension rod 13 is fixedly connected to the lower surface of the cyclone plate 12, and a connecting plate 14 is fixedly connected to the bottom end of the extension rod 13. A water scraping plastic 15 is fixedly connected to the lower surface of the connecting plate 14, and the water scraping plastic 15 is used to scrape off the liquid isobutene adhering to the upper surface of the porous baffle 7, improving the efficiency of aggregating the liquid isobutene to the bottom of the recovery tank 1 and facilitating liquid discharge. The main shaft 6 is rotatably connected to the inner wall of the limit semi-ring 11, the water scraping plastic 15 abuts against the upper surface of the porous baffle 7, the main shaft 6 is rotatably connected to the side surface of the porous baffle 7, and a motor is fixedly connected to the bottom end of the main shaft 6, and the motor is fixedly connected to the lower surface of the recovery tank 1. When the water scraping plastic 15 rotates circumferentially, it contacts the upper surface of the porous baffle 7, thereby scraping off the liquid isobutene aggregated on the upper surface of the porous baffle 7 and further improving the efficiency of the liquid isobutene converging to the bottom of the recovery tank 1.

[0023] Working principle: The vacuum pump and the suction pipe 4 are used to evacuate the recovery tank 1 to create a negative pressure inside the recovery tank 1 to suck isobutene. The isobutene after flash evaporation is guided by the suction force to flow into the separation tank 2 through the feed pipe 3, and then flows into the recovery tank 1 through the separation tank 2. At this time, the compressor and the pressure pipe 5 are used to compress the isobutene in the recovery tank 1 into a liquid state and accumulate it at the bottom of the recovery tank 1. Opening the discharge pipe 10 can discharge the liquid isobutene from the recovery tank 1. During the process of the isobutene flowing towards the bottom of the recovery tank 1, it contacts the porous baffle 7. The gaseous isobutene is blocked by the porous baffle 7, which improves the compression efficiency. Moreover, the porous baffle 7 can adsorb the liquid isobutene, making it more convenient for the isobutene to gather. The isobutene that aggregates into a liquid on the porous baffle 7 flows downward through the through holes to converge in the recovery tank 1 to complete the liquefaction recovery. Start the motor, the motor drives the main shaft 6 to rotate within the limit half-ring 11, the main shaft 6 drives the swirl plate 12 to rotate, and the contact between the swirl plate 12 and the isobutene causes the isobutene to generate a swirl and further aggregate, thereby further promoting the compression efficiency of the isobutene. When the swirl plate 12 rotates, it drives the extension rod 13 to rotate circumferentially, the extension rod 13 drives the connecting plate 14 to rotate circumferentially, and the connecting plate 14 drives the wiper plastic 15 to rotate circumferentially. When the wiper plastic 15 rotates circumferentially, it contacts the upper surface of the porous baffle 7, and then scrapes the liquid isobutene aggregated on the upper surface of the porous baffle 7 downward, further improving the efficiency of the liquid isobutene converging to the bottom of the recovery tank 1.

[0024] Please refer to Figures 1-7, on the basis of the above embodiments, in another embodiment of the present invention, the excess liquid recovery device 8 includes a water absorption sieve 81, which is fixedly connected to the inner wall of the separation tank 2. The inner side of the water absorption sieve 81 is provided with honeycomb-shaped through holes for adsorbing the residual moisture that flows into the recovery tank 1 together with isobutene from the flash tank. A solid column 82 is fixedly connected to the inner wall of the water absorption sieve 81. A slide rail 83 is fixedly connected to the inner wall of the recovery tank 1. An annular plate 84 is rotatably connected to the inner wall of the slide rail 83. A water storage hopper 85 is fixedly connected to the inner wall of the annular plate 84. The water storage hopper 85 is used to receive the water dripping from the water absorption sieve 81. Isobutene flows into the space above the water storage hopper 85 in the recovery tank 1 through the through holes provided in the water absorption sieve 81, while the residual moisture is adsorbed and gathered on the inner wall of the through holes and slides down from the through holes to the bottom of the water storage hopper 85, improving the separation effect of isobutene and preventing the mixing of water with other components during the compression of isobutene into a liquid state, which is not conducive to subsequent recycling. The excess liquid recovery device 8 further includes an air delivery pipe 86, which is fixedly connected to the inner bottom wall of the water storage hopper 85. The air delivery pipe 86 is used to transfer the gaseous isobutene above the water storage hopper 85 to the lower part of the water storage hopper 85. The top end of the air delivery pipe 86 is fixedly connected with an air suction disc 87. An air intake groove 88 is provided on the conical surface of the air suction disc 87. When the water droplets in the water absorption sieve 81 fall into the water storage hopper 85 and gather, the gaseous isobutene gathers near the air suction disc 87 under the influence of pressure and flows into the air suction disc 87 and the air delivery pipe 86 through the air intake groove 88 and finally flows to the lower part of the water storage hopper 85 through the air delivery pipe 86. A U-shaped connecting rod 89 is fixedly connected to the top end of the main shaft 6. The air suction disc 87 is rotatably connected to the lower surface of the water absorption sieve 81. The top end of the U-shaped connecting rod 89 is fixedly connected to the bottom end of the water storage hopper 85. The air delivery pipe 86 and the air suction disc 87 block the residual moisture and prevent components other than isobutene from entering the recovery tank 1. The U-shaped connecting rod 89 drives the water storage hopper 85 and the annular plate 84 to rotate in the slide rail 83. The rotation of the water storage hopper 85 generates a centrifugal force to quickly gather the water falling on its inner conical surface to the bottom, preventing the liquid from mixing with isobutene again and affecting the recovery purity of isobutene.

[0025] Working principle: The isobutene after flashing and the residual water mixed therein enter the separation tank 2 and come into contact with the water-absorbing sieve 81. The isobutene flows into the space above the water storage hopper 85 in the recovery tank 1 through the through holes opened on the water-absorbing sieve 81. The residual water is adsorbed and gathered on the inner wall of the through holes and slides down from the through holes to the bottom of the water storage hopper 85, improving the separation effect of isobutene and preventing the mixture of water with other components during the compression of isobutene into a liquid state, which is not conducive to subsequent recycling. The gaseous isobutene accumulates near the suction disc 87. The isobutene flows into the suction disc 87 and the air delivery pipe 86 from the air inlet groove 88, and finally flows to the lower part of the water storage hopper 85 through the air delivery pipe 86. The air delivery pipe 86 and the suction disc 87 block the residual water and prevent components other than isobutene from entering the recovery tank 1. The main shaft 6 rotates to drive the U-shaped connecting rod 89 to rotate. The U-shaped connecting rod 89 drives the water storage hopper 85 and the annular plate 84 to rotate in the slide rail 83. The rotation of the water storage hopper 85 generates a centrifugal force, causing the water falling on its inner conical surface to quickly gather at the bottom, preventing the liquid from mixing with isobutene again and affecting the recovery purity of isobutene.

[0026] Please refer to Figures 1-7 , on the basis of the above-mentioned embodiment, in another embodiment of the present invention, the anti-polymerization device 9 includes a chemical feeding pipe 91. The chemical feeding pipe 91 is fixedly connected to the inner wall of the top end of the recovery tank 1. The chemical feeding pipe 91 is used to input the polymerization inhibitor into the recovery tank 1. A connecting pipe 92 is fixedly connected to the outer conical surface of the water storage hopper 85. A spray head 93 is arranged below the connecting pipe 92. The polymerization inhibitor in the annular spraying groove 94 is sprayed into the recovery tank 1 through the spray head 93 to react with the isobutene, preventing the polymerization of isobutene to produce polymers and affecting the recovery efficiency. When the polymerization inhibitor falls on the water storage hopper 85, it is combined by the inner sleeve 97 to prevent it from mixing with water. The anti-polymerization device 9 further includes an annular spraying groove 94. The annular spraying groove 94 is fixedly connected to the bottom end of the connecting pipe 92. The annular spraying groove 94 is used to increase the spraying range of the polymerization inhibitor. A limit clamping plate 95 is fixedly connected to the circumferential surface of the annular spraying groove 94. A guide rail 96 is fixedly connected to the inner wall of the recovery tank 1. An inner sleeve 97 is fixedly connected to the inner conical surface of the water storage hopper 85. The lower surface of the spray head 93 and the annular spraying groove 94 are fixedly connected. The limit clamping plate 95 is rotatably connected to the inner wall of the guide rail 96. The inner sleeve 97 is rotatably connected to the top surface of the inner wall of the recovery tank 1. When the annular spraying groove 94 rotates, a centrifugal force is generated, causing the polymerization inhibitor inside to shake evenly, so that the polymerization inhibitor can be evenly sprayed into the recovery tank 1 and fully react with the isobutene, improving the anti-polymerization effect.

[0027] Working principle: The inhibitor is added into the recovery tank 1 through the chemical feeding pipe 91. After the inhibitor falls onto the water storage hopper 85, it then falls into the annular chemical spraying groove 94 through the connecting pipe 92. The inhibitor in the annular chemical spraying groove 94 is then sprayed into the recovery tank 1 through the nozzle 93 to react with isobutene, preventing the polymerization of isobutene to produce polymers and affecting the recovery efficiency. Moreover, when the inhibitor falls onto the water storage hopper 85, it is prevented from mixing with water by the inner sleeve 97 assembly. When the water storage hopper 85 rotates, it drives the connecting pipe 92 to rotate circumferentially. The connecting pipe 92 drives the annular chemical spraying groove 94 to rotate. The annular chemical spraying groove 94 rotates in the guide rail 96 through the limit clamping plate 95 to maintain balance. When the annular chemical spraying groove 94 rotates, a centrifugal force is generated, which causes the inhibitor inside to shake evenly. As a result, the inhibitor can be evenly sprayed into the recovery tank 1 and react fully with isobutene, improving the inhibition effect.

[0028] The present invention provides a device for recovering isobutene during the reaction process of tert-butyl acrylate. There are many methods and ways to specifically implement this technical solution. The above description is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention. Each component not clearly defined in this embodiment can be realized by using existing technologies.

Claims

1. An isobutylene recovery device in the reaction process of tert-butyl acrylate, characterized in that: include: A recovery tank (1), the recovery tank (1) being used to recover gaseous isobutylene, the top of the isobutylene being fixedly connected to a separation tank (2), the top of the separation tank (2) being fixedly connected to a feed pipe (3), the feed pipe (3) being used to dock with a flash tank, the right side of the recovery tank (1) being fixedly connected to an exhaust pipe (4), the exhaust pipe (4) being used to dock with a vacuum pump to extract air from the recovery tank (1) so that the recovery tank (1) is in a vacuum state, the right side of the recovery tank (1) being fixedly connected to a pressurizing pipe (5) being used to dock with a compressor, thereby compressing the isobutylene in the recovery tank (1) into liquid; An excess liquid recovery device (8), the excess liquid recovery device (8) being arranged on the top of the recovery tank (1), and the excess liquid recovery device (8) being used to separate the residual water in the isobutylene; An anti-polymerization device (9), the anti-polymerization device (9) being arranged on the top of the recovery tank (1), and the anti-polymerization device (9) being used to prevent isobutylene from polymerizing during the compression process; The recovery tank (1) comprises: A main shaft (6), the main shaft (6) being rotatably connected to the inner wall of the bottom end; A porous baffle (7), the porous baffle (7) being fixedly connected to the inner wall of the recovery tank (1), the porous baffle (7) being used to increase the resistance during compression of isobutylene and improve the compression efficiency, the porous baffle (7) being used to adsorb liquid isobutylene and improve the isobutylene aggregation efficiency, and the porous baffle (7) being provided with a plurality of through holes for adsorbing liquefied isobutylene and allowing the isobutylene to flow downward through the through holes; A discharge pipe (10), wherein the discharge pipe (10) is fixedly connected to the bottom surface of the recovery tank (1).

2. The isobutylene recovery device in the reaction process of tert-butyl acrylate according to claim 1, characterized in that: The recovery tank (1) further comprises: A limiting semi-ring (11), wherein the limiting semi-ring (11) is fixedly connected to a side of the porous baffle (7) close to the main shaft (6); A swirl plate (12), the swirl plate (12) being fixedly connected to the circumferential surface of the main shaft (6), the lower surface of the swirl plate (12) being fixedly connected to an extension rod (13), the bottom end of the extension rod (13) being fixedly connected to a connecting plate (14), the lower surface of the connecting plate (14) being fixedly connected to a scraper plastic (15), the scraper plastic (15) being used to scrape off liquid isobutylene adhering to the upper surface of the porous baffle plate (7), thereby improving the efficiency of the liquid isobutylene gathering at the bottom of the recovery tank (1) and facilitating liquid discharge.

3. The isobutylene recovery device in the reaction process of tert-butyl acrylate according to claim 2, characterized in that: The main shaft (6) is rotatably connected to the inner wall of the limiting semi-ring (11), the wiper plastic (15) is in contact with the upper surface of the porous baffle (7), the main shaft (6) is rotatably connected to the side surface of the porous baffle (7), the bottom end of the main shaft (6) is fixedly connected to a motor, and the motor is fixedly connected to the lower surface of the recovery tank (1).

4. The isobutylene recovery device in the reaction process of tert-butyl acrylate according to claim 3, characterized in that: The excess liquid recovery device (8) comprises: a water absorption screen (81), the water absorption screen (81) being fixedly connected to the inner wall of the separation tank (2), the inner side of the water absorption screen (81) being provided with honeycomb-shaped through holes for absorbing residual water flowing into the recovery tank (1) along with the isobutylene from the flash tank, and the inner wall of the water absorption screen (81) being fixedly connected with a solid column (82); A slide rail (83), the slide rail (83) being fixedly connected to the inner wall of the recovery tank (1), the inner wall of the slide rail (83) being rotatably connected to an annular plate (84), the inner wall of the annular plate (84) being fixedly connected to a water storage bucket (85), the water storage bucket (85) being used to collect water dripping from the water absorption screen (81).

5. The isobutylene recovery device in the reaction process of tert-butyl acrylate according to claim 4, characterized in that: The excess liquid recovery device (8) further comprises: an air delivery pipe (86), the air delivery pipe (86) being fixedly connected to the inner wall of the bottom end of the water storage bucket (85), the air delivery pipe (86) being used to deliver gaseous isobutylene above the water storage bucket (85) to below the water storage bucket (85), the top end of the air delivery pipe (86) being fixedly connected to an air suction plate (87), the conical surface of the air suction plate (87) being provided with an air intake groove (88), when water droplets in the water suction screen (81) fall into the water storage bucket (85) and gather, the gaseous isobutylene is affected by the pressure and gathers near the air suction plate (87) and flows into the air suction plate (87) and the air delivery pipe (86) through the air intake groove (88), and finally flows to below the water storage bucket (85) through the air delivery pipe (86); A U-shaped connecting rod (89), wherein the U-shaped connecting rod (89) is fixedly connected to the top end of the main shaft (6).

6. The isobutylene recovery device in the reaction process of tert-butyl acrylate according to claim 5, characterized in that: The air suction plate (87) is rotatably connected to the lower surface of the water suction screen (81), and the top end of the U-shaped connecting rod (89) is fixedly connected to the bottom end of the water storage bucket (85).

7. The isobutylene recovery device in the reaction process of tert-butyl acrylate according to claim 6, characterized in that: The anti-polymerization device (9) comprises: A drug inlet pipe (91), the drug inlet pipe (91) being fixedly connected to the inner wall of the top end of the recovery tank (1), and the drug inlet pipe (91) being used to feed the polymerization inhibitor into the recovery tank (1); A connecting pipe (92) is fixedly connected to the outer conical surface of the water storage bucket (85), and a nozzle (93) is arranged below the connecting pipe (92).

8. The isobutylene recovery device in the reaction process of tert-butyl acrylate according to claim 7, characterized in that: The anti-polymerization device (9) further comprises: an annular medicine spraying trough (94), the annular medicine spraying trough (94) being fixedly connected to the bottom end of the connecting pipe (92), the annular medicine spraying trough (94) being used to increase the spraying range of the polymerization inhibitor; A limit clamping plate (95), wherein the limit clamping plate (95) is fixedly connected to the circumferential surface of the annular medicine spraying groove (94); A guide rail (96), wherein the guide rail (96) is fixedly connected to the inner wall of the recovery tank (1); An inner sleeve (97), the inner sleeve (97) is fixedly connected to the inner conical surface of the water storage bucket (85), the nozzle (93) is fixedly connected to the lower surface of the annular medicine spraying groove (94), the limit clamping plate (95) is rotatably connected to the inner wall of the guide rail (96), and the inner sleeve (97) is rotatably connected to the top surface of the inner wall of the recovery tank (1).

9. A method for recovering isobutylene in a tert-butyl acrylate reaction process, using the isobutylene recovery device in a tert-butyl acrylate reaction process according to claim 8, characterized in that: The following steps are involved: Step 1: First, the recovery tank (1) is evacuated by a vacuum pump and an exhaust pipe (4), so that negative pressure is generated in the recovery tank (1) and the isobutylene is sucked. The flashed isobutylene is attracted by suction and flows into the separation tank (2) through the feed pipe (3); Step 2: Then, the isobutylene in the separation tank (2) flows into the recovery tank (1), and at this time, the isobutylene in the recovery tank (1) is compressed into liquid by the compressor and the pressure pipe (5) and accumulated at the bottom of the recovery tank (1); Step 3: Subsequently, a polymerization inhibitor is added into the recovery tank (1) through the drug inlet pipe (91) and mixed with the isobutylene to prevent the isobutylene from polymerizing during the liquefaction process; Step 4: Finally, when the liquefied isobutylene needs to be subsequently processed, the discharge pipe (10) is opened, and the discharge pipe (10) is connected to a subsequent processing device to complete the discharge.

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