A reaction vessel to prevent ammonia leakage

Abstract

This utility model relates to the field of 2-thiazolidinone technology, and in particular to a reaction vessel for preventing ammonia leakage. It comprises a dissolving vessel and a synthesis vessel, connected by a connecting pipe. A sealing door and a feeder are respectively connected to the feeding ports of the dissolving vessel and the synthesis vessel. The feeder contains a feeding assembly, and a hopper is fixedly connected to the feeding end of the feeder. The hopper contains a screening assembly. The connecting pipe, along with the sealing door and the feeder, prevents the need to reopen the feeding port before all raw materials are consumed. The feeder delivers urea through the feeding assembly, and the urea entering the hopper is filtered by the screening assembly to remove clumps of urea. Furthermore, the filtered urea can be crushed by a tamping component during the next feeding, avoiding the need to repeatedly crush clumps of urea, which would affect processing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of 2-thiazolidinone production technology, and in particular to a reaction vessel for preventing ammonia leakage. Background Technology

[0002] 2-Thiazolidinone is an important organic synthesis intermediate, widely used in pharmaceuticals, pesticides, rubber additives and other fields. In the production of 2-thiazolidinone, cysteine ​​hydrochloride and urea are reacted by heating to 170°C to produce 2-thiazolidinone and ammonium chloride. After the material is placed in the extraction vessel for extraction, the manhole of the synthesis vessel is opened and cysteine ​​hydrochloride and urea are added into the synthesis vessel to continue the reaction by heating. During this process, the ammonia gas remaining in the vessel will overflow from the vessel after the manhole is opened.

[0003] The production of 2-thiazolidinone generates harmful gases. For example, Chinese Patent Publication No. CN110563666B discloses a method for preparing 2-thiazolidinone, belonging to the field of pesticide chemical products technology. This method uses cysteine ​​hydrochloride and urea as raw materials and synthesizes 2-thiazolidinone using a hot-melt method. First, cysteine ​​hydrochloride and urea are hot-melted in a reaction vessel and then undergo a cyclization reaction to obtain a mixture of products synthesized by the hot-melt method. Then, toluene is added to the reaction vessel for hot extraction. The toluene extract is filtered into a solvent removal vessel and removed by vacuum distillation. The bottom liquid of the solvent removal vessel is then transferred to a crystallization vessel for cooling and crystallization. 2-Thiazolidinone seed crystals are added to the crystallization vessel to obtain a white needle-like microcrystalline product. The white needle-like microcrystalline product is then air-dried in a ventilated environment to obtain 2-thiazolidinone. This invention's method is simple and easy to control, has low production costs, and generates no significant micro-waste or harmful byproducts, exhibiting significant environmental friendliness.

[0004] In practice, although harmful gases are treated, residual harmful gases inside the reactor can still leak out when the manhole is opened to feed materials. It is impossible to seal the harmful gases inside the reactor to prevent leakage during the feeding process, which can easily lead to personnel poisoning and pollution of the processing environment. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies that cannot seal and prevent the leakage of harmful gases inside the reactor during the feeding process, and to propose a reaction vessel that prevents ammonia leakage.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] Design a reaction vessel to prevent ammonia leakage, which consists of a dissolving vessel and a synthesis vessel. The dissolving vessel and the synthesis vessel are connected by a connecting pipe. A sealing door and a feeder are respectively connected to the feeding port of the dissolving vessel and the synthesis vessel.

[0008] The feeder is equipped with a feeding component and a hopper is fixedly connected to the feed end of the feeder. The hopper is equipped with a screening component, which is used to screen and crush agglomerated materials.

[0009] Furthermore, the feeding assembly includes a motor, the top and interior of the feeder are fixedly connected to the motor, and a feeding component is rotatably connected via a shaft seal, the end of the feeding component being fixedly connected to the shaft end of the motor.

[0010] The feeding component consists of a shaft and several feeding plates fixedly connected to the periphery of the shaft.

[0011] Furthermore, the screening assembly includes a base, a detachable sealing cover at the top feed inlet of the hopper, and the base fixedly connected to the hopper inside.

[0012] A filter screen is fixedly connected to the bottom of the base, and a tamping element is slidably connected to the support frame at the top via a baffle and a first spring.

[0013] Furthermore, the side of the tamping piece has a material feeding groove, and a side plate is rotatably connected to it within the material feeding groove. The side plate is movably connected to a pin shaft in the sliding groove on both sides by a second spring and a guide. The free ends of the two pin shafts are rotatably connected to the protrusions on both sides of the tamping piece.

[0014] Furthermore, one of the pins has a protrusion on its free end periphery, and the tamping member has a cross-shaped positioning groove in the shaft hole of the side protrusion, and the protrusion is movably inserted into the positioning groove.

[0015] Furthermore, a vibration motor is fixedly connected to the outer wall of the hopper.

[0016] The present invention proposes a reaction vessel for preventing ammonia leakage. The advantages are as follows: A connecting pipe is installed between the dissolving vessel and the synthesis vessel. This connecting pipe, along with a sealing door and a feeder, prevents the need to open the feeding port twice before all raw materials are consumed, effectively preventing leakage of residual ammonia. The feeder delivers urea via a feeding assembly, and the urea fed into the hopper is filtered by a screening assembly to remove agglomerated urea. Furthermore, the filtered urea can be crushed by a tamping component during the next feeding, avoiding the need to repeatedly crush agglomerated urea, which would affect processing efficiency. The structure is simple and highly practical. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the feeder and hopper of this utility model;

[0019] Figure 3 This is a cross-sectional view of the feeding assembly of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the screening component of this utility model;

[0021] Figure 5 for Figure 4 A magnified structural diagram of area A.

[0022] In the diagram: 1. Dissolving vessel; 2. Synthetic vessel; 3. Connecting pipe fittings; 4. Sealing door; 5. Feeder; 6. Feeding assembly; 61. Motor; 62. Shaft seal; 63. Shaft; 64. Feeding plate; 7. Hopper; 71. Sealing cover; 8. Screening assembly; 81. Base; 82. Filter screen; 83. Support frame; 84. Baffle plate; 85. First spring; 86. Tamping component; 861. Positioning groove; 87. Side plate; 871. Guide part; 88. Second spring; 89. Pin; 891. Protrusion; 9. Vibrating motor. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Reference Figure 1-5 A reaction vessel for preventing ammonia leakage is composed of a dissolving vessel 1 and a synthesis vessel 2. The dissolving vessel 1 and the synthesis vessel 2 are connected by a connecting pipe 3. A sealing door 4 and a feeder 5 are respectively connected to the feeding holes of the dissolving vessel 1 and the synthesis vessel 2.

[0025] The feeder 5 is equipped with a feeding component 6 inside, and a hopper 7 is fixedly connected to the feeding end of the feeder 5. The hopper 7 is equipped with a screening component 8 inside, which is used to screen and crush agglomerated materials.

[0026] In some embodiments, cysteine ​​hydrochloride is added into a dissolving vessel 1 and heated to 110°C. Then, steam enters the dissolving vessel 1 to melt the cysteine ​​hydrochloride into a liquid. The cysteine ​​hydrochloride liquid flows into the synthesis vessel 2 by gravity and through the connecting pipe 3.

[0027] The synthesis reactor 2 is fixedly connected to the feeder 5 and the hopper 7 through the connection hole. The hopper 7 is used to store urea and works with the feeder 5 to feed urea in batches. Specifically, in this process, cysteine ​​hydrochloride and urea are fed and sealed in the reactor to react, which can avoid the leakage of ammonia gas in the reactor caused by opening and closing the feed port twice.

[0028] More specifically, it should be added that both the outer walls of the dissolving vessel 1 and the synthesis vessel 2 are connected to vent valves, which can reduce the pressure inside the synthesis vessel 2. In this way, the steam transported in the dissolving vessel 1 can allow the molten cysteine ​​hydrochloride to enter the synthesis vessel 2 through the connecting pipe 3.

[0029] It is worth mentioning that the synthesis reactor 2 is also connected to an air extraction device to clean the ammonia gas. The motor 61 drives the feeding component to control the urea feed rate and controls the internal pressure of the synthesis reactor 2 through the venting valve, thus keeping the feed rates of urea and cysteine ​​hydrochloride within a reasonable range.

[0030] Furthermore, the feeding assembly 6 includes a motor 61, the top and interior of the feeder 5 are fixedly connected to the motor 61, and a feeding component is rotatably connected through a shaft seal 62, the end of the feeding component being fixedly connected to the shaft end of the motor 61.

[0031] The feeding component consists of a shaft 63 and several feeding plates 64 fixedly connected to the periphery of the shaft 63.

[0032] In some embodiments, the shaft seal 62 is a prior art mechanical element used for sealing between the rotating shaft and the equipment housing, mainly used to prevent ammonia gas from leaking out of the reactor.

[0033] In this embodiment, the feeding component is driven to rotate by the motor 61. The rotating feeding component feeds urea through the feeding chamber between two adjacent feeding plates 64. Specifically, the feeding plate 64 is fitted with the internal cavity of the feeder 5 with a clearance.

[0034] Furthermore, the screening assembly 8 includes a base 81, a sealing cover 71 detachably connected to the top feed inlet of the hopper 7, and the base 81 fixedly connected inside the hopper 7.

[0035] The base 81 is fixedly connected to a filter screen 82 at its bottom, and a tamping element 86 is slidably connected to a support frame 83 at the top via a baffle 84 and a first spring 85.

[0036] In this embodiment, the tamping member 86 is composed of a rod-shaped portion and an outwardly protruding portion, and its overall cross-section has a T-shaped structure, such as... Figure 4As shown, the tamping member 86 is fixedly connected to the bottom of the rod-shaped part with a baffle 84 and a first spring 85, and the two ends of the first spring 85 respectively abut against the baffle 84 and the protruding part of the tamping member 86.

[0037] Specifically, the first spring 85 provides elastic support to prevent the tamping piece 86 from falling and affecting the urea feeding. On the other hand, it can be manually operated in conjunction with the first spring 85 to drive the tamping piece 86 to move up and down repeatedly, and in conjunction with the vibration motor 9 to screen and feed the crushed clumps of urea.

[0038] More specifically, the tamping member 86 has a material feeding groove on its side, and a side plate 87 is rotatably connected to it within the material feeding groove. The side plate 87 is located in the sliding grooves on both sides and is movably connected to a pin 89 via a second spring 88 and a guide part 871. The free ends of the two pins 89 are rotatably connected to the protrusions on both sides of the tamping member 86.

[0039] like Figure 5 As shown, the guide part 871 includes a guide key and a guide groove. A guide key is provided on the periphery of one end of each of the two pins 89. The side plate 87 is provided with a guide groove on the inner wall of the side slide groove. The guide key is slidably connected to the guide groove and is used to circumferentially lock the pins 89.

[0040] In general, one of the pins 89 has a protrusion 891 on the periphery of its free end, and the tamping member 86 has a positioning groove 861 in a cross structure in the shaft hole of the side protrusion, and the protrusion 891 is movably inserted into the positioning groove 861.

[0041] In this embodiment, the sealing cover 71 can be closed and sealed on the top feeding port of the hopper 7 by a snap or locking bolt. The filter screen 82 works with the vibration motor 9 to screen and feed the urea, and the filter screen 82 works with the base 81 to collect the clumped urea.

[0042] Specifically, under normal circumstances, the protrusion 891, in conjunction with the positioning groove 861, drives the side plate 87 to flip. At this time, urea can be fed through the clearance groove. Furthermore, because the base 81 is compatible with the internal diameter of the hopper 7, it prevents urea from being fed directly without passing through the filter screen 82.

[0043] More specifically, pressing the pin 89 to retract it can drive the protrusion 891 to disengage from the positioning groove 861. At this time, the side plate 87 can be rotated in conjunction with the pin 89 half shaft on the other side. After the protrusion 891 is movably inserted into the positioning groove 861 on the other side, the side plate 87 is flattened and forms a complete circular structure with the bottom half of the tamping piece 86, which can then drive the tamping piece 86 to crush the clump of urea.

[0044] Among them, such as Figure 5As shown, the two ends of the second spring 88 are fixedly connected to the inner wall of the groove and the end of the pin 89, respectively.

[0045] Both pins 89 can be separated from the protrusions on the side of the tamping piece 86 by retracting under force, so as to facilitate the disassembly and replacement of the side plate 87. Of course, in order to further improve the stability of the side plate 87 when rotating, the pins 89 without the protrusions 891 can be directly threaded to the side plate 87 by locking bolts.

[0046] Finally, a vibration motor 9 is fixedly connected to the outer wall of the hopper 7.

[0047] Working method: Cysteine ​​hydrochloride and urea are introduced into the dissolving kettle 1 and hopper 7 respectively through the sealing door 4 and sealing cover 71. After heating, cysteine ​​hydrochloride becomes liquid and enters the synthesis kettle 2 through the connecting pipe 3. At this time, the motor 61 drives the feeding plate 63 to rotate through the shaft 63 to feed urea. Then, the cysteine ​​hydrochloride in the synthesis kettle 2 reacts with urea. During this process, excess ammonia gas is discharged through the exhaust device.

[0048] Among them, the urea entering the hopper 7 will first pass through the base 81 and the filter screen 82, and the clumped urea will be screened under the action of the filter screen 82 and the vibrating motor 9.

[0049] When the next batch of urea is fed, press the pin 89 to make it retract, which will drive the protrusion 891 to disengage from the positioning groove 861. At this time, the side plate 87 can be rotated in conjunction with the pin 89 half shaft on the other side. After the protrusion 891 is movably inserted into the positioning groove 861 on the other side, the side plate 87 is flattened and forms a complete circular structure with the bottom half of the tamping piece 86, which can then drive the tamping piece 86 to crush the clump of urea.

[0050] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A reaction vessel for preventing ammonia leakage, comprising a dissolving vessel (1) and a synthesis vessel (2), characterized in that: The dissolving vessel (1) and the synthesis vessel (2) are connected by a connecting pipe (3). A sealing door (4) and a feeder (5) are respectively connected to the feeding holes of the dissolving vessel (1) and the synthesis vessel (2). The feeder (5) is equipped with a feeding component (6) and a hopper (7) is fixedly connected to the feeding end of the feeder (5). The hopper (7) is equipped with a screening component (8) which is used to screen and crush agglomerated materials.

2. The reaction vessel for preventing ammonia leakage according to claim 1, characterized in that: The feeding assembly (6) includes a motor (61), the top and inside of the feeder (5) are fixedly connected to the motor (61), and a feeding component is rotatably connected through a shaft seal (62), the end of the feeding component is fixedly connected to the shaft end of the motor (61). The feeding component consists of a shaft (63) and several feeding plates (64) fixedly connected to the periphery of the shaft (63).

3. The reaction vessel for preventing ammonia leakage according to claim 1, characterized in that: The screening assembly (8) includes a base (81), the hopper (7) is detachably connected to a sealing cover (71) at the top feed inlet, and the base (81) is fixedly connected inside the hopper. The base (81) has a filter screen (82) fixedly connected to its bottom, and a tamping element (86) is slidably connected to the support frame (83) at the top via a baffle (84) and a first spring (85).

4. The reaction vessel for preventing ammonia leakage according to claim 3, characterized in that: The tamping piece (86) has a material feeding groove on its side, and a side plate (87) is rotatably connected to it in the material feeding groove. The side plate (87) is located in the sliding groove on both sides and is movably connected to a pin (89) through a second spring (88) and a guide (871). The free ends of the two pins (89) are rotatably connected to the protrusions on both sides of the tamping piece (86).

5. A reaction vessel for preventing ammonia leakage according to claim 4, characterized in that: One of the pins (89) has a protrusion (891) on the periphery of its free end. The tamping piece (86) has a positioning groove (861) in a cross structure in the shaft hole of the side protrusion. The protrusion (891) is movably inserted into the positioning groove (861).

6. The reaction vessel for preventing ammonia leakage according to claim 1, characterized in that: A vibrating motor (9) is fixedly connected to the outer wall of the hopper (7).

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