Reaction system for preparing cyclic carbonate by urea method

Abstract

The utility model relates to the field of cyclic carbonate preparation devices, particularly discloses a reaction system for preparing cyclic carbonate by a urea method, and solves the technical problem of ammonia gas residues in materials in the process of synthesizing the cyclic carbonate by the urea method at present. The reaction kettle comprises a first feeding pipe, a first discharging pipe, a gas phase pipe, a jacket and a coil pipe which are arranged on the reaction kettle; the circulating unit is provided with a circulating pipeline communicated with the bottom and the top of the reaction kettle, and a top pipeline opening is provided with a nozzle; the flow guide unit is arranged at the top of the reaction kettle, the flow guide unit is composed of a flow guide plate and an overflow piece which are connected with each other, and the containing cavity of the reaction kettle is divided into a first containing cavity and a second containing cavity which are not communicated with each other; the buffer tank is provided with a third containing cavity, the third containing cavity is communicated with the second containing cavity, the buffer tank is provided with a second discharging pipe, residual ammonia gas in the buffer tank is reduced through circulating spraying of materials, and the reaction safety and the reaction product quality are improved.

Description

Technical Field

[0001] This utility model relates to the technical field of cyclic carbonate preparation apparatus, and more specifically, to a reaction system for preparing cyclic carbonates using the urea method. Background Technology

[0002] Urea, as an important chemical raw material, has a wide range of applications in many fields. The synthesis of cyclic carbonates using the urea method can not only effectively promote resource recycling and improve resource utilization efficiency, but also significantly reduce production costs, which is of great significance for promoting the development of green chemistry and environmental protection.

[0003] However, in existing urea-based processes for synthesizing cyclic carbonates, a large amount of ammonia gas is generated as a byproduct during the reaction. To ensure production continuity and safety, extraction measures are typically used to remove this ammonia gas. However, some ammonia gas tends to remain in the materials and is difficult to completely remove. This situation may not only affect the quality of the final product but also pose certain safety risks. Utility Model Content

[0004] The purpose of this invention is to provide a reaction system for preparing cyclic carbonates using the urea method, thereby solving the technical problem of residual ammonia in the materials during the current urea method for synthesizing cyclic carbonates.

[0005] This utility model provides a reaction system for preparing cyclic carbonates using the urea method, comprising: a reaction vessel, including a first feed pipe, a first discharge pipe, a gas phase pipe, a jacket, and a coil disposed thereon; a circulation unit, having a circulation pipe connecting the bottom and top of the reaction vessel, with a nozzle at the top pipe opening; a flow guiding unit, disposed at the top of the reaction vessel, the flow guiding unit consisting of a connected flow guiding plate and an overflow component, dividing the reaction vessel's accommodating cavity into two non-communicating accommod ...

[0006] According to one embodiment of the present invention, the circulation pipeline includes a first pipeline, a second pipeline and a third pipeline. The first pipeline is connected to the second pipeline via a pump, the second pipeline is connected to the third pipeline via a heat exchanger, and the third pipeline is provided with a nozzle at its end.

[0007] According to one embodiment of the present invention, the output end of the third pipe is set at an angle to the guide plate.

[0008] According to one embodiment of the present invention, both the guide plate and the overflow component are perforated plates.

[0009] According to one embodiment of the present invention, the guide plate is an arc-shaped plate.

[0010] According to one embodiment of the present invention, the second discharge pipe is provided with a flow meter for monitoring the flow rate inside the pipe.

[0011] According to one embodiment of the present invention, it further includes a stirring device at least partially disposed in the reaction vessel.

[0012] According to one embodiment of the present invention, a nitrogen gas venting pipe is provided at the bottom of the reaction vessel.

[0013] The technical solution of this utility model has at least the following advantages and beneficial effects:

[0014] (1) This utility model introduces a circulation unit, which extracts the material from the bottom of the reactor and sprays it back from the top of the reactor. During this process, ammonia is fully released and can be effectively removed by the extraction device, ensuring the high quality of the product and the overall safety of the system.

[0015] (2) The present invention is equipped with a flow guiding unit. When the material is sprayed onto the unit, the time for the material to flow back to the reaction system can be effectively shortened. At the same time, the residence time of the material in the upper space (i.e. the second containment chamber) is increased, thereby more effectively promoting the release of ammonia.

[0016] (3) The present invention has installed a nitrogen bubbling pipe at the bottom of the reactor. By continuously supplying nitrogen at the bottom of the reactor, a bubbling effect is formed, which helps to accelerate the escape of ammonia and further improves the ammonia removal efficiency.

[0017] (4) This utility model is also equipped with a buffer tank. When the material is sprayed from the third pipe to the second containment chamber and flows back to the reaction system of the first containment chamber through the guide unit, some of the material will overflow into the buffer tank. During this overflow process, the ammonia in the material can be further released, thereby achieving the effect of further purifying the material.

[0018] (5) By setting up a heat exchanger, this utility model ensures that the material is circulated and heated during the reflux process, thereby achieving an efficient and stable organic reaction process and ensuring the smooth progress of the reaction.

[0019] (6) This utility model adopts an advanced stirring device, which greatly improves the mixing effect of materials, not only speeds up the reaction rate, but also significantly improves the quality of the final product.

[0020] (7) The second discharge pipe of this utility model is equipped with a flow meter, which can monitor the discharge amount in real time, ensure the stability and controllability of the entire reaction process, and provide a reliable guarantee for production.

[0021] (8) The design of this utility model is scientific and reasonable, the structure is simple and clear, and it has high practical value. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the reaction system for preparing cyclic carbonates using the urea method provided in Embodiment 1 of this utility model;

[0024] Figure 2 This is a schematic diagram of the reaction system for preparing cyclic carbonates using the urea method provided in Embodiment 2 of this utility model;

[0025] Figure 3 This is a schematic diagram of the reaction system for preparing cyclic carbonates using the urea method provided in Embodiment 3 of this utility model;

[0026] icon:

[0027] 100. Reactor; 110. Gas phase pipe; 120. Jacket; 130. Coil; 140. Nitrogen venting pipe;

[0028] 210. First pipe; 220. Second pipe; 230. Third pipe; 240. Pump; 250. Heat exchanger;

[0029] 310. Deflector plate; 320. Overflow component;

[0030] 400. Stirring device;

[0031] 500. Buffer tank; 510. Flow meter. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Example 1

[0034] This invention provides a reaction system for preparing cyclic carbonates using the urea method, which reduces residual ammonia in the reactor, increases reaction safety, and improves the quality of the reaction products.

[0035] Please see Figure 1 as well as Figure 2 The reaction system for preparing cyclic carbonates using the urea method provided in this embodiment includes: a reaction vessel, comprising a first feed pipe, a first discharge pipe, a gas phase pipe 110, a jacket 120, and a coil 130 disposed thereon; valves respectively provided on the first feed pipe and the first discharge pipe; a circulation unit, comprising a circulation pipe connecting the bottom and top of the reaction vessel, with a nozzle at the top pipe opening for uniform spraying of materials; a flow guiding unit, disposed at the top of the reaction vessel, comprising a flow guiding plate 310 and an overflow component 320 connected thereto, dividing the reaction vessel's containment chamber into two non-communicating containment chambers, a first containment chamber and a second containment chamber, to optimize the material flow path, extend the residence time of the material in the second containment chamber, and promote the full release of ammonia; and a buffer tank, comprising a third containment chamber connected to the second containment chamber, for collecting part of the material overflowing from the second containment chamber, during which the material further releases ammonia to achieve a purification effect, with a second discharge pipe provided in the buffer tank;

[0036] In this embodiment, a gas phase pipe 110 is provided at the top of the reactor to extract ammonia gas located inside the reactor. In this embodiment, a valve is provided on the gas phase pipe 110.

[0037] In this embodiment, the circulation pipeline includes a first pipeline 210, a second pipeline 220, and a third pipeline 230. The first pipeline 210 is connected to the second pipeline 220 via a pump 240, and the second pipeline 220 is connected to the third pipeline 230 via a heat exchanger 250. This ensures that the material is circulated and heated during the reflux process, achieving an efficient and stable organic reaction process and guaranteeing the smooth progress of the reaction. A nozzle is provided at the end of the third pipeline 230. In this embodiment, valves are provided on the first pipeline 210, the second pipeline 220, and the third pipeline 230 respectively.

[0038] In this embodiment, the output end of the third pipe 230 is angled to the guide plate 310, and the nozzle at the end of the third pipe 230 is close to the guide plate 310 to ensure that the sprayed material acts on the guide unit and increase the material return time.

[0039] In this embodiment, both the guide plate 310 and the overflow component 320 are perforated plates. In this embodiment, the internal holes of the guide plate 310 and the overflow component 320 are interconnected to ensure that the material can flow from the second receiving cavity to the first receiving cavity. In this embodiment, the internal holes of the overflow component 320 are staggered.

[0040] In this embodiment, the guide plate 310 is an arc-shaped plate to increase the surface area of ​​the guide plate 310 and increase the residence time of the material on the guide plate 310.

[0041] In this embodiment, the second discharge pipe is equipped with a flow meter 510 for monitoring the flow rate inside the pipe, which can monitor the discharge amount in real time. In this embodiment, the second discharge pipe is equipped with a valve.

[0042] In this embodiment, a stirring device 400, which is at least partially located in the reaction vessel, is also included to enhance the mixing effect of materials and improve reaction efficiency and product quality.

[0043] In this embodiment, a nitrogen venting pipe 140 is provided at the bottom of the reactor. By continuously supplying nitrogen, a bubbling effect is formed, which accelerates the escape of ammonia and improves the ammonia removal efficiency. In this embodiment, a valve is provided on the nitrogen venting pipe 140.

[0044] The following is a detailed description of the use of the reaction system for preparing cyclic carbonates using the urea method in Embodiment 1 of this utility model:

[0045] In operation, the material is drawn from the bottom of the reactor by pump 240 and circulated for heating via heat exchanger 250. The heated material is then sprayed from the top of the reactor towards the guide unit via a third pipe 230. During spraying, the material flows back into the reaction system after passing through the guide unit. This process allows for the full release of ammonia. Simultaneously, a nitrogen venting pipe 140 at the bottom of the reactor continuously supplies nitrogen, and the resulting bubbling effect helps accelerate the escape of ammonia, further improving ammonia removal efficiency. The released ammonia is effectively removed by a vacuum device, ensuring system safety and high product quality.

[0046] Example 2

[0047] This invention provides a reaction system for preparing cyclic carbonates using the urea method, which reduces residual ammonia in the reactor, increases reaction safety, and improves the quality of the reaction products.

[0048] Please see Figure 2 The reaction system for preparing cyclic carbonates by urea method provided in Embodiment 2 of this utility model differs from that in Embodiment 1 only in that, in this embodiment, the guide plate 310 is a straight plate arranged in the vertical direction, and the output end of the third pipe 230 is arranged perpendicular to the guide plate 310.

[0049] Example 3

[0050] This invention provides a reaction system for preparing cyclic carbonates using the urea method, which reduces residual ammonia in the reactor, increases reaction safety, and improves the quality of the reaction products.

[0051] Please see Figure 3The reaction system for preparing cyclic carbonates using the urea method provided in Embodiment 3 of this utility model differs from Embodiment 1 or Embodiment 2 only in that, in this embodiment, the second discharge pipe is connected to the second pipeline 220 via the pump 240, so that the material in the buffer tank 500 is further heated and sprayed by the heat exchanger 250 and then returned to the reaction system, so as to further ensure the overflow of ammonia.

[0052] The embodiments of this utility model have at least the following advantages:

[0053] (1) This utility model introduces a circulation unit, which extracts the material from the bottom of the reactor and sprays it back from the top of the reactor. During this process, ammonia is fully released and can be effectively removed by the extraction device, ensuring the high quality of the product and the overall safety of the system.

[0054] (2) The present invention is equipped with a flow guiding unit. When the material is sprayed onto the unit, the time for the material to flow back to the reaction system can be effectively shortened. At the same time, the residence time of the material in the upper space (i.e. the second containment chamber) is increased, thereby more effectively promoting the release of ammonia.

[0055] (3) The present invention has installed a nitrogen bubbling pipe at the bottom of the reactor. By continuously supplying nitrogen at the bottom of the reactor, a bubbling effect is formed, which helps to accelerate the escape of ammonia and further improves the ammonia removal efficiency.

[0056] (4) This utility model is also equipped with a buffer tank. When the material is sprayed from the third pipe to the second containment chamber and flows back to the reaction system of the first containment chamber through the guide unit, some of the material will overflow into the buffer tank. During this overflow process, the ammonia in the material can be further released, thereby achieving the effect of further purifying the material.

[0057] (5) By setting up a heat exchanger, this utility model ensures that the material is circulated and heated during the reflux process, thereby achieving an efficient and stable organic reaction process and ensuring the smooth progress of the reaction.

[0058] (6) This utility model adopts an advanced stirring device, which greatly improves the mixing effect of materials, not only speeds up the reaction rate, but also significantly improves the quality of the final product.

[0059] (7) The second discharge pipe of this utility model is equipped with a flow meter, which can monitor the discharge amount in real time, ensure the stability and controllability of the entire reaction process, and provide a reliable guarantee for production.

[0060] (8) The design of this utility model is scientific and reasonable, the structure is simple and clear, and it has high practical value.

[0061] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A reaction system for preparing cyclic carbonates using the urea process, characterized in that, include: The reactor includes a first feed pipe, a first discharge pipe, a gas phase pipe, a jacket, and a coil disposed thereon; The circulation unit is provided with a circulation pipe connecting the bottom and the top of the reactor, and a nozzle is provided at the top pipe opening; A flow guiding unit is located at the top of the reactor. The flow guiding unit consists of a flow guiding plate and an overflow component connected together, which divides the reactor's containment cavity into two non-communicating containment cavities: a first containment cavity and a second containment cavity. The buffer tank is provided with a third receiving cavity, which is connected to the second receiving cavity, and the buffer tank is provided with a second discharge pipe.

2. The reaction system for preparing cyclic carbonates using the urea method according to claim 1, characterized in that, The circulation pipeline includes a first pipeline, a second pipeline, and a third pipeline. The first pipeline is connected to the second pipeline via a pump, the second pipeline is connected to the third pipeline via a heat exchanger, and the third pipeline is provided with a nozzle at its end.

3. The reaction system for preparing cyclic carbonates using the urea method according to claim 2, characterized in that, The output end of the third pipe is set at an angle to the guide plate.

4. The reaction system for preparing cyclic carbonates using the urea method according to any one of claims 1 to 3, characterized in that, Both the guide plate and the overflow component are perforated plates.

5. The reaction system for preparing cyclic carbonates using the urea method according to any one of claims 1 to 3, characterized in that, The guide plate is an arc-shaped plate.

6. The reaction system for preparing cyclic carbonates using the urea method according to any one of claims 1 to 3, characterized in that, The second discharge pipe is equipped with a flow meter for monitoring the flow rate inside the pipe.

7. The reaction system for preparing cyclic carbonates using the urea method according to any one of claims 1 to 3, characterized in that, It also includes a stirring device that is at least partially located in the reactor.

8. The reaction system for preparing cyclic carbonates using the urea method according to any one of claims 1 to 3, characterized in that, The bottom of the reactor is equipped with a nitrogen gas venting pipe.

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