A device for producing cyclic carbonate by urea method

Abstract

The utility model discloses a device of urea method production cyclic carbonate, contain feed inlet (1), discharge gate (2), vacuum air extraction (3), jacket (4), shell (5). The device of urea method production cyclic carbonate of the utility model can realize continuous production, reduce the occupation, improve the output.

Description

Technical Field

[0001] This utility model belongs to the field of fine chemicals and relates to an apparatus for producing cyclic carbonate esters by the urea process. Background Technology

[0002] Cyclic carbonate esters possess high ionic conductivity and high dielectric constant, which can improve battery performance and stability, making them a key component of lithium-ion battery electrolytes. Furthermore, cyclic carbonate esters exhibit high purity, low toxicity, and excellent chemical stability, meeting environmental protection requirements. They have found widespread application in areas where they can replace traditional solvents, such as the textile industry and industrial solvents, further expanding their market demand.

[0003] Currently, the main industrial methods for producing cyclic carbonates include the phosgene process, the epoxy compound pressurization process, and the urea alcoholysis process. The epoxy compound pressurization process is primarily used in the domestic and international chemical industries; however, this method requires high-temperature and high-pressure reactions, which can easily lead to dangerous accidents such as explosions. The phosgene process is gradually being phased out due to its high toxicity and severe pollution. The urea alcoholysis process, on the other hand, has milder reaction conditions than the epoxy compound pressurization process and can address the issue of overcapacity in urea production, making its industrial application prospects very promising.

[0004] However, the current production of cyclic carbonates by urea alcoholysis mainly uses batch production in reactors, which is cumbersome, has a long production cycle, and is small in scale. Moreover, most of these are still in the pilot-scale test stage. According to the experiments conducted by our company, the reaction has a significant scale-up effect, and the reactor is not conducive to large-scale production in the future. Summary of the Invention

[0005] The purpose of this invention is to provide an apparatus for the continuous production of cyclic carbonate esters using the urea process. This apparatus enables high production efficiency and large-scale output of cyclic carbonate esters using the urea process.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an apparatus for producing cyclic carbonate esters using the urea method, characterized in that it comprises an inlet (1), an outlet (2), a vacuum extraction port (3), a jacket (4), a spiral channel (5), a central tube (6), and an apparatus shell (7); wherein, the inlet (1) is located at the top of the apparatus and connected to the spiral channel (5), the outlet (2) is located at the bottom of the apparatus and connected to the spiral channel (5), the spiral channel (5) is supported by the central tube (6) as a coiling reference, the spiral channel (5) is surrounded by a jacket (4), each coil of the spiral channel (5) is provided with a vacuum extraction port (3), and the apparatus shell (7) is provided outside the apparatus. The spiral channel (5) is coiled and supported by the central tube (6) as a coiling reference, descending in a spiral shape with the same pitch, and is symmetrically distributed around the center of the equipment. The vacuum extraction port (3) is located at the top of each coil of the spiral channel (5).

[0007] The reaction raw materials for this scheme are urea and ethylene glycol or urea and propylene glycol. The mixed reaction solution enters the reactor through the feed port (1), reacts along the spiral channel (5), and is finally discharged from the outlet for further product separation. The heat source (hot water, heat transfer oil, or steam) enters the reactor through the jacket (4) to provide heat for the reaction. The system vacuum is established through the vacuum evacuation port (3), and an external vacuum pump is connected to maintain the required vacuum level of the system. The spiral channel increases the contact area of ​​the reaction solution, which enhances both heat exchange and gas removal, and reduces the scale-up effect.

[0008] This utility model has the following advantages: (1) To achieve continuous production of cyclic carbonate esters using the urea process; (2) Reduces the scale-up effect. It is more conducive to large-scale production. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0010] Figure 1 This is a schematic diagram of the device of this utility model.

[0011] Figure 2 This is a top view of the device of this utility model.

[0012] Figure 3 This is a cross-sectional view of the spiral channel of the device of this utility model.

[0013] Explanation of reference numerals in the attached figures: 1. Feed inlet; 2. Discharge outlet; 3. Vacuum extraction port; 4. Jacket; 5. Spiral channel; 6. Central tube; 7. Device casing. Detailed Implementation

[0014] The present invention will be further described below with reference to examples. The following embodiments are intended to illustrate the present invention and not to limit it. An apparatus for producing cyclic carbonate esters by urea process is characterized in that it includes an inlet (1), an outlet (2), a vacuum extraction port (3), a jacket (4), a spiral channel (5), a central tube (6), and an apparatus shell (7); wherein the inlet (1) is at the top of the apparatus and connected to the spiral channel (5), the outlet (2) is at the bottom of the apparatus and connected to the spiral channel (5), the spiral channel (5) is supported by the central tube (6) as a coiling reference, the spiral channel (5) is surrounded by a jacket (4), each spiral channel (5) is provided with a vacuum extraction port (3), and the apparatus is surrounded by an apparatus shell (7). The spiral channel (5) is coiled and supported by the central tube (6) as a coiling reference, descending in a spiral shape with the same pitch, and is symmetrically distributed around the center of the equipment. The vacuum extraction port (3) is located at the top of each spiral channel (5).

[0015] The reaction raw materials are urea and ethylene glycol or urea and propylene glycol. The mixed reaction solution enters the reactor through the feed port (1), reacts along the spiral channel (5), and is finally discharged from the outlet for further product separation. The heat source (hot water, heat transfer oil, or steam) enters the reactor through the jacket (4) to provide heat for the reaction. The system vacuum is established through the vacuum evacuation port (3) and an external vacuum pump is connected to maintain the required vacuum level of the system.

[0016] Implementation Case 1: Ethylene glycol and urea are used as raw materials. After being mixed with the catalyst, the mixture is fed into the reactor through the feed port (1) and reacted along the spiral channel (5). Finally, the mixture is discharged from the outlet for further product separation. A heat source (hot water, heat transfer oil, or steam) enters the reactor through the jacket (4) to provide heat for the reaction, and the reaction temperature is controlled at 150°C. The system vacuum is established through the vacuum extraction port (3), and an external vacuum pump is connected to maintain the required vacuum level of the system at -0.098 kPa. After 24 hours of continuous production, 150 tons of ethylene carbonate are obtained.

[0017] Implementation Case 2: Propylene glycol and urea are used as raw materials. After being mixed with the catalyst, the mixture is introduced into the reactor through the feed port (1) and reacted along the spiral channel (5). Finally, the mixture is discharged from the outlet for further product separation. The heat source (hot water, heat transfer oil, or steam) enters the reactor through the jacket (4) to provide heat for the reaction, and the reaction temperature is controlled at 145℃. The system vacuum is established through the vacuum evacuation port (3), and an external vacuum pump is connected to maintain the required vacuum level of the system at -0.098 kPa. After 24 hours of continuous production, 165 tons of propylene carbonate are obtained.

[0018] The above embodiments are merely examples of these two cyclic carbonate esters; other cyclic esters are also within the scope of protection. This invention provides one implementation of an apparatus for refining electronic-grade cyclic carbonate esters. Any modifications to the solution provided by this invention, including adding or subtracting components or steps, or applying this invention to similar technical fields, all fall within the scope of protection of this invention.

Claims

1. An apparatus for producing cyclic carbonate esters using the urea process, comprising an inlet (1), an outlet (2), a vacuum extraction port (3), a jacket (4), a spiral channel (5), a central tube (6), and an apparatus shell (7); wherein, The feed inlet (1) is at the top of the device and connected to the spiral channel (5). The discharge outlet (2) is at the bottom of the device and connected to the spiral channel (5). The spiral channel (5) is supported by the central tube (6) as the coiling reference. There is a jacket (4) outside the spiral channel (5). A vacuum extraction port (3) is provided on each spiral channel (5). The device is equipped with a device shell (7).

2. The apparatus for producing cyclic carbonates using the urea process according to claim 1, characterized in that: The spiral channel (5) is spiraled down with the central tube (6) as the reference and support, and is symmetrically distributed around the center of the equipment.

3. The apparatus for producing cyclic carbonates using the urea process according to claim 1, characterized in that: The vacuum extraction port (3) is located at the top of each spiral channel (5).

4. The apparatus for producing cyclic carbonates using the urea process according to claim 1, characterized in that: The jacket (4) is connected to a heat source, preferably hot water, heat transfer oil or steam.

5. The apparatus for producing cyclic carbonates using the urea process according to claim 1, characterized in that: The reaction raw materials are urea and ethylene glycol or urea and propylene glycol.

Images