Device for recovering DMC in triethylamine hydrochloride

Abstract

The utility model relates to a device for recovering DMC in triethylamine hydrochloride. The device comprises a first phase splitter, a first recovery system, a rectifying tower, a condenser, a second phase splitter and a second recovery system, an oil phase outlet of the first phase splitter is communicated with a material inlet of the first recovery system through a pipeline; a liquid phase outlet of the first phase splitter is communicated with a material inlet of the rectifying tower through a pipeline; a steam outlet in the rectifying tower is communicated with an inlet of the condenser through a pipeline, an outlet of the condenser is communicated with the second phase splitter through a pipeline, and a water outlet of the second phase splitter is communicated with a water inlet of the rectifying tower through a channel. And a DMC outlet of the second phase splitter is communicated with the second recovery system through a pipeline. The DMC recovery device has the beneficial effects that DMC is recovered through the device with a simple structure, continuous production can be realized, the production stability is high, and the equipment maintenance period is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of solvent recovery, in particular to a device for recovering DMC in triethylamine hydrochloride. Background Art

[0002] In the new energy lithium battery additive industry, as a film-forming additive with mature application and stable characteristics, vinylene carbonate can assist lithium batteries to achieve a large performance improvement, and is the electrolyte additive with the largest consumption. The distillation separation and purification technology in its production process plays a very important role in the finished product quality of vinylene carbonate.

[0003] Vinylene carbonate is produced by the reaction of chloroethylene carbonate and triethylamine in dimethyl carbonate (DMC) solvent, and triethylamine hydrochloride is produced as a by-product at the same time. After the synthesis reaction is completed, the material is centrifuged by a centrifuge, and the obtained solid material is triethylamine hydrochloride. Due to the reaction system, this triethylamine hydrochloride contains 15% of dimethyl carbonate (DMC), and this part of DMC needs to be recovered. The traditional recovery process is to use a rake dryer to dry and recover the triethylamine hydrochloride centrifuged by the centrifuge. The main principle is heating and drying, gas-phase condensation, and recovery. This process not only consumes a large amount of energy, but also the rake dryer needs to be cleaned frequently, the labor intensity of workers is large, and the on-site hygiene is difficult to guarantee. Content of the Utility Model

[0004] Aiming at the technical problems existing in the prior art, the utility model provides a device for recovering DMC in triethylamine hydrochloride. The principle is to adopt a rectification process to recover DMC in triethylamine hydrochloride. After directly dissolving triethylamine hydrochloride in water, part of DMC is recovered by phase separation, and then the aqueous phase is added to a rectification column for rectification to recover the remaining DMC. This not only reduces drying equipment, avoids a poor on-site environment, reduces the maintenance and repair of drying equipment, but also simplifies the process and reduces energy consumption.

[0005] The technical solution for the utility model to solve the above technical problems is as follows: A device for recovering DMC in triethylamine hydrochloride, comprising: a first phase separator, a first recovery system, a rectification column, a condenser, a second phase separator, and a second recovery system;

[0006] The oil phase outlet of the first phase separator is communicated with the feed inlet of the first recovery system through a pipeline;

[0007] The liquid phase outlet of the first phase separator is communicated with the feed inlet of the rectification column through a pipeline;

[0008] The vapor outlet on the rectifying column is connected to the inlet of the condenser through a pipeline. The outlet of the condenser is connected to the second phase separator through a pipeline. The water outlet of the second phase separator is connected to the water inlet of the rectifying column through a channel. The DMC outlet of the second phase separator is connected to the second recovery system through a pipeline.

[0009] As a further technical solution, both the first recovery system and the second recovery system include a first storage tank and a first extraction pump that are connected in sequence through pipelines.

[0010] Among them, the inlet of the first storage tank in the first recovery system is connected to the oil phase outlet of the first phase separator through a pipeline.

[0011] The inlet of the first storage tank in the second recovery system is connected to the DMC outlet of the second phase separator through a pipeline.

[0012] As a further technical solution, a second storage tank and a second extraction pump are also provided between the first phase separator and the rectifying column.

[0013] The inlet of the second storage tank is connected to the liquid phase outlet of the first phase separator through a pipeline.

[0014] The outlet of the second storage tank is connected to the inlet of the second extraction pump through a pipeline. The outlet of the second extraction pump is connected to the inlet of the rectifying column through a pipeline.

[0015] As a further technical solution, the rectifying column is connected with a circulation pump through a pipeline.

[0016] The beneficial effects of the present utility model are as follows: Recovering DMC through this device with a simple structure can achieve continuous production, and has high production stability and extends the equipment maintenance cycle.

[0017] Triethylamine in the solution can be recovered through dissolution - phase separation - rectification - phase separation by this device, reducing the investment in drying equipment. Description of the Drawings

[0018] Figure 1 It is a structural schematic diagram of a device for recovering DMC in triethylamine hydrochloride of the present utility model;

[0019] Figure 2 It is a structural schematic diagram of the first recovery system;

[0020] In the drawings, the list of components represented by each reference numeral is as follows:

[0021] First phase separator 1;

[0022] First recovery system 2, first storage tank 21, first extraction pump 22, drying system 23;

[0023] Rectifying column 3, condenser 4, second phase separator 5, second recovery system 6, second storage tank 7, second extraction pump 8, circulation pump 9. Specific embodiments

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0025] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0026] In the description of the present application, the term "for example" is used to mean "serving as an example, illustration, or description". Any embodiment described as "for example" in the present application is not necessarily construed as being more preferred or having more advantages than other embodiments. The following description is provided to enable any person skilled in the art to make and use the present invention. Details are set forth for the purpose of explanation in the following description. It should be understood that those skilled in the art can recognize that the present invention can be practiced without these specific details. In other instances, well-known structures and processes are not described in detail to avoid unnecessary details from obscuring the description of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed in the present application.

[0027] In order to effectively recover DMC in triethylamine hydrochloride and reduce energy consumption and the labor intensity of personnel, this embodiment provides a device for recovering DMC in triethylamine hydrochloride. Refer to Figure 1, including a first phase separator 1, a first recovery system 2, a rectification column 3, a condenser 4, a second phase separator 5, and a second recovery system 6; the oil phase outlet of the first phase separator 1 is communicated with the feed inlet of the first recovery system 2 through a pipeline to recover the upper-layer DMC in the first phase separator 1 to the first recovery system 2; the liquid phase outlet of the first phase separator 1 is communicated with the feed inlet of the rectification column 3 through a pipeline to send the lower-layer triethylamine salt solution in the first phase separator 1 into the rectification column 3 to continue recovering the DMC dissolved in water. The steam outlet on the rectification column 3 is communicated with the inlet of the condenser 4 through a pipeline, the outlet of the condenser 4 is communicated with the second phase separator 5 through a pipeline, and the water outlet of the second phase separator 5 is communicated with the water inlet of the rectification column 3 through a channel, that is, the azeotrope of DMC and water at the top of the rectification column 3 is condensed by the condenser 4, and the condensate enters the second phase separator 5. Then, the upper-layer water in the second phase separator 5 flows back to the rectification column 3, and the lower-layer DMC is recovered to the second recovery system 6; the DMC outlet of the second phase separator 5 is communicated with the second recovery system 6 through a pipeline.

[0028] In the specific implementation process, refer to Figure 2 , both the first recovery system 2 and the second recovery system 6 include a first storage tank 21 and a first extraction pump 22 that are sequentially communicated through pipelines; wherein, the feed inlet of the first storage tank 21 in the first recovery system 2 is communicated with the oil phase outlet of the first phase separator 1 through a pipeline, that is, DMC is collected by the first storage tank 21 and then extracted by the first extraction pump 22 to the drying system 23 for drying treatment and then recovered; the feed inlet of the first storage tank 21 in the second recovery system 6 is communicated with the DMC outlet of the second phase separator 5 through a pipeline, that is, the DMC obtained after rectification is extracted by the first extraction pump 22 to the drying system 23 for drying treatment and then recovered.

[0029] In the specific implementation process, a second storage tank 7 and a second extraction pump 8 are further provided between the first phase separator 1 and the rectification column 3; the feed inlet of the second storage tank 7 is communicated with the liquid phase outlet of the first phase separator 1 through a pipeline; the discharge outlet of the second storage tank 7 is communicated with the feed inlet of the second extraction pump 8 through a pipeline, and the discharge outlet of the second extraction pump 8 is communicated with the feed inlet of the rectification column 3 through a pipeline. That is, the lower-layer triethylamine salt solution in the first phase separator 1 is collected by the second storage tank 7 and then sent into the rectification column 3 by the second extraction pump 8 to continue recovering the DMC dissolved in water.

[0030] In the specific implementation process, the rectification column 3 is connected with a circulation pump 9 through a pipeline. That is, while the triethylamine salt solution continuously enters the rectification column 3, the circulation pump 9 circulates the solution in the rectification column 3. The circulating liquid passes through the reboiler in the rectification column 3, and the salt solution is heated by steam. The outlet of the circulation pump 9 extracts the salt solution to the next process, and the opening degree of the extraction regulating valve is automatically adjusted according to the liquid level of the rectification column 3.

[0031] Traditionally, a vacuum rake dryer is used, combined with jacket heating, high-vacuum exhaust, and gas condensation to recover DMC. The structure is complex, the cost is high, and due to its structural reasons, it needs to be operated intermittently, with a long drying time and low output. In addition, the dryer needs to be cleaned frequently, which increases the labor intensity and affects the on-site environment. Moreover, in order to ensure the vacuum degree, the vacuum device needs to be repaired frequently.

[0032] However, the design of the device in this embodiment enables the recovery of DMC from triethylamine hydrochloride. During the process, due to the simple structure of the device, and the ability to use rectification to recover DMC and achieve continuous production, the degree of automation is also high, and the production stability is strong. In addition, the cost of DMC recovery by this device is low, and the maintenance is simpler. During the DMC recovery process, atmospheric pressure operation is used, making the operation more convenient.

[0033] During the process of recovering DMC, triethylamine in the solution can also be recovered through dissolution - phase separation - rectification - phase separation, reducing the investment in drying equipment and simplifying the process flow.

[0034] In this embodiment, the structures and working principles not described in detail are all prior arts, such as the first phase separator, the second phase separator, the drying system, the rectification column, the condenser, etc. Therefore, they will not be elaborated here.

[0035] It should be noted that in the above embodiments, the descriptions of each embodiment have their own focuses. For the parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0036] Although the preferred embodiments of the present invention have been described, once those skilled in the art know the basic creative concept, additional changes and modifications can be made to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0037] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A device for recovering DMC from triethylamine hydrochloride, characterized in that, It comprises a first phase separator (1), a first recovery system (2), a distillation tower (3), a condenser (4), a second phase separator (5), and a second recovery system (6); The oil phase outlet of the first phase separator (1) is connected to the feed inlet of the first recovery system (2) through a pipeline; The liquid phase outlet of the first phase separator (1) is connected to the feed inlet of the distillation tower (3) through a pipeline; The steam outlet on the distillation tower (3) is connected to the inlet of the condenser (4) through a pipeline, the outlet of the condenser (4) is connected to the second phase separator (5) through a pipeline, the water outlet of the second phase separator (5) is connected to the water inlet of the distillation tower (3) through a channel, and the DMC outlet of the second phase separator (5) is connected to the second recovery system (6) through a pipeline.

2. A device for recovering DMC in triethylamine hydrochloride according to claim 1, characterized in that, The first recovery system (2) and the second recovery system (6) both comprise a first storage tank (21) and a first extraction pump (22) which are sequentially connected via a pipeline; The feed inlet of the first storage tank (21) in the first recovery system (2) is connected to the oil phase outlet of the first phase separator (1) through a pipeline; The feed inlet of the first storage tank (21) in the second recovery system (6) is connected to the DMC outlet of the second phase separator (5) through a pipeline.

3. A device for recovering DMC in triethylamine hydrochloride according to claim 1, characterized in that, A second storage tank (7) and a second extraction pump (8) are also provided between the first phase separator (1) and the distillation tower (3); The feed inlet of the second storage tank (7) is connected to the liquid phase outlet of the first phase separator (1) through a pipeline; The discharge port of the second storage tank (7) is connected to the feed port of the second extraction pump (8) through a pipeline, and the discharge port of the second extraction pump (8) is connected to the feed port of the distillation tower (3) through a pipeline.

4. A device for recovering DMC in triethylamine hydrochloride according to claim 1, characterized in that, The distillation tower (3) is connected to a circulation pump (9) via a pipeline.

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