An apparatus for rectification separation and purification of diethyl carbonate

Abstract

The utility model relates to a device for rectification separation and purification of diethyl carbonate, which comprises a tower body, a tower top pipeline arranged at the top of the tower body, a discharge pipe arranged at the bottom of the tower body, a plurality of groups of circulating flow guide assemblies arranged in the tower body from top to bottom, a reflux pipe and a heating gas conveying assembly arranged on the tower body and located above and below the flow guide assemblies, respectively, and a feed pipe arranged on the tower body and located between the reflux pipe and the heating gas conveying assembly. The reflux design of the internal circulating pipeline can increase the residence time of the liquid raw material in the tower body, facilitating sufficient heating. The pipeline between the liquid inlet and the liquid outlet of the internal circulating pipeline is first contracted and then expanded. The contraction section can increase the flow rate of the liquid raw material. When the liquid raw material is delivered to the liquid outlet, the pressure of the liquid raw material increases, so that the liquid raw material can collide with the mesh plate and scatter in all directions when it is sprayed out, making the liquid raw material more uniform, thereby facilitating the rectification separation and purification of diethyl carbonate.

Description

Technical Field

[0001] This utility model belongs to the technical field of diethyl carbonate production equipment, specifically relating to a device for distillation separation and purification of diethyl carbonate. Background Technology

[0002] Dimethyl carbonate and ethanol are used as raw materials to produce methyl ethyl carbonate and diethyl carbonate. When dimethyl carbonate is in appropriate amount, methyl ethyl carbonate is mainly produced. When ethanol is in excess, ethanol will further react with methyl ethyl carbonate to produce diethyl carbonate. The traditional process is to use a fixed bed for transesterification reaction, and then use a distillation column for product separation and purification.

[0003] In the prior art, the equipment used for distillation separation and purification of diethyl carbonate generally has several baffles installed in the column. These baffles are used to increase the residence time of the liquid raw material in the column, so that the heating steam can fully heat it. However, the residence time is limited by the baffles alone, and they do not have the function of fully mixing the liquid raw material, which will affect or limit the effect of distillation separation and purification of diethyl carbonate. Utility Model Content

[0004] The purpose of this invention is to provide a device for distillation separation and purification of diethyl carbonate in order to solve the above-mentioned problems. It aims to address the issue that in the prior art, the distillation column only uses baffles to guide the flow, which limits the residence time of the liquid raw material and does not have the function of fully mixing the liquid raw material, thus limiting or restricting the effect of distillation separation and purification of diethyl carbonate.

[0005] This utility model achieves the above objectives through the following technical solutions: An apparatus for distillation separation and purification of diethyl carbonate includes a column body, a top pipe at the top of the column body, a discharge pipe at the bottom of the column body, several sets of circulating flow guiding components arranged sequentially from top to bottom inside the column body, a reflux pipe and a heating gas conveying component arranged on the column body and located above and below the flow guiding components, and a feed pipe arranged on the column body and located between the reflux pipe and the heating gas conveying component. The circulating flow guiding assembly includes a mesh plate fixed on the inner wall of the tower body, an internal circulation pipe on the mesh plate, a flow guiding plate horizontally or inclinedly installed on the inner wall of the tower body and located below the internal circulation pipe, and a trough opened on the flow guiding plate. The liquid raw materials guided by the circulating flow guiding components arranged sequentially from top to bottom follow a reversible conveying path.

[0006] As a further optimization of this utility model, the heating gas delivery assembly includes a reboiler connection port on the tower body, a coil assembly connected to the reboiler connection port, and a number of steam diffusion ports opened on the top of the coil assembly.

[0007] As a further optimization of this utility model, the coil assembly includes a central tube, several coils arranged around the coil assembly with progressively increasing diameters, and several branch tubes for connecting the central tube and the coils.

[0008] As a further optimization of this utility model, the liquid inlet of the internal circulation pipe is provided with a receiving flared part, and the receiving flared part is aligned and set below the trough of the previous circulation guide component or below the return pipe and below the feed pipe. The liquid outlet of the internal circulation pipe is bent upward and set above the internal circulation pipe.

[0009] As a further optimization of this utility model, the inlet of the internal circulation pipe is higher than the outlet.

[0010] As a further optimization of this utility model, the pipeline between the inlet and outlet of the internal circulation pipe is in a shape that first contracts and then expands.

[0011] As a further optimization of this utility model, the bottom of the tower body is provided with a base, and the base is provided with reinforcing ribs on the outside.

[0012] The beneficial effects of this utility model are as follows: This invention increases the time that liquid raw materials remain inside the tower through the reflux design of the internal circulation pipeline, allowing for sufficient heating and facilitating the distillation, separation, and purification of diethyl carbonate. This invention designs the internal circulation pipe between the inlet and outlet in a way that first contracts and then expands. The contraction section increases the flow rate of the liquid raw material. When the liquid raw material is delivered to the outlet, the pressure of the liquid raw material increases, allowing it to collide with the mesh plate and disperse when it is sprayed out. This promotes the mixing of the components in the liquid raw material and makes the liquid raw material more uniform, which is conducive to the distillation separation and purification of diethyl carbonate. This utility model has a simple structural design, is easy to operate and use, and is convenient for application and promotion. Attached Figure Description

[0013] Figure 1 This is a three-dimensional view of the overall structure of this utility model.

[0014] Figure 2 This is a cross-sectional view of the overall structure of this utility model.

[0015] Figure 3 This is the utility model Figure 2 A schematic diagram of part of the structure (the guide plate is tilted so that the trough is located on the low side of the liquid level).

[0016] Figure 4 This is the utility model Figure 2A schematic diagram of part of the structure (the guide plates are set in parallel or at an angle so that the trough is located on the side with the higher liquid level).

[0017] Figure 5 This is a top view of the coil assembly of this utility model.

[0018] Figure 6 This is a perspective view of the internal circulation pipe of this utility model.

[0019] In the diagram: 1. Base; 2. Tower body; 3. Reboiler connection port; 4. Feed pipe; 5. Tower top pipe; 6. Reflux pipe; 7. Discharge pipe; 8. Coil assembly; 9. Steam diffuser port; 10. Mesh plate; 11. Internal circulation pipe; 12. Feed flare; 13. Guide plate; 14. Slot. Detailed Implementation

[0020] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0021] like Figure 1-6 As shown, an apparatus for distillation separation and purification of diethyl carbonate includes a column body 2, a top pipe 5 located at the top of the column body 2, a discharge pipe 7 located at the bottom of the column body 2, several sets of circulating flow guiding components arranged sequentially from top to bottom inside the column body 2, a reflux pipe 6 located on the column body 2 and respectively located above and below the flow guiding components, a heating gas conveying component, and a feed pipe 4 located on the column body 2 and located between the reflux pipe 6 and the heating gas conveying component. The circulating flow guiding assembly includes a mesh plate 10 fixed on the inner wall of the tower body 2, an internal circulation pipe 11 on the mesh plate 10, a flow guiding plate 13 horizontally or inclinedly disposed on the inner wall of the tower body 2 and located below the internal circulation pipe 11, and a trough 14 opened on the flow guiding plate 13. The liquid raw materials guided by the circulating flow guiding components arranged sequentially from top to bottom follow a reversible conveying path.

[0022] like Figure 3-4 As shown, in this utility model, the guide plate 13 can be inclined or horizontally arranged on the inner wall of the tower body 2. When it is inclined, two methods are provided: one is that the guide plate 13 is inclined so that the trough 14 is located on the low liquid level side; the other is that the guide plate 13 is inclined so that the trough 14 is located on the high liquid level side. Preferably, the guide plate 13 is inclined so that the trough 14 is located on the high liquid level side, which can further increase the time that the liquid raw material stays inside the tower body 2, so as to facilitate sufficient heating.

[0023] Preferably, the heating gas delivery assembly includes a reboiler connection port 3 on the tower body 2, a coil assembly 8 connected to the reboiler connection port 3, and a plurality of steam diffuser ports 9 opened on the top of the coil assembly 8. Heating steam is delivered to the inside of the coil assembly 8 through the reboiler connection port 3, and then evenly diffused into the inside of the tower body 2 through the steam diffuser ports 9, so as to heat the mixed liquid raw material containing diethyl carbonate.

[0024] Preferably, the coil assembly 8 includes a central tube, several coils arranged around the coil assembly 8 with progressively increasing diameters, and several branch tubes for connecting the central tube and the coils.

[0025] Preferably, the liquid inlet of the internal circulation pipe 11 is provided with a receiving flared section 12, and the receiving flared section 12 is aligned and set below the trough 14 of the previous circulation guide component or below the return pipe 6 and the feed pipe 4. The liquid outlet of the internal circulation pipe 11 is bent upward and set above the internal circulation pipe 11. Compared with the traditional equipment with only the guide plate 13 and the trough 14, the return design of the internal circulation pipe 11 can increase the time that the liquid raw material stays in the tower body 2, so as to fully heat it.

[0026] Preferably, the inlet of the internal circulation pipe 11 is higher than the outlet, which facilitates the liquid to be transported into the internal circulation pipe 11 through the inlet and discharged through the outlet.

[0027] Preferably, the pipeline between the inlet and outlet of the internal circulation pipe 11 is designed to first contract and then expand. The liquid raw material being transported contains multiple components. This design can increase the flow rate of the liquid raw material through the contraction section. When the liquid raw material is transported to the outlet, the pressure of the liquid raw material increases, allowing the liquid raw material to collide with the mesh plate 10 and disperse in all directions when it is sprayed out, thereby promoting the mixing of the various components in the liquid raw material and making the liquid raw material more uniform.

[0028] Diethyl carbonate, produced by the reaction of dimethyl carbonate and excess ethanol, is preheated and fed into the tower body 2 via feed pipe 4. Top vapor is discharged through top pipe 5. After condensation, a portion of the liquid feedstock is returned to the tower via reflux pipe 6 as reflux liquid. The liquid feedstock fed into the tower body 2 via reflux pipe 6 and feed pipe 4 is collected by the receiving flared section 12, then transported out through internal circulation pipe 11 and sprayed onto the top of the mesh plate 10. After diffusion by the mesh plate 10, it falls onto the top of the guide plate 13, then flows downward through the trough 14, and is again collected by the receiving flared section 12 of the circulating guide assembly located below. Heating steam is fed into the tower body 2 through the reboiler connection port 3 to heat the feedstock, utilizing the difference in boiling points. To achieve the distillation separation of diethyl carbonate, the reflux design of the internal circulation pipe 11 increases the residence time of the liquid feedstock inside the column 2, facilitating thorough heating. Furthermore, the transported liquid feedstock contains multiple components. The pipe between the inlet and outlet of the internal circulation pipe 11 is designed to first contract and then expand. This design increases the flow rate of the liquid feedstock through the contraction section. When the liquid feedstock reaches the outlet, the pressure increases, causing it to collide with the mesh plate 10 and disperse upon ejection, thus promoting mixing among the components in the liquid feedstock. It also promotes thorough mixing of the reflux liquid transported in the reflux pipe 6 and the initial liquid feedstock added in the feed pipe 4, resulting in a more uniform liquid feedstock, which facilitates the distillation separation and purification of diethyl carbonate.

[0029] Preferably, the tower body 2 is provided with a base 1 at the bottom, and the base 1 is provided with reinforcing ribs on the outside to increase the support strength.

[0030] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. An apparatus for distillation separation and purification of diethyl carbonate, characterized in that: Includes a tower body (2), a tower top pipe (5) located at the top of the tower body (2), a discharge pipe (7) located at the bottom of the tower body (2), several sets of circulating flow guiding components arranged from top to bottom inside the tower body (2), a return pipe (6) located on the tower body (2) and located above and below the flow guiding components respectively, and a heating gas conveying component, and a feed pipe (4) located on the tower body (2) and located between the return pipe (6) and the heating gas conveying component; The circulating flow guide assembly includes a mesh plate (10) fixed on the inner wall of the tower body (2), an internal circulation pipe (11) on the mesh plate (10), a flow guide plate (13) horizontally or inclinedly installed on the inner wall of the tower body (2) and located below the internal circulation pipe (11), and a trough (14) opened on the flow guide plate (13). The liquid raw materials guided by the circulating flow guiding components arranged sequentially from top to bottom follow a reversible conveying path.

2. The apparatus for distillation separation and purification of diethyl carbonate according to claim 1, characterized in that: The heating gas delivery assembly includes a reboiler connection port (3) on the tower body (2), a coil assembly (8) connected to the reboiler connection port (3), and several steam diffusers (9) opened on the top of the coil assembly (8).

3. The apparatus for distillation separation and purification of diethyl carbonate according to claim 2, characterized in that: The coil assembly (8) includes a central tube, several coils arranged around the coil assembly (8) with increasing diameters, and several branch tubes for connecting the central tube and the coils.

4. The apparatus for distillation separation and purification of diethyl carbonate according to claim 1, characterized in that: The inlet of the internal circulation pipe (11) is provided with a receiving flared part (12), and the receiving flared part (12) is aligned with the trough (14) of the previous circulation guide component or the return pipe (6) and the feed pipe (4). The outlet of the internal circulation pipe (11) is bent upward and set above the internal circulation pipe (11).

5. The apparatus for distillation separation and purification of diethyl carbonate according to claim 4, characterized in that: The inlet of the internal circulation pipe (11) is higher than the outlet.

6. The apparatus for distillation separation and purification of diethyl carbonate according to claim 4, characterized in that: The internal circulation pipe (11) has a pipe that first contracts and then expands between the inlet and outlet.

7. The apparatus for distillation separation and purification of diethyl carbonate according to claim 1, characterized in that: The tower body (2) has a base (1) at its bottom, and the base (1) has reinforcing ribs on its outside.

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