Mixed diacid dimethyl ester distillation system

Abstract

This utility model discloses a dimethyl diacid distillation system, including a circular reboiler with two circular connecting ports at the top. Distillation columns are mounted above each connecting port, arranged side-by-side. An electric butterfly valve is installed between the bottom of each distillation column and the connecting port, controlling the connection between the reboiler and the distillation columns. A stirring shaft is inserted at the center of the top of the reboiler. A heat exchange jacket is installed outside the reboiler, forming a sealed cavity with the jacket. Spiral guide vanes are installed within this sealed cavity. This dimethyl diacid distillation system utilizes two distillation channels, one for operation and one for backup, achieving a balance between safety and economy while ensuring continuous production.

Description

Technical Field

[0001] This utility model relates to a dimethyl dicarboxylic acid distillation system, belonging to the field of distillation technology. Background Technology

[0002] Dimethyl diacidate typically refers to a mixture of dimethyl esters of diacids with different carbon chain lengths (such as succinic acid, glutaric acid, and adipic acid). The components in a dimethyl diacidate mixture are fractionated according to their boiling points to obtain relatively pure dimethyl esters of each diacid. The fractionation process is as follows: low-boiling-point components, such as dimethyl succinate (boiling point approximately 195-200°C), are distilled off first; medium-boiling-point components, such as dimethyl glutarate (boiling point approximately 210-220°C), are distilled off subsequently; and high-boiling-point components, such as dimethyl adipic acid (boiling point above approximately 230°C), remain at the end or require vacuum distillation.

[0003] Currently, the distillation columns used in the distillation of dimethyl diacidate are equipped with packing or trays in their distillation channels. As core components of the distillation column, the packing may fail due to scaling, corrosion, or physical damage, while the trays may experience blockages or deformation. Without maintenance, this can lead to decreased separation efficiency, increased energy consumption, and even safety accidents. Therefore, regular inspection and maintenance are essential, which necessitates shutdown and production interruption.

[0004] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0005] To address the shortcomings of the prior art, this utility model provides a dimethyl diacid distillation system that employs two distillation channels, one for use and one for standby, which can achieve a balance between safety and economy while ensuring continuous production.

[0006] To solve the above technical problems, the present invention adopts the following technical solution: A dimethyl diacidate distillation system includes a circular reboiler with two circular connecting ports at the top. Distillation columns are mounted above each connecting port, arranged side-by-side. An electric butterfly valve is installed between the bottom of each distillation column and the connecting port, controlling the connection between the reboiler and the distillation columns. A stirring shaft is inserted at the center of the top of the reboiler. A heat exchange jacket is installed outside the reboiler, forming a closed cavity between the heat exchange jacket and the reboiler. Spiral guide vanes are installed within the closed cavity.

[0007] Furthermore, the bottom end of the distillation column and the top end of the connecting interface are both provided with flanges that are connected to the electric butterfly valve.

[0008] Furthermore, the stirring shaft is set vertically, and stirring blades are installed on the bottom of the stirring shaft. The stirring blades are located in the inner cavity of the tower. The top of the stirring shaft is connected to the output shaft of the motor through a coupling.

[0009] Furthermore, the number of stirring blades is at least two sets.

[0010] Furthermore, a material inlet is provided on one side of the top of the tower.

[0011] Furthermore, a liquid phase outlet is provided on one side of the bottom of the column.

[0012] Furthermore, the heat exchange jacket has a heat transfer medium interface on one side of its bottom and a heat transfer medium outlet on one side of its top.

[0013] Furthermore, the interior of the distillation tower is filled with packing material.

[0014] Furthermore, each of the distillation towers is equipped with a gas phase outlet at the top.

[0015] Furthermore, a manhole is provided on the side wall of the distillation column.

[0016] Compared with the prior art, the present invention, by adopting the above technical solution, has the following advantages: This utility model connects two distillation towers side by side to the top of the distillation vessel, with electric butterfly valves installed at the connection points. The electric butterfly valves can be in the open state at the same time, and the two distillation towers can be used for distillation simultaneously. The two distillation channels are opened synchronously, and the electric butterfly valves can be in the open and closed state at the same time. That is, one of the two distillation towers is in use and the other is on standby. The two distillation channels can be switched with each other to ensure uninterrupted production and achieve a balance between safety and economy.

[0017] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of this utility model; Figure 3 This is an enlarged view of the bottom structure of this utility model.

[0019] In the figure, 1-tower, 2-stirring shaft, 3-motor, 4-connection interface, 5-distillation tower body, 6-electric butterfly valve, 7-packing, 8-gas phase outlet, 9-material inlet, 10-liquid phase outlet, 11-heat exchange jacket, 12-spiral guide vane, 13-heat transfer medium interface, 14-heat transfer medium outlet, 15-manhole. Detailed Implementation

[0020] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.

[0021] like Figures 1-3 As shown in the figure, this utility model provides a dimethyl dicarboxylate distillation system, including a circular column 1, with two circular connecting interfaces 4 on the top of the column 1, and a distillation column 5 above the connecting interfaces 4 respectively. The two distillation column 5 are arranged side by side, and an electric butterfly valve 6 is installed between the bottom of the distillation column 5 and the connecting interface 4. The electric butterfly valve 6 controls the connection between the column 1 and the distillation column 5.

[0022] The electric butterfly valve 6 can be in the open state at the same time, or in the open and closed state at the same time.

[0023] The bottom end of the distillation tower body 5 and the top end of the connecting interface 4 are both provided with flanges that are connected to the electric butterfly valve 6.

[0024] A stirring shaft 2 is installed at the center of the top of the tower 1. The stirring shaft 2 is vertically oriented, and at least two sets of stirring blades are installed on the bottom of the stirring shaft 2. The stirring blades are located inside the tower 1. The top of the stirring shaft 2 is connected to the output shaft of the motor 3 via a coupling. The motor 3 drives the stirring blades to rotate through the stirring shaft 2, so that the material absorbs heat evenly.

[0025] The top side of the tower 1 is provided with a material inlet 9, and the bottom side is provided with a liquid phase outlet 10.

[0026] A heat exchange jacket 11 is installed on the outside of the tower 1, and a closed cavity is formed between the heat exchange jacket 11 and the tower 1. A spiral guide vane 12 is installed inside the closed cavity.

[0027] The heat exchange jacket 11 has a heat transfer medium interface 13 on one side of its bottom and a heat transfer medium outlet 14 on one side of its top.

[0028] The high-temperature heat transfer medium enters the sealed cavity between the heat exchange jacket 11 and the tower 1 and flows in a spiral motion. During the flow process, the material in the tower 1 is heated and its temperature is increased.

[0029] The distillation tower body 5 is equipped with packing material 7 inside.

[0030] Each of the distillation tower bodies 5 is equipped with a gas phase outlet 8 at the top.

[0031] The distillation column body 5 is provided with a manhole 15 on its side wall.

[0032] The specific working principle of this utility model is as follows: Dimethyl diacidate enters the inner cavity of the distillation column 1 through the material inlet 9. The high-temperature heat transfer medium flows spirally in the sealed cavity between the heat exchange jacket 11 and the distillation column 1. During the flow process, the dimethyl diacidate in the distillation column 1 is heated. At the same time, the motor 3 drives the stirring blades to rotate through the stirring shaft 2, so that the dimethyl diacidate absorbs heat and rises in temperature evenly. The low-boiling-point component, medium-boiling-point component and high-boiling-point component in the distillation column 5 are distilled out sequentially through the gas phase outlet 8 at the top of the distillation column body 5. Finally, the residual liquid is output from the liquid phase outlet 10.

[0033] This utility model connects two distillation towers 5 side by side to the top of the reboiler 1. Electric butterfly valves 6 are installed at the connection points. The electric butterfly valves 6 can be in the open state at the same time, and the two distillation towers 5 are used for distillation at the same time. The two distillation channels are opened synchronously. The electric butterfly valves 6 can be in the open and closed state at the same time, that is, one of the two distillation towers 5 is in use and the other is on standby. The two distillation channels can be switched with each other to ensure uninterrupted production.

[0034] The above description provides examples of the preferred embodiments of this utility model. Any aspects not detailed herein are common knowledge to those skilled in the art. The scope of protection of this utility model is determined by the claims. Any equivalent modifications based on the technical teachings of this utility model are also within the scope of protection of this utility model.

Claims

1. A dimethyl phthalate distillation system characterized by: The column includes a circular structure (1), with two circular connecting interfaces (4) on the top of the column (1). Distillation column bodies (5) are respectively provided above the connecting interfaces (4). The two distillation column bodies (5) are arranged side by side. An electric butterfly valve (6) is installed between the bottom of the distillation column body (5) and the connecting interface (4). The electric butterfly valve (6) controls the connection between the column (1) and the distillation column body (5). A stirring shaft (2) is installed at the center of the top of the column (1). A heat exchange jacket (11) is installed on the outside of the column (1). A closed cavity is formed between the heat exchange jacket (11) and the column (1). A spiral guide vane (12) is installed in the closed cavity.

2. The dimethyl ester distillation system for mixed diacids as described in claim 1, characterized in that: The bottom end of the distillation tower body (5) and the top end of the connecting interface (4) are both provided with flanges that are connected to the electric butterfly valve (6).

3. The dimethyl ester distillation system for mixed diacids as described in claim 1, characterized in that: The stirring shaft (2) is set in a vertical direction. Stirring blades are installed on the bottom of the stirring shaft (2). The stirring blades are located in the inner cavity of the tower (1). The top of the stirring shaft (2) is connected to the output shaft of the motor (3) through a coupling.

4. The dimethyl ester distillation system for mixed diacids as described in claim 3, characterized in that: The number of stirring blades should be at least two sets.

5. The dimethyl ester distillation system for mixed diacids as described in claim 1, characterized in that: The top side of the tower (1) is provided with a material inlet (9).

6. The dimethyl ester distillation system for mixed diacids as described in claim 5, characterized in that: The bottom side of the column (1) is provided with a liquid phase outlet (10).

7. The dimethyl ester distillation system for mixed diacids as described in claim 1, characterized in that: The heat exchange jacket (11) has a heat transfer medium interface (13) on one side of its bottom and a heat transfer medium outlet (14) on one side of its top.

8. The dimethyl ester distillation system for mixed diacids as described in claim 1, characterized in that: The distillation tower body (5) is filled with packing material (7).

9. The dimethyl ester distillation system for mixed diacids as described in claim 1, characterized in that: Each of the distillation tower bodies (5) is provided with a gas phase outlet (8) at the top.

10. The dimethyl bisacrylic acid distillation system as described in claim 1, characterized in that: The distillation tower body (5) has a manhole (15) on its side wall.

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