A distillation apparatus for solvent recovery

Abstract

The utility model discloses a kind of distillation devices for solvent recovery, it is related to petrochemical processing technical field, including plate type rectifying column body, the middle part side of plate type rectifying column body is equipped with feed inlet, the bottom side of plate type rectifying column body is equipped with first reboiler, the bottom other side of plate type rectifying column body is equipped with first condenser, the inside of plate type rectifying column body is equipped with tray assembly.The distillation device for solvent recovery, through second reboiler and second condenser in the middle part of plate type rectifying column body, the temperature difference of plate type rectifying column body top and bottom is significantly reduced, make tower temperature distribution more balanced, can realize the step utilization of energy, effectively improve the recovery purity of DBP, and the opening of gas-permeable hole of tray assembly can be dynamically adjusted with the intensity of steam size, effectively improve operation stability and separation efficiency, enhance mass transfer effect and reduce component backmixing, to improve separation precision and product quality.

Description

Technical Field

[0001] This utility model relates to the field of petrochemical processing technology, specifically to a distillation device for solvent recovery. Background Technology

[0002] Petrochemical production, also known as petrochemical industrial production, refers to the industrial activities that use petroleum and natural gas as raw materials to produce petroleum products and petrochemical products through a series of processing processes. This industry mainly includes two parts: petroleum and petrochemicals, and chemicals, covering a wide range of fields from raw material extraction to final product manufacturing.

[0003] Solvent recovery is a crucial step in petrochemical production. In the production of maleic anhydride, a fixed-bed n-butane oxidation process followed by DBP (dibutyl phthalate) absorption and refining is employed. DBP plays a key role as the absorption solvent and needs to be recovered and reused via a distillation column. Existing technology 1 (Chinese patent application CN201920512436.7, filed on 2019-04-16) uses a distillation column for solvent recovery, which includes a container for holding liquid mixtures. The system comprises a distillation kettle, a distillation column connected at one end to the distillation kettle, a condenser connected at the other end of the distillation column, a cooler connected to the condenser via a conduit, multiple storage tanks connected to the cooler via branch pipes, and a PLC control box. The temperature inside the condenser is set higher than the temperature inside the cooler. A reflux pipe is connected to the conduit, and the end of the reflux pipe away from the conduit is connected to the distillation column. The distillation kettle, condenser, cooler, and storage tanks are all electrically connected to the PLC control box. This system improves the recovery rate and performance of liquid mixtures.

[0004] Although existing technologies can recover solvents, the large temperature difference between the bottom and top of the distillation column during operation leads to uneven distribution of the gas and liquid phases within the column, causing entrainment or leakage, reducing tray efficiency, and making it difficult for DBP to be effectively separated. Furthermore, the opening of the gas pore channels in traditional trays is fixed and cannot be dynamically adjusted according to the intensity of the steam, resulting in unstable gas-liquid contact in the column. When the steam load changes, leakage or liquid entrainment is easily caused, reducing separation efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a distillation apparatus for solvent recovery, in order to solve the problems mentioned in the background art, such as the large temperature difference between the top and bottom of the column and the fixed opening of the gas pore channels of the column plates.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a distillation apparatus for solvent recovery, comprising a plate distillation column body, wherein a feed inlet is provided on one side of the middle portion of the plate distillation column body, a first reboiler is provided on one side of the bottom portion of the plate distillation column body, a first condenser is provided on the other side of the bottom portion of the plate distillation column body, and a tray assembly is provided inside the plate distillation column body.

[0007] The tray assembly includes a tray body fixedly connected to the inner wall of the tray distillation column. An overflow weir is provided on one side of the top surface of the tray body, and a guide pipe is provided on one side of the overflow weir. An outer cover is fixedly connected to the top surface of the tray body, and an inner cover is provided inside the outer cover.

[0008] Furthermore, the outer wall of the plate distillation column body is provided with a second reboiler, and the second reboiler is located in the heavy component enrichment area between the bottom of the plate distillation column body and the feed inlet.

[0009] Furthermore, the outer wall of the plate distillation column body is provided with a second condenser, and the second condenser is located in the light component enrichment area between the bottom of the plate distillation column body and the feed inlet.

[0010] Furthermore, the guide pipe is arc-shaped and is fixedly connected to the tower plate body.

[0011] Furthermore, the outer wall of the inner cover is provided with ventilation holes, and the ventilation holes are elongated in shape. The ventilation holes are symmetrically distributed about the central axis of the inner cover, and there are two sets of ventilation holes in the vertical direction.

[0012] Furthermore, a support is provided on the bottom side of the inner wall of the outer cover, and a spring is provided on the top of the support. The inner cover and the outer cover form an elastic mechanism through the spring.

[0013] Furthermore, the bottom side of the outer wall of the inner cover is provided with a limiting slider, and the limiting sliders are symmetrical about the central axis of the inner cover. The inner walls of the outer cover are provided with limiting grooves on both sides, the internal dimensions of which are consistent with the external dimensions of the limiting sliders.

[0014] Compared with the prior art, the beneficial effects of this utility model are: the distillation device for solvent recovery adopts a novel structural design, the specific details of which are as follows: (1) The distillation apparatus for solvent recovery is equipped with a first reboiler, a first condenser, a second reboiler and a second condenser. By setting the second reboiler in the middle of the plate distillation column, the liquid phase can be heated, reducing the consumption of high-temperature heat source, enhancing the vaporization efficiency of the stripping section, reducing the entrainment of heavy components, and cooling the gas phase by setting the second condenser in the middle of the plate distillation column, reducing the demand for low-temperature cooling, controlling the condensation amount in the distillation section, avoiding the loss of light components, significantly reducing the temperature difference between the top and bottom of the plate distillation column, making the temperature distribution in the column more balanced, realizing the cascade utilization of energy, effectively improving the recovery purity of DBP, and reducing the energy consumption of the distillation process.

[0015] (2) The distillation apparatus for solvent recovery is equipped with a tray assembly. The vent channel on the surface of the tray body is composed of an outer cover and an inner cover. The outer wall of the inner cover is provided with two sets of vent holes. The first set of vent holes is a conventional vent hole, while the second set of vent holes can be dynamically adjusted according to the intensity of the steam. As the steam pressure increases, the inner cover gradually moves upward, thereby exposing more of the second set of vent holes, realizing automatic response to dynamic load, improving operational stability and separation efficiency, avoiding liquid leakage at low load or mist entrainment at high load, ensuring uniform contact of the gas and liquid phases on each tray, enhancing mass transfer effect and reducing component backmixing, thereby improving separation accuracy and product quality. Attached Figure Description

[0016] Figure 1 This is a front view structural diagram of the present invention; Figure 2 This is a schematic diagram of the cross-section structure of this utility model; Figure 3 This is a schematic diagram of the tower plate assembly structure of this utility model; Figure 4 This is a cross-sectional structural diagram of the inner and outer covers of this utility model; Figure 5 This is a schematic diagram of the outer casing structure of this utility model; Figure 6 This is a schematic diagram of the inner cover structure of this utility model.

[0017] In the diagram: 1. Plate distillation column body; 2. Feed inlet; 3. First reboiler; 4. First condenser; 5. Second reboiler; 6. Second condenser; 7. Tray assembly; 701. Tray body; 702. Overflow weir; 703. Flow guide pipe; 704. Outer casing; 705. Inner casing; 706. Support; 707. Spring; 708. Vent hole; 709. Limiting slider. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1-6 The present invention provides the following technical solution: a distillation apparatus for solvent recovery.

[0020] Example 1: As Figure 1 and Figure 2 The present invention provides the following technical solution: a distillation apparatus for solvent recovery, comprising a first reboiler 3, a first condenser 4, a second reboiler 5, and a second condenser 6, as shown. Figure 1 As shown, the second reboiler 5 is located in the heavy component enrichment region between the bottom of the plate distillation column body 1 and the feed inlet 2, and as... Figure 1 As shown, the second condenser 6 is located in the light component enrichment area between the bottom of the plate distillation column body 1 and the feed inlet 2, and the first reboiler 3 is located on one side of the bottom of the plate distillation column body 1, while the first condenser 4 is located on the other side of the bottom of the plate distillation column body 1.

[0021] In operation, a second reboiler 5 and a second condenser 6 are installed in the middle of the plate distillation column body 1. The second reboiler 5 uses a heat source with a lower temperature than the first reboiler 3, such as low-pressure steam, to heat the liquid phase, reducing the consumption of high-temperature heat sources, enhancing the vaporization efficiency of the stripping section, and reducing the entrainment of heavy components. The second condenser 6 uses a refrigerant with a higher temperature than the first condenser 4, such as cooling water, to cool the gas phase, reducing the demand for low-temperature cooling, controlling the condensation amount in the rectification section, and preventing the loss of light components. Through this design, by providing segmented heating and cooling, the temperature difference between the top and bottom of the plate distillation column body 1 can be significantly reduced, making the temperature distribution inside the column more balanced, enabling the cascade utilization of energy, effectively improving the recovery purity of DBP, and reducing the energy consumption of the rectification process.

[0022] Example 2: Figures 1-6 The technical solution shown, based on Embodiment 1, also discloses a tray assembly 7, including a tray body 701 fixedly connected to the inner wall of the tray distillation column body 1. An overflow weir 702 is provided on one side of the top surface of the tray body 701, and a guide pipe 703 is provided on one side of the overflow weir 702. An outer cover 704 is fixedly connected to the top surface of the tray body 701, and an inner cover 705 is provided inside the outer cover 704. Figure 4As shown, a bracket 706 is provided on the bottom side of the inner wall of the outer cover 704, and a spring 707 is provided on the top of the bracket 706. The inner cover 705 and the outer cover 704 form an elastic mechanism through the spring 707, as shown. Figure 4 As shown, the bottom side of the outer wall of the inner cover 705 is provided with a limiting slider 709, and the limiting sliders 709 are symmetrical about the central axis of the inner cover 705. The inner walls of the outer cover 704 are provided with limiting grooves on both sides, the internal dimensions of which are consistent with the external dimensions of the limiting sliders 709.

[0023] When using, such as Figure 6 As shown, the outer wall of the inner cover 705 has ventilation holes 708, which are elongated and symmetrically distributed about the central axis of the inner cover 705. There are two sets of ventilation holes 708 in the vertical direction. The first set is normally open, while the second set can dynamically adjust its opening according to the steam intensity. When the steam pressure increases, it pushes the inner cover 705 upwards. The inner cover 705 is held in place by the limiting sliders 709 on both sides of the outer cover. The inner wall of the body 704 slides in the limiting groove, and the spring 707 is stretched. As the steam pressure increases, more of the second set of vent holes 708 in the inner cover body 705 are exposed, thereby automatically responding to dynamic load, improving operational stability and separation efficiency. The adaptive scaling of the second set of vent holes 708 can maintain the optimal gas velocity, avoid liquid leakage at low load or mist entrainment at high load, ensure uniform contact of gas and liquid phases on each tray, enhance mass transfer effect and reduce component backmixing, thereby improving separation accuracy and product quality.

[0024] The above is the entire working process of the device, and the contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0025] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A distillation apparatus for solvent recovery, comprising a plate distillation column body (1), wherein a feed inlet (2) is provided on one side of the middle part of the plate distillation column body (1), a first reboiler (3) is provided on one side of the bottom of the plate distillation column body (1), a first condenser (4) is provided on the other side of the bottom of the plate distillation column body (1), and a tray assembly (7) is provided inside the plate distillation column body (1). Its features are: The tray assembly (7) includes a tray body (701) fixedly connected to the inner wall of the tray distillation column body (1). An overflow weir (702) is provided on one side of the top of the tray body (701). A guide pipe (703) is provided on one side of the overflow weir (702). An outer cover (704) is fixedly connected to the top surface of the tray body (701). An inner cover (705) is provided inside the outer cover (704).

2. The distillation apparatus for solvent recovery according to claim 1, characterized in that: The outer wall of the plate distillation column body (1) is provided with a second reboiler (5), and the second reboiler (5) is located in the heavy component enrichment area between the bottom of the plate distillation column body (1) and the feed inlet (2).

3. The distillation apparatus for solvent recovery according to claim 1, characterized in that: The outer wall of the plate distillation column body (1) is provided with a second condenser (6), and the second condenser (6) is located in the light component enrichment area between the bottom of the plate distillation column body (1) and the feed inlet (2).

4. The distillation apparatus for solvent recovery according to claim 1, characterized in that: The guide pipe (703) is arc-shaped and is fixedly connected to the tray body (701).

5. The distillation apparatus for solvent recovery according to claim 1, characterized in that: The outer wall of the inner cover (705) is provided with ventilation holes (708), and the ventilation holes (708) are elongated. The ventilation holes (708) are symmetrically distributed about the central axis of the inner cover (705). There are two sets of ventilation holes (708) in the vertical direction.

6. The distillation apparatus for solvent recovery according to claim 1, characterized in that: The inner wall bottom of the outer cover (704) is provided with a bracket (706), and the top of the bracket (706) is provided with a spring (707). The inner cover (705) and the outer cover (704) form an elastic mechanism through the spring (707).

7. A distillation apparatus for solvent recovery according to claim 1, characterized in that: The bottom side of the outer wall of the inner cover (705) is provided with a limiting slider (709), and the limiting sliders (709) are symmetrical about the central axis of the inner cover (705). The inner walls of the outer cover (704) are provided with limiting grooves on both sides, the internal size structure of which is consistent with the external size structure of the limiting sliders (709).

Images