Efficient energy-saving distillation equipment for NMP (N-Methyl Pyrrolidone) recovery

Abstract

The utility model relates to the technical related field of NMP recovery equipment, in particular to efficient energy-saving distillation equipment for NMP recovery, which comprises a device body, a distillation tower, a filter component and a preheating component are arranged in the device body, an air outlet pipe is arranged at the upper end of the distillation tower, the upper end of the air outlet pipe is connected with a condenser, a liquid outlet pipe is arranged on the outer side of the condenser, and the liquid outlet pipe is connected with the filter component. The filtering assembly is arranged at the lower end of the liquid outlet pipe and comprises a filtering box and a filtering element, the preheating assembly is arranged at the front end of the distillation tower and comprises a preheating tank, and a heating pipe is arranged in the preheating tank and can be used for separating and filtering condensed NMP to further remove impurities in the NMP; due to the design of multiple groups of filter elements, the equipment is not easy to block, the filter elements are convenient to disassemble and assemble, convenient to clean and maintain and convenient to independently replace, the initial temperature of a mixture entering the distillation tower can be kept, and the purpose of saving energy is achieved by fully utilizing heat of a produced product.

Description

Technical Field

[0001] This utility model relates to the field of NMP recovery equipment technology, and in particular to a high-efficiency and energy-saving distillation equipment for NMP recovery. Background Technology

[0002] NMP (N-methylpyrrolidone) recovery systems are commonly used solvent recovery systems in industrial production processes. NMP is an organic solvent that is typically used in processes such as polymer dissolution, solvent extraction, and reaction media. Because it is consumed or volatilized during production, recycling and reusing NMP becomes important in order to reduce costs and environmental impact.

[0003] NMP recovery typically requires distillation. However, most existing NMP distillation equipment is simple in structure and has limited functionality, only capable of distilling and condensing NMP. This equipment consumes a lot of energy, and the condensed NMP is not pure enough, requiring further filtration. During this process, impurities can easily clog the filtration equipment, leading to damage and reduced lifespan. Therefore, we need to upgrade and modify the existing technology to overcome these problems and shortcomings. Utility Model Content

[0004] The purpose of this invention is to provide a high-efficiency and energy-saving distillation device for NMP recovery, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] Design an efficient and energy-saving distillation device for NMP recovery, including a device body, which contains a distillation column, a filtration assembly and a preheating assembly. The upper end of the distillation column is provided with an outlet pipe and the upper end of the outlet pipe is connected to a condenser. The outside of the condenser is provided with a liquid outlet pipe.

[0007] The filter assembly is located at the lower end of the liquid outlet pipe, and the filter assembly includes a filter box and a filter element.

[0008] The preheating component is located at the front end of the distillation column, and the preheating component includes a preheating tank, which is equipped with heating tubes.

[0009] Preferably, the filter box has an internal mounting plate with four sets of flow guide holes, the filter element is connected to the lower end of the flow guide holes, and a connecting sleeve is screwed to the upper end of the filter element.

[0010] Preferably, the inner wall of the filter box is welded with an inner support and a positioning post is provided on the inner support. The mounting plate is provided with positioning holes, and the positioning post is inserted into the positioning hole.

[0011] Preferably, the filter box is provided with an upper cover plate at the upper end, and the upper cover plate is connected to the liquid outlet pipe, and the filter box is provided with a discharge pipe at the bottom.

[0012] Preferably, a controller is provided on the outside of the preheating tank, and a feed pipe and a feeding pipe are respectively provided on the upper end of the preheating tank, and the feeding pipe is connected to the distillation tower.

[0013] Preferably, the preheating tank has an insulation layer inside, and an inner frame is provided inside the insulation layer. The heating tube is installed inside the inner frame and is electrically connected to the controller.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. This utility model includes a filter assembly, filter box, top cover plate, inner support, positioning column, mounting plate, positioning hole, guide hole, filter element, and connecting sleeve. The mounting plate is aligned and installed using the inner support and positioning column, and the filter element is guided and fixed to the lower end of the guide hole using the connecting sleeve. This allows for the separation and filtration of condensed NMP, further removing impurities. The multi-set filter element design makes the equipment less prone to clogging, and the filter elements are easy to disassemble, clean, maintain, and replace independently, effectively improving the practicality of the device and the quality of NMP recovery.

[0016] 2. This utility model incorporates a preheating component, a preheating tank, a controller, a feed pipe, a loading pipe, an inner frame, a heating pipe, and an insulation layer. NMP mixture is added through the feed pipe, the controller drives the heating pipe to heat the internal NMP mixture, and the insulation layer maintains the internal temperature. This preheating process ensures the NMP mixture is kept at its initial temperature before entering the distillation column, fully utilizing the heat from the extracted material to achieve energy savings and improves the device's practicality.

[0017] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope. Within the spirit and scope of the appended claims, the embodiments of the present invention include many changes, modifications, and equivalents. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure according to the present utility model;

[0020] Figure 2 This is an exploded view of the overall structure according to this utility model;

[0021] Figure 3 An exploded view of the filter assembly according to this utility model;

[0022] Figure 4 This is an exploded view of the preheating component according to the present invention.

[0023] In the diagram: 1. Main body of the apparatus; 2. Distillation column; 21. Gas outlet pipe; 3. Condenser; 31. Liquid outlet pipe; 4. Filter assembly; 41. Filter box; 42. Top cover plate; 43. Internal support; 44. Positioning column; 45. Mounting plate; 46. Positioning hole; 47. Guide hole; 48. Filter element; 49. Connecting sleeve; 5. Discharge pipe; 6. Preheating assembly; 61. Preheating tank; 62. Controller; 63. Feed pipe; 64. Feeding pipe; 65. Inner frame; 66. Heating tube; 67. Insulation layer. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0025] like Figure 1 As shown in Figure 4, this embodiment provides a high-efficiency and energy-saving distillation device for NMP recovery, including a device body 1. The device body 1 includes a distillation column 2, a filter assembly 4, and a preheating assembly 6. The upper end of the distillation column 2 is provided with an outlet pipe 21, and the upper end of the outlet pipe 21 is connected to a condenser 3. The outside of the condenser 3 is provided with a liquid outlet pipe 31.

[0026] In this embodiment, the filter assembly 4 is located at the lower end of the liquid outlet pipe 31. The filter assembly 4 includes a filter box 41 and a filter element 48. The upper end of the filter box 41 is provided with a top cover plate 42, which is connected to the liquid outlet pipe 31. The bottom of the filter box 41 is connected to a discharge pipe 5. The filter box 41 is provided with a mounting plate 45 inside, and four sets of guide holes 47 are opened on the mounting plate 45. The filter element 48 is connected to the lower end of the guide holes 47. A connecting sleeve 49 is screwed to the upper end of the filter element 48. An inner support 43 is welded to the inner wall of the filter box 41, and a positioning post 4 is provided on the inner support 43. 4. The mounting plate 45 is provided with positioning holes 46, and the positioning pins 44 are inserted into the positioning holes 46. The mounting plate 45 is aligned and installed by the inner bracket 43 and the positioning pins 44. The filter element 48 is fixed to the lower end of the guide hole 47 by the connecting sleeve 49. The condensate is guided and filtered through the guide hole 47 and the filter element 48, thereby realizing the separation and filtration of the condensed liquid NMP and further removing impurities. The multiple filter elements 48 can effectively prevent equipment blockage and ensure the smoothness of filtration and the efficiency of NMP recovery.

[0027] In this embodiment, the preheating component 6 is located at the front end of the distillation column 2. The preheating component 6 includes a preheating tank 61, with a heating tube 66 inside the preheating tank 61 and a controller 62 on the outside of the preheating tank 61. The upper end of the preheating tank 61 is provided with a feed pipe 63 and a feeding pipe 64, which are electrically connected to the distillation column 2. The preheating tank 61 has an insulation layer 67 inside, and an inner frame 65 is provided inside the insulation layer 67. The heating tube 66 is installed inside the inner frame 65 and electrically connected to the controller 62. NMP mixture is added through the feed pipe 63, and the controller 62 drives the heating tube 66 to work and heat the internal NMP mixture. The insulation layer 67 keeps the interior warm. The preheated NMP mixture is fed into the distillation column 2 through the feeding pipe 64, thereby achieving preheating treatment of the NMP mixture, which helps to maintain its initial temperature when entering the distillation column 2, making full use of the heat of the extracted material to achieve energy saving and improving the practicality of the device.

[0028] The working principle and process of this utility model are as follows: In use, the NMP mixture is added into the preheating tank 61 through the feed pipe 63. The controller 62 drives the heating tube 66 to work and heat the NMP mixture inside. The insulation layer 67 keeps the inside warm. The preheated NMP mixture is fed into the distillation tower 2 through the feed pipe 64. The NMP mixture is distilled through the distillation tower 2. Since NMP has a low boiling point, it can evaporate in this process, while other components remain at the bottom. The evaporated NMP enters the condenser 3 through the gas outlet pipe 21 and condenses into liquid. The condensed liquid NMP enters the filter assembly 4. Multiple filter elements 48 separate and filter the condensed NMP liquid to further remove impurities. Multiple filter elements 48 work simultaneously, so clogging is not likely to occur.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

Claims

1. A high-efficiency and energy-saving distillation device for NMP recovery, characterized in that: The device includes a main body (1), which contains a distillation column (2), a filter assembly (4) and a preheating assembly (6). The upper end of the distillation column (2) is provided with an outlet pipe (21) and the upper end of the outlet pipe (21) is connected to a condenser (3). The outside of the condenser (3) is provided with a liquid outlet pipe (31). The filter assembly (4) is located at the lower end of the liquid outlet pipe (31), and the filter assembly (4) includes a filter box (41) and a filter element (48); The preheating component (6) is located at the front end of the distillation column (2). The preheating component (6) includes a preheating tank (61), and the preheating tank (61) is provided with a heating tube (66).

2. The high-efficiency and energy-saving distillation equipment for NMP recovery according to claim 1, characterized in that: The filter box (41) is provided with an installation plate (45) and four sets of guide holes (47) are provided on the installation plate (45). The filter element (48) is connected to the lower end of the guide hole (47), and a connecting sleeve (49) is screwed to the upper end of the filter element (48).

3. The high-efficiency and energy-saving distillation equipment for NMP recovery according to claim 2, characterized in that: The filter box (41) has an inner support (43) welded to its inner wall and a positioning post (44) provided on the inner support (43). The mounting plate (45) has a positioning hole (46) and the positioning post (44) is inserted into the positioning hole (46).

4. The high-efficiency and energy-saving distillation equipment for NMP recovery according to claim 3, characterized in that: The filter box (41) is provided with an upper cover plate (42) at the upper end and the upper cover plate (42) is connected to the liquid outlet pipe (31). The filter box (41) is provided with a discharge pipe (5) at the bottom.

5. The high-efficiency and energy-saving distillation equipment for NMP recovery according to claim 1, characterized in that: The preheating tank (61) is equipped with a controller (62) on the outside. The upper end of the preheating tank (61) is equipped with a feed pipe (63) and a feeding pipe (64), and the feeding pipe (64) is connected to the distillation column (2).

6. The high-efficiency and energy-saving distillation equipment for NMP recovery according to claim 5, characterized in that: The preheating tank (61) has an insulation layer (67) inside and an inner frame (65) inside the insulation layer (67). The heating tube (66) is installed inside the inner frame (65) and is electrically connected to the controller (62).

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