Vacuum distillation and adsorption integrated device for NMP (N-Methyl Pyrrolidone) recovery

Abstract

The utility model discloses a vacuum distillation and adsorption integrated device for NMP (N-Methyl Pyrrolidone) recovery, which comprises a reaction box, a control panel is fixedly arranged on the outer wall of the reaction box, a vacuum case is fixedly arranged outside one side of the reaction box, a liquid storage tank is arranged at the upper end of the reaction box, a delivery pump is arranged on one side of the liquid storage tank, and a vacuum pump is arranged on the other side of the liquid storage tank. A flow meter is arranged on the outer side of the conveying pump, a communicating pipe is fixedly connected to the lower portion of the flow meter, one end of the communicating pipe is arranged in a distillation still in the reaction box, a condenser is arranged above the distillation still, and a connecting pipe is fixedly arranged on the outer wall of the distillation still; one end of the connecting pipe penetrates through the outer wall of the reaction box, the extending end of the connecting pipe is connected with an adsorption column, the distillation still and the condenser are connected through a pipeline, two connecting guide pipes are fixedly arranged at the bottom of the vacuum machine box, the two connecting guide pipes penetrate through the interior of the reaction box, and the extending ends of the two connecting guide pipes are connected into the condenser and the distillation still. NMP can be stably recovered, and the purity of NMP is improved.

Description

Technical Field

[0001] This utility model relates to the field of NMP recovery technology, and in particular to an integrated vacuum distillation and adsorption device for NMP recovery. Background Technology

[0002] The integrated vacuum distillation and adsorption unit for NMP recovery is a professional device that combines vacuum distillation and adsorption technologies to efficiently recover materials containing N-methylpyrrolidone (NMP). By integrating functional modules such as distillation, condensation, and adsorption, it can separate and purify NMP from NMP-containing mixtures or waste gases, achieving the dual goals of resource recycling and environmental pollution reduction.

[0003] Existing NMP recovery and processing methods have some shortcomings. They often result in low recovery efficiency and relatively low purity of NMP, which reduces the processing capacity. Furthermore, existing NMP recovery methods consume a lot of energy. To address these issues, an integrated vacuum distillation and adsorption device for NMP recovery is proposed for improvement and upgrading. Utility Model Content

[0004] The purpose of this invention is to provide an integrated vacuum distillation and adsorption device for NMP recovery, so as to solve the problems mentioned in the background art.

[0005] To address the aforementioned issues, the following technical solution is provided: an integrated vacuum distillation and adsorption device for NMP recovery, comprising a reaction chamber, a control panel fixedly mounted on the outer wall of the reaction chamber, and a vacuum chamber fixedly mounted on one side of the reaction chamber. A storage tank is mounted on the upper end of the reaction chamber, a transfer pump is mounted on one side of the storage tank, a flow meter is mounted on the outside of the transfer pump, a connecting pipe is fixedly connected below the flow meter, and one end of the connecting pipe is located inside the distillation vessel inside the reaction chamber. A condenser is mounted above the distillation vessel, and a connecting pipe is fixedly mounted on the outer wall of the distillation vessel. One end of the connecting pipe penetrates the outer wall of the reaction chamber, and the extended end is connected to an adsorption column.

[0006] As a preferred embodiment of the above technical solution, the distillation vessel and the condenser are connected by a pipe, and two connecting pipes are fixedly installed at the bottom of the vacuum chamber, with the two connecting pipes passing through the inside of the reaction chamber and their extension ends connected to the inside of the condenser and the distillation vessel.

[0007] As a preferred embodiment of the above technical solution, a temperature sensor is fixedly installed on the outer wall of the distillation vessel, activated carbon is fixedly installed inside the adsorption column, and an outlet pipe is provided at the bottom of the adsorption column.

[0008] As a preferred embodiment of the above technical solution, the bottom of the storage tank is provided with a support frame and the support frame is fixedly installed on the upper end of the reaction tank. The upper end of the storage tank is fixedly provided with a liquid inlet and the outer wall of the storage tank is fixedly connected with a liquid outlet pipe.

[0009] As a preferred embodiment of the above technical solution, a triangular tube is provided at one end of the outlet pipe and the other two ends of the triangular tube are respectively connected to the delivery pump and the connecting pipe. A flow meter is fixedly installed in the middle of the connecting pipe and a solenoid valve is provided on the outer wall of the connecting pipe.

[0010] As a preferred embodiment of the above technical solution, the flow meter is provided with a transparent protective cover on its outer wall, and multiple scale lines are fixedly provided inside the flow meter. One end of the connecting pipe passes through the inside of the reaction tank and its extended end is connected to the distillation vessel.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] High-efficiency recovery: Combining vacuum distillation with adsorption columns can significantly improve the recovery efficiency of NMP, resulting in NMP with high purity.

[0013] Energy saving and consumption reduction: Vacuum distillation lowers the distillation temperature and reduces energy consumption. The activated carbon in the adsorption column adsorbs other impurities and recovers NMP from the tail gas, thus avoiding resource waste.

[0014] Good environmental benefits: It effectively reduces NMP emissions, lowers environmental pollution, and meets environmental protection requirements.

[0015] Quantitative control: The mixture in the storage tank is delivered to the flow meter by a delivery pump for observation. Once the appropriate amount is reached, it is delivered to the distillation kettle to improve the sufficiency of the reaction in the distillation kettle and avoid problems such as incomplete reaction caused by excessive mixture.

[0016] 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 adopted. It should be understood that the embodiments of the present invention are not limited in scope therefrom. Within the spirit and scope of the appended claims, the embodiments of the present invention include many changes, modifications, and equivalents. Attached Figure Description

[0017] 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:

[0018] Figure 1 This is a schematic diagram of the overall structure of an integrated vacuum distillation and adsorption device for NMP recovery according to the present invention.

[0019] Figure 2 This is a cross-sectional structural diagram of an integrated vacuum distillation and adsorption device for NMP recovery according to the present invention.

[0020] Figure 3 for Figure 2 Internal structure diagram;

[0021] Figure 4 for Figure 3 A magnified schematic diagram of the local structure.

[0022] In the diagram: 1. Reaction chamber; 2. Storage tank; 21. Inlet; 22. Outlet pipe; 23. Transfer pump; 24. Flow meter; 25. Graduation line; 26. Solenoid valve; 27. Connecting pipe; 3. Vacuum chamber; 4. Control panel; 5. Distillation vessel; 51. Temperature sensor; 6. Condenser; 7. Adsorption column; 71. Connecting pipe; 8. Connecting conduit. Detailed Implementation

[0023] 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.

[0024] like Figures 1 to 4 As shown in the figure, this embodiment provides a vacuum distillation and adsorption integrated device for NMP recovery, including a reaction chamber 1, a control panel 4 fixedly installed on the outer wall of the reaction chamber 1, and a vacuum chamber 3 fixedly installed on one side of the reaction chamber 1. A storage tank 2 is installed at the upper end of the reaction chamber 1, a transfer pump 23 is installed on one side of the storage tank 2, a flow meter 24 is installed outside the transfer pump 23, a connecting pipe 27 is fixedly connected below the flow meter 24, and one end of the connecting pipe 27 is installed inside the distillation vessel 5 inside the reaction chamber 1. A condenser 6 is installed above the distillation vessel 5, and a connecting pipe 71 is fixedly installed on the outer wall of the distillation vessel 5. One end of the connecting pipe 71 passes through the outer wall of the reaction chamber 1 and the extended end is connected to an adsorption column 7.

[0025] like Figure 3 As shown, the distillation vessel 5 and the condenser 6 are connected by pipes. Two connecting pipes 8 are fixedly installed at the bottom of the vacuum chamber 3, and the two connecting pipes 8 pass through the inside of the reaction chamber 1 respectively. Their extension ends are connected to the inside of the condenser 6 and the distillation vessel 5. A temperature sensor 51 is fixedly installed on the outer wall of the distillation vessel 5. Activated carbon is fixedly installed inside the adsorption column 7, and an outlet pipe is installed at the bottom of the adsorption column 7.

[0026] Based on the property that the boiling point of a liquid is related to external pressure, the pressure inside the distillation vessel 5 is reduced by the vacuum chamber 3, thereby lowering the boiling point of NMP. At a lower temperature, NMP can evaporate from the NMP-containing mixture and separate from other impurities with higher boiling points. Since NMP evaporates at a low temperature, the influence of high temperature on NMP quality can be avoided, ensuring that the recovered NMP has high purity and quality. Activated carbon adsorbent has a large specific surface area and porous structure, which gives it a strong adsorption capacity for NMP molecules.

[0027] like Figure 4 As shown, a support frame is provided at the bottom of the storage tank 2 and the support frame is fixedly installed on the upper end of the reaction tank 1. An inlet 21 is fixedly opened at the upper end of the storage tank 2, and an outlet pipe 22 is fixedly connected to the outer wall of the storage tank 2. A triangular tube is provided at one end of the outlet pipe 22, and the other two ends of the triangular tube are respectively connected to the delivery pump 23 and the connecting pipe 27. A flow meter 24 is fixedly installed in the middle of the connecting pipe 27. A solenoid valve 26 is provided on the outer wall of the connecting pipe 27. A transparent protective cover is provided on the outer wall of the flow meter 24, and multiple scale lines 25 are fixedly installed inside the flow meter 24. One end of the connecting pipe 27 passes through the inside of the reaction tank 1 and the extended end is connected to the distillation kettle 5.

[0028] The NMP-containing mixture is pumped from the storage tank 2 to the distillation vessel 5 by the transfer pump 23. At the same time, it is extracted by the outlet pipe 22 and then transported into the flow meter 24. The operator can observe the scale line 25 through the transparent protective cover, thereby accurately controlling the feed rate and flow rate of the mixture, which is convenient for quantitative control during the transport of the mixture.

[0029] The working principle and operation process of this utility model are as follows: First, connect the external power supply. The NMP-containing mixture is transported from the storage tank 2 to the distillation vessel 5 by the delivery pump 23. At the same time, it is extracted through the outlet pipe 22 and then transported into the flow meter 24. The operator observes the scale line 25 through the transparent protective cover to accurately control the feed rate and flow rate of the mixture. After reaching the appropriate amount, the solenoid valve 26 is opened, allowing the mixture to be stably fed into the distillation vessel 5 through the connecting pipe 27. At the same time, the vacuum chamber 3 is started to create a vacuum inside the distillation vessel 5 through the connecting conduit 8 and then extracted, creating a vacuum environment inside the distillation vessel 5. The heating device heats the mixture in the distillation vessel 5. As the temperature rises, NMP reaches its boiling point under the vacuum and evaporates into vapor. The vapor rises and enters the condenser 6. In the condenser 6, the NMP vapor is cooled and condensed into liquid by the cooling medium and flows into the collection container, completing the initial recovery of NMP. The tail gas generated during the distillation process contains residual NMP, causing the tail gas to enter the adsorption column 7 through the connecting pipe 71. The NMP in the adsorption column 7, which is filled with activated carbon adsorbent, is adsorbed by the adsorbent. Then, the purified gas is discharged through the outlet pipe to meet the emission standards, which facilitates the improvement of NMP recovery efficiency.

[0030] 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.

[0031] 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 vacuum distillation and adsorption integrated device for NMP recovery, characterized by, The reaction chamber (1) includes a control panel (4) fixedly installed on the outer wall of the reaction chamber (1), and a vacuum chamber (3) fixedly installed on one side of the reaction chamber (1). A storage tank (2) is installed at the upper end of the reaction chamber (1), and a transfer pump (23) is installed on one side of the storage tank (2). A flow meter (24) is installed on the outside of the transfer pump (23). A connecting pipe (27) is fixedly connected below the flow meter (24), and one end of the connecting pipe (27) is installed inside the distillation vessel (5) inside the reaction chamber (1). A condenser (6) is installed above the distillation vessel (5). A connecting pipe (71) is fixedly installed on the outer wall of the distillation vessel (5). One end of the connecting pipe (71) passes through the outer wall of the reaction chamber (1), and the extended end is connected to an adsorption column (7).

2. The integrated vacuum distillation and adsorption apparatus for NMP recovery according to claim 1, wherein, The distillation vessel (5) and the condenser (6) are connected by a pipe. Two connecting pipes (8) are fixedly installed at the bottom of the vacuum chamber (3), and the two connecting pipes (8) pass through the inside of the reaction chamber (1) and their extension ends are connected to the inside of the condenser (6) and the distillation vessel (5).

3. The integrated vacuum distillation and adsorption apparatus for NMP recovery according to claim 1, wherein, A temperature sensor (51) is fixedly installed on the outer wall of the distillation vessel (5), activated carbon is fixedly installed inside the adsorption column (7), and an outlet pipe is installed at the bottom of the adsorption column (7).

4. The integrated vacuum distillation and adsorption apparatus for NMP recovery according to claim 1, wherein, The storage tank (2) is provided with a support frame at the bottom and the support frame is fixedly installed on the upper end of the reaction tank (1). The upper end of the storage tank (2) is fixedly provided with an inlet (21) and the outer wall of the storage tank (2) is fixedly connected with an outlet pipe (22).

5. The integrated vacuum distillation and adsorption apparatus for NMP recovery according to claim 4, wherein, One end of the outlet pipe (22) is provided with a triangular tube and the other two ends of the triangular tube are respectively connected to the delivery pump (23) and the connecting pipe (27). A flow meter (24) is fixedly installed in the middle of the connecting pipe (27), and a solenoid valve (26) is provided on the outer wall of the connecting pipe (27).

6. The integrated vacuum distillation and adsorption apparatus for NMP recovery according to claim 5, wherein The flow meter (24) is provided with a transparent protective cover on its outer wall, and multiple scale lines (25) are fixedly provided inside the flow meter (24). One end of the connecting pipe (27) passes through the inside of the reaction tank (1) and its extended end is connected to the distillation vessel (5).

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