NMP purification skid-mounted equipment
By designing a skid-mounted NMP purification system, combined with a reboiler, stripping column, and distillation column, the problems of high transportation costs and low purity in NMP recovery were solved, achieving efficient and flexible NMP purification with a purity of 99.9% and reducing transportation costs.
Patent Information
- Application Number
- CN202423084503.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2034-12-13
AI Technical Summary
In existing technologies, NMP recycling processes suffer from high transportation costs and safety issues, leading to malfunctions in small-scale projects. Furthermore, the recycled NMP contains moisture and high-boiling-point substances, making it difficult to achieve high purity standards.
A skid-mounted NMP purification device was designed, including a reboiler, a stripping column, and a rectification column. Through a combination of high-boiling-point removal and dehydration processes, and using a side-stream sampling method, efficient separation and purification of NMP are achieved. The device's operating parameters are automatically controlled by a PLC.
It achieves efficient separation of water and high-boiling substances in NMP with a purity of 99.9%, reducing transportation costs and improving operational flexibility and equipment utilization.
Smart Images
Figure CN223788080U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to NMP purification field especially relates to a NMP purification pry equipment. BACKGROUND
[0002] With the rapid development of lithium battery industry, NMP is used as an important raw material. In the production process of lithium battery, N- methyl pyrrolidone (NMP) discharged in the coating machine oven is one of the main components of coating machine oven exhaust gas, and has high recycling value. At present, NMP in waste gas is mainly recovered by water absorption method or zeolite runner. The recovered NMP contains certain moisture and high-boiling substances, which needs to be transported to the recovery plant by tank car and refined to a purity of 99.9wt% or more. Due to the cost and safety of transportation, it greatly affects the normal operation of small-scale projects. Based on this, the integrated purification device capable of refining NMP on site is made by considering the factors of reducing cost, transportation, NMP loading and unloading and pretreatment. SUMMARY
[0003] The utility model provides a kind of NMP purification pry equipment, and purification efficiency is high, and operation mode is flexible, and it is compact to occupy area.
[0004] The utility model provides a kind of NMP purification pry equipment, including reboiler, stripping column, rectifying column, and the container of raw material is communicated with reboiler feed inlet by first conveying device, the stripping column is located at the top of the reboiler, and the top outlet of the stripping column is communicated with the column still of the rectifying column;
[0005] The top outlet of the rectifying column is communicated with condenser, and the outlet of the condenser is communicated with the inlet of reflux tank, and the outlet of the reflux tank is communicated with the inlet of second conveying device, and the outlet of the second conveying device is connected to rectifying column and the container of light component in column top respectively;
[0006] The column still outlet of the rectifying column is communicated with the inlet of third conveying device, and the outlet of the third conveying device is connected to stripping column and the container of column still product respectively.
[0007] In some embodiments, the packing height of the stripping column is 1-3m.
[0008] In some embodiments, the packing height of the rectifying column is 2-3.5m.
[0009] In some embodiments, the operating pressure of the stripping column and rectifying column is 5-25kpa.
[0010] In some embodiments, pressure sensor is arranged in the condenser.
[0011] In some embodiments, a circulating pump is further included, an inlet of the circulating pump is connected with the reboiler, and outlets of the circulating pump are connected with the stripping column tower kettle and the kettle storage tank respectively.
[0012] In some embodiments, the stripping column and the rectifying column adopt wire mesh regular fillers.
[0013] In some embodiments, liquid level meters are arranged in the reboiler, the rectifying column tower kettle and the reflux tank.
[0014] In some embodiments, the stripping column and the reboiler are connected through flanges.
[0015] Compared with the prior art, the high-boiling substances are removed by the stripping column, and the water and the high-boiling substances in the NMP raw material are separated and removed in a targeted manner, and the high-purity NMP with a purity of more than 95% and a weight percentage of more than 99.9% can be recovered in a high-purification efficiency through the side-line extraction mode. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 A flow chart of the NMP purification skid-mounted equipment of the utility model. DETAILED DESCRIPTION
[0017] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model; obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments, and all other embodiments obtained by those skilled in the art without creative labor on the basis of the embodiments in the utility model belong to the protection scope of the utility model.
[0018] In the description of the utility model, it should be explained that the terms "upper", "lower", "inner", "outer", "top / bottom end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0019] In the description of the utility model, it is necessary to explain that, unless there are explicit provisions and limitations, the terms "installation", "set", "sleeve / interface", "connection" and the like should be understood broadly, for example, "connection", can be wall-mounted connection, can also be detachable connection, or integrally connected, can be mechanical connection, can also be electrical connection, can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication between two elements, for those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0020] Referring to Figure 1 The embodiment provides a kind of NMP purification skid equipment, including reboiler 2, the distillation column 3 of the packing height of 1-3m, the rectifying column 4 of the packing height of 2-3.5m, the distillation column 2 and rectifying column 3 use wire mesh regular packing, reboiler 2 is kettle type reboiler;
[0021] The container containing raw materials is communicated with the feed inlet of reboiler 2 by the first conveying device feed pump 1, the distillation column 3 is connected by flange with reboiler 2 and is arranged above reboiler 2, the overhead outlet of the distillation column 3 is communicated with the column still of the rectifying column 4;
[0022] The overhead outlet of the rectifying column 4 is communicated with condenser 5, the outlet of condenser 5 is communicated with the inlet of reflux tank 6, the outlet of reflux tank 6 is communicated with the inlet of the second conveying device reflux pump 8, and the outlet of the reflux pump 8 is connected to the rectifying column 4 and the container waste water tank 7 containing overhead light component respectively.
[0023] The column still outlet of the rectifying column 4 is communicated with the inlet of the third conveying device production pump 12, and the outlet of the production pump 12 is connected to the distillation column 3 and the container product buffer tank 9 containing column still product respectively.
[0024] The raw material is transported to reboiler 2 by feed pump 1, and under the heating action of water vapor, the raw material liquid is heated into raw material vapor into distillation column 3, wherein the amount of water vapor is controlled according to the overhead temperature of distillation column 3. After the raw material vapor passes through the separation of distillation column 3, the high-boiling substance remains in the distillation column, and NMP and water continue to enter the rectifying column 4. Under the further separation action of rectifying column 4, only light component water exists in the overhead. Light component water enters reflux tank 6 under the action of condenser 5, and under the action of reflux pump 8, part of it is refluxed to rectifying column 4, and part of it is produced to waste water tank 7. NMP is gathered at the bottom of rectifying column 4, and under the action of production pump 12, part of it is produced as product, and part of it is refluxed to distillation column 3. During the operation of the equipment, the operating pressure of the equipment is maintained at 5-25kpa.
[0025] In order to prevent the reboiler 2 from coking and discharging heavy components, in the embodiment, a circulating pump 11 is further included, the inlet of the circulating pump 11 is connected with the reboiler 2, and the outlet of the circulating pump 11 is connected with the distillation column tank and the tank storage tank 10 respectively. Through the circulating pump 11 in the reflux circulation process, part of the tank liquid is extracted, and the reboiler 2 is prevented from coking.
[0026] Further, in the embodiment, a pressure sensor is arranged in the condenser 5, and the negative pressure in the column is controlled according to the pressure sensor. Liquid level meters are further arranged in the reboiler 2, the distillation column tank and the reflux tank 6.
[0027] Meanwhile, the device automatically controls the column operation parameters by PLC, automatically adjusts the valve opening degree based on the parameters by increasing the valve, and can solve the problem of the change of the processing capacity or the water content in the raw materials, and simply and safely performs the operation.
[0028] The device of the embodiment separates and removes the water and high-boiling substances in the NMP raw material waste liquid, cooperates with the side line extraction mode, recovers, has reasonable structure design, good separation effect, high purification efficiency, and the purity of the treated NMP can reach 99.9%.
[0029] The above is only the preferred specific embodiment of the present application, but the design concept of the present application is not limited to this, any skilled person in the art can make non-essential changes to the present application within the technical range disclosed by the present application, and such changes belong to the acts of infringing the protection range of the present application.
Claims
1. A NMP purification skid comprising a reboiler, a stripping column, a rectification column, characterized in that, The container containing raw materials is communicated with the feeding port of the reboiler through the first conveying device, the stripping column is arranged above the reboiler, and the overhead outlet of the stripping column is communicated with the tank of the rectifying column; The overhead outlet of the rectifying column is communicated with the condenser, the outlet of the condenser is communicated with the inlet of the reflux tank, the outlet of the reflux tank is communicated with the inlet of the second conveying device, and the outlet of the second conveying device is respectively connected to the rectifying column and the container containing the overhead light component; The tank outlet of the rectifying column is communicated with the inlet of the third conveying device, and the outlet of the third conveying device is respectively connected to the stripping column and the container containing the tank product.
2. The NMP purification skid of claim 1, wherein, The packing height of the stripping column is 1-3 m.
3. The NMP purification skid of claim 1, wherein, The packing height of the rectifying column is 2-3.5 m.
4. The NMP purification skid of claim 1, wherein, The operating pressure of the stripping column and the rectifying column is 5-25 kpa.
5. The NMP purification skid of claim 1, wherein, A pressure sensor is arranged in the condenser.
6. The NMP purification skid of claim 1, wherein, A circulating pump is further included, the inlet of the circulating pump is connected with the reboiler, and the outlet of the circulating pump is respectively connected with the tank of the stripping column and the tank of the reflux tank.
7. The NMP purification skid of claim 1, wherein, The stripping column and the rectifying column adopt wire mesh structured packing.
8. The NMP purification skid of claim 1, wherein, Liquid level meters are arranged in the reboiler, the tank of the rectifying column and the reflux tank.
9. The NMP purification skid of any of claims 1-8, wherein, The stripping column and the reboiler are connected through flanges.