High-purity NMP liquid medicine purification system

Abstract

The utility model discloses a high-purity NMP (N-Methyl Pyrrolidone) liquid medicine purification system, relates to the technical field of chemical equipment, and can solve the problems that in the prior art, the concentration of liquid medicine in an NMP material temporary storage barrel is not high, and the recovery requirement is not met. The high-purity NMP liquid medicine purification system comprises a purification device, a liquid medicine temporary storage device and a liquid medicine pipeline, and further comprises a liquid outlet pipeline, a waste liquid pipeline, a waste liquid storage device and a control assembly used for controlling NMP steam liquid medicine in the liquid medicine pipeline to be selectively introduced into the liquid outlet pipeline or the waste liquid pipeline according to temperature changes. The other end of the liquid medicine pipeline is communicated with the inlet of the control assembly; one ends of the liquid outlet pipeline and the waste liquid pipeline are communicated with the outlet of the control assembly, and the other ends are respectively communicated with the liquid medicine temporary storage device and the waste liquid storage device.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to a high-purity NMP liquid purification system. Background Art

[0002] NMP materials have excellent stability and solubility and are widely used in various industries, including petrochemicals, plastics, pharmaceuticals, dyes, lithium-ion battery manufacturing, and electronics. In the electronics industry, NMP materials can be used for photoresist stripping and LCD liquid crystal material production.

[0003] Currently, when NMP is recovered and purified, the liquid to be recovered is typically passed through a purification device. The recovered liquid is then heated to evaporate the NMP material within, forming an NMP liquid. This liquid is then directly passed through a steam pipe into an NMP liquid storage tank. However, this current purification method results in low purity of the NMP liquid in the storage tank, which does not meet the required NMP liquid concentration for recovery. Further processing is required, which increases the purification process and reduces purification efficiency.

[0004] Based on the above background, the inventors designed a high-purity NMP liquid purification system to solve the problem of low liquid concentration caused by direct introduction of the above-mentioned NMP material. Summary of the Invention

[0005] The purpose of this application is to provide a high-purity NMP liquid purification system to solve the problem in the prior art that the liquid concentration in the NMP liquid temporary storage barrel is not high and does not meet the recovery requirements.

[0006] In order to solve the above technical problems, the present invention adopts the following solutions:

[0007] The present application provides a high-purity NMP liquid purification system, comprising a purification device and a liquid temporary storage device, as well as a liquid pipeline, a liquid outlet pipeline, a waste liquid pipeline and a waste liquid storage device, and a control component for controlling the selective passage of NMP vapor liquid in the liquid pipeline into the liquid outlet pipeline or the waste liquid pipeline according to temperature changes;

[0008] One end of the liquid medicine pipeline is connected to the outlet of the purification device, and the other end is connected to the inlet of the control component;

[0009] One end of the liquid outlet pipe and the waste liquid pipe is communicated with the outlet of the control component, and the other end is communicated with the liquid medicine temporary storage device and the waste liquid storage device respectively.

[0010] Optionally, the control component includes a three-way solenoid valve and a temperature sensor for monitoring the temperature value of the outlet of the purification device, and a PLC control board for judging whether the temperature value of the outlet reaches a switching standard value and sending a pipeline switching signal to the multi-way solenoid valve accordingly;

[0011] The probe end of the temperature sensor is installed at the outlet;

[0012] The temperature sensor and the solenoid valve are both electrically connected to the PLC control board.

[0013] Optionally, the switching standard values ​​include 100°C and 120°C.

[0014] Optionally, the purification device includes a purification barrel and a coil heating structure arranged in the purification barrel.

[0015] Optionally, the waste liquid storage device is provided with two liquid storage chambers;

[0016] There are two three-way solenoid valves, namely a first solenoid valve and a second solenoid valve;

[0017] It also includes two waste liquid branches connected to the two liquid storage chambers;

[0018] The inlet of the first solenoid valve is connected to the liquid medicine pipeline, and the two outlets of the first solenoid valve are connected to the liquid outlet pipeline and the waste liquid pipeline respectively;

[0019] The inlet of the second solenoid valve is communicated with the waste liquid pipeline, and the two outlets of the second solenoid valve are communicated with two waste liquid branch pipes respectively.

[0020] Optionally, the waste liquid storage device is provided with a heating structure located in one of the liquid storage chambers;

[0021] A waste liquid outlet is provided in the liquid storage cavity provided with a heating structure, and a waste liquid reflux port is also provided on the purification device;

[0022] It also includes a reflux pipe with one end connected to the waste liquid outlet and the other end connected to the waste liquid reflux port;

[0023] It also includes an on-off valve arranged on the return pipe.

[0024] Optionally, the heating structure is an electric heating structure, and the electric heating structure is electrically connected to the control component.

[0025] Optionally, the on-off valve is an on-off solenoid valve electrically connected to the PLC control board.

[0026] Beneficial effects of the utility model:

[0027] The present application discloses a high-purity NMP liquid purification system, comprising a purification device, a liquid temporary storage device, and a liquid pipeline. The system also comprises a liquid outlet pipeline, a waste liquid pipeline, a waste liquid storage device, and a control component for controlling the selective passage of NMP vapor liquid in the liquid pipeline into the liquid outlet pipeline or the waste liquid pipeline according to temperature changes. One end of the liquid pipeline is connected to the outlet of the purification device, and the other end is connected to the inlet of the control component. One end of the liquid outlet pipeline and the waste liquid pipeline are connected to the outlet of the control component, and the other ends are connected to the liquid temporary storage device and the waste liquid storage device, respectively.

[0028] The design concept is that by providing a liquid outlet pipe, a waste liquid pipe and a waste liquid storage device, as well as a control component that controls the entry of NMP vapor liquid into the liquid pipe or the waste liquid pipe according to temperature changes, it is possible to prevent low-concentration NMP vapor liquid from entering the liquid storage device, thereby reducing the NMP liquid concentration in the liquid storage device, thereby effectively solving the problem in the prior art that the liquid concentration in the NMP liquid storage barrel is not high enough to meet the recovery requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural diagram of Example 1 of the present application.

[0030] Figure 2 This is a structural diagram of Example 2 of this application.

[0031] Description of reference numerals:

[0032] 1-purification barrel, 2-waste liquid storage device, 3-medicine liquid temporary storage device, 4-first solenoid valve, 5-temperature sensor, 6-coil heating structure, 7-medicine liquid pipeline, 8-liquid outlet pipeline, 9-waste liquid pipeline, 10-second solenoid valve, 11-waste liquid branch pipe, 12-reflux pipeline, 13-opening and closing solenoid valve, 14-liquid storage chamber, 15-electric heating structure. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0034] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "opened," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0036] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0037] Example 1:

[0038] like Figure 1 As shown, this embodiment provides a high-purity NMP liquid purification system, including a purification device and a liquid temporary storage device 3, and a liquid pipeline 7, and also includes a liquid outlet pipeline 8, a waste liquid pipeline 9 and a waste liquid storage device 2, and a control component for controlling the selective passage of NMP vapor liquid in the liquid pipeline 7 into the liquid outlet pipeline 8 or the waste liquid pipeline 9 according to temperature changes;

[0039] One end of the liquid medicine pipeline 7 is connected to the outlet of the purification device, and the other end is connected to the inlet of the control component;

[0040] One end of the liquid outlet pipe 8 and the waste liquid pipe 9 is connected to the outlet of the control component, and the other end is connected to the liquid temporary storage device 3 and the waste liquid storage device 2 respectively.

[0041] After research, the inventors found that due to the particularity of NMP material, its volatilization amount is small when the temperature is less than 120°C. Once the temperature reaches the critical value of 120°C, its volatilization amount increases significantly. Existing purification equipment generally purifies by heating, so that the NMP material in the recovered liquid evaporates, but the temperature increase takes a certain amount of time. After the temperature reaches 100°C, water vapor will evaporate in large quantities, but the evaporation amount of NMP material is small. The existing purification equipment is directly introduced into the NMP liquid temporary storage barrel through the steam pipe. Therefore, the purification equipment will introduce low-concentration NMP liquid into the NMP liquid barrel during the process of heating to 120°C, resulting in the liquid concentration in the NMP liquid temporary storage barrel not meeting the requirements after the entire NMP liquid purification process is completed.

[0042] This embodiment provides a liquid outlet pipe 8, a waste liquid pipe 9, and a waste liquid storage device 2, as well as a control component that controls the entry of NMP vapor liquid into the liquid liquid pipe 7 or the waste liquid pipe 9 according to temperature changes. This prevents low-concentration NMP vapor liquid from entering the liquid liquid temporary storage device 3, thereby reducing the NMP liquid concentration in the liquid liquid temporary storage device 3. This effectively solves the problem in the prior art that the liquid concentration in the NMP liquid temporary storage barrel is not high enough to meet the recovery requirements.

[0043] In this embodiment, the control component includes a three-way solenoid valve and a temperature sensor 5 for monitoring the temperature value of the outlet of the purification device, and a PLC control board for determining whether the outlet temperature value reaches the switching standard value and sending a pipeline switching signal to the multi-way solenoid valve accordingly;

[0044] The probe end of the temperature sensor 5 is installed at the outlet;

[0045] The temperature sensor 5 and the solenoid valve are both electrically connected to the PLC control board. The temperature sensor 5 and the solenoid valve are both electrically connected to the PLC control board. The temperature sensor 5 and the PLC control board are both prior art and will not be described in detail here.

[0046] In this embodiment, the switching standard value is 120°C.

[0047] In this embodiment, the purification device includes a purification barrel 1 and a coil heating structure 6 disposed in the purification barrel 1. In this embodiment, the purification barrel 1 and the coil electric heating structure 15 are both conventional technologies.

[0048] Example 2:

[0049] On the basis of the above embodiment 1, Figure 2 As shown, the waste liquid storage device 2 is provided with two liquid storage chambers 14;

[0050] There are two three-way solenoid valves, namely the first solenoid valve 4 and the second solenoid valve 10;

[0051] It also includes two waste liquid branches 11 connected to the two liquid storage chambers 14;

[0052] The inlet of the first solenoid valve 4 is connected to the liquid medicine pipeline 7, and the two outlets of the first solenoid valve 4 are connected to the liquid outlet pipeline 8 and the waste liquid pipeline 9 respectively;

[0053] The inlet of the second solenoid valve 10 is connected to the waste liquid pipeline 9, and the two outlets of the second solenoid valve 10 are connected to two waste liquid branch pipes 11 respectively.

[0054] In this embodiment, the switching standard values ​​include 100°C and 120°C, where 100°C is the critical temperature point for the substantial evaporation of water vapor, and 120°C is the critical temperature point for the substantial evaporation of NMP material. When the temperature is below 100°C, the NMP solution flows into the first liquid storage chamber 14. When the temperature is between 100°C and 120°C, the NMP solution flows into the second liquid storage chamber 14. When the temperature is above 120°C, the NMP solution flows into the liquid temporary storage device 3. The provision of two liquid storage chambers 14 facilitates the storage of the NMP solution in the waste liquid storage device 2 in a gradient manner, facilitating subsequent processing.

[0055] In this embodiment, the waste liquid storage device 2 is provided with a heating structure located in one of the liquid storage chambers 14;

[0056] A waste liquid outlet is provided in the liquid storage cavity 14 provided with a heating structure, and a waste liquid reflux port is also provided on the purification device;

[0057] It also includes a reflux pipe 12 with one end connected to the waste liquid outlet and the other end connected to the waste liquid reflux port;

[0058] It also includes an on-off valve provided on the reflux pipe 12. The reflux pipe 12, the on-off valve, the heating structure and other devices are provided to preliminarily purify the waste liquid of the waste liquid storage device 2 and return it to the purification device for purification, so that the NMP material enters the purification device, thereby reducing the waste of NMP material.

[0059] In this embodiment, the heating structure is an electric heating structure 15, and the electric heating structure 15 is electrically connected to the control component. The electric heating structure 15 is electrically connected to a PLC control board (not shown in the figure). After the purification process of the entire purification device is completed, the waste liquid in the waste liquid storage device 2 can be processed and the NMP material enters the purification device for further purification, thereby reducing NMP material waste.

[0060] In this embodiment, the on-off valve is an on-off solenoid valve 13 electrically connected to the PLC control board for easy control.

[0061] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will be able to make various modifications and improvements without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A high-purity NMP liquid purification system, comprising a purification device and a liquid temporary storage device (3), and a liquid pipeline (7), characterized in that: It also includes a liquid outlet pipe (8), a waste liquid pipe (9), a waste liquid storage device (2), and a control component for controlling the selective passage of NMP vapor liquid in the liquid pipe (7) into the liquid outlet pipe (8) or the waste liquid pipe (9) according to temperature changes; One end of the liquid medicine pipeline (7) is connected to the outlet of the purification device, and the other end is connected to the inlet of the control component; One end of the liquid outlet pipe (8) and the waste liquid pipe (9) is connected to the outlet of the control component, and the other end is connected to the liquid temporary storage device (3) and the waste liquid storage device (2) respectively.

2. A high-purity NMP liquid purification system according to claim 1, characterized in that, The control assembly includes a three-way solenoid valve and a temperature sensor (5) for monitoring the temperature value of the outlet of the purification device, and a PLC control board for judging whether the temperature value of the outlet reaches a switching standard value and sending a pipeline switching signal to the multi-way solenoid valve accordingly; The probe end of the temperature sensor (5) is installed at the outlet; The temperature sensor (5) and the solenoid valve are both electrically connected to the PLC control board.

3. A high-purity NMP liquid purification system according to claim 2, characterized in that, The switching standard values ​​include 100°C and 120°C.

4. A high-purity NMP liquid purification system according to claim 1, characterized in that, The purification device comprises a purification barrel (1) and a coil heating structure (6) arranged in the purification barrel (1).

5. A high-purity NMP liquid purification system according to claim 2, characterized in that, The waste liquid storage device (2) is provided with two liquid storage chambers (14); There are two three-way solenoid valves, namely a first solenoid valve (4) and a second solenoid valve (10); It also includes two waste liquid branches (11) connected to the two liquid storage chambers (14); The inlet of the first solenoid valve (4) is connected to the liquid medicine pipeline (7), and the two outlets of the first solenoid valve (4) are respectively connected to the liquid outlet pipeline (8) and the waste liquid pipeline (9); The inlet of the second solenoid valve (10) is connected to the waste liquid pipeline (9), and the two outlets of the second solenoid valve (10) are respectively connected to the two waste liquid branch pipes (11).

6. A high-purity NMP liquid purification system according to claim 5, characterized in that, The waste liquid storage device (2) is provided with a heating structure located in one of the liquid storage cavities (14); A waste liquid outlet is provided in the liquid storage cavity (14) provided with a heating structure, and a waste liquid reflux port is also provided on the purification device; It also includes a reflux pipe (12) having one end connected to the waste liquid outlet and the other end connected to the waste liquid reflux port; It also includes an on-off valve arranged on the return pipe (12).

7. A high-purity NMP liquid purification system according to claim 6, characterized in that, The heating structure is an electric heating structure (15), and the electric heating structure (15) is electrically connected to the control component.

8. A high-purity NMP liquid purification system according to claim 6, characterized in that, The on-off valve is an on-off solenoid valve (13) electrically connected to the PLC control board.

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