Device for extracting NMP (N-Methyl Pyrrolidone) in conductive agent by utilizing reverse osmosis membrane

Abstract

The utility model discloses a device for extracting NMP (N-Methyl Pyrrolidone) in a conductive agent by utilizing a reverse osmosis membrane, which relates to the technical field of NMP purification devices, and comprises a plurality of filters which are sequentially communicated, the top of the first-stage filter is provided with a feed port, and the bottom of the last-stage filter is provided with a discharge port; a filtering membrane is arranged in the middle of each filter, and the filtering diameters of the filtering membranes in the plurality of filters are gradually reduced. Compared with an existing purification process, the purification process has the advantages that the required energy consumption is lower, and the repeated utilization rate of NMP can be increased.

Description

Technical Field

[0001] The utility model relates to the technical field of NMP purification devices, in particular to a device for extracting NMP from a conductive agent by utilizing a reverse osmosis membrane. Background Art

[0002] The patent publication number CN115108958A discloses a method for purifying NMP, including S1, dehydration, in which a raw material delivery pump delivers the raw material liquid to a dehydration tower, dehydrates the raw material liquid to obtain a primary mixed liquid; S2, distillation, in which a dehydration tower bottom liquid pump delivers the primary mixed liquid to a fractionating tower, distills the primary mixed liquid to obtain a secondary mixed liquid; S3, steaming, in which a fractionating tower bottom liquid pump delivers the secondary mixed liquid to a product tower, steams the secondary mixed liquid to obtain NMP; S4, primary condensation; S5, after the NMP enters the first reflux tank, the product tower reflux pump delivers a portion of the NMP to the product tower, and the remaining NMP undergoes secondary condensation; S6, a regulating valve delivers the NMP after the secondary condensation to a product tank, analyzes and tests the NMP in the product tank, and if the analysis and test are qualified, delivers the NMP to a storage tank. After the raw material liquid is dehydrated, distilled and steamed in sequence, most of the water in the raw material liquid can be separated, and the purity of the purified NMP is ≥99.5% (ppm), ensuring the high purity of NMP.

[0003] Existing methods for NMP purification mostly use distillation, but NMP has a high boiling point at normal pressure, resulting in high energy consumption and high requirements for operational precision. Summary of the Invention

[0004] In order to solve the problems existing in the above-mentioned prior art, the purpose of the utility model is to provide a device for extracting NMP from a conductive agent using a reverse osmosis membrane, which uses multi-stage filtration to extract NMP from the conductive agent, greatly reducing the energy consumption of the current recycling of NMP in waste conductive agents.

[0005] To achieve the above purpose, the present invention provides the following solutions:

[0006] The utility model provides a device for extracting NMP from a conductive agent by utilizing a reverse osmosis membrane. The device comprises a plurality of filters which are connected in sequence, wherein a feed port is provided at the top of the first-stage filter, and a discharge port is provided at the bottom of the last-stage filter; a filter membrane is provided in the middle of the filter, and the filter diameters of the filter membranes in the plurality of filters gradually decrease.

[0007] Optionally, a purge mechanism is provided below the filter membrane.

[0008] Optionally, the purge mechanism includes a valve and a purge pipe, one end of the valve is connected to the air source, the other end of the valve is connected to one end of the purge pipe, and the other end of the purge pipe extends to below the filter membrane.

[0009] Optionally, the gas source is used to provide nitrogen.

[0010] Optionally, adjacent filters are connected via a pipeline, one end of the pipeline is connected to the bottom of the upper filter, and the other end of the pipeline is connected to the top of the lower filter; a pump is provided on the pipeline.

[0011] Optionally, it includes a primary filter, a secondary filter, a tertiary filter and a fourth filter connected in sequence; a primary filter membrane is provided in the middle of the primary filter; a secondary filter membrane is provided in the middle of the secondary filter; a tertiary filter membrane is provided in the middle of the tertiary filter; and a fourth filter membrane is provided in the middle of the fourth filter.

[0012] Optionally, the pore size of the filter membrane of the primary filter is 10 μm.

[0013] Optionally, the filter membrane pore size of the secondary filter is 1 μm.

[0014] Optionally, the pore size of the filter membrane of the three-stage filter is 50 nm.

[0015] Optionally, the pore size of the filter membrane of the four-stage filter is 1 nm.

[0016] Compared with the prior art, the utility model has achieved the following technical effects:

[0017] The utility model utilizes a device for extracting NMP from a conductive agent using a reverse osmosis membrane, and performs graded filtration on the conductive agent through a multi-stage filtration membrane. Compared with existing purification processes, the required energy consumption is lower and the reuse rate of NMP can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic structural diagram of a device for extracting NMP from a conductive agent using a reverse osmosis membrane in the present invention.

[0020] Description of reference numerals:

[0021] 1. Feed port; 2. Primary filter; 3. Primary filter membrane; 4. Purge pipe; 5. Valve; 6. Pump; 7. Secondary filter; 8. Secondary filter membrane; 9. Third-stage filter; 10. Third-stage filter membrane; 11. Fourth-stage filter; 12. Fourth-stage filter membrane; 13. Discharge port. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] The utility model utilizes the high precision of the pore size of the reverse osmosis membrane and utilizes a multi-stage filtration method to accurately filter out unnecessary conductive agent impurities, thereby achieving the purpose of extracting NMP.

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0025] like Figure 1 As shown, this embodiment provides a device for extracting NMP from a conductive agent using a reverse osmosis membrane, comprising four filters connected in sequence, namely, a primary filter 2, a secondary filter 7, a tertiary filter 9 and a quaternary filter 11; a feed port 1 is provided at the top of the primary filter 2, and a discharge port 13 is provided at the bottom of the quaternary filter 11; a primary filter membrane 3 with a pore size of 10 μm is provided in the middle of the primary filter 2 to filter out large particles to reduce subsequent filtration resistance; a secondary filter membrane 8 with a pore size of 1 μm is provided in the middle of the secondary filter 7 to filter out medium particles; a tertiary filter membrane 10 with a pore size of 50 nm is provided in the middle of the tertiary filter 9 to filter out small particles; a quaternary filter membrane 12 with a pore size of 1 nm is provided in the middle of the quaternary filter 11 to filter out fine particles; and finally, the filtered NMP product is collected through the discharge port 13.

[0026] A purge mechanism is located below the filter membrane. It includes a valve 5 and a purge tube 4. One end of the valve 5 is connected to a gas source, while the other end is connected to one end of the purge tube 4. The other end of the purge tube 4 extends below the filter membrane. The gas source provides nitrogen.

[0027] Adjacent filters are connected via a pipeline, one end of the pipeline is connected to the bottom of the upper filter, and the other end of the pipeline is connected to the top of the next filter 2; a pump 6 is provided on the pipeline.

[0028] The filter membrane is made of polytetrafluoroethylene membrane material, which is resistant to NMP corrosion and has a longer service life.

[0029] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and range of equivalents of the claims be included in the present invention, and any reference signs in the claims should not be regarded as limiting the claims involved.

[0030] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A device for extracting NMP from a conductive agent using a reverse osmosis membrane, characterized in that: It comprises a plurality of filters connected in sequence, a feed port is provided at the top of the first-stage filter, and a discharge port is provided at the bottom of the last-stage filter; a filter membrane is provided in the middle of the filter, and the filter diameters of the filter membranes in the plurality of filters gradually decrease.

2. The device for extracting NMP from a conductive agent using a reverse osmosis membrane according to claim 1, wherein A purge mechanism is provided below the filter membrane.

3. The device for extracting NMP from a conductive agent using a reverse osmosis membrane according to claim 2, wherein: The purge mechanism includes a valve and a purge pipe, one end of the valve is connected to the air source, the other end of the valve is connected to one end of the purge pipe, and the other end of the purge pipe extends to the bottom of the filter membrane.

4. The device for extracting NMP from a conductive agent using a reverse osmosis membrane according to claim 3, wherein The gas source is used to provide nitrogen.

5. The device for extracting NMP from a conductive agent using a reverse osmosis membrane according to claim 1, wherein The adjacent filters are connected through a pipeline, one end of the pipeline is connected to the bottom of the upper filter, and the other end of the pipeline is connected to the top of the lower filter; a pump is provided on the pipeline.

6. The device for extracting NMP from a conductive agent using a reverse osmosis membrane according to claim 1, wherein It comprises a primary filter, a secondary filter, a tertiary filter and a quaternary filter which are connected in sequence; a primary filter membrane is provided in the middle of the primary filter; a secondary filter membrane is provided in the middle of the secondary filter; a tertiary filter membrane is provided in the middle of the tertiary filter; and a quaternary filter membrane is provided in the middle of the quaternary filter.

7. The device for extracting NMP from a conductive agent using a reverse osmosis membrane according to claim 6, wherein: The pore size of the filter membrane of the primary filter is 10 μm.

8. The device for extracting NMP from a conductive agent using a reverse osmosis membrane according to claim 6, wherein: The filter membrane pore size of the secondary filter is 1 μm.

9. The device for extracting NMP from a conductive agent using a reverse osmosis membrane according to claim 6, wherein: The pore size of the filter membrane of the three-stage filter is 50 nm.

10. The device for extracting NMP from a conductive agent using a reverse osmosis membrane according to claim 6, characterized in that: The pore size of the filter membrane of the four-stage filter is 1 nm.

Images