CN220176085U - Dosing device for stably adding sodium nitrite in carbon five separation process - Google Patents
Dosing device for stably adding sodium nitrite in carbon five separation process Download PDFInfo
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- CN220176085U CN220176085U CN202321337169.7U CN202321337169U CN220176085U CN 220176085 U CN220176085 U CN 220176085U CN 202321337169 U CN202321337169 U CN 202321337169U CN 220176085 U CN220176085 U CN 220176085U
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- sodium nitrite
- tank
- solvent
- pipe
- feeding
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- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 title claims abstract description 204
- 235000010288 sodium nitrite Nutrition 0.000 title claims abstract description 102
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 22
- 238000000926 separation method Methods 0.000 title claims abstract description 20
- 239000002904 solvent Substances 0.000 claims abstract description 106
- 238000001914 filtration Methods 0.000 claims abstract description 36
- 238000004090 dissolution Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 230000001105 regulatory effect Effects 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000007599 discharging Methods 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 abstract description 21
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000009825 accumulation Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 5
- 239000007787 solid Substances 0.000 description 12
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 6
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 4
- 238000006424 Flood reaction Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 235000010344 sodium nitrate Nutrition 0.000 description 2
- 239000004317 sodium nitrate Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Extraction Or Liquid Replacement (AREA)
Abstract
The utility model discloses a dosing device for stably adding sodium nitrite in a carbon five separation process, which comprises a sodium nitrite dissolving and filtering tank and a circulating solvent tank, wherein a solvent discharge port of the sodium nitrite dissolving and filtering tank is connected with a circulating solvent pipeline of the circulating solvent tank; the sodium nitrite dissolving and filtering tank is provided with a sodium nitrite feeding device and at least one solvent feeding port, and the solvent feeding port is connected with a refined solvent feeding pipeline; and a filter device is arranged in the sodium nitrite dissolving and filtering tank. The method solves the problem that sodium nitrite cannot be stably added in the separation production of the carbon five fractions, effectively improves the dissolution efficiency of the sodium nitrite, eliminates accumulation and hardening of the sodium nitrite in the dissolution tank, avoids blockage of pipelines, tower plates and the like caused by enrichment of a large amount of sodium nitrite in an extraction system, and prolongs the production operation period of equipment.
Description
Technical Field
The utility model relates to a dosing device for stably adding sodium nitrite in a carbon five separation process.
Background
Because the boiling points of the fractions of the cracked carbon five are very similar, the properties of raw materials and products are different and the quality requirements are different, common rectification modes such as common rectification, extractive rectification, azeotropic rectification, reactive rectification and the like are used for separating the carbon five, and a polymer grade isoprene product is obtained by adopting a DMF extraction rectification method in the industry.
Since isoprene is very reactive in chemical nature, self-polymerization is very likely to occur, especially in the presence of trace amounts of oxygen in the system. By adding sodium nitrite into the extraction system, trace oxygen can be effectively removed, and the purpose of reducing isoprene self-polymerization is achieved.
At present, the method for adding sodium nitrite to an extraction system is to use sodium nitrite solid for adding, and the circulating solvent of the extraction system is utilized for continuous adding. In the actual adding process, solid sodium nitrite is easy to accumulate and harden in the adding tank, and is not easy to be fully dissolved by DMF, so that the adding amount of the sodium nitrite is less. Meanwhile, as part of sodium nitrite is not completely dissolved by DMF and is entrained into a circulating solvent system, solid sodium nitrite is accumulated in a tray of the extraction tower to block a downcomer, so that the pressure difference of the extraction tower is increased, and the extraction effect is affected. The circulating solvent is used for adding sodium nitrite for a long time, so that a great amount of sodium nitrite in an extraction system is enriched, and when the temperature of materials in the system changes, a great amount of sodium nitrite and sodium nitrate crystals are resolved out, so that pipelines, tower plates or instrument impulse pipes are blocked, and the production operation period of equipment is shortened.
Disclosure of Invention
The utility model provides a dosing device for stably adding sodium nitrite in a carbon five separation process, which solves the problem that sodium nitrite cannot be stably added in the carbon five fraction separation production, effectively improves the dissolution efficiency of sodium nitrite, eliminates accumulation and hardening of sodium nitrite in a dissolution tank, avoids blockage of pipelines, tower plates and the like caused by enrichment of a large amount of sodium nitrite in an extraction system, and prolongs the production operation period of equipment.
The utility model adopts the technical scheme that: the dosing device for stably adding sodium nitrite in the carbon five separation process comprises a sodium nitrite dissolving and filtering tank and a circulating solvent tank, wherein a solvent discharge port of the sodium nitrite dissolving and filtering tank is connected with a circulating solvent pipeline of the circulating solvent tank; the sodium nitrite dissolving and filtering tank is provided with a sodium nitrite feeding device and at least one solvent feeding port, and the solvent feeding port is connected with a solvent feeding pipeline; the filter device is arranged in the sodium nitrite dissolving and filtering tank.
The sodium nitrite dissolving and filtering tank is at least provided with an upper solvent feed inlet and a lower solvent feed inlet, an upper refined solvent feed pipeline is connected with the upper solvent feed inlet, the discharge end of the pipeline extends into the tank and bends downwards to extend to the middle lower part in the tank, a lower refined solvent feed pipeline is connected with the lower solvent feed inlet, and the discharge end of the pipeline extends into the tank and extends to the central axis of the tank for a certain distance and approaches the filtering device.
In one embodiment, the sodium nitrite dissolving filter tank comprises a tank body and a tank cover, wherein the tank cover is detachably connected with the tank body. The sodium nitrite feeding device is arranged at the top of the tank cover and is a feeding hopper, and a feeding valve is arranged at the bottom of the feeding hopper; the upper part of the tank body is provided with an upper solvent feed inlet, the lower part of the tank body is provided with a lower solvent feed inlet, a filter frame is arranged in the tank body, the upper solvent feed inlet is provided with an upper feed pipe, the upper feed pipe is a right-angle bent pipe, a horizontal pipe section of the upper feed pipe horizontally extends to the central axis of the tank body, and a vertical pipe section extends to the middle lower part of the filter frame along the central axis of the tank body; the lower solvent feed inlet is provided with a lower feed pipe which is a horizontal pipe, and the port of the lower feed pipe extends to the outer wall close to the lower part of the filter frame; a discharge hole is arranged in the middle of the tank body and is connected with a circulating solvent pipeline through a discharge pipe.
The upper feed pipe and the lower feed pipe are respectively detachably connected with the upper solvent feed inlet and the lower solvent feed inlet, so that the maintenance and the overhaul are convenient.
The vertical pipe section of the upper feeding pipe extends to the position of 2/3 of the depth of the filtering frame, namely, the distance between the port of the upper feeding pipe and the bottom of the filtering frame is 1/3 of the depth of the filtering frame. The distance between the lower feeding pipe and the outer wall of the filtering frame is 30-50mm.
The center point of the lower solvent feed inlet is 10-30mm higher than the horizontal plane of the bottom of the filter frame.
The outer wall of the tank body of the sodium nitrite dissolving and filtering tank is provided with a heating jacket, a water inlet of the heating jacket is connected with a water inlet pipe, a water outlet of the heating jacket is connected with a water return pipe, and hot water is introduced into the heating jacket to heat the solution in the tank body.
And the upper refined solvent feeding pipeline and the lower refined solvent feeding pipeline are sequentially provided with a mass flowmeter and a regulating valve along the solvent flowing direction.
The discharging pipe is provided with a temperature sensor, the water return pipe is provided with a hot water regulating valve, the temperature sensor monitors the temperature of the solution in the discharging pipe, and the opening degree of the hot water regulating valve is regulated according to the temperature change so as to control the dissolution temperature of sodium nitrite.
The outer walls of the discharging pipe, the heating jacket and the circulating solvent tank are all provided with heat preservation layers.
The bottom of the circulating solvent tank is provided with a temperature sensor for monitoring the temperature of the solution in the tank.
The circulating solvent line of the circulating solvent tank penetrates into the tank and extends to a position of a pipe orifice 50-100mm from the tank bottom.
The beneficial effects are that:
1. the method effectively solves the problem of unstable addition of sodium nitrite in the separation production of the carbon five fractions, effectively improves the dissolution efficiency of the sodium nitrite, eliminates accumulation and hardening of the sodium nitrite in the dissolution tank, realizes stable addition of the sodium nitrite, avoids blockage of pipelines, tower plates and the like caused by enrichment of a large amount of sodium nitrite in an extraction system, and prolongs the production operation period of equipment. Compared with the common adding device for adding sodium nitrite, the fresh refined solvent is continuously and accurately supplemented to the extraction system, so that the phenomenon that the instrument impulse tube is blocked due to analysis of sodium nitrite and sodium nitrate crystals caused by enrichment of a large amount of sodium nitrite in the extraction system is avoided, the phenomenon of distortion of instrument display is avoided, the safety coefficient of equipment is increased, and the safety production of the device is ensured.
2. According to the utility model, an upper refined solvent feeding pipeline and a lower refined solvent feeding pipeline are respectively connected with an upper feeding pipe and a lower feeding pipe of a sodium nitrite dissolving and filtering tank, the refined solvent flushed by the upper feeding pipe at a high flow speed floods sodium nitrite solids at the bottom of the filtering frame, so that the problem that the dissolution efficiency is affected due to hardening caused by accumulation of sodium nitrite solids in the filtering frame is avoided, the refined solvent flushed by the lower solvent feeding port at a high flow speed further enables the sodium nitrite solids in the filtering frame to be in a rolling state, the problem that the dissolution efficiency is affected due to hardening caused by accumulation of sodium nitrite solids in the filtering frame is avoided, and meanwhile, the sodium nitrite solution dissolved in the solvent is effectively brought out of the filtering frame into a solvent system.
3. The sodium nitrite dissolving and filtering tank is provided with a heating jacket, and hot water is introduced to heat the solution in the tank body. The temperature in the sodium nitrite dissolving and filtering tank is regulated and controlled by hot water to reach the temperature of sodium nitrite in the extraction system, so that sodium nitrite is fully dissolved in DMF solvent, the circulating temperature of the extraction system is effectively approached, precipitation caused by temperature change after sodium nitrite is dissolved is prevented, and the phenomenon of blockage of a tower plate of an extraction tower is avoided.
Drawings
The utility model is described in further detail below with reference to the drawings and the detailed description.
Fig. 1 is a schematic structural diagram of an embodiment of the present utility model.
1. The system comprises a first mass flow meter, a first regulating valve, a second mass flow meter, a second regulating valve, a sodium nitrite solvent filter tank, a temperature sensor, a circulating solvent pipeline, a circulating solvent tank, a hot water regulating valve, a circulating solvent tank and a circulating solvent pump.
Fig. 2 is a schematic diagram of the internal partial structure of the sodium nitrite solvent filter tank of the present utility model.
51. The feed valve, 52, upper solvent feed inlet, 53, water inlet, 54, heating jacket, 55, filter frame, 56, lower solvent feed inlet, 57, lower feed pipe, 58, upper feed pipe, 59, compression bolt, 510, gasket, 511, support ring, 512, discharge port, 513, water outlet.
Detailed Description
A dosing device for the stable addition of sodium nitrite during the carbon five separation process as shown in fig. 1 is one embodiment of the present utility model. The dosing device comprises a sodium nitrite dissolving and filtering tank 5 and a circulating solvent tank 8, wherein a solvent discharge hole of the sodium nitrite dissolving and filtering tank 5 is connected with a circulating solvent pipeline 7 of the circulating solvent tank 8. The dissolved sodium nitrite solution is mixed with the circulating solvent of the extraction system on a pipeline, so that the effective fusion of sodium nitrite is realized, and the stability of the concentration of sodium nitrite in a circulating solvent tank is ensured.
The sodium nitrite dissolving and filtering tank 5 comprises a tank body and a tank cover, and the tank cover is detachably connected with the tank body through a flange or a screw nut. The sodium nitrite feeding device is arranged at the top of the tank cover and is a feeding hopper, and the bottom of the feeding hopper is provided with a feeding valve 51. A filter frame 55 is arranged in the tank body, and sodium nitrite is added into the filter frame 55 from a hopper. The upper solvent feed port 52 is arranged at the upper part of the tank body, the lower solvent feed port 56 is arranged at the lower part of the tank body, and the filter frame 55 is arranged inside the tank body. The upper solvent feed port 52 is provided with an upper feed pipe 58, the upper feed pipe 58 is a right-angle elbow pipe, a horizontal pipe section of the upper feed pipe extends horizontally to the central axis of the tank body, and a vertical pipe section extends to the middle lower part of the filter frame 55 along the central axis of the tank body. The vertical tube section of the upper feed tube 58 extends to a position 2/3 of the height of the filter frame 55, i.e. its port is 1/3 of the height of the filter frame 55 from the bottom of the filter frame 55. The refined solvent flushed out at high flow speed floods the sodium nitrite solid at the bottom of the filter frame, so that the problem that the dissolution efficiency is affected due to hardening caused by accumulation of the sodium nitrite solid in the filter frame is avoided.
The lower solvent feed port 56 is provided with a lower feed tube 57, which is a horizontal tube, the port of which extends to the outer wall near the lower portion of the filter frame 55. A discharge hole 512 is arranged in the middle of the tank body, and the discharge hole 512 is connected with the circulating solvent pipeline 7 through a discharge pipe. The distance between the lower feed pipe 57 and the outer wall of the filter frame 55 is 30-50mm. The center point of the lower solvent feed port 56 is 10-30mm higher than the horizontal plane at the bottom of the filter frame 55. The refined solvent which is flushed out at high speed further enables the sodium nitrite solid in the filter frame 55 to be in a rolling state, so that the problem that the dissolution efficiency is affected due to hardening caused by accumulation of the sodium nitrite solid in the filter frame 55 is avoided, and meanwhile, the sodium nitrite solution which is dissolved in the solvent is effectively brought out of the filter frame 55 to enter a solvent system.
The sodium nitrite dissolves the inner wall of the tank body of the filtering tank 5, a supporting ring 511 fixed on the inner wall is arranged below the upper feed inlet 52, and a plurality of screw holes are arranged on the supporting ring. The filter frame 55 is made of a 500-mesh stainless steel filter screen, so that undissolved sodium nitrite solid particles in the filter frame are effectively prevented from entering a solvent extraction system, and the operation period of extraction system equipment is prolonged. The periphery of the upper opening of the filter frame 55 has mounting wings of screw holes, which are overlapped on the support ring 511 and fixed by pressing bolts 59 through the screw holes of both. A gasket 510 is provided between the mounting wings and the support ring 511.
The outer wall of the tank body of the sodium nitrite dissolving and filtering tank 5 is provided with a heating jacket 54. The water inlet 53 of the heating jacket 54 is connected with a water inlet pipe, the water outlet 513 is connected with a water return pipe, and 50 ℃ is introduced into the heating jacket 54
And heating the solution in the tank body by hot water at the temperature of 70 ℃. The solution temperature in the sodium nitrite dissolving and filtering tank is regulated and controlled by hot water to reach the temperature of sodium nitrite in the extraction system, so that sodium nitrite is fully dissolved in DMF solvent, the circulating temperature of the extraction system is effectively approached, precipitation caused by temperature change after dissolution of sodium nitrite is prevented, and the phenomenon of blockage of an extraction tower plate is avoided.
The upper feed pipe 58 is provided with a first mass flow meter 1 and a first regulating valve 2 in this order along the solvent flow direction. The lower feed pipe 57 is provided with a second flowmeter 3 and a second regulating valve 4 in this order along the flow direction of the solvent. The refined solvent quantity can be accurately calculated and controlled through the mass flowmeter and the regulating valve, so that stable dissolution of sodium nitrite is realized
The temperature sensor 6 is arranged on the discharging pipe, the hot water regulating valve 9 is arranged on the water return pipe, the temperature sensor 6 monitors the temperature of the solution in the discharging pipe, and the opening of the hot water regulating valve 9 is regulated according to the temperature change so as to control the dissolution temperature of sodium nitrite.
The outer walls of the discharging pipe, the heating jacket 54 and the circulating solvent tank 8 are all provided with heat insulation layers, so that the heat insulation effect is enhanced, and the solution is always maintained at the working temperature.
A temperature sensor 10 is arranged at the bottom of the circulating solvent tank 8 and is used for monitoring the temperature of the solution in the tank.
The circulating solvent line 7 of the circulating solvent tank 8 penetrates into the tank and extends to a position where the nozzle is 50-100mm from the tank bottom.
Claims (10)
1. The dosing device for stably adding sodium nitrite in the carbon five separation process is characterized by comprising a sodium nitrite dissolving and filtering tank (5) and a circulating solvent tank (8), wherein a solvent discharge port of the sodium nitrite dissolving and filtering tank (5) is connected with a circulating solvent pipeline (7) of the circulating solvent tank; the sodium nitrite dissolving and filtering tank (5) is provided with a sodium nitrite feeding device and at least one solvent feeding port, and the solvent feeding port is connected with a refined solvent feeding pipeline; and a filter device is arranged in the sodium nitrite dissolving and filtering tank.
2. The dosing device for stably adding sodium nitrite in the carbon five separation process according to claim 1, wherein the sodium nitrite dissolution filter tank (5) is provided with at least an upper solvent feed port and a lower solvent feed port, an upper refined solvent feed line is connected with the upper solvent feed port, and a discharge end extends into the tank and bends downwards to extend to the middle lower part in the tank; and a lower refined solvent feeding pipeline is connected with the lower solvent feeding port, and the discharging end extends into the tank and extends to the central axis of the tank body for a distance to be close to the filtering device.
3. The dosing device for stably adding sodium nitrite in the carbon five separation process according to claim 2, wherein the sodium nitrite dissolution filter tank (5) comprises a tank body and a tank cover, and the tank cover is detachably connected with the tank body; the sodium nitrite feeding device is arranged at the top of the tank cover and is a feeding hopper, and a feeding valve (51) is arranged at the bottom of the feeding hopper; the upper solvent feed inlet is arranged at the upper part of the tank body, and the lower solvent feed inlet is arranged at the lower part of the tank body; a filter frame (55) is arranged in the tank body, an upper feed pipe (58) is arranged at the upper solvent feed inlet, the upper feed pipe (58) is a right-angle bent pipe, a horizontal pipe section of the upper feed pipe horizontally extends to the central axis of the tank body, and a vertical pipe section of the upper feed pipe horizontally extends to the middle lower part of the filter frame along the central axis of the tank body; the lower solvent feed inlet is provided with a lower feed pipe (57) which is a horizontal pipe, and the port of the lower feed pipe extends to the outer wall close to the lower part of the filter frame; a discharge hole is formed in the middle of the tank body, and the discharge hole is connected with the circulating solvent pipeline (7) through a discharge pipe.
4. A dosing device for the stable addition of sodium nitrite in a carbon five separation process according to claim 3, wherein the upper feed tube (58) and the lower feed tube (57) are detachably connected to the upper and lower solvent feed ports, respectively.
5. A dosing device for the stable addition of sodium nitrite in a carbon five separation process according to claim 3, wherein the vertical tube section of the upper feed tube (58) extends to a position 2/3 of the depth of the filter frame (55), i.e. the distance between the port and the bottom of the filter frame (55) is 1/3 of the depth of the filter frame (55); the distance between the lower feeding pipe (57) and the outer wall of the filtering frame (55) is 30-50mm.
6. A dosing device for the stable addition of sodium nitrite in a carbon five separation process according to claim 3, wherein the center point of the lower solvent feed inlet is 10-30mm higher than the horizontal plane at which the bottom of the filter frame (55) is located.
7. A dosing device for stably adding sodium nitrite in a carbon five separation process according to claim 3, wherein a heating jacket (54) is arranged on the outer wall of the tank body of the sodium nitrite dissolution filtering tank (5), a water inlet of the heating jacket (54) is connected with a water inlet pipe, and a water outlet of the heating jacket is connected with a water return pipe.
8. A dosing device for stably adding sodium nitrite in a carbon five separation process according to claim 3, wherein a temperature sensor (6) is arranged on the discharge pipe, a hot water regulating valve (9) is arranged on the return pipe, the temperature sensor monitors the temperature of the solution in the discharge pipe, and the opening of the hot water regulating valve (9) is regulated according to the temperature change.
9. A dosing device for stably adding sodium nitrite in a carbon five separation process according to claim 3, wherein a circulating solvent tank temperature sensor (10) is arranged at the bottom of the circulating solvent tank (8) and used for monitoring the temperature of the solution in the tank; the circulating solvent pipeline of the circulating solvent tank (8) penetrates into the tank and extends to a position of 50-100mm away from the bottom of the tank.
10. The dosing device for stably adding sodium nitrite in a carbon five separation process according to claim 3, wherein the upper refined solvent feeding line and the lower refined solvent feeding line are respectively provided with a mass flowmeter and a regulating valve in sequence along the flow direction of the solvent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321337169.7U CN220176085U (en) | 2023-05-29 | 2023-05-29 | Dosing device for stably adding sodium nitrite in carbon five separation process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321337169.7U CN220176085U (en) | 2023-05-29 | 2023-05-29 | Dosing device for stably adding sodium nitrite in carbon five separation process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220176085U true CN220176085U (en) | 2023-12-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321337169.7U Active CN220176085U (en) | 2023-05-29 | 2023-05-29 | Dosing device for stably adding sodium nitrite in carbon five separation process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220176085U (en) |
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2023
- 2023-05-29 CN CN202321337169.7U patent/CN220176085U/en active Active
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