CN215712845U - Low-temperature methanol washing device - Google Patents
Low-temperature methanol washing device Download PDFInfo
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- CN215712845U CN215712845U CN202120267839.7U CN202120267839U CN215712845U CN 215712845 U CN215712845 U CN 215712845U CN 202120267839 U CN202120267839 U CN 202120267839U CN 215712845 U CN215712845 U CN 215712845U
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 617
- 238000005406 washing Methods 0.000 title claims abstract description 33
- 238000010521 absorption reaction Methods 0.000 claims abstract description 55
- 238000003795 desorption Methods 0.000 claims abstract description 52
- 230000008929 regeneration Effects 0.000 claims abstract description 29
- 238000011069 regeneration method Methods 0.000 claims abstract description 29
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 20
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 20
- 238000010992 reflux Methods 0.000 claims abstract description 19
- 239000002253 acid Substances 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims abstract description 4
- 238000001704 evaporation Methods 0.000 claims description 32
- 230000008020 evaporation Effects 0.000 claims description 32
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 19
- 229910052717 sulfur Inorganic materials 0.000 claims description 19
- 239000011593 sulfur Substances 0.000 claims description 19
- 239000006096 absorbing agent Substances 0.000 claims description 5
- 239000005864 Sulphur Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 43
- 229910000037 hydrogen sulfide Inorganic materials 0.000 abstract description 10
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 abstract description 9
- 230000009102 absorption Effects 0.000 description 32
- 229910002092 carbon dioxide Inorganic materials 0.000 description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009103 reabsorption Effects 0.000 description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The utility model discloses a low-temperature methanol washing device, which comprises an absorption tower, a thermal regeneration tower and a heat exchanger, wherein the absorption tower is used for absorbing acid gas in synthesis gas, and the absorption tower is used for removing CO in methanol-rich gas from the absorption tower2The thermal regeneration tower is used for removing H in the methanol-rich liquid from the desorption tower2S, the heat exchanger is used for exchanging heat between the poor methanol in the thermal regeneration tower and the analysis methanol in the analysis tower; the low-temperature methanol washing device also comprises a poor methanol high-pressure pump used for sending the poor methanol after heat exchange to the absorption tower and an analysis methanol pump used for sending the analysis methanol of the analysis tower to the thermal regeneration tower, wherein the minimum reflux pipeline of the analysis methanol pump is communicated with the analysis tower, and the minimum reflux pipeline of the poor methanol high-pressure pump are communicated with the analysis towerThe minimum return line of the resolving methanol pump is communicated. By adopting the technical scheme, the utility model can prevent the cold loss caused by the poor methanol high-pressure pump when the minimum reflux valve is opened, and prevent the overproof hydrogen sulfide in the synthesis gas and the forced stop of the methanol synthesis device.
Description
Technical Field
The utility model relates to the field of gas purification, in particular to a low-temperature methanol washing device.
Background
In the chemical production using coal as raw material, the raw synthesis gas contains a large amount of CO2、H2S, and small amounts of acidic gases such as COS, which are detrimental to production, and the sulfides, which can poison the catalyst in downstream production, must be removed and recovered. The low-temperature methanol washing device is a device for removing the acid gases by methanol washing so as to purify the synthesis gas.
In the existing low-temperature methanol washing device, poor methanol regenerated by a regeneration system is sent back to an absorption system for recycling through a poor methanol high-pressure pump, in order to ensure stable operation, the minimum reflux valve of the poor methanol high-pressure pump needs to be opened when the poor methanol high-pressure pump is started and switched, but the minimum reflux pipeline of the poor methanol high-pressure pump directly returns to a hot area of the regeneration system, so that the severe loss of cold energy of a methanol circulation system is caused when a pressure pump is started and switched, the methanol temperature of the absorption system is rapidly increased, the standard exceeding of hydrogen sulfide in synthesis gas is caused, and the gas of a methanol synthesis device is forced to be discharged.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a low-temperature methanol washing device to solve the problems.
In order to achieve the above object, the present invention provides a low-temperature methanol washing apparatus, which includes an absorption tower for absorbing acid gas in syngas, a desorption tower for removing CO in methanol-rich gas from the absorption tower, a thermal regeneration tower and a heat exchanger2The thermal regeneration tower is used for removing H in the methanol-rich liquid from the desorption tower2S, the heat exchanger is used for exchanging heat between the poor methanol in the thermal regeneration tower and the analysis methanol in the analysis tower;
the low-temperature methanol washing device further comprises a poor methanol high-pressure pump used for sending poor methanol after heat exchange to the absorption tower and an analytic methanol pump used for sending analytic methanol of the analytic tower to the thermal regeneration tower, a minimum backflow pipeline of the analytic methanol pump is communicated with the analytic tower, and a minimum backflow pipeline of the poor methanol high-pressure pump is communicated with the minimum backflow pipeline of the analytic methanol pump.
Optionally, the low-temperature methanol washing device comprises a circulation pump for circulating the resolving methanol of the resolving tower between the resolving tower and the heat exchanger.
Optionally, the absorber column comprises CO2Absorption stage and H2S absorption section, said CO2The absorption section is used for absorbing CO in the synthesis gas2、H2And CO, the H2The S absorption section is used for absorbing H in the synthesis gas2S and COS.
Optionally, the low-temperature methanol washing device comprises a medium-pressure flash tower, the medium-pressure flash tower comprises a flash first section and a flash second section which are arranged up and down, and the CO of the absorption tower2Rich methanol in the absorption section is arranged to enter the flash evaporation section for flash evaporation, and H of the absorption tower2Rich methanol in the S absorption section is arranged to enter the flash evaporation second section for flash evaporation, and first-section flash evaporation gas in the medium-pressure flash evaporation tower is arranged to enter the flash evaporation second section and then is evaporated by the H2Rich methanol in the S absorption section absorbs CO in the S absorption section2And the two-stage flash steam of the medium-pressure flash tower is arranged to enter the absorption tower.
Optionally, the stripping methanol pump is configured to also pump the stripping methanol of the stripping column to the flash secondary section.
Optionally, the desorption tower comprises a sulfur-containing methanol flash evaporation section, a methanol-rich flash evaporation section and a gas stripping section which are sequentially arranged from top to bottom, wherein the sulfur-containing methanol flash evaporation section is used for flashing CO in sulfur-containing methanol2The methanol-rich flash evaporation section is used for flashing CO in the methanol-rich2And the desorption methanol in the sulfur-containing methanol flash evaporation section of the desorption tower is set to enter the gas stripping section for gas stripping.
Optionally, the second stage flashed methanol of the medium pressure flash column is arranged to enter the sulphur-containing methanol flash stage for flashing.
Optionally, the low-temperature methanol washing device comprises a first cooler and a second cooler, the first-stage flash methanol of the medium-pressure flash tower is cooled by the first cooler and then divided into two paths, the first path enters the methanol-rich flash section for flash evaporation, the second path enters the sulfur-containing methanol flash section for absorbing H in flash gas after being cooled again by the second cooler2S。
Optionally, the desorption methanol pump is configured to pump the bottom desorption methanol of the desorption tower to the thermal regeneration tower, and the bottom desorption methanol is heated by the second cooler before entering the thermal regeneration tower.
Optionally, the methanol-rich flash section of the stripping column strips methanol configured to be pumped to the absorber column as main wash methanol by a main wash methanol pump.
On one hand, the temperature of the poor methanol in the thermal regeneration tower is reduced by arranging the heat exchanger and utilizing the resolved methanol in the resolving tower; on the other hand, the minimum reflux pipeline of the poor methanol high-pressure pump and the minimum reflux pipeline of the analysis methanol pump are combined before entering the analysis tower and return to the analysis tower at the same time, so that the cold loss caused by the poor methanol high-pressure pump when the minimum reflux valve is opened can be prevented, the standard exceeding of hydrogen sulfide in the synthesis gas is prevented, and the methanol synthesis device is forced to stop.
Additional features and advantages of the utility model will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:
FIG. 1 is a schematic structural diagram of an embodiment of a low-temperature methanol washing apparatus according to the present invention.
Description of the reference numerals
10-medium pressure flash column, 11-CO2Absorption section rich in methanol, 12-H2S absorption section rich methanol, 13-flash first section, 14-flash second section, 15-first section flash gas, 16-second section flash gas, 17-first section flash methanol, 18-second section flash methanol, 20-desorption tower, 21-sulfur-containing methanol flash section, 22-methanol-rich flash section, 23-gas stripping section, 24-CO2The method comprises the following steps of preparing a product gas, 25-sulfur-containing methanol flash evaporation section desorption methanol, 26-rich methanol flash evaporation section desorption methanol, 27-stripping section desorption methanol, 28-tower bottom desorption methanol, 30-a first cooler, 31-a second cooler, 32-a desorption methanol pump, 33-a minimum reflux pipeline of the desorption methanol pump, 34-a main methanol washing pump, 35-a circulating pump, 36-a heat exchanger, 37-a poor methanol high-pressure pump, 38-a minimum reflux pipeline of the poor methanol high-pressure pump, and 39-poor methanol of a thermal regeneration tower.
Detailed Description
The following detailed description of embodiments of the utility model refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the present invention, unless otherwise specified, use of the terms "upper, lower, top, and bottom" generally refer to the orientation as shown in the drawings.
The utility model provides a low-temperature methanol washing device, which comprises an absorption tower, an absorption tower 20, a heat regeneration tower and a heat exchanger 36, wherein the absorption tower is used for absorbing acid gas in synthesis gas, and the absorption tower 20 is used for removing CO in methanol-rich gas from the absorption tower2The thermal regeneration tower is used for removing the rich methanol from the desorption tower 20H of (A) to (B)2S, the heat exchanger 36 is used for exchanging heat between the lean methanol 39 in the thermal regeneration tower and the desorption methanol in the desorption tower 20 (i.e. the desorption methanol in the desorption tower 20 is cooled to the lean methanol 39 in the thermal regeneration tower); the low-temperature methanol washing device further comprises a poor methanol high-pressure pump 37 used for sending poor methanol after heat exchange to the absorption tower and a desorption methanol pump 32 used for sending desorption methanol in the desorption tower 20 to the thermal regeneration tower, wherein the minimum reflux pipeline of the desorption methanol pump 32 is communicated with the desorption tower 20, and the minimum reflux pipeline of the poor methanol high-pressure pump 37 is communicated with the minimum reflux pipeline of the desorption methanol pump 32.
From the above, it can be understood that the minimum return line 33 of the resolving methanol pump is connected between the vicinity of the outlet of the resolving methanol pump 32 and the resolving tower 20, and the minimum return line 38 of the methanol-poor high-pressure pump is connected between the vicinity of the outlet of the methanol-poor high-pressure pump 37 and the minimum return line 33 of the resolving methanol pump, so that when the minimum return valve of the methanol-poor high-pressure pump 37 is opened, the cold methanol-poor in the minimum return line 38 of the methanol-poor high-pressure pump can be returned to the resolving tower 20 through the minimum return line 33 of the resolving methanol pump, and the minimum return line 33 of the resolving methanol pump and the resolving tower 20 are both cold areas, and no loss of cooling capacity is caused.
On one hand, the temperature of the poor methanol 39 of the thermal regeneration tower is reduced by arranging the heat exchanger 36 and utilizing the analysis methanol of the analysis tower 20; on the other hand, the minimum reflux pipeline 38 of the poor methanol high-pressure pump and the minimum reflux pipeline 33 of the analysis methanol pump are combined before entering the analysis tower and are simultaneously returned to the analysis tower 20, so that the cold loss caused by the poor methanol high-pressure pump 37 when the minimum reflux valve is opened can be prevented, the hydrogen sulfide in the synthesis gas exceeds the standard, and the methanol synthesis device is forced to stop.
In the present invention, the absorption column may comprise CO2Absorption stage and H2S absorption section, said CO2The absorption section is used for absorbing CO in the synthesis gas2、H2And CO, the H2The S absorption section is used for absorbing H in the synthesis gas2S and COS. As shown in FIG. 1, the low-temperature methanol washing device may comprise a medium-pressure flash tower 10, wherein the medium-pressure flash tower 10 comprises a flash first section 13 and a flash second section 14 which are arranged up and down。
Further, as shown in FIG. 1, CO of the absorption tower2The methanol-rich 11 in the absorption section can enter a flash section 13 of a medium-pressure flash tower 10 for flash evaporation, and H in the absorption tower2The rich methanol 12 in the S absorption section can enter a flash evaporation second section 14 of the medium-pressure flash tower 10 for flash evaporation; first stage flash gas 15 (comprising CO) from medium pressure flash column 102、H2And CO) can enter the flash evaporation second section 14 to absorb CO in the methanol by the desorption methanol in the desorption tower 20 as reabsorption methanol2Second stage flash gas 16 (comprising CO) from medium pressure flash column 102、 H2CO and H2S) can enter the absorption tower to be absorbed again.
In the above, the two-stage flash gas 16 is treated before entering the absorption tower, and for example, returned to the synthesis gas after being subjected to heat exchange, temperature rise, gas-liquid separation, and compression in this order.
In the present invention, as shown in fig. 1, the desorption tower 20 may include a sulfur-containing methanol flash evaporation section 21, a methanol-rich flash evaporation section 22 and a stripping section 23, which are sequentially arranged from top to bottom, wherein the sulfur-containing methanol flash evaporation section 21 is used for flashing CO in sulfur-containing methanol2The methanol-rich flash section 22 is used for flashing CO in the methanol-rich2The stripping section 23 is used for stripping CO2. The low-temperature methanol washing device also comprises a first cooler 30 and a second cooler 31, wherein the first-stage flash methanol 17 of the medium-pressure flash tower 10 can be divided into two paths after being cooled by the first cooler 30, the first path enters the methanol-rich flash section 22 of the desorption tower 20 for flash evaporation, and the second path enters the sulfur-containing methanol flash section 21 of the desorption tower 20 for absorbing H in flash evaporation gas after being cooled again by the second cooler 312S; the second-stage flashed methanol 18 of the medium-pressure flash column 10 can enter a sulfur-containing methanol flash section 21 of a stripper column 20 for flashing.
In the above, the desorbed methanol 25 in the sulfur-containing methanol flash section of the desorption tower 20 can enter the stripping section 23 for stripping so as to strip out the residual CO2. The methanol-rich flash section of the stripper column 20, the stripper methanol 26, may be pumped by a main wash methanol pump 34 to the absorber column for use as main wash methanol. The tail gas generated by the desorption tower 20 can be discharged from the top of the stripping section 23, and the discharged tail gas can be processed in a nitrogen coolerThe refrigerant deep cooler exchanges heat to about 20 ℃ and then enters the tail gas washing tower. The flash gas of the sulfur-containing methanol flash section 21 of the desorption tower 20 can be re-washed and absorbed by the reabsorption methanol at the top of the desorption tower, and 98.852% of CO is discharged from the top of the desorption tower after washing2Product gas 24.
In addition, the low-temperature methanol washing apparatus may further include a circulation pump 35 for circulating the desorption methanol in the desorption tower 20 between the desorption tower 20 and the heat exchanger 36. Specifically, as shown in fig. 1, stripping methanol 27 in the stripping section of the desorption tower 20 is sent to a heat exchanger 36 through a circulating pump 35 to exchange heat with lean methanol 39 in the thermal regeneration tower, and then enters the bottom of the desorption tower 20.
In the present invention, as shown in fig. 1, the stripping methanol pump 32 divides the stripping methanol 28 at the bottom of the stripping tower 20 into two paths, one path is sent to the flash second stage 14 of the medium pressure flash tower 10 (for washing CO in flash gas)2、H2S), the other is sent to the thermal regeneration column, and the bottom resolved methanol 28 can be heated by a second cooler 31 before entering the thermal regeneration column.
In the present invention, CO desorbed from the desorption tower 202The product gas 24 may be heated and then compressed by a carbon dioxide compressor for ease of use.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the utility model. The utility model is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. A low-temperature methanol washing device, which is characterized in that,
the low-temperature methanol washing device comprises an absorption tower, a desorption tower (20), a thermal regeneration tower and a heat exchanger (36), wherein the absorption tower is used for absorbing acid gas in the synthesis gas, and the desorption tower (20) is used for removing CO in the methanol-rich gas from the absorption tower2The thermal regeneration tower is used for removing H in the methanol-rich liquid from the desorption tower (20)2S, the heat exchanger (36) is used for exchanging heat between the lean methanol (39) of the thermal regeneration tower and the desorption methanol of the desorption tower (20);
the low-temperature methanol washing device further comprises a poor methanol high-pressure pump (37) for sending poor methanol after heat exchange to the absorption tower and a resolving methanol pump (32) for sending resolving methanol of the resolving tower (20) to the thermal regeneration tower, wherein a minimum reflux pipeline of the resolving methanol pump (32) is communicated with the resolving tower (20), and a minimum reflux pipeline of the poor methanol high-pressure pump (37) is communicated with a minimum reflux pipeline of the resolving methanol pump (32).
2. A low temperature methanol wash as claimed in claim 1, characterized in that it comprises a circulation pump (35) for circulating the stripping methanol of the stripping column (20) between the stripping column (20) and the heat exchanger (36).
3. The cryogenic methanol wash apparatus of claim 1, wherein the absorber column comprises CO2Absorption stage and H2S absorption section, said CO2The absorption section is used for absorbing CO in the synthesis gas2、H2And CO, the H2The S absorption section is used for absorbing H in the synthesis gas2S and COS.
4. A low temperature methanol washing apparatus according to claim 3, characterized in that the low temperature methanol washing apparatus comprises a medium pressure flash column (10), the medium pressure flash column (10) comprising a flash first stage (13) and a flash second stage (14) arranged one above the other, wherebyCO of the absorption tower2The methanol-rich (11) in the absorption section is arranged to enter the flash evaporation section (13) for flash evaporation, and H in the absorption tower2Rich methanol (12) in the S absorption section is arranged to enter the flash evaporation second section (14) for flash evaporation, and first flash evaporation gas (15) in the medium-pressure flash evaporation tower (10) is arranged to enter the flash evaporation second section (14) and then is treated by the H2The S absorption section rich methanol (12) absorbs CO in the S absorption section rich methanol2A second stage flash gas (16) of the medium pressure flash column (10) is arranged to enter the absorber column.
5. A low temperature methanol wash apparatus according to claim 4, characterized in that the stripping methanol pump (32) is arranged to be able to pump also stripping methanol of the stripping column (20) to the flash section (14).
6. The low-temperature methanol washing device according to claim 4, wherein the desorption tower (20) comprises a sulfur-containing methanol flash section (21), a methanol-rich flash section (22) and a gas stripping section (23) which are arranged from top to bottom in sequence, and the sulfur-containing methanol flash section (21) is used for flashing CO in sulfur-containing methanol2The methanol-rich flash section (22) is used for flashing CO in the methanol-rich2And the desorption methanol (25) in the sulfur-containing methanol flash section of the desorption tower (20) is arranged to enter the gas stripping section (23) for gas stripping.
7. A low temperature methanol washing plant according to claim 6, characterized in that the second stage flashed methanol (18) of the medium pressure flash column (10) is arranged to enter the sulphur containing methanol flash stage (21) for flashing.
8. The low-temperature methanol washing device according to claim 6, characterized in that the low-temperature methanol washing device comprises a first cooler (30) and a second cooler (31), wherein the first part of flash methanol (17) of the medium-pressure flash tower (10) is cooled by the first cooler (30) and then divided into two paths, the first path enters the methanol-rich flash section (22) for flash evaporation, and the second path enters the sulfur-containing methanol flash section (21) for absorbing H in flash gas after being cooled again by the second cooler (31)2S。
9. A low temperature methanol wash according to claim 8, characterized in that the stripping methanol pump (32) is arranged to pump bottom stripping methanol (28) of the stripping column (20) to the thermal regeneration column, which bottom stripping methanol (28) is heated by the second cooler (31) before entering the thermal regeneration column.
10. A low temperature methanol wash plant according to claim 6, characterized in that the methanol-rich flash section of the stripper column (20) stripping methanol (26) is arranged to be pumped to the absorption column as main wash methanol by a main wash methanol pump (34).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120267839.7U CN215712845U (en) | 2021-01-27 | 2021-01-27 | Low-temperature methanol washing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120267839.7U CN215712845U (en) | 2021-01-27 | 2021-01-27 | Low-temperature methanol washing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215712845U true CN215712845U (en) | 2022-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120267839.7U Active CN215712845U (en) | 2021-01-27 | 2021-01-27 | Low-temperature methanol washing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215712845U (en) |
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2021
- 2021-01-27 CN CN202120267839.7U patent/CN215712845U/en active Active
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