CN204873835U - Carbon dioxide's device among desorption nitrous oxide - Google Patents
Carbon dioxide's device among desorption nitrous oxide Download PDFInfo
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- CN204873835U CN204873835U CN201520632432.4U CN201520632432U CN204873835U CN 204873835 U CN204873835 U CN 204873835U CN 201520632432 U CN201520632432 U CN 201520632432U CN 204873835 U CN204873835 U CN 204873835U
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- adsorption tower
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- nitrous oxide
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2
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Abstract
The utility model belongs to the chemical industry field specifically is a carbon dioxide's device among desorption nitrous oxide. The device includes heat exchanger (1), adsorption tower (2), heat exchanger two (3) and vacuum pump (4), the air inlet of feed gas passes through heat exchanger (1) and the valve is connected with adsorption tower (2), the rethread valve is connected with clean air out, the regeneration gas air inlet passes through heat exchanger two (3) and the valve is connected with adsorption tower (2), adsorption tower (2) are through valve and contrary gassing exit linkage, adsorption tower (2) are connected with regeneration exhaust outlet through valve and vacuum pump (4). The utility model discloses in need not to use alkali lye, do not produce solid waste, energy -concerving and environment -protective, the feed gas need not to pressurize, but greatly reduced equipment investment and operation energy consumption, carbon dioxide desorption precision is high in the purified gas, and the nitrous oxide rate of recovery is high.
Description
Technical field
The invention belongs to chemical field, relate to recovery and the purification technique of Nitrous Oxide in chemical field, be specially a kind of device removing carbonic acid gas in Nitrous Oxide.
Background technology
Nitrous Oxide (N
2o) be commonly called as laughing gas, chemical name is nitrous oxide.The sub-nitrogen of high-purity mangesium oxide is the important basic material of modern photoelectron, microelectronics, large-scale unicircuit, optical fiber fabrication arts, direct impact is had on the quality of semiconductor photoelectric device, be irreplaceable critical electronic gas, be mainly used in chemical vapor deposition method in electronic industry.
The classical way obtaining Nitrous Oxide is by decomposing ammonium nitrate, also can reclaim from the by-product tail gas producing nitric acid and hexanodioic acid and purify simultaneously.The global warming potential of Nitrous Oxide is CO
2298 times, its life-span in an atmosphere reaches 114 years, is a kind of greenhouse gases very with threat.So, reclaim and purification Nitrous Oxide from tail gas, not only greatly can reduce the cost of unstripped gas, also meet the energy-saving and emission-reduction policy of country simultaneously, thus become study hotspot in recent years.
The by-product tail gas of nitric acid and hexanodioic acid, its pressure is general all lower, and general gauge pressure is less than 0.3MPa.In nitric acid and hexanodioic acid tail gas, its main component is Nitrous Oxide and nitrogen, in addition containing CO
2, O
2and the impurity such as water.Reclaim and purification Nitrous Oxide from tail gas, must by CO wherein
2deng impurity removal, due to N
2o and CO
2molecular weight identical, molecular dimension is very close, boiling-point difference heteropole is little, therefore how to remove the carbonic acid gas in Nitrous Oxide, is to reclaim and the technological difficulties of purification Nitrous Oxide from tail gas.
Remove the carbonic acid gas in Nitrous Oxide, mainly contain two class methods at present, one is alkali absorption method, and another kind is adsorption method of separation.Due to CO in nitric acid and hexanodioic acid tail gas
2content is higher, and volume content is generally greater than 4%, uses alkali absorption method to remove CO
2time, alkali lye consumption is very large, and can produce solid waste, is difficult to process.The subject matter of adsorption method of separation is, on existing sorbent material, and N
2o and CO
2separation factor less, be difficult to obtain CO
2remove precision high, N
2the purified gas that the O rate of recovery is also high.
CN104229760A discloses recovery and the purification process of nitrous oxide, and the method is by adsorption unit carbon dioxide removal, and sorbent material is based on molecular sieve sorbent material.But the method need use double-stage compressor, and unstripped gas is forced into 2.0MPa-5.0MPa, adsorb at 0 DEG C, facility investment and operation energy consumption are all higher, and the N of the method
2the O rate of recovery is also lower.
CN104140085A discloses the apparatus and method of water and carbonic acid gas in a kind of deep removal Nitrous Oxide, the method is also use molecular sieve sorbent material, unstripped gas need be forced into 2.0MPa-4.0MPa, facility investment and operation energy consumption are all higher, and the method does not illustrate gained N
2the rate of recovery of O.
Summary of the invention
For above-mentioned the deficiencies in the prior art, the invention provides a kind of device removing carbonic acid gas in Nitrous Oxide, this device without the need to pressurizeing to unstripped gas, facility investment and operation energy consumption low, the precision of carbon dioxide removal is high, and the Nitrous Oxide rate of recovery is high.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A kind of device removing carbonic acid gas in Nitrous Oxide, this device has three kinds of mode of connection, the device of first kind of way comprises interchanger one, adsorption tower, vacuum pump and interchanger two, the inlet mouth of unstripped gas passes through to be connected with clean gas outlet by valve after interchanger one is connected with adsorption tower with valve again, resurgent gases inlet mouth is connected with adsorption tower with valve by interchanger two, adsorption tower is connected with inverse bleeder holes by valve, and adsorption tower to be exported with regeneration off gases by valve and vacuum pump and is connected.All sorbent material is filled with in adsorption tower.The quantity of adsorption tower all can be 2-10.Parallel connectivity is between each adsorption tower.Namely such as adsorption tower is 2, namely remove the device of carbonic acid gas in Nitrous Oxide and comprise interchanger one, two adsorption tower, vacuum pump and interchanger two, be connected in parallel between two adsorption towers, the inlet mouth of unstripped gas passes through to be connected with clean gas outlet by valve after interchanger one is connected with two adsorption towers respectively with valve again, resurgent gases inlet mouth is connected with two adsorption towers with valve respectively by interchanger two, these two adsorption towers are connected with inverse bleeder holes by valve, and two adsorption towers to be exported with regeneration off gases by valve and vacuum pump and are connected.
The second way of this device is: a kind ofly remove the device of carbonic acid gas in Nitrous Oxide and comprise interchanger one, adsorption tower and vacuum pump, the inlet mouth of unstripped gas is connected with adsorption tower with valve by interchanger one, be connected with clean gas outlet by valve again, adsorption tower is connected with inverse bleeder holes by valve, and adsorption tower to be exported with regeneration off gases by valve and vacuum pump and is connected.All sorbent material is filled with in adsorption tower.The quantity of adsorption tower all can be 2-10.Parallel connectivity is between each adsorption tower.Such as adsorption tower is three, namely remove the device of carbonic acid gas in Nitrous Oxide and comprise interchanger one, three adsorption towers and vacuum pumps, for being connected in parallel between three adsorption towers, the inlet mouth of unstripped gas is connected with three adsorption towers with valve respectively by interchanger one, three adsorption towers are connected with clean gas outlet by valve again, and three adsorption towers are all connected with inverse bleeder holes by valve, three adsorption towers all to be exported with regeneration off gases by valve and vacuum pump and are connected
The third mode of this device is: a kind ofly remove the device of carbonic acid gas in Nitrous Oxide and comprise interchanger one, adsorption tower and interchanger two, the inlet mouth of unstripped gas is connected with adsorption tower with valve by interchanger one, be connected with clean gas outlet by valve again, resurgent gases inlet mouth is connected with adsorption tower with valve by interchanger two, adsorption tower is connected with inverse bleeder holes by valve, and adsorption tower to be exported with regeneration off gases by valve and is connected.All sorbent material is filled with in described adsorption tower.The quantity of adsorption tower all can be 2-10.Parallel connectivity is between each adsorption tower.Such as adsorption tower is three, namely remove the device of carbonic acid gas in Nitrous Oxide and comprise interchanger one, three adsorption towers and interchanger two, be coordination between three adsorption towers, the inlet mouth of unstripped gas is connected with three adsorption towers with valve respectively by interchanger one, three adsorption towers are connected with clean gas outlet by valve again, resurgent gases inlet mouth is connected with three adsorption towers with valve respectively by interchanger two, and three adsorption towers are connected with inverse bleeder holes by valve, three adsorption towers all to be exported with regeneration off gases by valve and are connected.
Use adsorption method of separation to be separated mixed gas, the effect of separation directly by the impact of separation factor, and is exactly process conditions on one of larger factor of separation factor impact.For this field of carbon dioxide removal from Nitrous Oxide, conventional high pressure, normal temperature suction type, be unfavorable for improving separation factor.The suction type that the utility model adopts low pressure, suitably heats up, can significantly improve the separating effect of carbon dioxide removal from Nitrous Oxide.
The gas mixture of nitrous oxide-containing and carbonic acid gas, without the need to through overdraft, interchanger is entered be less than the low pressure of 1MPa in gauge pressure under, after interchanger is warming up to 40-120 DEG C, enter the adsorption tower being filled with solids mixing sorbent material, carbonic acid gas etc. easily absorbed component are attracted on sorbent material, and all the other gases being rich in Nitrous Oxide flow out from adsorption tower as purified gas.The mode of finding time and/or rinsing is used to regenerate sorbent material, purge gas can be a small amount of purified gas, also other rare gas elementes such as pure nitrogen, helium, argon gas can be selected, purge gas enters before adsorption tower regenerates, need first to be warming up to 40-120 DEG C through interchanger, to improve the effect of rinsing regeneration.
Use this to remove the device of carbonic acid gas in Nitrous Oxide, the carbon dioxide content in gained purified gas, in volume content, be less than 50ppm, the yield of Nitrous Oxide is greater than 80%.
Positively effect of the present invention is embodied in:
(1), without the need to using alkali lye, solid waste is not produced, energy-conserving and environment-protective;
(2), unstripped gas pressurizes without the need to compressor, can greatly reduce facility investment and operation energy consumption;
(3), in purified gas CO2 removal precision is high, and the Nitrous Oxide rate of recovery is high.
Accompanying drawing explanation
Fig. 1 is the device schematic diagram described in the utility model embodiment 1.
Fig. 2 is the device schematic diagram described in the utility model embodiment 2.
Fig. 3 is the device schematic diagram described in the utility model embodiment 3.
Fig. 4 is the device schematic diagram described in the utility model embodiment 4.
Wherein, 1---interchanger one, 2---adsorption tower, 3---interchanger two, 4---vacuum pump.
Embodiment
Below by way of the embodiment of embodiment, the present invention is further detailed explanation.But this should be interpreted as that the scope of the above-mentioned theme of the present invention is only limitted to following embodiment.Without departing from the idea case in the present invention described above, the various replacement made according to ordinary skill knowledge and customary means or change, include within the scope of the invention.
Embodiment 1:
Remove a device for carbonic acid gas in Nitrous Oxide, this device comprises interchanger one, two adsorption towers, i.e. first adsorption tower and second adsorption tower, interchanger two and vacuum pump.The inlet mouth of unstripped gas is connected with two adsorption towers with valve by interchanger one, be connected with clean gas outlet by valve again, resurgent gases inlet mouth is connected with two adsorption towers with valve by interchanger two, two adsorption towers are all connected with inverse bleeder holes by valve, and two adsorption towers all to be exported with regeneration off gases by valve and vacuum pump and are connected.
The gas mixture of nitrous oxide-containing and carbonic acid gas, its pressure (gauge pressure) is 0.2MPa, and temperature is 20 DEG C, consists of (V%): N
2: 43.9%, N
2o:47.2%, CO
2: 4.5%, O
2: 3.6%, H
2o:0.8%.After interchanger one heats up, the temperature of gas mixture is elevated to 60 DEG C, enters the adsorption tower being filled with solids mixing sorbent material, and carbonic acid gas etc. easily absorbed component are attracted on sorbent material, remaining gas flows out from adsorption tower as purified gas, purified gas consists of (V%): N
2: 49.6%, N
2o:46.4%, CO
2: 10ppm, O
2: 4.0%, H
2o:5ppm.Use the mode of finding time simultaneously to rinse to regenerate sorbent material, resurgent gases is after interchanger two heats up, and the temperature of resurgent gases is elevated to 60 DEG C.
1000Nm
3gas mixture is after the device purification that this kind removes carbonic acid gas in Nitrous Oxide, and purified gas volume is 823.5Nm
3, N
2o yield is 81%.
Embodiment 2:
Remove a device for carbonic acid gas in Nitrous Oxide, this device comprises interchanger one, vacuum pump and four adsorption towers, i.e. a first, second, third and fourth adsorption tower.The inlet mouth of unstripped gas is connected with four adsorption towers with valve by interchanger one, be connected with clean gas outlet by valve again, four adsorption towers are all connected with inverse bleeder holes by valve, and four adsorption towers all to be exported with regeneration off gases by valve and vacuum pump and are connected.
The gas mixture of nitrous oxide-containing and carbonic acid gas, its pressure (gauge pressure) is 0.7MPa, and temperature is 20 DEG C, consists of (V%): N
2: 36.5%, N
2o:61.0%, CO
2: 2.5%.After interchanger one heats up, the temperature of gas mixture is elevated to 100 DEG C, enters the adsorption tower being filled with solids mixing sorbent material, and carbonic acid gas etc. easily absorbed component are attracted on sorbent material, remaining gas flows out from adsorption tower as purified gas, purified gas consists of (V%): N
2: 40.4%, N
2o:59.6%, CO
2: 50ppm.The mode of finding time is used to regenerate sorbent material.
100Nm
3gas mixture is after the device purification that this kind removes carbonic acid gas in Nitrous Oxide, and purified gas volume is 83.97Nm
3, N
2o yield is 82%.
Embodiment 3:
Remove a device for carbonic acid gas in Nitrous Oxide, this device comprises interchanger one, interchanger two and two adsorption towers, i.e. the first adsorption tower and the second adsorption tower.The inlet mouth of unstripped gas is connected with two adsorption towers with valve by interchanger one, be connected with clean gas outlet by valve again, resurgent gases inlet mouth is connected with two adsorption towers with valve by interchanger two, two adsorption towers are all connected with inverse bleeder holes by valve, and two adsorption towers to be exported with regeneration off gases by valve and are connected.
The gas mixture of nitrous oxide-containing and carbonic acid gas, its pressure (gauge pressure) is 0.3MPa, and temperature is 20 DEG C, consists of (V%): N
2: 62.5%, N
2o:25.2%, CO
2: 10.2%, O
2: 2.1%.After interchanger one heats up, the temperature of gas mixture is elevated to 80 DEG C, enters the adsorption tower being filled with solids mixing sorbent material, and carbonic acid gas etc. easily absorbed component are attracted on sorbent material, remaining gas flows out from adsorption tower as purified gas, purified gas consists of (V%): N
2: 71.7%, N
2o:25.9%, CO
2: 50ppm, O
2: 2.4%.Use the mode of rinsing to regenerate sorbent material, resurgent gases is after interchanger two heats up, and the temperature of resurgent gases is elevated to 110 DEG C.
500Nm
3gas mixture is after the device purification that this kind removes carbonic acid gas in Nitrous Oxide, and purified gas volume is 414.0Nm
3, N
2o yield is 85%.
Embodiment 4:
Remove a device for carbonic acid gas in Nitrous Oxide, this device comprises interchanger one, six adsorption towers, i.e. the first, second, third, fourth, the 5th and the 6th adsorption tower, interchanger two and vacuum pump.The inlet mouth of unstripped gas is connected with six adsorption towers with valve by interchanger one, be connected with clean gas outlet by valve again, resurgent gases inlet mouth is connected with six adsorption towers with valve by interchanger two, six adsorption towers are all connected with inverse bleeder holes by valve, and six adsorption towers all to be exported with regeneration off gases by valve and vacuum pump and are connected.
The gas mixture of nitrous oxide-containing and carbonic acid gas, its pressure (gauge pressure) is 0.5MPa, and temperature is 20 DEG C, consists of (V%): N
2: 43.9%, N
2o:47.2%, CO
2: 4.5%, O
2: 3.6%, H
2o:0.8%.After interchanger one heats up, the temperature of gas mixture is elevated to 80 DEG C, enters the adsorption tower being filled with solids mixing sorbent material, and carbonic acid gas etc. easily absorbed component are attracted on sorbent material, remaining gas flows out from adsorption tower as purified gas, purified gas consists of (V%): N
2: 49.2%, N
2o:46.8%, CO
2: 10ppm, O
2: 4.0%, H
2o:5ppm.Use the mode of finding time simultaneously to rinse to regenerate sorbent material, resurgent gases is after interchanger two heats up, and the temperature of resurgent gases is elevated to 80 DEG C.
2000Nm
3gas mixture is after the device purification that this kind removes carbonic acid gas in Nitrous Oxide, and purified gas volume is 1694.2Nm
3, N
2o yield is 84%.
Claims (6)
1. one kind removes the device of carbonic acid gas in Nitrous Oxide, this device comprises interchanger one (1), adsorption tower (2), interchanger two (3) and vacuum pump (4), it is characterized in that: the inlet mouth of unstripped gas is connected with adsorption tower (2) with valve by interchanger one (1), be connected with clean gas outlet by valve again, resurgent gases inlet mouth is connected with adsorption tower (2) with valve by interchanger two (3), adsorption tower (2) is connected with inverse bleeder holes by valve, and adsorption tower (2) to be exported with regeneration off gases by valve and vacuum pump (4) and is connected.
2. one kind removes the device of carbonic acid gas in Nitrous Oxide, this device comprises interchanger one (1), adsorption tower (2) and vacuum pump (4), it is characterized in that: the inlet mouth of unstripped gas is connected with adsorption tower (2) with valve by interchanger one (1), be connected with clean gas outlet by valve again, adsorption tower (2) is connected with inverse bleeder holes by valve, and adsorption tower (2) to be exported with regeneration off gases by valve and vacuum pump (4) and is connected.
3. one kind removes the device of carbonic acid gas in Nitrous Oxide, this device comprises interchanger one (1), adsorption tower (2) and interchanger two (3), it is characterized in that: the inlet mouth of unstripped gas is connected with adsorption tower (2) with valve by interchanger one (1), be connected with clean gas outlet by valve again, resurgent gases inlet mouth is connected with adsorption tower (2) with valve by interchanger two (3), adsorption tower (2) is connected with inverse bleeder holes by valve, and adsorption tower (2) to be exported with regeneration off gases by valve and is connected.
4. according to the device removing carbonic acid gas in Nitrous Oxide in claim 1-3 described in any one claim, it is characterized in that: the quantity of described adsorption tower (2) is 2-10.
5. according to the device removing carbonic acid gas in Nitrous Oxide described in claim 4, it is characterized in that: for being connected in parallel between each adsorption tower.
6. according to the device removing carbonic acid gas in Nitrous Oxide described in claim 4, it is characterized in that: in described adsorption tower (2), be all filled with solids mixing sorbent material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520632432.4U CN204873835U (en) | 2015-08-21 | 2015-08-21 | Carbon dioxide's device among desorption nitrous oxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520632432.4U CN204873835U (en) | 2015-08-21 | 2015-08-21 | Carbon dioxide's device among desorption nitrous oxide |
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| Publication Number | Publication Date |
|---|---|
| CN204873835U true CN204873835U (en) | 2015-12-16 |
Family
ID=54818234
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520632432.4U Active CN204873835U (en) | 2015-08-21 | 2015-08-21 | Carbon dioxide's device among desorption nitrous oxide |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106731497A (en) * | 2016-12-20 | 2017-05-31 | 杨刘月 | A kind of nitric acid industry tail gas extracts N except carbon2The purification devices and process of O |
| CN111111376A (en) * | 2018-10-31 | 2020-05-08 | 乔治洛德方法研究和开发液化空气有限公司 | Adsorption tower device and air separation device provided with same |
-
2015
- 2015-08-21 CN CN201520632432.4U patent/CN204873835U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106731497A (en) * | 2016-12-20 | 2017-05-31 | 杨刘月 | A kind of nitric acid industry tail gas extracts N except carbon2The purification devices and process of O |
| CN106731497B (en) * | 2016-12-20 | 2023-12-08 | 杨刘月 | Decarbonizing and extracting N from nitric acid industrial tail gas 2 O purification device and process method |
| CN111111376A (en) * | 2018-10-31 | 2020-05-08 | 乔治洛德方法研究和开发液化空气有限公司 | Adsorption tower device and air separation device provided with same |
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Address after: No. 5 high tech Zone Gaopeng road in Chengdu city of Sichuan Province in 610041 Patentee after: Haohua Chemical Technology Group Co., Ltd. Address before: No. 5 high tech Zone Gaopeng road in Chengdu city of Sichuan Province in 610041 Patentee before: Tianyi Science and Technology Co., Ltd., Sichuan Prov |
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| CP01 | Change in the name or title of a patent holder | ||
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Effective date of registration: 20200610 Address after: No. 5 high tech Zone Gaopeng road in Chengdu city of Sichuan Province in 610041 Patentee after: SOUTHWEST RESEARCH & DESIGN INSTITUTE OF CHEMICAL INDUSTRY Address before: No. 5 high tech Zone Gaopeng road in Chengdu city of Sichuan Province in 610041 Patentee before: Haohua Chemical Technology Group Co.,Ltd. |
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