GB1580367A - Chemical plant - Google Patents
Chemical plant Download PDFInfo
- Publication number
- GB1580367A GB1580367A GB14917/77A GB1491777A GB1580367A GB 1580367 A GB1580367 A GB 1580367A GB 14917/77 A GB14917/77 A GB 14917/77A GB 1491777 A GB1491777 A GB 1491777A GB 1580367 A GB1580367 A GB 1580367A
- Authority
- GB
- United Kingdom
- Prior art keywords
- plant
- atmosphere
- heat exchangers
- condensation
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000126 substance Substances 0.000 title description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 54
- 239000007789 gas Substances 0.000 claims description 30
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 27
- 239000001569 carbon dioxide Substances 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 26
- 238000001704 evaporation Methods 0.000 claims description 24
- 238000009833 condensation Methods 0.000 claims description 23
- 230000005494 condensation Effects 0.000 claims description 23
- 230000008020 evaporation Effects 0.000 claims description 21
- 239000003758 nuclear fuel Substances 0.000 claims description 19
- 238000009835 boiling Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 238000010926 purge Methods 0.000 claims description 6
- 239000003507 refrigerant Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims description 4
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 4
- 229910052740 iodine Inorganic materials 0.000 claims description 4
- 239000011630 iodine Substances 0.000 claims description 4
- 229910052743 krypton Inorganic materials 0.000 claims description 4
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000012857 radioactive material Substances 0.000 claims description 4
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims description 4
- 229960000909 sulfur hexafluoride Drugs 0.000 claims description 4
- 229910052724 xenon Inorganic materials 0.000 claims description 4
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 4
- 238000005202 decontamination Methods 0.000 claims description 2
- 230000003588 decontaminative effect Effects 0.000 claims description 2
- 230000008021 deposition Effects 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 claims description 2
- 239000011236 particulate material Substances 0.000 claims description 2
- 239000012530 fluid Substances 0.000 description 12
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 6
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 4
- 230000004992 fission Effects 0.000 description 4
- 229910052778 Plutonium Inorganic materials 0.000 description 3
- 239000000356 contaminant Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- OYEHPCDNVJXUIW-UHFFFAOYSA-N plutonium atom Chemical compound [Pu] OYEHPCDNVJXUIW-UHFFFAOYSA-N 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 229910052770 Uranium Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 238000012958 reprocessing Methods 0.000 description 2
- 238000000638 solvent extraction Methods 0.000 description 2
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- RWRIWBAIICGTTQ-UHFFFAOYSA-N difluoromethane Chemical compound FCF RWRIWBAIICGTTQ-UHFFFAOYSA-N 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- ZCYVEMRRCGMTRW-NJFSPNSNSA-N iodine-129 atom Chemical compound [129I] ZCYVEMRRCGMTRW-NJFSPNSNSA-N 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F7/00—Shielded cells or rooms
- G21F7/015—Room atmosphere, temperature or pressure control devices
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/42—Reprocessing of irradiated fuel
- G21C19/44—Reprocessing of irradiated fuel of irradiated solid fuel
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/02—Treating gases
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Plasma & Fusion (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Treating Waste Gases (AREA)
- Tunnel Furnaces (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Description
(54) IMPROVEMENTS IN OR RELATING TO
CHEMICAL PLANT
(71) We, UNITED KINGDOM ATOMIC ENERGY AUTHORITY,
London, a British Authority, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to chemical plant and processes and particularly to plant and processes in which the atmosphere is contained and continuously circulated in a closed circuit. Such a plant may be used for processes in which egress of the atmosphere from the plant has to be avoided as is the case in a plant in which nuclear fuel is treated such as a plant in which irradiated nuclear fuels are reprocessed or in which plutonium.containing fuels are fabricated.
According to a first aspect of the present invention a plant in which the atmosphere is contained and continuously circulated in a closed circuit has means whereby circulation of the atmosphere is effected by the driving force obtained from the condensation of at least part of the atmosphere circulating in the plant in a first heat exchanger and the subsequent evaporation of the condensed atmosphere from said first heat exchanger, the plant also having a further heat exchanger in which evaporation of condensed atmosphere occurs when condensation is occurring in the first heat exchanger and condensation of at least part of the atmosphere occurs when evaporation is occurring in the first heat exchanger, the first and further heat exchangers being used alternately to provide a continuous driving force to effect circulation of the atmosphere.
According to a second aspect of the present invention a process in which the atmosphere under which the process is performed is contained in a plant and continuously circulated in a closed circuit includes the steps of alternately condensing and evaporating at least a part of the atmosphere circulating in the plant in each of a pair of heat exchangers, one of said pair of heat exchangers being used to condense said part of the atmosphere whilst the other of said pair of heat exchangers is used to evaporate to provide a continuous driving force to effect circulation of the atmosphere around the plant.
The alternate use of two heat exchangers provides the driving force for circulating the atmosphere within the plant and the use of a pump or fan for moving the atmosphere around the plant can be avoided.
The atmosphere in the plant may consist essentially of a gas which has a boiling point above -100"C. Gases which sublime at temperatures above -100 C such as carbon dioxide and sulphur hexafluoride are particularly suitable. Other suitable gases include fluorocarbons having a boiling point above -100"C. Table I lists several suitable gases and their boiling points.
TABLE 1
boiling pt. ("C) boiling pt. ("C) CO2 -78.5 (sublimes) C C12 F2 -29.8 SFs -63.9 (sublimes) C Br F3 -57.8
CH3F -78.5 CF3-CF3 -47.6
CH2F2 -51.7 CHF2-CF3 -48.5 CHEF, -82 C Cl F2-CF3 -38.7 CHCl F2 -40.8 CF3-CF2-CF3 -36.7 C Cl F3 -81.4
The present invention finds one application in plant and processes for the reprocessing of irradiated nuclear fuel. In one known process for the reprocessing of irradiated nuclear fuel the irradiated nuclear fuel material is first dissolved in nitric acid and the acid solution which contains uranium, plutonium and fission product is contacted with an organic solvent in a solvent extraction process which effects separation of the uranium and plutonium values from the fission products and from each other. During the dissolution of the irradiated fuel material gaseous fission products such as iodine 129, krypton and xenon are released. These gaseous fission products may present a hazard if released into the environment and they are preferably retained in the plant.
The invention will be illustrated by the following description of a plant and process for the treatment of irradiated nuclear fuel. The description is given by way of example only and has reference to the accompanying drawing which is a schematic diagram of a plant for treating irradiated nuclear fuel.
The drawing shows a cave 1 in which may be located a facility for breaking down irradiated fuel elements which have been removed from a nuclear reactor to enable the nuclear fuel material to be dissolved, a dissolver where irradiated nuclear fuel is dissolved in nitric acid or a solvent extraction plant. The cave 1 is filled with carbon dioxide. The carbon dioxide atmosphere is continuously circulated round the plant and on leaving the cave 1 is passed to one of two dryers 2a, 2b which are connected in parallel and are used alternately to remove water from the carbon dioxide, the water being removed from one dryer whilst the other is in use and has carbon dioxide passing through it. The carbon dioxide then passes to one of two cold traps 3a, 3b which are used alternately and in which condensible contaminants such as iodine are separated from the carbon dioxide.
The flow of carbon dioxide then passes to one of two heat exchangers 4a, 4b where the carbon dioxide is condensed as a film of solid carbon dioxide. The heat exchanger in which condensation occurs is cooled by a refrigerant which is circulated from a tank 5 round a cold fluid loop 6 by a pump 7. The cold fluid loop 6 contains valves 8, 9, 10, 11. When valves 8 and 9 are opened and valves 10 and 11 are closed the heat exchanger 4a is connected into the cold fluid loop 6 whereas when valves 10 and 11 are open and valves 8 and 9 are closed it is the heat exchanger 4b which is connected into the cold fluid loop. The temperature in the cold fluid loop 6 is conveniently around -95"C and the refrigerant may be a mixture of methylene chloride and chloroform in the ratio 90:10.
Whilst carbon dioxide is being condensed in one of the heat exchangers carbon dioxide to replace that being condensed is being evaporated from the other heat exchanger by passing a liquid at a temperature above the evaporation temperature of the condensed carbon dioxide through the heat exchanger. The liquid at this temperature is circulated in a hot fluid loop 12 by a pump 13. The liquid which may conveniently be at a temperature of -65"C is pumped from a tank
14 and the flow to one or other of the heat exchangers 4a, 4b is controlled by valves
15, 16, 17, 18. When valves 15 and 16 are open and valves 17 and 18 are closed the hot fluid 12 is connected to the heat exchanger 4b whereas when the valves 17 and
18 are open and the valves 15 and 16 are closed the heat exchanger 4a is connected to the hot fluid loop 12. A suitable liquid for use in the hot fluid loop 12 is a mixture of methylene chloride and chloroform.
The carbon dioxide evaporated from the heat exchanger passes back to the cave 1 through a heater 19 and a surge vessel 20. A pressure controller 21 communicating with the surge vessel 20 and linked to a valve 22 in the hot fluid loop 12 controls the rate of evaporation and a pressure controller 23 communicating with the cave 1 and linked to a valve 24 in the cold fluid loop h controls the rate of condensation.
The heat exchangers 4a, 4b are used alternately as condensors, ane evaporators, the function of the heat exchanger depending on which of the fluid loops 6, 12 is connected to the heat exchanger. The inflow of the atmosphere to the heat exchangers is controlled by valves 25, 26 and the outflow is controlled by valves 27, 28.
As the carbon dioxide is condensed in one of the heat exchangers the gases such as krypton, xenon and any air which has leaked into the plant do not condense and may be removed by purging. The heat exchangers 4a, 4b are provided with outlets 29, 30 respectively to facilitate this purging. After purging the contaminant gases are recovered by known methods. The contaminant gases are at a much greater concentration in the purge gas than they are in the air stream leaving a plant in which ventilation is achieved by passing air through the plant, through decontamination facilities and then releasing the air to the atmosphere. It is therefore easier in a plant constructed in accordance with the present invention to separate the gases krypton and xenon from the atmosphere above a plant in which irradiated nuclear fuel is treated.
The driving force to circulate the carbon dioxide around the plant is provided by the condensation and evaporation of the carbon dioxide in the heat exchangers 4a, 4b. Thus there is no need to have pumps or fans to circulate the carbon dioxide.
In plants in which radioactive materials are handled all operations have to be performed remotely to protect the operators from exposure to radioactivity. It is therefore advantageous to have no plant components, such as pump and fans, which require maintenance.
In a plant in which nuclear fuel is treated it is necessary to filter the atmosphere of the plant to remove particulate radioactive materials. In a plant constructed according to the present invention the condensation of the carbon dioxide or other gas causes deposition of particulate materials in the heat exchangers and thus the need for filtration of the atmosphere is reduced.
WHAT WE CLAIM IS:
1. A plant in which the atmosphere is contained and continuously circulated in a closed circuit having means whereby circulation of the atmosphere is effected by the driving force obtained from the condensation of at least part of the atmosphere circulating in the plant in a first heat exchanger and the subsequent evaporation of the condensed atmosphere from said first heat exchanger, the plant also having a further heat exchanger in which evaporation of condensed atmosphere occurs when condensation is occurring in the first heat exchanger and condensation of at least part of the atmosphere occurs when evaporation is occurring in the first heat exchanger, the first and further heat exchangers being used alternately to provide a continuous driving force to effect circulation of the atmosphere.
2. A plant as claimed in claim 1 wherein the atmosphere comprises a gas the boiling point of which is above -100"C.
3. A plant as claimed in claim 1 wherein the atmosphere comprises a gas which sublimes at a temperature above -100"C.
4. A plant as claimed in claim 3 wherein the gas is carbon dioxide.
5. A plant as claimed in claim 3 wherein the gas is sulphur hexafluoride.
6. A plant as claimed in claim 2 wherein the gas is a fluorocarbon.
7. A plant as claimed in any one of the preceding claims wherein the means whereby circulation of the atmosphere is effected include valves to direct the atmosphere circulating in the plant into one of the heat exchangers and includes means whereby refrigerant is passed to said one of the heat exchangers to cause condensation to occur and whereby a liquid at a temperature above the evaporation temperature of the condensate in the other of the heat exchangers is passed into said other of the heat exchangers to cause evaporation to occur.
8. A plant as claimed in any one of the preceding claims including a vessel in which nuclear fuel is treated and through which the atmosphere is circulated by the driving force obtained from the condensation of at least part of the atmosphere in one of the heat exchangers and the evaporation of condensate from the other of said heat exchangers.
9. A plant as claimed in claim 8 wherein dryers are provided to remove water and cold traps are provided to remove iodine from the circulating atmosphere before it passes to the heat exchangers.
10. A plant as claimed in either claim 8 or claim 9 wherein means are provided to purge the heat exchangers to remove gases which do not condense during the condensation of said part of the atmosphere.
11. A plant substantially as hereinbefore described with reference to the accompanying drawings.
12. A plant in which nuclear fuel is treated substantially as hereinbefore described with reference to the accompanying drawing.
13. A process in which the atmosphere under which the process is performed is contained in a plant and continuously circulated in a closed circuit including the steps of alternately condensing and evaporating at least a part of the atmosphere circulating in the plant in each of a pair of heat exchangers, one of said pair of heat exchangers being used to condense said part of the atmosphere whilst the other of said pair of heat exchangers is used to evaporate to provide a continuous driving force to effect circulation of the atmosphere around the plant.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (24)
1. A plant in which the atmosphere is contained and continuously circulated in a closed circuit having means whereby circulation of the atmosphere is effected by the driving force obtained from the condensation of at least part of the atmosphere circulating in the plant in a first heat exchanger and the subsequent evaporation of the condensed atmosphere from said first heat exchanger, the plant also having a further heat exchanger in which evaporation of condensed atmosphere occurs when condensation is occurring in the first heat exchanger and condensation of at least part of the atmosphere occurs when evaporation is occurring in the first heat exchanger, the first and further heat exchangers being used alternately to provide a continuous driving force to effect circulation of the atmosphere.
2. A plant as claimed in claim 1 wherein the atmosphere comprises a gas the boiling point of which is above -100"C.
3. A plant as claimed in claim 1 wherein the atmosphere comprises a gas which sublimes at a temperature above -100"C.
4. A plant as claimed in claim 3 wherein the gas is carbon dioxide.
5. A plant as claimed in claim 3 wherein the gas is sulphur hexafluoride.
6. A plant as claimed in claim 2 wherein the gas is a fluorocarbon.
7. A plant as claimed in any one of the preceding claims wherein the means whereby circulation of the atmosphere is effected include valves to direct the atmosphere circulating in the plant into one of the heat exchangers and includes means whereby refrigerant is passed to said one of the heat exchangers to cause condensation to occur and whereby a liquid at a temperature above the evaporation temperature of the condensate in the other of the heat exchangers is passed into said other of the heat exchangers to cause evaporation to occur.
8. A plant as claimed in any one of the preceding claims including a vessel in which nuclear fuel is treated and through which the atmosphere is circulated by the driving force obtained from the condensation of at least part of the atmosphere in one of the heat exchangers and the evaporation of condensate from the other of said heat exchangers.
9. A plant as claimed in claim 8 wherein dryers are provided to remove water and cold traps are provided to remove iodine from the circulating atmosphere before it passes to the heat exchangers.
10. A plant as claimed in either claim 8 or claim 9 wherein means are provided to purge the heat exchangers to remove gases which do not condense during the condensation of said part of the atmosphere.
11. A plant substantially as hereinbefore described with reference to the accompanying drawings.
12. A plant in which nuclear fuel is treated substantially as hereinbefore described with reference to the accompanying drawing.
13. A process in which the atmosphere under which the process is performed is contained in a plant and continuously circulated in a closed circuit including the steps of alternately condensing and evaporating at least a part of the atmosphere circulating in the plant in each of a pair of heat exchangers, one of said pair of heat exchangers being used to condense said part of the atmosphere whilst the other of said pair of heat exchangers is used to evaporate to provide a continuous driving force to effect circulation of the atmosphere around the plant.
14. A process as claimed in claim 13 wherein the atmosphere comprises a gas
the boiling point of which is above -100"C.
15. A process as claimed in claim 13 wherein the atmosphere comprises a gas which sublimes at a temperature above -100"C.
16. A process as claimed in claim 15 wherein the gas is carbon dioxide.
17. A process as claimed in claim 15 wherein the gas is sulphur hexafluoride.
18. A process as claimed in claim 14 wherein the gas is a fluorocarbon.
19. A process as claimed in any one of claims 13 to 18 wherein a refrigerant is passed to the heat exchanger in which condensation is occurring and a liquid at a temperature above the evaporation temperature of the condensate is passed into the heat exchanger in which evaporation is occurring.
20. A process as claimed in any of claims 13 to 19 wherein the atmosphere is circulated through a vessel in which nuclear fuel is being treated.
21. A process as claimed in claim 20 wherein the atmosphere circulating in the plant is dried to remove water vapour and cooled to cause removal of iodine between the vessel and the heat exchangers.
22. A process as claimed in claim 20 or claim 21 wherein the heat exchangers are purged during condensation to remove gases which do not condense.
23. A process substantially as hereinbefore described with reference to the accompanying drawing.
24. A process for treating nuclear fuel substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB14917/77A GB1580367A (en) | 1977-04-07 | 1977-04-07 | Chemical plant |
| FR7810231A FR2386702A1 (en) | 1977-04-07 | 1978-04-06 | METHOD OF MAINTAINING A CLOSED CIRCUIT ATMOSPHERE IN CIRCULATION, AND ITS APPLICATION TO A NUCLEAR FUEL TREATMENT PLANT |
| IT6776678A IT1108634B (en) | 1977-04-07 | 1978-04-06 | PARTICULARLY NUCLEAR CHEMICAL PLANT WITH CIRCULATING ATMOSPHERE IN CLOSED CIRCUIT AND PROCEDURE TO CREATE SUCH CIRCULATION |
| DE19782814907 DE2814907A1 (en) | 1977-04-07 | 1978-04-06 | CHEMICAL PROCESS EQUIPMENT AND PROCEDURES FOR OPERATING THE SAME |
| JP4112378A JPS53126496A (en) | 1977-04-07 | 1978-04-07 | Improvement on chemical plant |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB14917/77A GB1580367A (en) | 1977-04-07 | 1977-04-07 | Chemical plant |
| GB1491877 | 1977-04-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1580367A true GB1580367A (en) | 1980-12-03 |
Family
ID=26250893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB14917/77A Expired GB1580367A (en) | 1977-04-07 | 1977-04-07 | Chemical plant |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS53126496A (en) |
| DE (1) | DE2814907A1 (en) |
| FR (1) | FR2386702A1 (en) |
| GB (1) | GB1580367A (en) |
| IT (1) | IT1108634B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1190965B (en) * | 1962-07-04 | 1965-04-15 | Linde Eismasch Ag | Method and device for removing trace contaminants from carbon dioxide |
| FR1500161A (en) * | 1966-07-29 | 1967-11-03 | Commissariat Energie Atomique | Heat pump |
| JPS49122007A (en) * | 1973-03-31 | 1974-11-21 | ||
| DE2426764C2 (en) * | 1974-06-01 | 1981-07-09 | Kernforschungsanlage Jülich GmbH, 5170 Jülich | Process for separating krypton from a radioactive exhaust gas mixture and gas separation system for carrying out the process |
| JPS51126910A (en) * | 1975-04-30 | 1976-11-05 | Hitachi Ltd | Process and apparatus for removing liquid metals contained in cover ga s |
-
1977
- 1977-04-07 GB GB14917/77A patent/GB1580367A/en not_active Expired
-
1978
- 1978-04-06 IT IT6776678A patent/IT1108634B/en active
- 1978-04-06 DE DE19782814907 patent/DE2814907A1/en not_active Withdrawn
- 1978-04-06 FR FR7810231A patent/FR2386702A1/en active Granted
- 1978-04-07 JP JP4112378A patent/JPS53126496A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| IT7867766A0 (en) | 1978-04-06 |
| FR2386702A1 (en) | 1978-11-03 |
| DE2814907A1 (en) | 1978-10-19 |
| JPS53126496A (en) | 1978-11-04 |
| FR2386702B1 (en) | 1983-10-14 |
| IT1108634B (en) | 1985-12-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |