DE3135540A1 - Verfahren zur trennung von isotopen mit der methode der geregelten verteilung unter ausnutzung insbesondere des isotopen-konzentrationseffektes - Google Patents
Verfahren zur trennung von isotopen mit der methode der geregelten verteilung unter ausnutzung insbesondere des isotopen-konzentrationseffektesInfo
- Publication number
- DE3135540A1 DE3135540A1 DE19813135540 DE3135540A DE3135540A1 DE 3135540 A1 DE3135540 A1 DE 3135540A1 DE 19813135540 DE19813135540 DE 19813135540 DE 3135540 A DE3135540 A DE 3135540A DE 3135540 A1 DE3135540 A1 DE 3135540A1
- Authority
- DE
- Germany
- Prior art keywords
- isotopes
- isotope
- phase
- range
- concentration
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000000694 effects Effects 0.000 title claims description 5
- 238000005372 isotope separation Methods 0.000 title 1
- 239000002594 sorbent Substances 0.000 claims abstract description 42
- 238000000926 separation method Methods 0.000 claims abstract description 39
- 239000000203 mixture Substances 0.000 claims abstract description 18
- 239000007787 solid Substances 0.000 claims abstract description 13
- 239000003446 ligand Substances 0.000 claims abstract description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000007864 aqueous solution Substances 0.000 claims abstract description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 4
- 239000000243 solution Substances 0.000 claims description 31
- 238000001179 sorption measurement Methods 0.000 claims description 21
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 16
- 238000003795 desorption Methods 0.000 claims description 16
- 238000000605 extraction Methods 0.000 claims description 12
- 230000000155 isotopic effect Effects 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 8
- 241000233866 Fungi Species 0.000 claims description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 6
- 239000001913 cellulose Substances 0.000 claims description 5
- 229920002678 cellulose Polymers 0.000 claims description 5
- -1 citric Chemical class 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000004809 Teflon Substances 0.000 claims description 3
- 229920006362 Teflon® Polymers 0.000 claims description 3
- 229920001577 copolymer Polymers 0.000 claims description 3
- 125000000524 functional group Chemical group 0.000 claims description 3
- 239000008246 gaseous mixture Substances 0.000 claims description 3
- 150000002500 ions Chemical class 0.000 claims description 3
- XTAZYLNFDRKIHJ-UHFFFAOYSA-N n,n-dioctyloctan-1-amine Chemical compound CCCCCCCCN(CCCCCCCC)CCCCCCCC XTAZYLNFDRKIHJ-UHFFFAOYSA-N 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 239000012047 saturated solution Substances 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 2
- KRKNYBCHXYNGOX-UHFFFAOYSA-K Citrate Chemical compound [O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O KRKNYBCHXYNGOX-UHFFFAOYSA-K 0.000 claims description 2
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 2
- 229910002651 NO3 Inorganic materials 0.000 claims description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- 230000002378 acidificating effect Effects 0.000 claims description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 2
- 230000000536 complexating effect Effects 0.000 claims description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 2
- 239000011261 inert gas Substances 0.000 claims description 2
- 229910017604 nitric acid Inorganic materials 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 239000011574 phosphorus Substances 0.000 claims description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 2
- 235000011152 sodium sulphate Nutrition 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 claims description 2
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 claims description 2
- 150000001768 cations Chemical class 0.000 claims 1
- 239000002738 chelating agent Substances 0.000 claims 1
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 abstract description 31
- 229910052770 Uranium Inorganic materials 0.000 abstract description 30
- 239000007788 liquid Substances 0.000 abstract description 9
- 239000000126 substance Substances 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 2
- 239000007789 gas Substances 0.000 abstract description 2
- 229910052744 lithium Inorganic materials 0.000 abstract description 2
- 239000012457 nonaqueous media Substances 0.000 abstract description 2
- 230000005855 radiation Effects 0.000 abstract 1
- 239000012071 phase Substances 0.000 description 25
- 238000006243 chemical reaction Methods 0.000 description 8
- 239000007791 liquid phase Substances 0.000 description 8
- 230000008859 change Effects 0.000 description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000002798 spectrophotometry method Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000011734 sodium Substances 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- 229910002007 uranyl nitrate Inorganic materials 0.000 description 2
- KZEVSDGEBAJOTK-UHFFFAOYSA-N 1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-2-[5-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]-1,3,4-oxadiazol-2-yl]ethanone Chemical compound N1N=NC=2CN(CCC=21)C(CC=1OC(=NN=1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)=O KZEVSDGEBAJOTK-UHFFFAOYSA-N 0.000 description 1
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 1
- NJZWLEZSGOTSHR-UHFFFAOYSA-N 3-[(2-arsonophenyl)diazenyl]-4,5-dihydroxynaphthalene-2,7-disulfonic acid Chemical compound OC1=C2C(O)=CC(S(O)(=O)=O)=CC2=CC(S(O)(=O)=O)=C1N=NC1=CC=CC=C1[As](O)(O)=O NJZWLEZSGOTSHR-UHFFFAOYSA-N 0.000 description 1
- 235000005979 Citrus limon Nutrition 0.000 description 1
- 244000131522 Citrus pyriformis Species 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 241000228143 Penicillium Species 0.000 description 1
- 241000228150 Penicillium chrysogenum Species 0.000 description 1
- ZQOMKIOQTCAGCM-UHFFFAOYSA-L [Na+].[Na+].OS(O)(=O)=O.[O-]S([O-])(=O)=O Chemical compound [Na+].[Na+].OS(O)(=O)=O.[O-]S([O-])(=O)=O ZQOMKIOQTCAGCM-UHFFFAOYSA-L 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- KQNPFQTWMSNSAP-UHFFFAOYSA-N alpha-isobutyric acid Natural products CC(C)C(O)=O KQNPFQTWMSNSAP-UHFFFAOYSA-N 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229920001429 chelating resin Polymers 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000009918 complex formation Effects 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- INIGCWGJTZDVRY-UHFFFAOYSA-N hafnium zirconium Chemical compound [Zr].[Hf] INIGCWGJTZDVRY-UHFFFAOYSA-N 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000005445 isotope effect Effects 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052705 radium Inorganic materials 0.000 description 1
- HCWPIIXVSYCSAN-UHFFFAOYSA-N radium atom Chemical compound [Ra] HCWPIIXVSYCSAN-UHFFFAOYSA-N 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910000384 uranyl sulfate Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D59/00—Separation of different isotopes of the same chemical element
- B01D59/28—Separation by chemical exchange
- B01D59/30—Separation by chemical exchange by ion exchange
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D59/00—Separation of different isotopes of the same chemical element
- B01D59/22—Separation by extracting
- B01D59/26—Separation by extracting by sorption, i.e. absorption, adsorption, persorption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D59/00—Separation of different isotopes of the same chemical element
- B01D59/28—Separation by chemical exchange
- B01D59/32—Separation by chemical exchange by exchange between fluids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D59/00—Separation of different isotopes of the same chemical element
- B01D59/36—Separation by biological methods
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Treatment Of Liquids With Adsorbents In General (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU74699/81A AU547079B2 (en) | 1981-08-28 | 1981-08-28 | Isotope separation process |
| GB08126409A GB2104797B (en) | 1981-08-28 | 1981-08-29 | A process for the separation of isotopes |
| IT23812/81A IT1138580B (it) | 1981-08-28 | 1981-09-04 | Processo per la separazione di isotopi con il metodo della distribuzione regolata utilizzando in particolare l'effetto di concentrazione isotopica |
| DE19813135540 DE3135540A1 (de) | 1981-08-28 | 1981-09-08 | Verfahren zur trennung von isotopen mit der methode der geregelten verteilung unter ausnutzung insbesondere des isotopen-konzentrationseffektes |
| FR8117190A FR2512354B1 (fr) | 1981-08-28 | 1981-09-10 | Procede pour la separation d'isotopes par une distribution controlee, en utilisant specialement un effet de concentration isotopique |
| JP56145662A JPS5855030A (ja) | 1981-08-28 | 1981-09-17 | 同位体の分離方法 |
| CA000386288A CA1185074A (en) | 1981-08-28 | 1981-09-21 | Separation of isotopes by controlled distribution |
| DD81234551A DD210517A3 (de) | 1981-08-28 | 1981-11-02 | Verfahren zur isotopentrennung durch steuerbare trennmethoden unter anwendung eines besonderen gleichgewichtskonzentrationseffekts |
Applications Claiming Priority (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU74699/81A AU547079B2 (en) | 1981-08-28 | 1981-08-28 | Isotope separation process |
| GB08126409A GB2104797B (en) | 1981-08-28 | 1981-08-29 | A process for the separation of isotopes |
| IT23812/81A IT1138580B (it) | 1981-08-28 | 1981-09-04 | Processo per la separazione di isotopi con il metodo della distribuzione regolata utilizzando in particolare l'effetto di concentrazione isotopica |
| DE19813135540 DE3135540A1 (de) | 1981-08-28 | 1981-09-08 | Verfahren zur trennung von isotopen mit der methode der geregelten verteilung unter ausnutzung insbesondere des isotopen-konzentrationseffektes |
| FR8117190A FR2512354B1 (fr) | 1981-08-28 | 1981-09-10 | Procede pour la separation d'isotopes par une distribution controlee, en utilisant specialement un effet de concentration isotopique |
| JP56145662A JPS5855030A (ja) | 1981-08-28 | 1981-09-17 | 同位体の分離方法 |
| CA000386288A CA1185074A (en) | 1981-08-28 | 1981-09-21 | Separation of isotopes by controlled distribution |
| DD81234551A DD210517A3 (de) | 1981-08-28 | 1981-11-02 | Verfahren zur isotopentrennung durch steuerbare trennmethoden unter anwendung eines besonderen gleichgewichtskonzentrationseffekts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE3135540A1 true DE3135540A1 (de) | 1983-06-09 |
Family
ID=27570105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19813135540 Withdrawn DE3135540A1 (de) | 1981-08-28 | 1981-09-08 | Verfahren zur trennung von isotopen mit der methode der geregelten verteilung unter ausnutzung insbesondere des isotopen-konzentrationseffektes |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS5855030A (enrdf_load_stackoverflow) |
| AU (1) | AU547079B2 (enrdf_load_stackoverflow) |
| CA (1) | CA1185074A (enrdf_load_stackoverflow) |
| DD (1) | DD210517A3 (enrdf_load_stackoverflow) |
| DE (1) | DE3135540A1 (enrdf_load_stackoverflow) |
| FR (1) | FR2512354B1 (enrdf_load_stackoverflow) |
| GB (1) | GB2104797B (enrdf_load_stackoverflow) |
| IT (1) | IT1138580B (enrdf_load_stackoverflow) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4584183A (en) * | 1983-12-21 | 1986-04-22 | Westinghouse Electric Corp. | Process for separating zirconium isotopes |
| US4767513A (en) * | 1987-03-10 | 1988-08-30 | Westinghouse Electric Corp. | Zirconium isotope separation process |
| US5130001A (en) * | 1990-12-03 | 1992-07-14 | Westinghouse Electric Corp. | Uranium isotope separation by continuous anion exchange chromatography |
| CN105561790B (zh) * | 2015-12-23 | 2017-07-18 | 中国科学院上海高等研究院 | 苯并氮杂冠醚类化合物分离锂同位素的应用 |
| CN105540705B (zh) * | 2016-01-19 | 2018-02-16 | 东华大学 | 一种高浓度壬基酚聚氧乙烯醚废水热催化制备固态吸附剂的方法及其装置 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2839317A1 (de) * | 1977-09-14 | 1979-03-29 | Asahi Chemical Ind | Vorrichtung und verfahren zur trennung von isotopen |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1514094A (fr) * | 1966-02-15 | 1968-02-23 | Aquitaine Petrole | Procédé de production et de mesure d'enrichissement isotopique |
| JPS5122596B2 (enrdf_load_stackoverflow) * | 1972-10-05 | 1976-07-10 | ||
| US3995009A (en) * | 1975-09-15 | 1976-11-30 | The United States Of America As Represented By The United States Energy Research And Development Administration | Process for loading weak-acid ion exchange resin with uranium |
| JPS562834A (en) * | 1979-06-22 | 1981-01-13 | Asahi Chem Ind Co Ltd | New separation of isotope |
-
1981
- 1981-08-28 AU AU74699/81A patent/AU547079B2/en not_active Ceased
- 1981-08-29 GB GB08126409A patent/GB2104797B/en not_active Expired
- 1981-09-04 IT IT23812/81A patent/IT1138580B/it active
- 1981-09-08 DE DE19813135540 patent/DE3135540A1/de not_active Withdrawn
- 1981-09-10 FR FR8117190A patent/FR2512354B1/fr not_active Expired
- 1981-09-17 JP JP56145662A patent/JPS5855030A/ja active Granted
- 1981-09-21 CA CA000386288A patent/CA1185074A/en not_active Expired
- 1981-11-02 DD DD81234551A patent/DD210517A3/xx not_active IP Right Cessation
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2839317A1 (de) * | 1977-09-14 | 1979-03-29 | Asahi Chemical Ind | Vorrichtung und verfahren zur trennung von isotopen |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2104797A (en) | 1983-03-16 |
| DD210517A3 (de) | 1984-06-13 |
| GB2104797B (en) | 1985-11-13 |
| AU547079B2 (en) | 1985-10-03 |
| JPH0253087B2 (enrdf_load_stackoverflow) | 1990-11-15 |
| JPS5855030A (ja) | 1983-04-01 |
| IT8123812A0 (it) | 1981-09-04 |
| IT1138580B (it) | 1986-09-17 |
| FR2512354B1 (fr) | 1986-05-02 |
| AU7469981A (en) | 1983-03-03 |
| CA1185074A (en) | 1985-04-09 |
| FR2512354A1 (fr) | 1983-03-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8110 | Request for examination paragraph 44 | ||
| 8130 | Withdrawal |