JP7495128B2 - Hydrogen production method using aluminum alloy - Google Patents
Hydrogen production method using aluminum alloy Download PDFInfo
- Publication number
- JP7495128B2 JP7495128B2 JP2021063762A JP2021063762A JP7495128B2 JP 7495128 B2 JP7495128 B2 JP 7495128B2 JP 2021063762 A JP2021063762 A JP 2021063762A JP 2021063762 A JP2021063762 A JP 2021063762A JP 7495128 B2 JP7495128 B2 JP 7495128B2
- Authority
- JP
- Japan
- Prior art keywords
- reaction
- aluminum alloy
- hydrogen
- aqueous solution
- alkaline aqueous
- 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.)
- Active
Links
- 239000001257 hydrogen Substances 0.000 title claims description 24
- 229910052739 hydrogen Inorganic materials 0.000 title claims description 24
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims description 21
- 229910000838 Al alloy Inorganic materials 0.000 title claims description 17
- 238000004519 manufacturing process Methods 0.000 title claims description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 30
- 239000007864 aqueous solution Substances 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 239000000243 solution Substances 0.000 claims description 9
- 229910052681 coesite Inorganic materials 0.000 claims description 5
- 229910052906 cristobalite Inorganic materials 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 235000012239 silicon dioxide Nutrition 0.000 claims description 5
- 229910052682 stishovite Inorganic materials 0.000 claims description 5
- 229910052905 tridymite Inorganic materials 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 3
- 150000002431 hydrogen Chemical class 0.000 claims description 3
- 235000019795 sodium metasilicate Nutrition 0.000 claims description 3
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 3
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 2
- 230000001172 regenerating effect Effects 0.000 claims 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 9
- 229910052782 aluminium Inorganic materials 0.000 description 9
- 238000002474 experimental method Methods 0.000 description 8
- 239000012295 chemical reaction liquid Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910001388 sodium aluminate Inorganic materials 0.000 description 2
- 229910018626 Al(OH) Inorganic materials 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 229910021577 Iron(II) chloride Inorganic materials 0.000 description 1
- 229910019440 Mg(OH) Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 235000010216 calcium carbonate Nutrition 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 235000011148 calcium chloride Nutrition 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 229910000015 iron(II) carbonate Inorganic materials 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 235000014380 magnesium carbonate Nutrition 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 235000011147 magnesium chloride Nutrition 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Description
本発明は、アルミニウムとアルカリ水溶液とを反応させて、水素を得る水素の製造方法に関し、特にアルミニウム合金に含まれるアルミニウム以外の成分の影響を改善した水素の製造方法に係る。 The present invention relates to a method for producing hydrogen by reacting aluminum with an alkaline aqueous solution to obtain hydrogen, and in particular to a method for producing hydrogen that reduces the effects of components other than aluminum contained in an aluminum alloy.
アルミニウムをｐＨ３以上のアルカリ水溶液に反応させると、溶解反応により水素が発生する。
アルカリ水溶液として、水酸化ナトリウムを例にして反応式を下記に示す。
（１）２Ａｌ＋２ＮａＯＨ＋２Ｈ２Ｏ → ２ＮａＡｌＯ２＋３Ｈ２
ここで、水素の発生に必要なＮａＯＨは、反応によりＮａＡｌＯ２として消耗されるが、ある程度の濃度になると、水溶性のＮａＡｌＯ２（アルミン酸ソーダ）は加水分解により、下記のようにＮａＯＨが再生される。
（２）ＮａＡｌＯ２＋２Ｈ２Ｏ → Ａｌ（ＯＨ）３＋ＮａＯＨ
しかし、アルミニウム合金中には、鋳造性や展伸性、強度や切削性等を考慮して、各種添加成分が含有する。
例えば、ＪＩＳ ＡＤＣ１２等は、ダイカスト鋳造用合金であり、Ｓｉが多く含まれる。
したがって、各種製品の製造に使用されたアルミニウム合金の端材や、製造工程で発生する切削クズや切粉等を水素製造の原材料に用いた場合に、アルミニウム以外の成分が問題となる。
When aluminum is reacted with an alkaline aqueous solution having a pH of 3 or more, hydrogen is generated by the dissolution reaction.
The reaction formula is shown below using sodium hydroxide as an example of an alkaline aqueous solution.
(1) 2Al + 2NaOH + 2H2O → 2NaAlO2 + 3H2
Here, the NaOH required for hydrogen generation is consumed as NaAlO 2 through the reaction, but when it reaches a certain concentration, water-soluble NaAlO 2 (sodium aluminate) is hydrolyzed to regenerate NaOH as shown below.
(2) NaAlO2 + 2H2O → Al(OH) 3 + NaOH
However, aluminum alloys contain various additive elements in consideration of castability, ductility, strength, machinability, and the like.
For example, JIS ADC12 and the like are alloys for die casting and contain a large amount of Si.
Therefore, when scraps of aluminum alloys used in the manufacture of various products, or cutting waste and chips generated during the manufacturing process, are used as raw materials for hydrogen production, components other than aluminum become problematic.
特許文献１には、反応器から固形物を排出しながら連続的に水素を得る方法を開示するが、Ｓｉ等のアルミニウム合金中の添加成分はアルカリ水溶液中に溶解した状態で存在するので、除去することができない。 Patent Document 1 discloses a method for continuously obtaining hydrogen while discharging solids from a reactor, but additive components in the aluminum alloy, such as Si, exist in a dissolved state in the alkaline aqueous solution and cannot be removed.
本発明は、アルミニウム合金を水素製造の原材料に用いた場合に、アルカリ水溶液中に溶解するアルミニウム以外の成分の影響を抑えた水素の製造方法の提供を目的とする。 The present invention aims to provide a method for producing hydrogen that reduces the effects of components other than aluminum that dissolve in an alkaline aqueous solution when an aluminum alloy is used as a raw material for hydrogen production.
本発明に係る水素の製造方法は、アルミニウム合金をアルカリ水溶液に反応させて水素を製造する方法であって、前記アルカリ水溶液中に溶解された前記アルミニウム合金に含まれるアルミニウム以外の成分を不溶化し除去するための不溶化補助剤が前記アルカリ水溶液に添加されていることを特徴とする。
このように、不溶化補助剤は、水素製造に用いる反応液中に予め、あるいは途中で添加してもよい。
The method for producing hydrogen according to the present invention is a method for producing hydrogen by reacting an aluminum alloy with an alkaline aqueous solution, and is characterized in that an insolubilization assistant is added to the alkaline aqueous solution to insolubilize and remove components other than aluminum contained in the aluminum alloy dissolved in the alkaline aqueous solution.
In this manner, the insolubilizer may be added to the reaction liquid used for hydrogen production in advance or during the process.
また、反応が終了した反応液の再生に使用することもでき、アルミニウム合金をアルカリ水溶液に反応させて水素を製造する方法であって、反応液中に含まれる前記アルミニウム合金中のアルミニウム以外の成分を不溶化し除去するための不溶化補助剤を前記反応液中に添加し、前記アルカリ水溶液を再生し、再利用することを特徴としてもよい。 It can also be used to regenerate a reaction solution after the reaction has been completed. A method for producing hydrogen by reacting an aluminum alloy with an alkaline aqueous solution may be characterized in that an insolubilizing agent is added to the reaction solution to insolubilize and remove components other than aluminum in the aluminum alloy contained in the reaction solution, and the alkaline aqueous solution is regenerated and reused.
ここで、不溶化補助剤はＣａＳＯ４，ＣａＣＯ３，ＣａＣｌ２，Ｃａ（ＯＨ）２，ＭｇＳＯ４，ＭｇＣＯ３，ＭｇＣｌ２，Ｍｇ（ＯＨ）２，ＦｅＳＯ４，ＦｅＣＯ３，ＦｅＣｌ２，Ｆｅ（ＯＨ）２のうち、いずれか１つ以上であるのが好ましい。 Here, the insolubilizing agent is preferably one or more of CaSO4 , CaCO3 , CaCl2 , Ca(OH) 2 , MgSO4 , MgCO3 , MgCl2 , Mg(OH) 2 , FeSO4 , FeCO3 , FeCl2 , and Fe(OH) 2 .
例えば、アルミニウム合金中に含まれるＳｉもアルカリ水溶液と反応し、その反応式を下記に示す。
（３）Ｓｉ＋２ＮａＯＨ＋Ｈ２Ｏ → Ｎａ２ＳｉＯ３＋２Ｈ２
これにより、ＮａＯＨは、Ｎａ２ＳｉＯ３として消耗されるが、このＮａ２ＳｉＯ３は加水分解しないので、ＮａＡｌＯ２のようにＮａＯＨが再生されない。
そこで、例えば不溶化補助剤としてＣａ（ＯＨ）２を添加すると、下記のような反応が生じる。
Ｎａ２ＳｉＯ３（Ｎａ２Ｏ・ＳｉＯ２）＋Ｃａ（ＯＨ）２ → ＣａＯ・ＳｉＯ２＋２ＮａＯＨ
ここで、ＣａＯ・ＳｉＯ２は、アルカリ水溶液に不溶性となり、固形物として除去でき、ＮａＯＨが再生される。
For example, Si contained in an aluminum alloy also reacts with an alkaline aqueous solution, and the reaction formula is shown below.
(3) Si + 2NaOH + H2O → Na2SiO3 + 2H2
As a result, NaOH is consumed as Na 2 SiO 3 , but since this Na 2 SiO 3 does not hydrolyze, NaOH is not regenerated as in the case of NaAlO 2 .
Therefore, for example, when Ca(OH) 2 is added as an insolubilizing agent, the following reaction occurs:
Na2SiO3 ( Na2O.SiO2 )+Ca(OH ) 2 → CaO.SiO2 + 2NaOH
Here, CaO.SiO2 becomes insoluble in the alkaline aqueous solution and can be removed as a solid, and NaOH is regenerated.
本発明に係る水素の製造方法にあっては、アルミニウム合金をアルカリ水溶液に溶解した際に、アルミニウム合金中に含まれるアルミニウム以外の可溶性成分を不溶化補助剤にて反応液から除去できるとともにアルカリ成分が再生されるので、効率よく水素を製造することができる。 In the hydrogen production method according to the present invention, when an aluminum alloy is dissolved in an alkaline aqueous solution, soluble components other than aluminum contained in the aluminum alloy can be removed from the reaction solution by the insolubilization aid, and the alkaline components are regenerated, so hydrogen can be produced efficiently.
本発明に係る効果を実験にて実証したので、以下説明する。
水酸化ナトリウム（ＮａＯＨ）４０ｇ／ｌ，５０ｍｌの反応液をビーカーに準備し、アルミニウム合金の切粉０．２ｇを添加し、発生した水素（ガス）を回収した。
アルミニウム合金は、Ｓｉ：９．６～１２．０％，Ｃｕ：１．５～３．５％が含有しているものを用いた。
The effects of the present invention have been demonstrated through experiments, which will be described below.
A reaction solution of 50 ml of 40 g/l sodium hydroxide (NaOH) was prepared in a beaker, 0.2 g of aluminum alloy cutting chips was added, and the generated hydrogen (gas) was collected.
The aluminum alloy used contained 9.6 to 12.0% of Si and 1.5 to 3.5% of Cu.
上記の方法で、第１回目に反応させた反応終了後の反応液から濾過にて固形分を除去し、順次第２回目，３回目と実験を繰り返した。
実施例としては、反応終了後の反応液にＣａ（ＯＨ）２を約１％添加し、反応実験を繰り返した。
一方、比較例にはＣａ（ＯＨ）２を添加せずに、そのまま反応実験を繰り返した。
その結果、比較例では５回の実験の繰り返しにより、水素の発生量が第１回目の発生量に対して約８０％まで低下したが、実施例は５回目の実験による水素発生量は、第１回目の発生量よりも約９５％の低下に留まっていた。
これにより、不溶化補助剤の反応液への添加により、水素発生量の低下を抑えることができることが確認できた。
なお、不溶化補助剤の添加量は、アルミニウム合金中のアルミニウム以外の成分量に応じて選定されるが、概ね反応液に対して０．１～１０質量％添加されるのが好ましい。
After the first reaction was completed using the above method, the solid contents were removed from the reaction solution by filtration, and the experiment was repeated a second time and a third time.
As an example, about 1% Ca(OH) 2 was added to the reaction solution after the reaction was completed, and the reaction experiment was repeated.
On the other hand, in the comparative example, Ca(OH) 2 was not added and the reaction experiment was repeated as it was.
As a result, in the comparative example, after five repeated experiments, the amount of hydrogen generated was reduced to approximately 80% of the amount generated in the first experiment, whereas in the example, the amount of hydrogen generated in the fifth experiment was only approximately 95% lower than the amount generated in the first experiment.
This confirmed that the addition of an insolubilizer to the reaction liquid can suppress the decrease in the amount of hydrogen generated.
The amount of the insolubilizer to be added is selected depending on the amount of components other than aluminum in the aluminum alloy, but it is generally preferable to add 0.1 to 10 mass % based on the reaction liquid.
Claims (1)
前記水素を製造した反応終了後の反応液にＣａ（ＯＨ） ２ を添加し、下記反応式（１）によりＮａＯＨを再生することで、前記反応終了後の反応液を再生しながら繰り返し水素の製造に用いることを特徴とする水素の製造方法。
Ｎａ２ＳｉＯ３（Ｎａ２Ｏ・ＳｉＯ２）＋Ｃａ（ＯＨ）２ → ＣａＯ・ＳｉＯ２＋２ＮａＯＨ・・・・・・・・・（１） A method for producing hydrogen by reacting scraps or cutting chips of an aluminum alloy containing 9.6 to 12.0% Si with an alkaline aqueous solution, comprising the steps of:
A method for producing hydrogen , comprising adding Ca(OH) 2 to the reaction solution after completion of the reaction in which hydrogen is produced , and regenerating NaOH according to the following reaction formula (1), thereby repeatedly using the reaction solution after completion of the reaction to produce hydrogen while regenerating it.
Na2SiO3 ( Na2O.SiO2 )+Ca( OH ) 2 → CaO.SiO2 + 2NaOH (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021063762A JP7495128B2 (en) | 2021-04-02 | 2021-04-02 | Hydrogen production method using aluminum alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021063762A JP7495128B2 (en) | 2021-04-02 | 2021-04-02 | Hydrogen production method using aluminum alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2022158693A JP2022158693A (en) | 2022-10-17 |
| JP7495128B2 true JP7495128B2 (en) | 2024-06-04 |
Family
ID=83638498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2021063762A Active JP7495128B2 (en) | 2021-04-02 | 2021-04-02 | Hydrogen production method using aluminum alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP7495128B2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003190906A (en) | 2001-12-25 | 2003-07-08 | Itec Co Ltd | Waste aluminum treating apparatus |
| JP2016509570A (en) | 2013-02-01 | 2016-03-31 | レフレクティア，エセ．アー． | Method for producing hydrogen by reaction with aluminum |
| JP2018002557A (en) | 2016-07-05 | 2018-01-11 | アルハイテック株式会社 | Hydrogen production apparatus and production method using the same |
-
2021
- 2021-04-02 JP JP2021063762A patent/JP7495128B2/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003190906A (en) | 2001-12-25 | 2003-07-08 | Itec Co Ltd | Waste aluminum treating apparatus |
| JP2016509570A (en) | 2013-02-01 | 2016-03-31 | レフレクティア，エセ．アー． | Method for producing hydrogen by reaction with aluminum |
| JP2018002557A (en) | 2016-07-05 | 2018-01-11 | アルハイテック株式会社 | Hydrogen production apparatus and production method using the same |
Non-Patent Citations (1)
| Title |
|---|
| 伊藤尚，ドロマイトを用いたアルミン酸ソーダ溶液の脱ケイ酸処理，日本鉱業会誌，1968年08月18日，Vol.84,No.958，p.123-128，DOI: 10.2473/shigentosozai1953.84.958_123 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2022158693A (en) | 2022-10-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH072512A (en) | Preparation of pure amorphous silica from rock | |
| JP2008528421A (en) | Magnesium oxide manufacturing process | |
| CN110629015B (en) | Iron olivine type slag desiliconization method | |
| CN103030126A (en) | Recovery method for waste phosphoric acid liquor generated in production process of formed foil | |
| JP7495128B2 (en) | Hydrogen production method using aluminum alloy | |
| JPH0481526B2 (en) | ||
| CN109797283B (en) | Hydrochloric acid leaching method for silicon-containing nickel hydroxide cobalt | |
| KR20230090326A (en) | material disposal method | |
| US1618105A (en) | Process of manufacturing aluminum hydroxide | |
| WO2001034859A1 (en) | Method for reduction of nickel | |
| CN111807829A (en) | Method for preparing magnesia-alumina spinel by using aluminum ash and bischofite | |
| US4381937A (en) | Method for producing cobalt metal powder | |
| JP7470941B2 (en) | Hydrogen production method and production device | |
| CN108275720A (en) | A kind of method that zirconium oxychloride white residue takes off zirconium | |
| JP4405281B2 (en) | Recycling method of electroless nickel plating waste liquid | |
| CN109825724B (en) | Method for removing silicon in tungsten smelting | |
| JPS5839894B2 (en) | Method for removing phosphorus and silicon from water-soluble smelting slag | |
| JP2000178663A (en) | Treatment of aluminum dross | |
| JP7535263B2 (en) | Hydrogen production method and method for reusing the residue | |
| JP2001192849A (en) | Method for regenerating electroless nickel plating solution | |
| JP7423055B2 (en) | Method for recovering alkaline aqueous solution used for hydrogen production | |
| JP3181824B2 (en) | Treatment method for electroless nickel plating aging solution | |
| US3712838A (en) | Regeneration of caustic liquor for etching aluminum | |
| JP7470977B2 (en) | Hydrogen generating agent and method for producing hydrogen using the same | |
| RU2036836C1 (en) | Method for production of silicon dioxide |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20230510 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20231208 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20240129 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20240312 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20240507 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20240516 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 7495128 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |