Granted Patent
B2
US 12,731,807 · App. 18/036,557 · Granted Sep 8, 2026
Electrolyte regeneration for redox flow batteries based on ferrocyanide and/or ferricyanide salts
Inventors:
Olga Ekkert (Hanau, DE); Evgeny Larionov (Hanua, DE); Jan Hartwig (Alzenau, DE); Eduard Baal (Offenbach, DE)
Assignee:
CMBlu Energy AG
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Abstract
The present invention provides a process for the regeneration of an aqueous electrolyte solution of a redox-flow battery containing at least one inorganic redox active compound, said process comprising at least one of the following steps (a), (b) and/or (c): (a) treatment of the electrolyte solution in order reduce the at least one inorganic redox active compound to the reduced state; (b) removal of precipitated material from the electrolyte solution and subsequent modification of the precipitated material to obtain at least one water soluble inorganic redox active compound; and/or (c) separation of inorganic redox active compounds from redox active compounds other than the at least one inorganic redox active compound.
Claims (31)
1 . A process for the regeneration of an aqueous electrolyte solution of a redox-flow battery containing at least one inorganic redox active compound, said process comprising:
removing precipitated material from the electrolyte solution and modifying the precipitated material to obtain at least one water soluble inorganic redox active compound,
wherein modifying the precipitated material involves treatment of the precipitate with a cyanide.
2 . The process according to claim 1 , wherein the at least one inorganic redox active compound is selected from a metal ion complex.
3 . The process according to claim 1 , wherein the precipitated material is removed from the electrolyte solution by filtration or centrifugation.
4 . The process according to claim 1 , wherein the process further comprises:
separating inorganic redox active compounds from redox active compounds other than the at least one inorganic redox active compound,
wherein the redox active compounds other than the at least one inorganic redox active compound are phenazine compounds or substituted phenazine compounds.
5 . The process according to claim 1 , wherein the process further comprises:
treating the electrolyte solution in order to reduce the at least one inorganic redox active compound to the reduced state,
wherein reducing the at least one inorganic redox active compound is carried out using a reducing agent.
6 . The process according to claim 2 , wherein the metal ion complex is an iron metal ion complex.
7 . The process according to claim 6 , wherein the iron metal ion complex is M 3 [Fe(CN) 6 ] and M 4 [Fe(CN) 6 ], wherein M is a cation.
8 . The process according to claim 7 , wherein the cation is sodium, potassium, ammonium, or a mixture thereof.
9 . The process according to claim 5 , wherein the reducing agent is sodium sulfite, potassium sulfite, sodium dithionite, sodium formate, formic acid, and/or ascorbic acid.
10 . The process according to claim 1 , wherein the precipitated material is removed from the electrolyte solution by filtration.
11 . The process according to claim 1 , wherein the cyanide is KCN and/or NaCN.
12 . A process for the regeneration of an aqueous electrolyte solution of a redox-flow battery containing at least one inorganic redox active compound, said process comprising:
separating inorganic redox active compounds from redox active compounds other than the at least one inorganic redox active compound,
wherein the redox active compounds other than the at least one inorganic redox active compound are phenazine compounds or substituted phenazine compounds.
13 . The process according to claim 12 , wherein the at least one inorganic redox active compound is selected from a metal ion complex.
14 . The process according to claim 13 , wherein the metal ion complex is an iron metal ion complex.
15 . The process according to claim 14 , wherein the iron metal ion complex is M 3 [Fe(CN) 6 ] and M 4 [Fe(CN) 6 ], wherein M is a cation.
16 . The process according to claim 15 , wherein the cation is sodium, potassium, ammonium, or a mixture thereof.
17 . The process according to claim 12 , wherein the phenazine compounds or substituted phenazine compounds are separated from the electrolyte solution by decreasing the pH value of the solution.
18 . The process according to claim 17 , wherein the pH value is decreased to a pH of 7 or lower.
19 . The process according to claim 18 , wherein the pH value is decreased to a pH of 3.5 or lower.
20 . The process according to claim 17 , wherein the pH value is decreased using inorganic or organic acids.
21 . The process according to claim 12 , wherein the process further comprises:
removing precipitated material from the electrolyte solution and modifying the precipitated material to obtain at least one water soluble inorganic redox active compound,
wherein the subsequent modification of the precipitated material involves treatment of the precipitate with a cyanide.
Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Aug 16, 2023
From: EKKERT, OLGA; LARIONOV, EVGENY; BAAL, EDUARD
To: CMBLU ENERGY AG
Reel/Frame 064609/0119 →
Continuity (1)
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