Electrochemical Desalination 2026 — PatSnap Eureka
Electrochemical Desalination: The 2026 Patent Landscape
Water scarcity is projected to affect 48% of the global population by 2025. Electrically-driven desalination — from electrodialysis to redox-flow systems — is emerging as the low-energy answer. Explore 45+ years of patent signals, key assignees, and the five emerging directions reshaping the field.
Beyond Reverse Osmosis: How Electrochemical Desalination Works
Electrochemical desalination uses applied or generated electrical potential to drive ion transport across selective membranes or into electrode materials, separating salt from water without the high pressures required by reverse osmosis (RO). The field is gaining urgency as renewable energy costs fall, making low-energy, electricity-driven desalination increasingly viable for water-stressed regions worldwide.
Within the patent dataset mapped by PatSnap's innovation analytics platform, the field resolves into five technically distinct sub-domains: Electrodialysis (ED) and Electrodialysis Reversal (EDR); Redox-Flow Desalination (RFD) / Electrochemical Desalination Battery (EDB); Reverse Electrodialysis (RED) / Salinity Gradient Power; Integrated Energy Generation + Desalination; and Hybrid Pretreatment Architectures coupling nanofiltration (NF) upstream of ED units.
The dataset spans approximately 45 years of filing activity — from 1967 (Simon-Carves Limited, GB) through pending applications dated November 2025 (Ebb Carbon, Inc., WO/US). This span reflects a technology that has moved through distinct phases, from foundational process-level patents through to convergent technologies integrating desalination with carbon removal and green hydrogen production. For life sciences and chemicals-adjacent applications, PatSnap's chemicals intelligence suite provides complementary landscape coverage.
Innovation in this dataset is not distributed broadly — it is concentrated in 4–5 assignees (PARC, Evoqua, Lynntech, MIT, KIER), with academic institutions contributing foundational device and method claims. There is a notable absence of large incumbent desalination corporations such as SUEZ or Veolia from the electrochemical-specific filings, suggesting the field remains primarily in research-commercial transition rather than dominated by established industry players.
Four Patent Clusters Defining the Field
Each cluster represents a mechanistically distinct approach to electrochemical ion separation, with different IP positions, commercialization timelines, and application domains.
Redox-Flow Electrochemical Desalination Battery (EDB)
A reversible electrochemical cell uses redox-active electrode materials — such as soluble ferrocyanide/ferricyanide electrolytes — that undergo reversible reactions with dissolved ions in saline feed water. During charging (salination mode), electrical energy is stored; during discharging (desalination mode), stored energy drives ion removal. PARC holds approximately 12–14 records across US, IL, AU, JP, KR, CN, and BR jurisdictions covering this concept. The portfolio (now held by Xerox following PARC's dissolution) represents the most comprehensive IP position in the dual-function energy storage + desalination space.
PARC / Xerox — 12–14 records, 7 jurisdictionsElectrodialysis & High-Recovery ED Cascades
A DC electric field applied across a stack of alternating cation-exchange membranes (CEM) and anion-exchange membranes (AEM) drives ionic migration from diluate compartments into concentrate compartments. In multi-stage cascades, concentrate from a downstream stage is recycled upstream, increasing overall water recovery and reducing Donnan potential losses. Evoqua Water Technologies holds the dominant operational IP position in high-recovery brackish water ED, with multi-jurisdictional coverage across CA, SG, AU, IN, and IL. The MIT ED systems (US, 2018 and 2020) contribute improved voltage regulation algorithms achieving TDS below 500 mg/L.
Evoqua — 6–7 records across 5 jurisdictionsIntegrated Energy Generation & Ion Intercalation
Intercalation-based electrodes — dimensionally stable materials that insert dissolved ions into their crystal lattice — drive both desalination and generate electrical power simultaneously. When salinity gradients are present, the intercalation reactions are reversible and exergonic in the desalination direction, enabling net energy output. Lynntech, Inc. holds 4 active US records on this integrated energy generation and desalination method. The University of Illinois (US, 2021) extends this direction with symmetric porous electrode architectures using the same intercalation active material on both electrodes.
Lynntech — 4 active US patents (2020–2022)Reverse Electrodialysis (RED) & Salinity Gradient Power
Concentration gradients between high-salinity brine (from desalination plant effluent or natural seawater) and low-salinity freshwater generate an electromotive force across ion-selective membrane stacks (RED). The generated electricity is applied to drive downstream desalination. Hybrid PRO + RED systems couple pressure-retarded osmosis with RED, maximizing energy extraction from brine-freshwater concentration differences. Korea Institute of Energy Research and Gongju National University Industry-Academic Cooperation Foundation are active in KR jurisdiction, with the Gongju 2024 filing enabling cell voltages up to 4.6 V using organic electrolytes.
KIER + Gongju National University — KR filings 2013–2024Filing Patterns & Jurisdiction Distribution
Patent data from PatSnap Eureka reveals where electrochemical desalination innovation is being protected and how filing activity has evolved across five decades.
Patent Records by Jurisdiction
Israel leads all single-country filings (~10 records), driven by PARC and Evoqua. US and KR follow with strong national programs.
Innovation Timeline — Five Filing Phases (1967–2026)
45 years of patent activity resolves into five distinct phases, from foundational freeze-crystallization predecessors to convergent OAE and hydrogen co-production filings.
Where Electrochemical Desalination Is Being Deployed
Patents in this dataset span six distinct application domains, from municipal drinking water to ocean carbon removal — each with distinct chemistry requirements and IP dynamics.
Municipal & Potable Water Production
The dominant application in this dataset is production of drinking-quality water (TDS < 500 mg/L) from brackish groundwater and seawater. MIT's ED systems (US, 2018, 2020) specifically target product water suitable for drinking. Evoqua's high-recovery ED method (filed across AU, SG, CA, IN) addresses brackish water treatment for potable supply, relevant for water-stressed regions including the Indian subcontinent.
Energy Storage + Water Co-Production
PARC's EDB concept (US, IL, AU, JP, KR, CN) is explicitly positioned as a dual-purpose grid-scale energy storage asset that also produces freshwater. The salination mode stores off-peak renewable energy; the desalination mode releases that energy during peak demand while generating freshwater. This framing is particularly relevant for arid regions with high renewable penetration — Persian Gulf, North Africa, southwestern US, Australia.
Off-Grid & Renewable-Integrated Desalination
MIT's time-variant, multi-stage EDR control system (IN, 2022) is designed specifically for solar PV-powered desalination: an outer control loop divides time-varying PV power between the EDR process and a battery based on predicted future PV availability, enabling reliable water production without a stable grid connection. This domain targets rural communities and developing regions.
Industrial Process Water & Oil/Gas
Evoqua Water Technologies (SG, 2016) filed on electrochemical desalination for oil recovery, using electrically-driven separation (ED) to produce treated water with controlled sulfate, TDS, and hardness suitable for waterflooding and tertiary oil recovery — an industrial niche with distinct chemistry requirements.
Five Forward Signals from the Latest Patent Filings
Based on filings dated 2023–2025 in this dataset, five forward signals are identifiable — each representing a distinct convergence of electrochemical desalination with adjacent technology domains.
Organic Electrolytes Enabling High-Voltage RFD
The Gongju National University RFD system expands cell voltage from the ≤1.2 V constraint of aqueous electrolyte systems to up to 4.6 V by incorporating redox organic electrolytes, significantly improving desalination performance and enabling energy recovery subsystems. This direction parallels developments in non-aqueous redox flow batteries and suggests a new generation of high-performance RFD cells.
Up to 4.6 V cell voltage — vs ≤1.2 V aqueous constraintNF Pretreatment as an ED Enabler for Seawater
Evoqua's 2024 IL filings on nanofiltration pretreatment for electrodialysis desalination represent a systems-level innovation that extends ED's viable salinity range toward full seawater (35 ppt), traditionally the exclusive domain of RO. By selectively removing divalent ions with low-pressure NF before the ED stack, scaling is controlled and energy consumption is reduced. R&D teams should evaluate where NF + ED can undercut RO energy costs (typically 3–10 kWh/m³) in specific salinity windows (approximately 5,000–20,000 mg/L TDS).
Targets 5,000–20,000 mg/L TDS — RO energy: 3–10 kWh/m³Electrochemical Desalination + Ocean Alkalinity Enhancement
Ebb Carbon's 2025 WO and US filings introduce a genuinely novel convergence: electrochemical brine processing produces acid and base streams, the base being used for ocean carbon dioxide removal. This repositions desalination brine — historically a liability — as a feedstock for carbon removal, potentially unlocking carbon credit revenue to subsidize desalination CAPEX. If OAE achieves regulatory recognition as a verified carbon removal pathway, this could dramatically change the economics of coastal electrochemical desalination. Researchers can track follow-on filings using PatSnap's landscape analytics.
Brine converted to base stream for ocean CO₂ removalWater Purification + Green Hydrogen Co-Production
Politecnico di Torino (IT, 2025) filed on an integrated system for water demineralization/purification and simultaneous hydrogen production — reflecting a broader trend in which electrochemical water treatment infrastructure is re-engineered to produce green hydrogen as a co-product, improving overall plant economics. This appears lightly contested and represents a potential white-space claim for hydrogen-economy-adjacent investors. Academic licensing or spin-out formation remains a viable market entry vector.
Lightly contested — potential white-space for H₂ investorsIP Landscape Implications for R&D and Strategy Teams
Key strategic signals derived from assignee concentration, jurisdiction coverage, and emerging white-space opportunities in the electrochemical desalination patent dataset.
| Strategic Signal | Key Assignee / Filing | Implication for R&D Teams | IP Status |
|---|---|---|---|
| EDB / Redox-Flow IP Thicket | PARC (now Xerox) — US, IL, AU, JP, KR, CN | Any entrant seeking to commercialize redox-flow desalination at grid scale must navigate this portfolio. Most records are currently inactive — creating potential licensing windows. | Mostly Inactive |
| High-Recovery Brackish Water ED | Evoqua Water Technologies — CA, SG, AU, IN, IL | R&D teams targeting South Asia and Southeast Asia should map this portfolio carefully, particularly for concentrate recycle and Donnan potential control claims. | Active |
| NF + ED Hybrid for Seawater | Evoqua Water Technologies — IL 2024 | Most commercially proximate near-term threat to RO in the medium-salinity range (approximately 5,000–20,000 mg/L TDS). Evaluate where NF + ED can undercut RO energy costs (3–10 kWh/m³). | Pending |
| OAE + Desalination Convergence | Ebb Carbon, Inc. — WO/US 2025 | Highest-uncertainty, potentially highest-value emerging direction. If OAE achieves regulatory recognition as a verified carbon removal pathway, carbon credit financing could dramatically change coastal desalination economics. | Pending |
| Academic White-Space: H₂ Co-Production | Politecnico di Torino — IT 2025 | Appears lightly contested. University licensing deals or spin-out formation remain viable market entry vectors for hydrogen-economy-adjacent investors. | New Filing |
| Intercalation Electrode Architecture | University of Illinois — US 2021 | Symmetric porous electrode architectures with alternating ion-selective membranes represent a foundational device claim. Academic licensing pathway open. | Active |
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Electrochemical Desalination — key questions answered
Electrochemical desalination uses applied or generated electrical potential to drive ion transport across selective membranes or into electrode materials, separating salt from water without the high pressures required by reverse osmosis (RO). Technologies include electrodialysis (ED), redox-flow desalination, reverse electrodialysis (RED), and capacitive deionization.
Innovation is highly concentrated. Palo Alto Research Center Incorporated (PARC) accounts for the largest share of distinct filings — approximately 12–14 records spanning US, IL, AU, JP, KR, CN, and BR jurisdictions. Evoqua Water Technologies LLC accounts for 6–7 records across ES, SG, CA, AU, IN, IL. Lynntech, Inc. holds 4 active US records on integrated energy generation and desalination. Massachusetts Institute of Technology holds 3 records (US ×2, IN).
A reversible electrochemical cell uses redox-active electrode materials (e.g., soluble redox electrolytes such as ferrocyanide/ferricyanide) that undergo reversible reactions with dissolved anions and cations in saline feed water. During charging (salination mode), electrical energy is stored; during discharging (desalination mode), stored energy drives ion removal. Ion-exchange membranes (anion-exchange and cation-exchange) separate the redox chambers from the water chamber.
IL (Israel) has the highest single-country filing count for electrochemical desalination in this dataset (~10 records), largely PARC and Evoqua filings, reflecting Israel's strategic national interest in desalination IP and its use as a PCT-equivalent filing jurisdiction.
Five forward signals are identifiable from 2023–2025 filings: (1) organic electrolytes enabling high-voltage redox flow desalination up to 4.6 V (Gongju National University, KR 2024); (2) NF pretreatment as an ED enabler for full seawater desalination (Evoqua, IL 2024); (3) electrochemical desalination plus ocean alkalinity enhancement for carbon removal (Ebb Carbon, WO/US 2025); (4) water purification plus green hydrogen co-production (Politecnico di Torino, IT 2025); (5) intelligent control systems for renewable-powered ED (MIT, IN 2022).
Water scarcity is projected to affect 48% of the global population by 2025 and renewable energy costs are falling, making low-energy, electricity-driven desalination increasingly viable. The field is gaining urgency as a result, with filings spanning from 1967 through pending applications dated November 2025.
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References
- Redox Desalination System for Clean Water Production and Energy Storage — Palo Alto Research Center Incorporated, 2015, US
- Redox Desalination System for Clean Water Production and Energy Storage — Palo Alto Research Center Incorporated, 2017, AU
- Electrochemical Desalination System with Coupled Electricity Storage — Palo Alto Research Center Incorporated, 2019, AU
- Low Energy System and Method of Desalinating Seawater — Siemens Industry, Inc., 2012, IL
- High Recovery Electrodialysis Method — Evoqua Water Technologies LLC, 2021, AU
- Nanofiltration Pretreatment of Seawater for Electrodialysis Desalination — Evoqua Water Technologies LLC, 2024, IL
- Integrated Energy Generation and Desalination System and Method — Lynntech, Inc., 2020, US
- Integrated Energy Generation and Desalination System and Method — Lynntech, Inc., 2020, US
- Integrated Energy Generation and Desalination System and Method — Lynntech, Inc., 2022, US
- Method and System for Desalinating Saltwater While Generating Electricity — Tang, James Hing Bong, 2011, WO
- Hybrid Salinity Gradient Power Generation System — Korea Institute of Energy Research, 2015, KR
- Energy Recovery Type Redox Flow Desalination System — Gongju National University Industry-Academic Cooperation Foundation, 2024, KR
- Integrated Ocean Alkalinity Enhancement and Seawater Desalination — Ebb Carbon, Inc., 2025, US
- Integrated Ocean Alkalinity Enhancement and Seawater Desalination — Ebb Carbon, Inc., 2025, WO
- Integrated System for the Demineralization and/or Purification of Water and for the Simultaneous Production of Hydrogen — Politecnico di Torino, 2025, IT
- Time-Variant, Multi-Stage Control System — Massachusetts Institute of Technology, 2022, IN
- World Intellectual Property Organization (WIPO) — PCT Filing System and Global Patent Database
- U.S. Department of Energy — Desalination and Water Purification Research Program
- International Energy Agency (IEA) — Green Hydrogen and Renewable Energy Integration Reports
All data and statistics on this page are sourced from the references above and from PatSnap's proprietary innovation intelligence platform. This landscape is derived from a targeted set of patent and literature records and represents a snapshot of innovation signals within this dataset only — it should not be interpreted as a comprehensive view of the full industry.
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