Electrochemical Adipic Acid Synthesis — PatSnap Eureka
Electrochemical Adipic Acid Synthesis: Patent & Research Intelligence
Adipic acid is produced at approximately 3 million tonnes per year as the principal precursor to Nylon-6,6. The dominant nitric acid oxidation route generates substantial nitrous oxide emissions, driving sustained interest in electrochemical alternatives. Explore the full innovation landscape with PatSnap Eureka.
Three Overlapping Domains Define the Electrochemical Adipic Acid Innovation Space
Within this dataset, no single patent claiming direct electrochemical synthesis of adipic acid was retrieved as a primary, active filing. However, the landscape is richly populated with three overlapping technological domains: (1) electrochemical synthesis of adiponitrile (ADN) as a nylon-chain precursor immediately upstream of adipic acid; (2) catalytic and oxidative routes to adipic acid from bio-renewable feedstocks; and (3) the broader organic electrosynthesis infrastructure providing enabling reactor, catalyst, and electrolyte technologies.
The foundational industrial electrochemical step adjacent to adipic acid is the electrohydrodimerization (EHD) of acrylonitrile to adiponitrile, pioneered by E.I. du Pont de Nemours in the 1960s and scaled industrially by Asahi Kasei. Adiponitrile is hydrogenated to hexamethylenediamine (HMDA), which then reacts with adipic acid to form Nylon-6,6—placing electrochemical ADN production in direct commercial relationship with the adipic acid market.
On the heterogeneous catalysis side, cyclohexene oxidation to adipic acid over copper nanoparticle catalysts and the electrocarboxylation of organic substrates with CO₂ represent the two primary chemical mechanism clusters. The World Intellectual Property Organization (WIPO) tracks electrochemical synthesis as a growing area of green chemistry patent activity globally.
The dataset also reveals emerging paired electrolysis strategies that simultaneously valorize bio-derived feedstocks (e.g., 5-hydroxymethylfurfural, HMF) at the anode while driving reductive dimerization at the cathode—offering a conceptual template for adipic acid electrosynthesis with improved energy economics.
Patent & Research Activity: Geographic Distribution and Innovation Clusters
Visualising the assignee landscape and technology cluster maturity across the electrochemical adipic acid synthesis dataset retrieved via PatSnap Eureka.
Geographic Research Activity by Institution Count (2019–2023)
China leads the contemporary research cluster with 4 active academic institutions contributing directly relevant electrosynthesis literature in 2019–2023.
Technology Cluster Distribution in Dataset
Four primary innovation clusters identified: EHD/ADN electrochemistry, paired electrolysis, heterogeneous catalysis, and biosynthetic routes.
Four Innovation Clusters Shaping Electrochemical Adipic Acid Synthesis
From foundational EHD patents to contemporary paired electrolysis and biosynthetic competition, each cluster carries distinct IP and commercial implications.
Electrohydrodimerization (EHD) of Acrylonitrile to Adiponitrile
The most industrially proven electrochemical route adjacent to adipic acid is the cathodic reductive coupling of acrylonitrile to adiponitrile. Du Pont's foundational patents established that passing direct current through acrylonitrile-containing electrolytes—using lithium bromide or quaternary ammonium salts as supporting electrolytes—drives selective C–C bond formation at the cathode. Asahi Kasei extended this to an emulsion-phase process that achieves greater than 92% ADN selectivity in continuous operation. ADN is the direct precursor to HMDA; combined with adipic acid, it produces Nylon-6,6.
>92% ADN selectivity · Asahi Kasei emulsion-phasePaired Electrolysis with Bio-Derived Feedstocks
The 2022 Dalian University of Technology work introduces a conceptually transformative approach: replacing the energetically wasteful oxygen evolution reaction (OER) at the anode with a productive oxidation reaction (HMF → FDCA), while maintaining cathodic ADN production. The NiMoP film catalyst on nickel foam selectively catalyzes HMF oxidation by enlarging the electrochemically active surface area (ECSA) via in situ Mo and P removal. This paired cell architecture simultaneously produces two high-value nylon/polyester precursors, improving overall energy economics.
NiMoP/Ni foam · HMF → FDCA anode · ADN cathodeHeterogeneous Catalytic Oxidation of Cyclohexene to Adipic Acid
While not strictly electrochemical, the oxidative route from cyclohexene using green oxidants (H₂O₂) over copper nanoparticle catalysts on hybrid polymer/TiO₂ supports represents the current state of the art in non-electrochemical but electrocatalysis-adjacent adipic acid synthesis. Gujarat University's work demonstrates selective liquid-phase oxidation with recyclable catalysts, providing a benchmark for what electrochemical oxidation routes must compete against on selectivity and atom efficiency. The PatSnap chemicals intelligence platform tracks this catalyst literature in depth.
CuNPs / PLA-TiO₂ · H₂O₂ oxidant · recyclableElectrocarboxylation and Enabling Electrosynthesis Platforms
The electrocarboxylation framework—fixing CO₂ onto organic substrates to form carboxylic acids—is identified as a mechanistically relevant pathway for adipic acid electrosynthesis. The KU Leuven review (2014) describes CO₂ electrocarboxylation of diverse substrates, with mechanistic considerations applicable to the synthesis of six-carbon diacids. The Johannes Gutenberg University paper (2021) identifies principal component analysis, machine learning, and design of experiment (DoE) as emerging tools for electrosynthesis parameter optimisation—directly applicable to adipic acid electrosynthesis route development. The US Environmental Protection Agency has identified electrocarboxylation as a green chemistry priority.
CO₂ fixation · ML optimisation · DoE · PCAKey Filings and Publications: 1944 to 2023
A chronological map of the most significant patent and literature records in the electrochemical adipic acid synthesis dataset, from the earliest dicarboxylic acid electrolysis filing to the most recent active EP patent.
| Year | Era | Assignee / Institution | Title / Subject | Jurisdiction | Significance |
|---|---|---|---|---|---|
| 1944 | Foundational | Yoshitaro Takayama | Electrolytic production of succinic acid from tetrahydrofurfuryl alcohol | US | First electrochemical dicarboxylic acid patent from bio-derived feedstock |
| 1968 | Foundational | Asahi Kasei | Process for electrolytic production of adiponitrile | AU | Industrial EHD process filing by Asahi Kasei |
| 1969 | Foundational | E.I. du Pont de Nemours | Electrolytic production of adiponitrile | US | Seminal EHD patent establishing C–C coupling at cathode |
| 1970 | Foundational | E.I. du Pont de Nemours | Electrolytic production of adiponitrile | US | Second Du Pont EHD patent; QAS supporting electrolyte system |
| 1971 | Foundational | Asahi Kasei | Adiponitrile production by electrolytic hydrodimerization of acrylonitrile | US | Emulsion-phase EHD process; >92% ADN selectivity in continuous operation |
| 1985 | Intermediate | Monsanto Chemical Company | Improved process for recovery of adipic acid precursors | AU | KA oil route process engineering; reflects optimisation rather than electrochemical innovation |
| 1998 | Intermediate | DSM | Novel biological process for obtaining 7-ADC acid | EP | Adipate feedstock in cephalosporin antibiotic intermediate synthesis |
| 2002 | Intermediate | Gist-Brocades B.V. | Adipoyl-7-aminodeacetylcephalosporanic acid | EP | Pharmaceutical adipate derivative; secondary demand signal for high-purity adipic acid |
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Four Strategic Signals from the 2020–2023 Literature Cluster
The most recent filings and publications identify structural shifts in electrochemical adipic acid synthesis strategy, from paired cell architecture to machine learning optimisation.
Paired Electrolysis Cell Architecture (2022)
The Dalian University of Technology paired electrolysis paper represents a structural shift from single-product electrochemical cells toward dual-product systems where both anode and cathode generate commercial value. The NiMoP/nickel foam catalyst system demonstrates that non-noble metal electrocatalysts can drive selective biomass oxidation at scale. If adapted to produce adipic acid at the anode via HMF or cyclohexanone oxidation, this architecture would fundamentally improve the economics of electrochemical adipic acid synthesis.
Biosynthetic Pathways as Competitive Pressure (2022–2023)
The Beijing University of Chemical Technology review (2022) and the University of Toronto's active EP patent (2023) signal that engineered microbial platforms—particularly the reverse degradation pathway—are achieving the highest reported titers of bio-adipic acid. Electrochemical synthesis must compete on energy intensity, selectivity, and capital cost against these improving biological alternatives. IP strategists should monitor biosynthetic adipic acid patent filings as indicators of market trajectory and potential licensing opportunities. PatSnap life sciences intelligence tracks these biosynthetic patent families.
Where Electrochemical Adipic Acid Synthesis Creates Commercial Value
The primary commercial driver for adipic acid synthesis innovation—electrochemical or otherwise—is the Nylon-6,6 industry. In this dataset, ADN EHD patents from Du Pont and Asahi Kasei are explicitly targeted at producing the HMDA precursor for Nylon-6,6, with adipic acid as the co-monomer. The 2020 China University of Petroleum review confirms that the nylon industry accounts for the dominant share of global adipic acid demand.
The Flemish Institute for Technological Research (VITO) review on Electrosynthesis of Biobased Chemicals Using Carbohydrates as a Feedstock (2020) identifies electrosynthesis as a pathway for converting carbohydrate biomass into commodity dicarboxylic acids—directly relevant to bio-based adipic acid. The FDCA/ADN paired electrolysis work from Dalian connects adipic acid chemistry to the growing bio-PEF/bio-Nylon material platform designed to displace PET and conventional Nylon. The OECD has highlighted bio-based dicarboxylic acids as a priority target for sustainable chemistry transition.
Adipic acid and its derivatives also appear in pharmaceutical manufacturing: the GIST-Brocades EP patent (2002) and DSM's process (1998) both use adipate feedstocks in cephalosporin antibiotic intermediate synthesis, creating a secondary demand signal for high-purity adipic acid beyond the nylon sector.
The techno-economic assessment literature from Cambridge (CARES Singapore, 2021) signals that the chemical industry is evaluating electrochemical adipic acid synthesis in the context of carbon capture utilization (CCU) strategies. If CO₂ can be electrochemically fixed into six-carbon diacid frameworks—as the KU Leuven electrocarboxylation review suggests is mechanistically feasible—this positions adipic acid electrosynthesis as a CCU target product. The International Energy Agency tracks CCU electrochemical routes as part of its net-zero industrial scenarios. Access the PatSnap platform for deeper CCU patent analytics.
What the Electrochemical Adipic Acid Landscape Means for R&D and IP Teams
Five actionable intelligence signals derived from patent and literature analysis in the PatSnap Eureka dataset.
White Space in Direct Electrochemical Adipic Acid Patents
No active patent specifically claiming direct electrochemical synthesis of adipic acid was retrieved in this dataset. This represents a potential white space for IP development—particularly for anodic oxidation routes from cyclohexanone, cyclohexanol, or HMF using non-noble metal electrocatalysts in flow cell architectures. Teams with IP analytics capabilities are best positioned to claim this space.
Anodic oxidation · flow cell · non-noble metalPaired Electrolysis as the Most Promising Near-Term Architecture
The Dalian University paired electrolysis framework (ADN + FDCA co-production) provides a commercially attractive template. R&D teams should evaluate whether analogous cell designs—oxidizing cyclohexanone or glucaric acid at the anode to yield adipic acid directly—can achieve the selectivity and current density thresholds required for scale-up.
ADN + FDCA co-production · anode design · scale-upBiosynthetic Competition is Real and Accelerating
The University of Toronto's active EP patent (2023) and the Beijing University of Chemical Technology review (2022) confirm that engineered microbial platforms are the primary competitive threat to electrochemical routes. IP strategists should monitor biosynthetic adipic acid patent filings as indicators of market trajectory and potential licensing opportunities. Use the PatSnap API to automate patent monitoring workflows.
Reverse degradation pathway · bio-adipic acid titersChina is the Dominant Academic Research Jurisdiction
With multiple major universities publishing relevant enabling technology literature in 2020–2023, Chinese institutions are well-positioned to translate academic electrosynthesis advances into industrial patents. Western IP strategists should track Chinese publication-to-patent conversion rates in the C6 dicarboxylic acid electrochemistry space. The China National Intellectual Property Administration (CNIPA) is the key filing jurisdiction to monitor.
Dalian · Beijing Normal · China U of PetroleumElectrochemical Adipic Acid Synthesis — key questions answered
The dominant petrochemical route is nitric acid oxidation of cyclohexanol/cyclohexanone (KA oil). It generates substantial nitrous oxide emissions and relies entirely on fossil feedstocks, driving sustained interest in electrochemical and biocatalytic alternatives.
EHD is the electrochemical reductive coupling of acrylonitrile to adiponitrile (ADN), pioneered by E.I. du Pont de Nemours in the 1960s and scaled industrially by Asahi Kasei. Adiponitrile is hydrogenated to hexamethylenediamine (HMDA), which then reacts with adipic acid to form Nylon-6,6—placing electrochemical ADN production in direct commercial relationship with the adipic acid market. Asahi Kasei's emulsion-phase process achieves greater than 92% ADN selectivity in continuous operation.
Paired electrolysis replaces the energetically wasteful oxygen evolution reaction (OER) at the anode with a productive oxidation reaction. The 2022 Dalian University of Technology work demonstrates that HMF is oxidized to 2,5-furandicarboxylic acid (FDCA) at the anode while acrylonitrile is reduced to ADN at the cathode, simultaneously producing two high-value nylon/polyester precursors. This architecture directly models how an electrochemical cell could be designed to produce adipic acid or its precursors at one electrode while valorizing biomass-derived substrates at the other, improving overall energy economics.
In this dataset, no active patent specifically claiming direct electrochemical synthesis of adipic acid was retrieved. This represents a potential white space for IP development—particularly for anodic oxidation routes from cyclohexanone, cyclohexanol, or HMF using non-noble metal electrocatalysts in flow cell architectures.
The Beijing University of Chemical Technology review (2022) and the University of Toronto's active EP patent (2023) confirm that engineered microbial platforms—particularly the reverse degradation pathway—are achieving the highest reported titers of bio-adipic acid. Electrochemical synthesis must compete on energy intensity, selectivity, and capital cost against these improving biological alternatives.
China is the dominant contemporary research jurisdiction in this dataset. Dalian University of Technology (2022), China University of Petroleum (2020), Beijing University of Chemical Technology (2022), and Beijing Normal University (2022) all contribute directly relevant literature. Chinese institutions dominate the 2019–2023 electrosynthesis enabling technology literature cluster. The United States was historically dominant in foundational EHD patents through Du Pont and Monsanto.
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References
- Paired Electrolysis of Acrylonitrile and 5-Hydroxymethylfurfural for Simultaneous Generation of Adiponitrile and 2,5-Furandicarboxylic Acid — Dalian University of Technology, 2022, CN
- Research Progress on the Construction of Artificial Pathways for the Biosynthesis of Adipic Acid by Engineered Microbes — Beijing University of Chemical Technology, 2022, CN
- Recent Progress in Adipic Acid Synthesis Over Heterogeneous Catalysts — China University of Petroleum, 2020, CN
- Selective oxidation of cyclohexene to adipic acid over CuNPs supported on PLA/TiO₂ — Gujarat University, 2022
- Process and microorganism for synthesis of adipic acid from carboxylic acids — The Governing Council of the University of Toronto, 2023, EP
- Electrolytic production of adiponitrile — E.I. du Pont de Nemours & Co., 1969, US
- Electrolytic production of adiponitrile — E.I. du Pont de Nemours & Co., 1970, US
- Adiponitrile production by the electrolytic hydrodimerization of acrylonitrile — Asahi Kasei Kogyo KK, 1971, US
- Process for the electrolytic production of adiponitrile — Asahi Kasei Kogyo Kabushiki Kaisha, 1968, AU
- Electrocarboxylation: towards sustainable and efficient synthesis of valuable carboxylic acids — KU Leuven, 2014, BE
- Prospects of Value-Added Chemicals and Hydrogen via Electrolysis — University of Duisburg-Essen, 2020, DE
- Recent progress in cathodic reduction-enabled organic electrosynthesis: Trends, challenges, and opportunities — Beijing Normal University, 2022, CN
- Electrosynthetic Screening and Modern Optimization Strategies for Electrosynthesis of Highly Value-Added Products — Johannes Gutenberg University Mainz, 2021, DE
- Electrosynthesis of Biobased Chemicals Using Carbohydrates as a Feedstock — Flemish Institute for Technological Research (VITO), 2020, BE
- Electrolytic production of succinic acid — Yoshitaro Takayama, 1944, US
- Biological methods for the preparation of adipic acid — Verdezyne, Inc., 2016, BR
- Improved process for recovery of adipic acid precursors — Monsanto Chemical Company, 1985, AU
- Strategies for heterogeneous small-molecule electrosynthesis — Université de Montréal, 2021
- Techno-economic assessment of emerging CO₂ electrolysis technologies — Cambridge Centre for Advanced Research and Education in Singapore (CARES), 2021
- Adipoyl-7-aminodeacetylcephalosporanic acid — Gist-Brocades B.V., 2002, EP
- World Intellectual Property Organization (WIPO) — Green chemistry patent activity tracking
- Organisation for Economic Co-operation and Development (OECD) — Bio-based dicarboxylic acids and sustainable chemistry
- International Energy Agency (IEA) — CCU electrochemical routes and net-zero industrial scenarios
- US Environmental Protection Agency (EPA) — Green chemistry and electrocarboxylation priorities
- China National Intellectual Property Administration (CNIPA) — Chinese patent filings in C6 dicarboxylic acid electrochemistry
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 retrieved via PatSnap Eureka 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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