Direct Air Capture Patents

Direct air capture (DAC) patents cover solid-sorbent capture innovations; liquid-solvent capture innovations; electrochemical and moisture-swing innovations; and contactor, regeneration, and CO2-handling innovations — with IP held by solid-sorbent leaders, liquid-solvent firms, and electrochemical-capture startups. MAJOR DAC PATENT HOLDERS: CLIMEWORKS (large solid-sorbent estate): amine-functionalized solid sorbents (amines on porous supports), temperature-vacuum-swing adsorption TVSA regeneration (~80–100°C low-grade heat + vacuum), modular collector/contactor units, and the Orca and Mammoth plants in Iceland (paired with Carbfix mineralization). CARBON ENGINEERING / OCCIDENTAL 1POINTFIVE: liquid-solvent capture (potassium-hydroxide KOH air contactor) coupled to a calcium-caustic recovery loop (pellet reactor + high-temperature calciner releasing concentrated CO2), large-scale (STRATOS megaton) design. HEIRLOOM: accelerated limestone weathering (calcium oxide/hydroxide absorbs atmospheric CO2 on trays, then calcination releases it for storage). VERDOX: electro-swing adsorption (redox-active quinone electrodes capture/release CO2 with electricity, no heat). OTHERS: Global Thermostat (amine-coated ceramic monolith), Svante (structured nano-engineered adsorbent, rapid-cycle), Mission Zero Technologies (electrochemical), Sustaera (alkali sorbent monolith), Avnos (hybrid moisture-swing, water-producing), Noya, and RepAir (electrochemical).

Solid-sorbent material and regeneration innovations; liquid-solvent and looping innovations; electrochemical and moisture-swing innovations; and capture-chemistry innovations represent core DAC patent domains — and the sorbent plus its regeneration cycle determine cost and energy, the central DAC challenge. SOLID-SORBENT PATENTS: amine-functionalized sorbents (poly(ethylenimine)/amine on silica, alumina, cellulose, or polymer supports; amine grafting/impregnation chemistry), metal-organic frameworks MOFs with open metal sites or amine-appended (high CO2 affinity at ~400 ppm), zeolites and alkali-carbonate sorbents, and humidity/oxidative stability and degradation resistance (sorbent lifetime is a key cost driver). REGENERATION PATENTS: temperature-swing TSA, temperature-vacuum-swing TVSA (Climeworks), steam-assisted regeneration, and cycle design minimizing parasitic energy. LIQUID-SOLVENT PATENTS: hydroxide (KOH/NaOH) air capture, amine solvents, and the causticization/calcium-looping recovery (slaker, pellet reactor, calciner) that concentrates CO2. ELECTROCHEMICAL PATENTS: electro-swing adsorption (quinone/redox-active electrodes — Verdox), pH-swing and bipolar-membrane electrodialysis, and moisture-swing sorbents (capture when dry, release when humid — no thermal input). Novel sorbents with high capacity, fast kinetics, low regeneration energy, and long lifetime are the highest-value DAC IP.

Air-contactor and process-design innovations; energy-minimization innovations; CO2-purification, storage, and utilization innovations; and measurement-reporting-verification innovations represent additional DAC patent domains. CONTACTOR PATENTS: air-sorbent contactor design (structured monolith, packed bed, laminar/cross-flow contactor) minimizing pressure drop and fan energy (moving huge air volumes against 400 ppm is energy-intensive), passive/convective airflow, modular collector units, and dust/weather management. ENERGY / PROCESS PATENTS: heat integration and waste-heat use, low-temperature regeneration, renewable/geothermal coupling (Climeworks uses Icelandic geothermal), and overall energy minimization (the metric that decides cost — tons CO2 per MWh, $/ton). CO2-HANDLING PATENTS: CO2 purification and compression, integration with geologic storage and mineralization (basalt injection / Carbfix), and CO2 utilization (synthetic fuels, building materials, e-fuels). MRV PATENTS: measurement, reporting, and verification methods, life-cycle accounting, and durability/permanence quantification for carbon-removal credits. PASSIVE / ENHANCED-WEATHERING PATENTS: alkaline-mineral and enhanced-rock-weathering capture, ocean alkalinity, and biochar-adjacent approaches. Low-pressure-drop contactors and low regeneration energy are the gating cost levers, so contactor and energy-integration IP directly determines DAC economics.

Direct air capture startup IP strategy must navigate Climeworks solid-sorbent and TVSA patents, Carbon Engineering liquid-solvent/calcium-looping patents, Global Thermostat and Svante sorbent estates, broad CO2-capture prior art (post-combustion amine scrubbing is decades old), and a landscape where the differentiator is capturing dilute (~400 ppm) atmospheric CO2 cheaply — so the durable IP is in novel sorbents, low-energy regeneration, low-pressure-drop contactors, and electrochemical/moisture-swing routes; understand that point-source amine capture is prior art (DAC must work at 400 ppm, not 10%+ flue gas), that sorbent + regeneration energy + contactor design decide $/ton, and that durable carbon-removal MRV is an emerging IP and market-credibility lever; identify whitespace in high-capacity humidity/oxidation-stable sorbents, electricity-driven (no-heat) capture, passive-airflow contactors, and waste-heat/renewable integration. DAC STARTUP IP STRATEGY: POINT-SOURCE CAPTURE IS PRIOR ART — DILUTE-AIR SORBENTS AND LOW-ENERGY REGENERATION ARE THE IP: amine flue-gas scrubbing is old; DAC's patentable core is sorbents and cycles that work at ~400 ppm with low parasitic energy — patent the sorbent material, its stability, and the regeneration cycle; SORBENT CAPACITY + LIFETIME + REGENERATION ENERGY DECIDE $/TON: a sorbent with high 400 ppm capacity, fast kinetics, humidity/oxidative stability, and low-temperature (or electricity-driven) regeneration is the commercial prize and strongest patent; ELECTROCHEMICAL AND MOISTURE-SWING (NO-HEAT) CAPTURE ARE HIGHEST-VALUE WHITESPACE: electro-swing (Verdox) and moisture-swing routes avoid thermal energy entirely and are the least-consolidated terrain; LOW-PRESSURE-DROP CONTACTORS AND HEAT INTEGRATION ARE OPEN: contactor designs that cut fan energy and waste-heat/geothermal coupling are active patenting; MRV IS A CREDIBILITY + IP LEVER: durable-removal measurement/verification methods underpin carbon-credit value; WHEN TO PATENT: NOVEL SORBENT/SYSTEM WITH MEASURED PERFORMANCE: file once a sorbent/system shows measured results (CO2 capacity mmol/g at 400 ppm + regeneration energy GJ/ton or kWh/ton + cycle lifetime + $/ton + capture rate) vs. Climeworks TVSA or Carbon Engineering liquid baselines — measured working capacity at 400 ppm, regeneration energy, sorbent lifetime, and cost per ton are the critical DAC IP metrics; KEY FTO CHECKLIST: Climeworks amine solid sorbent TVSA temperature-vacuum-swing modular collector; Carbon Engineering KOH liquid solvent calcium looping calciner; Heirloom limestone CaO/CaCO3 weathering; Verdox electro-swing quinone electrochemical; Global Thermostat amine monolith; Svante structured rapid-cycle adsorbent; MOF amine-appended open-metal-site; moisture-swing humidity-driven; low-pressure-drop contactor passive airflow; waste-heat/geothermal integration; Carbfix basalt mineralization; durable-removal MRV; post-combustion amine prior art.