Bunker Fuel Desulfurization Patents 2026 — PatSnap Eureka
Bunker Fuel Desulfurization Patent Landscape 2026
IMO 2020’s 0.50 wt% sulfur cap has triggered a contested multi-technology patent race spanning hydrotreatment, blending stability, on-board pretreatment, and bio-blending. This dataset covers filings from 1992 to 2026 across 10+ major assignees.
Six Competing Approaches to Marine Fuel Desulfurization
Bunker fuel desulfurization encompasses all processes reducing sulfur in heavy marine fuel oils — HFO, VLSFO, HSFO — to meet MARPOL Annex VI and IMO 2020 mandates. The IMO 2020 regulation caps sulfur at 0.50 wt% globally, with stricter 0.10 wt% limits inside Emission Control Areas (ECAs) covering EU, North American, Baltic, and North Sea zones.
Six broad technical mechanisms are represented in this dataset: catalytic hydrodesulfurization of vacuum gas oil and vacuum residue; fuel blending and asphaltene compatibility engineering; pre-combustion in-line liquid desulfurization agent injection; oxidative desulfurization using H₂O₂ with deep eutectic solvents; biocatalytic C–S bond cleavage via Rhodococcus rhodochrous; and deasphalting combined with multi-stage physical treatment.
The foundational era (1992–1999) was dominated by biocatalytic patents from Energy Biosystems Corporation, Enchira Biotechnology Corporation, and Verenium Corporation across US, WO, AU, EP, CA, HK, and IN jurisdictions. The pre-IMO 2020 preparation window (2008–2018) saw ExxonMobil file a sustained multi-jurisdictional hydrotreatment portfolio, while Lowcarbon Co., Ltd. and Marathon Petroleum led the 2019–2022 implementation burst.
The most recent signals (2023–2026) include Saudi Arabian Oil Company’s synthetic crude-derived marine fuel process, Chevron Belgium BV’s FAME bio-blend bunker composition claiming up to 30 vol% fatty acid alkyl esters, SK Innovation’s hypo-treated residue variant, and Magema Technology’s combined desulfurization plus detrimental solids removal system targeting ISO 8217 Table 2 compliance (≤0.5 wt% S, ≤60 mg/kg solids).
Patent Activity Across Technology Clusters and Time Periods
Filing activity in this dataset spans four distinct periods: a biocatalytic foundational era (1992–1999), a transition phase (2008–2018), an IMO 2020 implementation burst (2019–2022), and current emerging signals (2023–2026). Hydrotreatment and blending stability dominate by volume, while on-board pretreatment and bio-blending represent the fastest-growing recent clusters.
Patent Filings by Technology Cluster — Bunker Fuel Desulfurization Dataset
Hydrotreatment-based low-sulfur fuel production leads with the most filings, followed by blending and stability engineering and biocatalytic/oxidative approaches.
↗ Click bars to exploreFiling Activity by Era — Bunker Fuel Desulfurization Dataset
The IMO 2020 implementation burst (2019–2022) produced the highest filing concentration in the dataset, with emerging signals continuing through 2026.
↗ Click bars to exploreKey Marine Fuel Application Domains Across Global Jurisdictions
Patent filings in this dataset address four distinct application domains: deep-sea IMO 2020 compliance, ECA and port operations, petroleum refinery fuel manufacturing, and emerging biofuels integration. Each domain is anchored to specific named assignees and regulatory contexts from the dataset.
Deep-Sea & International Shipping
The primary driver of nearly all filings in the dataset is compliance with the IMO 2020 global sulfur cap of 0.50 wt% and MARPOL Annex VI for ocean-going vessels. ExxonMobil, Neste OYJ, Marathon Petroleum, Indian Oil Corporation, IFPEN, Magema Technology, and PetroChina all explicitly reference IMO 2020 and ISO 8217 compliance in their filings. PetroChina’s 2021 SG patent targets residual marine fuel oil manufacturing for this same regulatory context.
Regulatory ComplianceEmission Control Areas & Ports
Stricter 0.10 wt% ECA limits in EU, North American, Baltic, and North Sea zones drive a distinct sub-segment. Neste OYJ explicitly addresses EU ECA requirements. Lowcarbon Co., Ltd.’s port fuel desulfurization agent mixing system (JP 2023) directly targets harbor-side fuel treatment. The in-transit desulfurization concept from Intelligent Energy, Inc. (US 2008–2009) describes switching between high-sulfur open-ocean fuel and low-sulfur processed fuel upon entering restricted areas.
In-Port TreatmentPetroleum Refining & Fuel Manufacturing
Indian Oil Corporation Limited’s MARPOL-compliant bunker fuel process and IFPEN’s vacuum residue transformation scheme are designed to integrate into existing refinery units — FCC, delayed coking, and hydrotreater — creating operational flexibility for refiners serving the marine fuel market. Indian Oil’s process adds a paraffin separation section to generate higher-aromatic, lower-paraffin cutter stocks that resist asphaltene precipitation, as documented in its 2021 and 2022 US filings.
Refinery ProcessingBiofuels Integration Marine Bunkers
Chevron Belgium BV’s 2026 US filing claims a marine bunker composition containing 1–30 vol% fatty acid alkyl esters blended with a petroleum resid-based fuel oil meeting ISO 8217-2017 Table 2 — the first bio-blend bunker composition patent in this dataset. Saudi Arabian Oil Company’s 2024 WO and US filings describe producing IMO-compliant marine fuel directly from a synthetic crude feed stream, bypassing conventional heavy residue sources.
Bio-Blend FuelsLeading Assignees in the Bunker Fuel Desulfurization Patent Landscape
Innovation is moderately concentrated across this dataset. Three legacy players — the Energy Biosystems group, ExxonMobil Research and Engineering Company, and Marathon Petroleum Company LP — account for the majority of historical filings, while Lowcarbon Co., Ltd. leads the most active current filing cluster with an ongoing PCT-to-national stage family.
Top Assignees by Filing Count — Bunker Fuel Desulfurization Dataset
↗ Click bars to exploreExxonMobil Research and Engineering
ExxonMobil Research and Engineering Company holds approximately 11 filings in this dataset spanning WO (2016), CA (2016), AU (2017–2019), EP (2017–2020), and US (2016–2019) jurisdictions. Their core technology emphasizes uncracked hydrotreated vacuum resid as the primary blendstock for VLSFO, explicitly avoiding cracked components to preserve fuel energy density. Multiple US and EP patents remain active, covering low-sulfur marine bunker fuel compositions and associated production methods.
United StatesLowcarbon Co., Ltd.
Lowcarbon Co., Ltd. holds approximately 9 filings in this dataset, originating from a KR 2019 priority and PCT/KR2020/012548, /12551, /12552 families with national stage entries in US, SG, EP, and JP. Their technology injects a liquid desulfurization agent into the marine fuel supply line via a metering pump, with a companion control and monitoring system for real-time dosing adjustment. US grants were received in 2024 and SG extension continued to 2025.
Korea — KRFive Directional Shifts in Bunker Fuel Desulfurization (2023–2026)
The most recent filings in this dataset (2023–2026) signal a transition from sulfur-only compliance toward combined desulfurization, solids management, alternative feedstocks, and decarbonization pathways. Five distinct directional shifts are identifiable from named assignee filings.
Synthetic Crude-Derived Marine Fuel
Saudi Arabian Oil Company’s 2024 WO and US filings describe producing IMO-compliant marine fuel directly from a synthetic crude feed stream, bypassing conventional heavy residue sources. This represents a structural shift in feedstock strategy that could alter the competitive dynamics of VLSFO production. No prior filings on synthetic crude-derived marine bunker fuel appear in this dataset.
FAME Bio-Blend Bunker Compositions
Chevron Belgium BV’s 2026 US filing claims a marine bunker composition with 1–30 vol% fatty acid alkyl esters alongside a petroleum resid-based fuel oil meeting ISO 8217-2017 Table 2, marking the first bio-blend bunker composition patent in this dataset. This filing signals that decarbonization-driven bio-blending is entering the marine bunker IP space ahead of anticipated post-2030 regulatory requirements.
Hydrotreatment vs. On-Board Pretreatment: Two Competing Compliance Routes
Click any row to explore further.
| Dimension | Hydrotreatment-Based (Refinery-Side) | On-Board Pretreatment (Lowcarbon) |
|---|---|---|
| Lead Assignees | ExxonMobil, IFPEN, Neste OYJ, Indian Oil, Marathon Petroleum | Lowcarbon Co., Ltd. |
| Filing Count in Dataset | ~18 filings across all hydrotreatment assignees | ~9 filings (PCT/KR2020/012548, /12551, /12552 families) |
| Primary Jurisdictions | US, WO, EP, AU, CA | US, SG, EP, JP, KR |
| Sulfur Target | ≤0.50 wt% S (VLSFO); some targeting ≤0.10 wt% S for ECAs | Sulfur oxides adsorbed in situ during combustion |
| Mechanism | Catalytic HDS of vacuum gas oil or vacuum resid; blending with low-S cutter stocks | Liquid desulfurization agent injected into fuel supply line via metering pump; agent dosing adjusted in real time |
| Where Treatment Occurs | Refinery, prior to fuel delivery | On-board vessel, in-line before marine engine combustion |
| Key Standards Referenced | IMO 2020, MARPOL Annex VI, ISO 8217 | MARPOL Annex VI (sulfur emissions compliance) |
| Most Recent Filing | SK Innovation SG 2025 (hypo-treated residue); Magema US 2026 (solids removal) | Lowcarbon SG 2025; Lowcarbon US 2024 (control and monitoring system) |
Frequently Asked Questions: Bunker Fuel Desulfurization Patents
IMO 2020 caps sulfur content in marine fuel oil at 0.50 wt% globally under MARPOL Annex VI. Stricter limits of 0.10 wt% apply inside Emission Control Areas (ECAs), which include EU, North American, Baltic, and North Sea zones.
The Energy Biosystems Corporation / Enchira / Verenium group leads with approximately 15 family filings, followed by ExxonMobil Research and Engineering Company (~11), Marathon Petroleum Company LP (~9), and Lowcarbon Co., Ltd. (~9). Indian Oil Corporation Limited, Neste OYJ, and IFPEN also appear as named assignees.
On-board pretreatment involves injecting a liquid desulfurization agent into the marine fuel supply line in a controlled ratio using a metering pump before combustion. Sulfur oxides generated are adsorbed and removed in situ. Lowcarbon Co., Ltd. (Korea) holds the key patents, originating from PCT/KR2020/012548, /12551, /12552 families with active grants in the US (2024) and SG (2025).
Singapore is the world’s largest bunkering hub. PetroChina, Lowcarbon Co., Ltd., Neste OYJ, and SK Innovation all use SG as a national-stage jurisdiction in their bunker fuel patent families, reflecting Singapore’s commercial significance for marine fuel supply and regulatory compliance.
The 2023–2026 signals include: Saudi Arabian Oil Company’s synthetic crude-derived marine fuel (2024 WO/US); Chevron Belgium BV’s fatty acid alkyl ester bio-blend bunker composition with up to 30 vol% FAME (2026 US); SK Innovation’s hypo-treated residue VLSFO process (2025 SG); Magema Technology’s combined desulfurization and detrimental solids removal unit targeting ≤0.5 wt% S and ≤60 mg/kg solids (2026 US); and academic signals on deep eutectic solvent ODS for commercial HFO (2023).
Biocatalytic desulfurization (BDS) uses microorganisms — notably Rhodococcus rhodochrous ATCC 53968 — to selectively cleave C–S bonds in HDS-refractory aromatic heterocycles like dibenzothiophene, achieving residual sulfur below 0.05 wt%. Foundational patents were filed by Energy Biosystems Corporation, Enchira Biotechnology Corporation, and Verenium Corporation from 1992 to 1997. This biocatalytic cluster is largely inactive in terms of current legal status but remains foundational for deep desulfurization research.
Data and insights on this page are based on a limited patent and literature dataset and are for reference only. Figures may not represent the complete technology landscape.