NGL Fractionation Patents: Who Leads, Where the Gaps Are 2026
- One filer holds a visible lead of 28 records against a field where fifth place sits at 6 and tenth at 1 — a steep drop from the top rather than a tight cluster.
- Filing peaked in 2023 at 25 records after starting from zero in 2017, though the most recent year is understated because publication trails filing by around 18 months.
- C10G and C07C classes each cover roughly half the corpus (47.1% and 44.1% of the 68 records respectively), showing fractionation claims are filed as refining and compound chemistry, not as standalone separation hardware.
What this patent landscape covers
Fractionation of natural gas liquids splits a mixed NGL stream into ethane, propane, butanes and heavier fractions using columns such as deethanizers, depropanizers and butane splitters. The engineering problems that attract patent filings sit around the column internals and its operating envelope: valve tray design, reflux ratio optimisation, bottoms product composition control, reboiler fouling and column pressure control. This search scopes the field to 68 published records spanning 2015 to 2026 that combine a fractionation unit term with one of these operating or control concepts.
The dataset sits at the intersection of hydrocarbon refining process claims and separation-equipment claims, which is why the same records surface under both refining-oriented and equipment-oriented IPC subclasses. That overlap matters for freedom-to-operate work: a column-hardware filing can still infringe on a refining-process claim covering the same reflux or bottoms-composition control step.
Filing trend and technology composition
The two views below use different denominators: the trend chart counts records by publication year, while the IPC chart counts records by subclass against the full 68-record base — since a record can carry more than one class, the class shares add up to more than 100%.
Filing activity, 2017-2026
Filings run from zero in 2017 up to a peak of 25 records in 2023, with 2026 showing only 1 record so far — expected, since publication lags filing by roughly 18 months and the most recent year is always the least complete.
IPC subclass composition
C10G (hydrocarbon oils and refining) and C07C (acyclic and carbocyclic compounds) each anchor close to half the corpus, with B01D separation processes and F25J gas liquefaction trailing well behind — evidence that fractionation claims are drafted more often as process chemistry than as standalone separation apparatus.
Shares are the percentage of the 68 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Fractionation of Natural Gas Liquids with Eureka
This page is one run against one query. Ask Eureka your own question about fractionation of natural gas liquids and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited records and a representative filing
US4545895A — Fractional distillation (Phillips Petroleum Company)
Process and apparatus are provided for the recovery of low, medium and high boiling components from feed streams containing same wherein reboiler fouling, gumming and the like are minimized, via the control of fractionator reboiler temperatures.Filed 1985-10-08, this record predates the 2015 search window but anchors the reboiler-fouling control approach that later filings in this set build on or design around.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5282957A | Methods for inhibiting polymerization of hydrocarbons utilizing a hydroxyalkylhydroxylamine | 134 |
| 2 | US5746066A | Pre-fractionation of cracked gas or olefins fractionation by one or two mixed refrigerant loops and cooling w… | 77 |
| 3 | US5453559A | Hybrid condensation-absorption olefin recovery | 43 |
| 4 | US4744881A | Antioxidant material and its use | 36 |
| 5 | EP0675094A2 | Hybrid condensation-absorption olefin recovery | 25 |
| 6 | US5221461A | Antioxidant compositions and methods using catechol compounds and organic acid compounds | 24 |
| 7 | US5221498A | Methods and compositions for inhibitoring polymerization of vinyl monomers | 17 |
| 8 | US4367357A | Process for the conversion of butanes into gasoline | 17 |
| 9 | US3013093A | Alkylation process | 17 |
| 10 | US4545895A | Fractional distillation | 16 |
Citation counts accumulate over time, so older records such as the 1990s olefin-recovery and antioxidant filings dominate this list; treat the ranking as a signal of historical influence within this corpus, not of current filing activity.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three patterns stand out once the ranking, the trend and the IPC composition are read together.
One filer, then a steep drop
The leading assignee holds 28 records while fifth place holds only 6 and tenth place just 1. That gap is a cliff, not a gradual taper — a small number of firms hold most of the documented depth in this specific search scope, and the remainder file only occasionally.
Activity concentrated in the last decade
Filings were absent in 2017 and built to a peak of 25 records in 2023. With fewer than four complete years available once publication lag is accounted for, no growth rate can be stated reliably from this data.
Refining and chemistry classes dominate
C10G and C07C each cover close to half of the 68 records in scope, while control-oriented classes like G05D appear in only 7.4%. Column control logic is claimed far less often than the underlying separation chemistry.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to fractionation of natural gas liquids, with the prior art for and against each one.
Who is filing, and where the momentum sits
The ranked leaders here are a fixed set of 10 companies as returned by the data endpoint — not a top-50 or top-100 cut, and not a share of the wider field.
A single dominant filer
The top-ranked assignee holds 28 records in this set, far ahead of the rest of the ranked list. Recent-year momentum for this filer shows 1 filing in the latest year, down 50% year-on-year — a slowdown worth watching rather than a reversal.
A thin middle tier
Fifth place in the ranking sits at only 6 records, and several assignees in the recent-year momentum data show zero filings in the latest year. Momentum has cooled across most of the ranked field even where historical volume is meaningful.
Little cross-filing
Only one co-assignee pairing shows repeated joint filing, and even that pair appears together on just 2 records. Most activity in this dataset is filed by a single assignee rather than through joint ventures.
| Assignee | Recent year | YoY |
|---|---|---|
| UOP LLC | 1 | -50% |
| BetzDearborn Inc | 0 | — |
| Saudi Arabian Oil Co (Saudi Aramco) | 0 | — |
| M W Kellogg Ltd | 0 | — |
| BL Technology Inc | 0 | — |
| Phillips Petroleum Co | 0 | — |
| Aramco Services Co | 0 | — |
| ExxonMobil Technology & Engineering Co | 0 | — |
Where to take this analysis
The figures above establish scale and direction; the next step is usually a claim-level read against a specific process design.
Map claims against a specific column design
Run the deethanizer or depropanizer design you are evaluating against the highest-citation records and the representative reboiler-fouling filing to see which control steps are already claimed.
Explore in Patsnap EurekaTrack the leader's recent slowdown
The top assignee's filing pace dropped in the latest year; confirm whether that reflects a genuine pause or a publication-lag artefact before adjusting freedom-to-operate priorities.
Explore in Patsnap EurekaTest the under-claimed control branches
G05D-classed control filings are a small share of the corpus; a control-logic claim around reflux or bottoms composition may face less prior art than a hardware claim.
Explore in Patsnap EurekaCommon questions on NGL fractionation patents
Within this 68-record dataset, one assignee holds a clearly leading position with 28 records, well ahead of the rest of the ranked list where fifth place sits at only 6. That gap suggests the leader has built defensive depth around core column and process-control claims over many years. Any freedom-to-operate check in this space should start with that filer's portfolio before looking at the thinner mid-tier.
A deethanizer is a distillation column that removes ethane from a mixed NGL stream ahead of further fractionation into propane, butanes and heavier products. It attracts filings because small changes to reflux ratio, tray design or reboiler operation directly affect product purity and energy cost at commercial scale, and those operating parameters are exactly what this dataset's search terms target. Most of the corpus classifies under refining (C10G) or compound chemistry (C07C) rather than under separation-equipment classes, showing the process conditions are claimed as often as the hardware.
Filings in this dataset started from zero in 2017 and built up to a peak of 25 records in 2023, the highest single year in the covered period. The most recent years, including 2026, show very few records, but that is expected: publication typically lags filing by around 18 months, so recent activity is always undercounted at the time a search is run. A reliable growth rate cannot be calculated from this set because fewer than four complete years remain once that lag is accounted for.
Reboiler fouling refers to the build-up of deposits on reboiler surfaces in a fractionation column, which reduces heat transfer efficiency and forces higher energy input or more frequent shutdowns. It is one of the specific control problems this dataset's search terms target directly, and the representative record in this set, US4545895A, addresses it through control of fractionator reboiler temperatures to minimise fouling and gumming. Filings addressing fouling sit alongside reflux and pressure-control claims as the operational, rather than purely mechanical, side of fractionation patenting.
The IPC composition shows control-oriented classes such as G05D appearing in only 7.4% of the 68 records, far behind the refining and chemistry classes that each cover close to half the corpus. That imbalance points to control algorithms for reflux ratio, bottoms composition feedback and pressure regulation as comparatively under-claimed relative to the underlying separation chemistry. A first claim in this space would likely combine a specific sensor or feedback mechanism with a named column operating variable, rather than claiming the column hardware itself.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.