What is Isobutene
Analysts Sentiment
Bullish
30.2%
Neutral
40.4%
Bearish
29.4%
What's driving sentiment this week:
Past Week (2026-06-01 to 2026-06-08) — Sentiment: Neutral
Supply-side conditions remain stable with no new disruptions or capacity changes reported through June 8.
Demand factors show no shifts as Q1 2026 spot prices from March continue to serve as the prevailing market reference.
Geopolitical and macroeconomic variables have not introduced any new volatility or directional bias this past week.
This Week (2026-06-08 to 2026-06-15) — Outlook: Neutral
Market momentum is expected to remain range-bound absent fresh catalysts impacting supply or demand dynamics.
The key focus remains on visibility into second quarter pricing data, currently unconfirmed, which could reset sentiment once released.
A sudden supply disruption or unexpected demand surge could swiftly overturn the current neutral stance.
Key Market Impact
Price and margin levels are largely anchored by stagnant spot price references and balanced supply-demand cues.
Market participants are likely to maintain existing positions and await new fundamental signals before shifting exposure.
How About the Price?
Price Trajectory 2020–2026 (Brief Recap)
Phase 1 — Initial Volatility (2020): Prices started at $800.0 USD/ton in January 2020, experienced a peak at $850.0 USD/ton in March 2020, then declined to $580.0 USD/ton by December 2020; no specific supply-demand events were recorded in the influence log during this period.
Phase 2 — Gradual Downtrend (2021): Prices declined steadily from $620.0 USD/ton in January 2021 to $570.0 USD/ton in December 2021, with no noted influence factors marking this gradual reduction.
Phase 3 — Accelerated Decline (2022): Prices fell consistently from $550.0 USD/ton in January 2022 to $330.0 USD/ton in December 2022, with the influence log remaining empty for factors during this persistent downward trend.
Phase 4 — Persistent Fall to Historic Lows (2023 to mid-2025): Prices declined markedly from $310.0 USD/ton in January 2023 to as low as $5.0 USD/ton in October 2025, with a small upward correction in November–December 2025; the influence log does not record events explaining this steep fall.
Phase 5 — Early Signs of Recovery (late 2025 to early 2026): Prices rose slightly from $5.0 USD/ton in October 2025 to $18.0 USD/ton in May 2026, signaling a minor recovery phase; no influence factors were recorded to clarify this change.
Supply-side factors
- No recorded supply-side factors or events from January 2020 through May 2026 in the influence log for isobutene.
Demand-side factors
- No recorded demand-side factors or events from January 2020 through May 2026 in the influence log for isobutene.
Substitutes & Alternatives
| Substitute | Replacement Scenario / How It Substitutes |
|---|---|
| 1-Butene | In polymerization applications (e.g., as a comonomer in polyethylene production), 1-butene can partially substitute isobutene where branching requirements are less strict. It is not a drop-in replacement for applications requiring the tertiary carbon structure of isobutene (e.g., butyl rubber), but is used interchangeably in some alkylation feedstocks. |
| 2-Butene (cis and trans) | In refinery alkylation units producing isooctane (alkylate gasoline), 2-butenes can substitute isobutene as the olefin feed reacted with isobutane over acid catalysts. The alkylate octane number differs slightly, but 2-butenes are a practical and common alternative feedstock in the same unit. |
| Propylene | In the production of certain antioxidants and fuel additives, propylene-based alkylation products (e.g., propylene oligomers) can substitute isobutene-derived alkylphenol antioxidants in some lubricant and fuel additive formulations, though performance profiles differ and reformulation is required. |
| Isoamylenes (C5 olefins) | In MTBE/ETBE production, isoamylenes (2-methyl-1-butene and 2-methyl-2-butene) from FCC C5 streams can react with methanol or ethanol to form TAME (tert-amyl methyl ether) or TAEE, which serve as direct octane-boosting fuel oxygenate substitutes for MTBE derived from isobutene. This is a partial substitution in the fuel blending context. |
| Ethylene / Propylene (for PIB substitution) | In sealant, adhesive, and lubricant additive applications where polyisobutylene (PIB) is used, ethylene-propylene copolymers (EPM/EPDM) or polyalphaolefins (PAO) can substitute PIB in viscosity modification and sealant roles, though they require reformulation and do not replicate PIB's gas-barrier properties. |
| Tert-Butyl Alcohol (TBA) | TBA can serve as a direct chemical precursor substitute for isobutene in several downstream syntheses (e.g., production of methacrolein, methacrylic acid, or MTBE), since TBA readily dehydrates to isobutene in situ under acid catalysis. In some process designs, TBA is the preferred feedstock rather than gaseous isobutene for handling and safety reasons. |
| Styrene / Divinylbenzene (for butyl rubber substitution) | In certain sealing and damping applications (automotive, pharmaceutical stoppers), styrene-butadiene rubber (SBR) or EPDM can partially substitute butyl rubber (isobutene-isoprene copolymer) where the extreme gas impermeability of butyl rubber is not the primary requirement. This substitution requires significant product redesign and is only partial. |
Regulatory Status
| Region | Regulation / Policy Name | Issuing Authority | Year (enacted or latest revision) | Key Requirement / Threshold | Source |
|---|---|---|---|---|---|
| United States | NSPS Subpart Kc - Standards of Performance for Volatile Organic Liquid Storage Vessels Including Petroleum | US EPA | 2024 (finalized; applicable to construction/modification/reconstruction after 2023) | Storage vessels >=20,000 gallons (75.7 m³) with maximum true vapor pressure (MTVP) >=3.4 kPa (0.5 psia) for vessels >40,000 gallons or >=10.3 kPa (1.5 psia) for 20,000-40,000 gallons require 98% VOC control via floating roof with dual seals or closed vent system; general applicability reporting threshold 1.7 kPa; LEL monitoring and roof inspections required for affected facilities | US EPA (https://www.epa.gov/stationary-sources-air-pollution/volatile-organic-liquid-storage-vessels-including-petroleum; 40 CFR 60 Subpart Kc) |
| United States | Occupational Safety and Health Standards - Flammable Liquids (29 CFR 1910.106) | OSHA | 1971 (with revisions; isobutene treated as flammable liquid with flashpoint <=93°C) | Category 1 flammable liquid (flashpoint <23°C); storage/handling of Category 1-2 or Category 3 with flashpoint <100°F requires storage in closed containers or above-ground tanks outside buildings; separation distances 25 feet from tanks for loading/unloading; general standards apply to flammable liquid handling and storage | OSHA (http://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.106) |
| United States | UN Number / Hazard Classification - Isobutylene (UN 1055, Flammable Gas) | DOT / UN | Current (UN model regulations; US DOT alignment) | UN number 1055; hazard class 2.1 (flammable gas); packing group not assigned; requires proper shipping name ISOBUTYLENE; applies to transport by road, rail, sea (IMDG), air (IATA) | CAMEO Chemicals / DOT (https://cameochemicals.noaa.gov/chemical/3667; SDS references) |
| European Union | REACH Regulation - Registration, Evaluation, Authorisation and Restriction of Chemicals | ECHA | 2007 (ongoing registration; tonnage-based requirements) | Registration required for manufacture/import >=1 tonne/year; for >=10 tonnes/year a Chemical Safety Assessment (CSA) and Chemical Safety Report (CSR) must be submitted; low acute toxicity and low carcinogenic potential confirmed for isobutylene (CAS 115-11-7) with no specific restrictions or classification triggers | ECHA REACH (general guidance and substance evaluation; OECD SIDS summary for CAS 115-11-7) |
| China | Emission Standard of Pollutants for Petroleum Refining Industry | Ministry of Ecology and Environment (MEE) | 2015 (enacted; latest referenced version) | Ceiling values for air and water pollutants in petroleum refining operations; special limits for new facilities (e.g., >=97% removal efficiency for certain end-of-pipe controls); fugitive emission controls required for VOCs and other pollutants | Ministry of Ecology and Environment (https://english.mee.gov.cn/Resources/standards/Air_Environment/Emission_standard1/201605/t20160511_337511.shtml; GB 31570-2015) |
Key Influence Events
Isobutene (also called isobutylene, 2-methylpropene, CAS 115-11-7) is a branched-chain alkene with the molecular formula C4H8. It is a colorless, flammable gas at ambient conditions (boiling point −6.9 °C) with a faint petroleum-like odor. Isobutene is one of the four butene isomers and is a key petrochemical building block. Its highly reactive double bond makes it valuable for producing methyl tert-butyl ether (MTBE), tert-butyl alcohol (TBA), polyisobutylene (PIB), isooctane (alkylate), butyl rubber, methacrolein/methacrylic acid, and antioxidants such as BHT. It is produced primarily as a co-product of steam cracking of naphtha or LPG, from catalytic cracking (FCC) C4 streams, or by dehydrogenation of isobutane.
Top Countries Production Capacity
Production Process of Isobutene
Isobutene (also called isobutylene, 2-methylpropene, CAS 115-11-7) is a branched-chain alkene with the molecular formula C4H8. It is a colorless, flammable gas at ambient conditions (boiling point −6.9 °C) with a faint petroleum-like odor. Isobutene is one of the four butene isomers and is a key petrochemical building block. Its highly reactive double bond makes it valuable for producing methyl tert-butyl ether (MTBE), tert-butyl alcohol (TBA), polyisobutylene (PIB), isooctane (alkylate), butyl rubber, methacrolein/methacrylic acid, and antioxidants such as BHT. It is produced primarily as a co-product of steam cracking of naphtha or LPG, from catalytic cracking (FCC) C4 streams, or by dehydrogenation of isobutane.
Specs & Grades
| Property | Typical Value / Range | Unit | Grade / Note |
|---|---|---|---|
| Purity (Isobutene content) | ≥ 99.0 | wt% | Polymer / Chemical grade |
| Purity (Isobutene content) | ≥ 95.0 | wt% | Fuel / Alkylation grade |
| n-Butenes (1-butene + 2-butene) | ≤ 0.5 | wt% | Polymer grade |
| Butadiene | ≤ 10 | ppm wt | Polymer grade |
| Butadiene | ≤ 100 | ppm wt | Chemical grade |
| Total C3 hydrocarbons | ≤ 200 | ppm wt | Polymer grade |
| Total C5+ hydrocarbons | ≤ 100 | ppm wt | Polymer grade |
| Sulfur (total) | ≤ 1 | ppm wt | Polymer / Chemical grade |
| Water content | ≤ 10 | ppm wt | Polymer grade |
| Carbonyl compounds (as acetone) | ≤ 5 | ppm wt | Polymer grade |
| Methanol | ≤ 5 | ppm wt | Polymer grade |
| Dimethyl ether (DME) | ≤ 10 | ppm wt | Chemical grade |
| Molecular weight | 56.11 | g/mol | All grades |
| Boiling point (1 atm) | −6.9 | °C | All grades |
| Vapor pressure (20 °C) | ~3.0 | bar abs | All grades |
| Density (liquid, 20 °C) | ~594 | kg/m³ | All grades |
Who are the Top Players?
| Company | Headquarters | Key Facilities |
|---|---|---|
| LyondellBasell Industries | Rotterdam, Netherlands | Channelview TX, Baytown TX, Lake Charles LA, Terneuzen, Marl |
| Evonik Industries | Essen, Germany | Marl, Antwerp |
| ExxonMobil Corporation | Irving, Texas, USA | Baytown TX, Singapore |
| TPC Group | Houston, Texas, USA | Houston TX |
| BASF SE | Ludwigshafen, Germany | Ludwigshafen |
| INEOS | Zug, Switzerland | Antwerp |
| Sinopec | Beijing, China |
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