Technology · Biochemistry & industrial biotech / Platform chemicals

Biosynthetic butadiene

Renewable routes to 1,3-butadiene, the C4 monomer behind synthetic rubber and ABS plastics, via two competing chemistries: catalytic bioethanol-to-butadiene conversion (Axens/Michelin/IFPEN's BioButterfly, ETB Global in the Netherlands) and methane gas fermentation (BioVerde Tech and Unibio in a 2026 partnership) — both still at demonstration or early-pilot scale, with no confirmed Chinese or Indian commercial originator as of 2026.

Maturity 4/9 Risk: high Industrial chemistry US · EU Science: why it works → verified 2026-07-21 · 4 Sources (0 independent)

1 · What it gives

Roughly 15 million tons of 1,3-butadiene are produced globally each year, almost entirely from fossil naphtha cracking, to supply synthetic rubber (for tires) and ABS plastics. Axens, Michelin and IFPEN’s BioButterfly technology converts bioethanol into butadiene through a two-reactor catalytic process — ethanol is first dehydrogenated to acetaldehyde, which then reacts with further ethanol to form butadiene — and has been running at an industrial demonstration plant at a Michelin site for three years, producing tires with the resulting bio-based butadiene; Michelin and Axens announced discussions in July 2026 to accelerate deployment of the technology. ETB Global, based in the Netherlands, holds a patented single-reactor process that converts bioethanol directly into butadiene, building on a prior collaboration with Trinseo to explore purified bio-based 1,3-butadiene for green-tyre rubber. A separate chemistry route emerged in April 2026, when BioVerde Tech (Houston, Texas) and Unibio (Roskilde, Denmark) announced a strategic partnership combining BioVerde’s engineered methanotroph strains with Unibio’s commercial-scale U-Loop gas fermentation reactors to convert methane directly into butadiene and related chemical intermediates, an initial target application for a platform Unibio otherwise operates for single-cell protein. No Chinese or Indian company cleared source confirmation as a dedicated bio-butadiene commercial originator as of 2026.

The key directions of biosynthetic butadiene are:

Catalytic bioethanol-to-butadiene conversion (Ethanol-to-Butadiene Catalysis): two-step dehydrogenation/condensation chemistry converting bioethanol into butadiene at demonstration scale — Axens/Michelin/IFPEN’s BioButterfly.
Methane gas fermentation to butadiene (Methane Gas Fermentation to Butadiene): engineered methanotroph strains grown in commercial-scale gas fermentation reactors convert methane directly into butadiene and other chemical intermediates — the BioVerde Tech/Unibio partnership.
One-step bioethanol-to-butadiene synthesis (One-Step Butadiene Synthesis): a single-reactor catalytic route converting bioethanol directly into butadiene, a simpler alternative to the two-reactor BioButterfly process — ETB Global.
Demonstration-to-commercial scale-up (Bio-Butadiene Scale-Up): moving bio-butadiene routes from tonnes-per-year demonstration plants toward the volumes required to supply tire and plastics manufacturers — the common bottleneck across all three companies.

Sectoral value chain#

[bioethanol/methane feedstock] ──> [catalytic conversion or gas fermentation] ──> [butadiene purification]
                                                    │
                                       (co-products: bio-hydrogen, ethylene)
                                                    │
                                                    ▼
[commercial-scale plant] <─── [tire/rubber/ABS manufacturing] <─────┘

Value chain levels#

Level	Description	Key inputs/outputs
Feedstock Sourcing	sourcing bioethanol (from sugar/starch fermentation) or methane (natural gas, biogas) as the carbon feedstock	In: bioethanol or methane supply. Out: feedstock-ready input stream.
Catalytic Conversion / Gas Fermentation	bioethanol is catalytically dehydrogenated and condensed, or methane is fermented by engineered methanotrophs, into crude butadiene	In: bioethanol/methane, catalyst or microbial strain. Out: crude butadiene stream.
Purification	crude butadiene is purified to the specification required for synthetic-rubber and ABS polymerization	In: crude butadiene. Out: polymer-grade 1,3-butadiene.
Co-Product Recovery	recovery of co-products generated alongside butadiene, such as bio-hydrogen and ethylene	In: conversion off-gas/byproduct stream. Out: marketable co-products.
Demonstration/Pilot Operation	operating a demonstration or pilot plant to validate process economics and product quality at meaningful scale	In: polymer-grade butadiene, plant operating data. Out: validated process ready for scale-up.
Commercial Scale-Up	expanding from demonstration scale to volumes sufficient for tire, rubber and plastics manufacturers	In: validated process, customer offtake interest. Out: commercial-scale bio-butadiene supply.

Cross-cutting technologies of the sector:

Two-step dehydrogenation/condensation catalysis (Ethanol-to-Butadiene Catalysis): the BioButterfly chemistry converting bioethanol to acetaldehyde in a first reactor, then condensing it with further ethanol into butadiene in a second reactor.
Engineered methanotroph gas fermentation (Methane Gas Fermentation to Butadiene): microbial strains engineered to convert methane into multi-carbon chemical intermediates, run in commercial-scale gas fermentation reactors (Unibio’s U-Loop design).
Single-reactor catalytic conversion (One-Step Butadiene Synthesis): ETB Global’s patented process condensing the two-step BioButterfly chemistry into a single catalytic reactor.

2 · What it replaces 6 · matched by industry

D2E2	Biodegradable, bio-based lubricants and hydraulic fluids (vegetable-oil and synthetic esters) — instead of mineral-oil lubricants in forestry, agriculture, marine, rail and water-adjacent machinery Replaces: Mineral-oil hydraulic fluids, chainsaw bar oils, gear and stern-tube oils, greases (and total-loss lubricants lost directly to the …	CHEM
D1E–	Bio-based and safer solvents — Cyrene (dihydrolevoglucosenone from cellulose), 2-methyltetrahydrofuran (2-MeTHF from furfural/levulinic acid), ethyl lactate, bio-ethanol, γ-valerolactone, limonene — instead of NMP, DMF, DMAc, dichloromethane and other hazardous solvents Replaces: N-methyl-2-pyrrolidone (NMP), N,N-dimethylformamide (DMF), dimethylacetamide (DMAc), dichloromethane (DCM), chloroform, toluene/xylene in …	CHEM
D1E–	Biosurfactants (rhamnolipids, sophorolipids) instead of petrochemical surfactants in cleaning and industrial formulation Replaces: Petrochemical surfactants in cleaners and formulations - linear alkylbenzene sulfonate (LAS), alcohol ethoxylates (AEO), alkylphenol …	CHEM
D2E2	Detergent enzymes for low-temperature washing instead of phosphates, extra surfactant and hot washing Replaces: Phosphate builders (STPP), part of the fossil-based surfactant load, and high wash temperatures (60–90 °C) needed to remove protein, starch …	CHEM
D2E–	Industrial biocatalysis (enzymes and whole cells) — e.g. nitrile hydratase for acrylamide, engineered transaminase for sitagliptin, enzymatic antibiotic side-chain processes — instead of heavy-metal catalysts, high-pressure hydrogenation and multistep chemistry with toxic reagents Replaces: Copper-catalysed sulfuric-acid hydration of acrylonitrile; rhodium-catalysed high-pressure asymmetric hydrogenation; chemical deacylation of …	CHEM
D2E–	Oil-reservoir and pipeline souring (H2S) control by nitrate injection (biocompetitive exclusion by nitrate-reducing bacteria) — instead of continuous biocide dosing Replaces: Glutaraldehyde, THPS (tetrakis(hydroxymethyl)phosphonium sulfate), quaternary ammonium biocides, acrolein and other biocides injected into …	SERV

3 · How to implement 6 steps

1
Feedstock sourcingFeedstock & raw materials
Bioethanol (from sugar/starch fermentation) or methane (natural gas, biogas) is sourced as the carbon feedstock, as with Axens/ETB Global’s ethanol route and BioVerde/Unibio’s methane route.
Who can do this step matched automatically
Godavari Biorefineries (NSE) India
industrial scale
“Recent updates highlight public communications on ethanol myths and the broader role of bio-based feedstocks in India.”
Sea6 Energy India
industrial scale
“Sea6 Energy (founded 2010, headquartered in Bangalore, India) develops mechanized tropical seaweed farming and converts cultivated seaweed biomass into carbon-negative, sustainable …”
India Glycols (NSE) India
✓ ISO 9001 7,500 MT/ industrial scale
“India Glycols Limited holds the distinction of being the only green petrochemical company of its kind and is the first and only in the world to have commercialized the production …”
Taiwan Sugar Corporation (TSC) Taiwan
500,000 tons pilot scale
“2026-05-05 [Taisugar signs MOU with US nonprofit on biofuel - Taipei Times — Taiwan Sugar Corp (Taisugar) signs an MOU with US nonprofit USGBC to develop biofuels (ethanol-blended …”
2
Catalytic conversion / gas fermentationFermentation & cultivation
Bioethanol is catalytically dehydrogenated and condensed into butadiene (BioButterfly’s two-reactor process, ETB Global’s single-reactor process), or methane is fermented by engineered methanotrophs within a gas fermentation reactor (BioVerde/Unibio).
Who can do this step matched automatically
Advanced Enzyme Technologies (NSE) India
✓ ISO 9001 500 m3
“Technology: microbial fermentation with ~500 m3 fermentation capacity; 15+ patents; developed/upscaled probiotic production technologies.”
Fermelanta Japan
3,000 L pilot scale
“We transform the traditional supply chain depending on agricultural cultivation and extraction into a next-gen microbial fermentation process that can offer low-cost and …”
CHITOSE Japan
industrial scale
“AI x BIOMANUFACTURING”
Fermbox Bio India
400 kilolitres industrial scale
“Fermbox Bio is an active Bengaluru-based synthetic biology and precision fermentation company founded in 2022 by Subramani Ramachandrappa and Preeti Dharmagoudar.”
ScaleUp Bio Singapore
10,000 L pilot scale
“ScaleUp Bio is a Singapore-based CDMO specializing in precision fermentation for food, nutrition, and specialty bio-based ingredients.”
3
PurificationPurification & downstream
Crude butadiene is purified to the specification required for synthetic-rubber and ABS polymerization, the step validated at Axens/Michelin’s demonstration plant over three years of operation.
Who can do this step matched automatically
Advanced Enzyme Technologies (NSE) India
✓ ISO 9001 500 m3
“Development of robust, scalable fermentation and downstream processing (production and recovery/yield optimization).”
ScaleUp Bio Singapore
10,000 L pilot scale
“Core capabilities span pilot-industrial fermentation and downstream unit operations (centrifugation, TFF, chromatography, solvent extraction, spray/freeze drying) with cGMP …”
SyncoZymes (Shanghai) China
1,200 tons industrial scale
“CRO/CDMO and Testing/Quality Research Services: Comprehensive contract research and development, analytical, and quality assessment capabilities with access to NMR, LC-MS, GC-MS, …”
Alfa Laval Sweden
✓ ISO 9001
“Here we compare the three most common options: centrifugation, filtration and coalescence.”
Esco Aster Singapore
✓ ISO 9001 5,000 L industrial scale
“Adherent cell culture and downstream processing: commercialized Tide Motion bioreactor platform (MiniTide to TideXcell) with closed automated cell harvesting and single-use …”
4
Co-product recovery
Industry coverage of the ethanol route has noted potential co-products including bio-hydrogen and ethylene, which could add value across the wider chemicals chain alongside the primary butadiene stream.
5
Demonstration/pilot operation
Axens/Michelin/IFPEN’s BioButterfly has operated at industrial demonstration scale for three years, already producing finished tires; the BioVerde/Unibio methane route and ETB Global’s single-reactor process remain at an earlier pilot/partnership stage announced in 2026.
6
Commercial scale-upContract manufacturing (CMO/CDMO)
Producers must move from tonnes-per-year demonstration volumes to the scale required by tire and plastics manufacturers; Michelin and Axens’ July 2026 deployment discussions target exactly this step, while supply reliability, certification and cost remain open questions across all three companies.
Who can do this step matched automatically
ScaleUp Bio Singapore
10,000 L pilot scale
“ScaleUp Bio is a Singapore-based CDMO specializing in precision fermentation for food, nutrition, and specialty bio-based ingredients.”
SyncoZymes (Shanghai) China
1,200 tons industrial scale
“CRO/CDMO Services”
Lotte Chemical South Korea
industrial scale
“Songdo CDMO Competition Begins - The Asia Business Daily — Lotte Biologics (not Lotte Chemical) is advancing its Songdo Plant 1 to GMP-Ready by November to enter Korea’s …”
Taiwan Sugar Corporation (TSC) Taiwan
500,000 tons pilot scale
“It refines sugar (including refined white sugar, golden brown sugar, fine granulated sugar and invert sugar syrup), produces bio-based chemicals/biotech outputs (alcohol, …”

4 · Who delivers

Matched suppliers (matched automatically)

Unibio	Denmark	Producer	active
Toray	Japan	Producer	active
LG Chem	South Korea	Producer	active

In the services and supply catalogue 2 · paid service

Contract manufacturing (CMO/CDMO/toll) · Upstream — fermentation & cell culture

Leading companies and institutes (from the brief)

Company / Institute	Country	Key products / platforms	Tech features	Status 2026
Axens	🇫🇷 France	BioButterfly bioethanol-to-butadiene (with Michelin, IFPEN)	Two-reactor dehydrogenation/condensation, 3-year industrial demo plant	commercial
ETB Global	🇳🇱 Netherlands	Patented single-reactor bio-butadiene process	One-step bioethanol-to-butadiene conversion	pilot
Unibio	🇩🇰 Denmark	U-Loop gas fermentation (methane-to-butadiene, with BioVerde)	Commercial-scale gas fermentation reactor design	commercial
BioVerde Tech	🇺🇸 USA	Engineered methanotroph platform	Methane-to-multi-carbon-compound biological conversion, granted US patents	pilot

5 · Rules & route to market

Route into Russia / EAEU: CHEM · Minpromtorg (registration) / Rospotrebnadzor (notification of new substances)
state registration ~10-15 working days after expert assessment; new substances need notification
Information, not legal advice — confirm the procedure for your product. (2026-10-06)

United States

The US hosts the methane-fermentation route to bio-butadiene, in an early-stage partnership announced in 2026.

BioVerde Tech, EPA#

BioVerde Tech (Houston, Texas): develops engineered methanotroph strains that convert methane into chemical intermediates and protein-rich biomass, holding multiple granted and pending US patents on methane-to-multi-carbon-compound biological conversion; in April 2026 it announced a strategic partnership with Denmark’s Unibio targeting butadiene as an initial chemical application of the combined platform.
EPA framework: bio-based butadiene produced from methane or bioethanol feedstocks in the US falls under standard EPA industrial-chemical and, where renewable-fuel-linked feedstocks are involved, Renewable Fuel Standard frameworks, alongside conventional TSCA chemical review.

European Union

Europe hosts both the most advanced bio-butadiene demonstration plant and a competing single-reactor process, anchored in France and the Netherlands.

Axens, ETB Global, REACH#

Axens (Rueil-Malmaison, France): together with Michelin and IFP Energies Nouvelles (IFPEN), operates the BioButterfly bioethanol-to-butadiene technology at an industrial demonstration plant at a Michelin site, running for three years and already used to manufacture tires with bio-based butadiene; Michelin and Axens announced discussions in July 2026 to accelerate the technology’s deployment.
ETB Global (Netherlands): holds a patented single-reactor process converting bioethanol directly into butadiene, positioned as a drop-in alternative to fossil-derived material, building on a 2021 collaboration with Trinseo exploring purified bio-based 1,3-butadiene for green-tyre synthetic rubber.
REACH framework: bio-based butadiene manufactured or placed on the EU market falls under REACH chemical registration, evaluation and authorisation, the same regime governing its fossil-derived counterpart.

China

No Chinese company cleared source confirmation as a dedicated bio-butadiene commercial originator as of 2026; the two leading Chinese candidates queried (Cathay Biotech, a major synthetic-biology chemicals producer, and Sinopec, the state petrochemical major) returned no company-specific bio-butadiene product or project coverage — Cathay Biotech’s confirmed 2026 news centers on an unrelated biopharmaceutical subsidiary, and Sinopec’s confirmed activity centers on conventional petrochemical ethylene output.

research gap, NDRC/MIIT petrochemical policy#

Research gap: Chinese industrial-biotechnology reporting in this period emphasizes fermentation-derived platform chemicals broadly (lactic acid, 1,3-propanediol) rather than a dedicated bio-butadiene originator; conventional naphtha- and ethanol-dehydration-based butadiene production remains the confirmed domestic pathway.
Regulatory pathway: to the extent a bio-butadiene product reached the Chinese market, industrial chemical registration would run through standard MIIT/NDRC petrochemical-sector channels rather than a dedicated biotech pathway.

6 · Money: tenders & grants

Grant	Exploring the frontiers of environmental research 2026 UKRI · United Kingdom	Nov 12, 2026 27 days
Grant	Additional activities for the European Partnership of Agriculture of Data European Commission · EU	Nov 26, 2026 41 days
Grant	Advancing Global Health Bureau of Global Health Security and Diplomacy · United States	Feb 14, 2027 121 days
Grant	African Union – European Union Partnership on Food and Nutrition Security and Sustainable Agriculture (FNSSA) European Commission · EU	Sep 23, 2027 342 days
Grant	Crafting routes to a circular economy European Commission · EU	Sep 23, 2027 342 days

7 · Tech stack & innovations

The stack spans two distinct feedstock-to-butadiene chemistries: catalytic conversion of bioethanol, and biological gas fermentation of methane.

Two-step catalytic conversion (Ethanol-to-Butadiene Catalysis):
- Axens/Michelin/IFPEN’s BioButterfly dehydrogenates bioethanol to acetaldehyde in a first reactor, then condenses it with further ethanol into butadiene in a second reactor, validated over three years of demonstration-plant operation including production of finished tires.
Engineered methanotroph gas fermentation (Methane Gas Fermentation to Butadiene):
- BioVerde Tech’s engineered Methylococcus capsulatus strains, deployed within Unibio’s proprietary U-Loop vertical gas fermentation reactors, are designed to convert methane and other low-cost gaseous feedstocks into butadiene and related chemical intermediates.
Single-reactor catalytic synthesis (One-Step Butadiene Synthesis):
- ETB Global’s patented process condenses bioethanol-to-butadiene conversion into a single catalytic reactor, a simpler alternative to the two-reactor BioButterfly chemistry, building on a prior Trinseo collaboration targeting green-tyre synthetic rubber.
Demonstration-to-commercial scale-up (Bio-Butadiene Scale-Up):
- Across all three companies, the shared technical challenge is scaling from tonnes-per-year demonstration or pilot operation to the volumes required by tire and plastics manufacturers, a gap Michelin and Axens explicitly targeted in their July 2026 deployment discussions.

Sources 4 · 0 independent · 4 producer sites

Producers' own sites 4

Axens producer checked 2026-03-05 · link not kept
Etb global producer checked 2026-06-26 · link not kept
Unibio producer checked 2026-05-21 · link not kept
Bioverde tech producer checked 2026-04-20 · link not kept