13 March 2026

 

The bioeconomy promises to transform how the world produces fuels, chemicals and materials. Instead of relying on fossil resources, manufacturers are increasingly turning to biomass and fermentation processes to produce everything from biodegradable plastics to specialty chemicals.

Advances in biotechnology have made it easier than ever to engineer microbes that produce valuable molecules. Using fermentation, microorganisms can convert sugars into organic acids, polymers, fuels and other chemical building blocks.

Yet despite this technological progress, many bio-based products still struggle to scale commercially.

The challenge is not always producing the molecule. In many cases, the real obstacle appears later in the process: separating and purifying it.

In industrial biomanufacturing, extracting the desired product from a complex biological mixture can be one of the most technically challenging and economically decisive steps in the entire production chain.

From fermentation to purification

In a typical bio-based manufacturing process, microorganisms such as bacteria or yeast convert sugars into valuable molecules through fermentation. These molecules may include organic acids used in biodegradable plastics, food ingredients, fuels or specialty chemicals.

However, once fermentation is complete, the desired product is typically present in relatively low concentrations within a complex broth containing biomass residues, salts, proteins, pigments and other compounds.

Recovering a pure product from this mixture requires sophisticated separation technologies.

Industrial purification processes often involve several stages, including membrane filtration, chromatography, electrodialysis and ion-exchange systems. Each technique targets different impurities or molecular properties in order to progressively refine the product stream.

The challenge is not only technical but economic. If purification requires excessive energy, chemicals or processing steps, the resulting product may struggle to compete with petrochemical alternatives.

The challenge of downstream processing

In industrial biotechnology, purification and separation are collectively known as downstream processing.

While upstream technologies such as fermentation and metabolic engineering have advanced rapidly in recent years, downstream processing remains a major engineering challenge—particularly for new bio-based production pathways.

Fermentation broths contain complex mixtures of compounds that must be removed or separated before the target molecule reaches the purity levels required for industrial applications.

For many emerging bio-based chemicals, improving downstream efficiency is therefore critical to achieving commercial viability.

Why biomass makes purification harder

The challenge becomes even more complex when biomass is used as the starting material.

Agricultural residues, wood and other lignocellulosic feedstocks contain large amounts of renewable carbon that can be converted into sugars and other chemical intermediates. But these materials also generate complex mixtures of compounds during processing.

The hydrolysis of plant biomass typically produces mixtures of sugars derived from cellulose and hemicellulose, along with lignin fragments, salts and other by-products. Separating these components efficiently is essential for the viability of modern biorefineries.

Without effective purification strategies, valuable molecules may be lost during processing, reducing yields and increasing waste streams.

This is why process engineering—and particularly separation technologies—has become a critical discipline within the bioeconomy ecosystem.

Engineering solutions for complex mixtures

Companies working on industrial purification technologies focus on designing integrated systems that combine several separation techniques.

Membrane filtration can remove suspended particles and larger molecules. Electrodialysis separates charged compounds using electric fields. Chromatography enables highly selective separation of molecules based on their interaction with specialized resins.

These technologies are often combined to progressively refine product streams while minimizing energy consumption and chemical inputs.

One advanced example is Improved Simulated Moving Bed (ISMB) chromatography, a technique designed for continuous separation of molecules from complex mixtures. By circulating adsorbent materials through multiple columns in a controlled sequence, the process can achieve high separation efficiency while maintaining continuous operation.

As biomanufacturing scales from pilot facilities to full industrial plants, such technologies are becoming increasingly important.

Technologies behind the bioeconomy

The growing importance of these enabling technologies is reflected in industry events such as BIOKET26, which will take place March 17–19 in Fribourg, Switzerland.

BIOKET brings together researchers, industrial companies and technology developers working on the processes required to convert biomass into valuable products—from fermentation and catalysis to downstream purification and product recovery.

Among the companies exhibiting this year is Eurodia, a French engineering firm specializing in custom-designed liquid purification processes.

Based near Aix-en-Provence, Eurodia develops industrial systems that combine membrane filtration, electrodialysis, chromatography and ion-exchange technologies. These solutions are used in sectors ranging from food processing to industries linked to the energy transition, including biomass processing, lithium recovery and CO₂ capture.

At BIOKET, the company will present purification technologies designed to improve the processing of biomass-derived sugars and fermentation products.

Marie Chauve, Process Innovation Manager at Eurodia, is scheduled to speak on March 19 during a session dedicated to smarter downstream processing. Her presentation will focus on purification strategies for lignocellulosic sugars and the recovery of lignin—an abundant but often under-utilized component of plant biomass.

One technology highlighted is ISMB chromatography, which can purify biomass hydrolysates by removing minerals and color compounds while maintaining high sugar recovery rates. Such processes are already being used at industrial scale for sugars destined for bioplastics production.

Supporting the rise of bio-based chemicals

Purification technologies also play a central role in the production of fermentation-derived organic acids such as lactic acid, succinic acid and citric acid.

These molecules are widely used as intermediates in food ingredients, biodegradable plastics and specialty chemicals. Producing them through fermentation offers a renewable alternative to petrochemical synthesis—but only if the resulting products can be purified efficiently.

For example, lactic acid is the key precursor for polylactic acid (PLA), a biodegradable polymer increasingly used in packaging and consumer products. The quality of PLA depends heavily on the purity of the lactic acid used in production.

Similarly, succinic acid serves as a building block for solvents, coatings and biodegradable polymers. Efficient downstream processing is essential to make these bio-based alternatives competitive in global markets.

From pilot testing to industrial scale

Another critical step in developing new biomanufacturing processes is pilot testing.

Before a purification system can be deployed in a full-scale industrial facility, engineers typically conduct pilot-scale experiments to evaluate how different separation technologies perform under realistic operating conditions.

These tests help determine product recovery rates, energy requirements and long-term process stability. They also allow engineers to optimize the sequence of purification steps before moving to commercial deployment.

For many bioeconomy projects, the pilot stage becomes a decisive moment in the transition from laboratory innovation to industrial production.

Unlocking the full value of biomass

Improved purification technologies could also help biorefineries extract value from multiple components of biomass.

Lignocellulosic feedstocks contain three main fractions—cellulose, hemicellulose and lignin—each of which can potentially be converted into useful products.

Advanced separation strategies may allow companies to recover sugars for fermentation, isolate lignin for materials or energy applications and separate additional molecules that would otherwise end up in waste streams.

Such integrated approaches could significantly improve both the economics and sustainability of biomass processing.

The overlooked foundation of the bioeconomy

Synthetic biology and fermentation technologies often dominate headlines about the future of sustainable manufacturing.

But behind these breakthroughs lies a less visible layer of industrial engineering.

Purification technologies rarely attract the same attention as advances in biotechnology, yet they form the critical infrastructure that allows new molecules to move from laboratory discovery to commercial production.

As the bioeconomy continues to scale, solving the downstream processing challenge may prove to be one of the most important steps in turning promising innovations into viable industrial solutions.

 

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