Downstream Processing of Bio-based Chemicals
Summary
Downstream processing encompasses the suite of separation, purification and formulation steps required to convert fermentation broths or other bioreactor outputs into high-purity bio-based chemicals. It accounts for a substantial fraction of the total production cost in industrial biotechnology, driven by the low concentrations of target products, the presence of water and diverse co-products, and the thermal sensitivity of biomolecules. Core operations include cell removal, concentration, selective adsorption or extraction, crystallisation and final polishing via distillation or chromatography. Energy efficiency and solvent selection are critical to minimising environmental impact and ensuring economic viability. Advances in integrated unit operations, membrane technologies and process intensification have enhanced both yield and throughput. As global demand for sustainable monomers, solvents and platform molecules grows, optimised downstream schemes will play a decisive role in enabling competitive, low-carbon manufacturing of fuels, polymers and fine chemicals from renewable feedstocks.
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Downstream Processing of Bio-based Chemicals publication trend
The graph below shows the total number of articles in downstream processing of bio-based chemicals across all publications each year (not limited to Nature Index journals).
Technical terms
Downstream processing: The sequence of unit operations for recovering and purifying target compounds from fermentation broths or other bioreactor outputs.
Extractive adsorption: A hybrid separation technique in which a solid sorbent embeds a liquid extractant, combining adsorption and liquid–liquid extraction mechanisms.
Vacuum distillation: A distillation process under reduced pressure that lowers boiling points to protect heat-sensitive bio-based molecules and reduce energy consumption.
Dividing-wall column: An advanced distillation column design that enables multiple component separations within a single shell, improving energy efficiency and compactness.
Zeolitic imidazolate frameworks (ZIFs): A subclass of metal–organic frameworks characterised by high surface area, tunable pore structure and chemical stability, used as selective adsorbents.
References
- Extractive adsorption of 1,3-propanediol on a novel polystyrene macroporous resin enclosing medium and long-chain alcohols as extractant. Bioresources and Bioprocessing (2023).
- Recovery of 2,3-Butanediol from Fermentation Broth by Zeolitic Imidazolate Frameworks. Industrial & Engineering Chemistry Research (2023).
- Eco-efficient downstream processing of 1,3-propanediol applicable to various fermentation processes. Process Biochemistry (2024).
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