Hydrothermal Biomass Conversion and Gasification Techniques
Summary
Hydrothermal conversion and gasification represent complementary pathways for transforming wet and dry biomass into energy, fuels and value-added chemicals. Hydrothermal methods operate in aqueous environments at elevated temperatures (180–400 °C) and pressures (10–25 MPa), enabling direct processing of high-moisture feedstocks without energy-intensive drying. Hydrothermal carbonisation (HTC) yields a coal-like solid called hydrochar, useful for soil amendment or co-firing in thermal plants, while hydrothermal liquefaction (HTL) produces a viscous biocrude amenable to further upgrading. Solvothermal variants introduce organic co-solvents to enhance deoxygenation and improve liquid yields. Gasification, by contrast, is an endothermic, high-temperature (700–1 200 °C) partial oxidation of carbonaceous solids or liquids to generate synthesis gas (syngas), a mixture of hydrogen, carbon monoxide and trace gases. Modern gasifiers, including fluidised beds and hybrid porous media systems, can convert hydrochar or biocrude into syngas for power generation, hydrogen production or downstream chemical synthesis. Integration of hydrothermal conversion with gasification offers a route to valorise diverse waste streams—from agricultural residues to municipal solid waste—enhancing resource efficiency and reducing greenhouse-gas emissions. Advances in catalyst design, reactor engineering and lifecycle assessment are now driving these technologies towards commercial deployment, underscoring their global significance for sustainable energy transitions and circular bioeconomy strategies.
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Hydrothermal Biomass Conversion and Gasification Techniques publication trend
The graph below shows the total number of articles in hydrothermal biomass conversion and gasification techniques across all publications each year (not limited to Nature Index journals).
Technical terms
Hydrothermal carbonisation (HTC): A wet thermochemical process converting biomass into a solid carbon-rich hydrochar under moderate temperature and pressure.
Hydrothermal liquefaction (HTL): A thermochemical route in aqueous phase that transforms biomass into a liquid biocrude via depolymerisation and deoxygenation reactions.
Hydrochar: A porous, carbonaceous solid product of hydrothermal carbonisation, resembling lignite in properties and suitable for combustion or soil amendment.
Syngas: A combustible gaseous mixture of hydrogen and carbon monoxide generated by gasification of carbonaceous feedstocks, used for heat, power or chemical synthesis.
Supercritical water: Water at temperatures and pressures above its critical point (374 °C, 22.1 MPa), exhibiting unique solvent properties that enhance biomass depolymerisation.
References
- Hybrid porous media gasification of urban solid waste pre-treated by hydrothermal carbonization. PLOS ONE (2023).
- Life Cycle Assessment of Hydrothermal Carbonization: A Review of Product Valorization Pathways. Agronomy (2024).
- Solvothermal Liquefaction of Blackcurrant Pomace in the Water-Monohydroxy Alcohol Solvent System. Energies (2023).
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