Development of a green solvent process for biomass-derived platform chemicals using supercritical fluid extraction and catalytic upgrading

Project Abstract

This study investigates a green solvent-based processing route to convert biomass-derived platform chemicals into value-added products using a combination of supercritical fluid extraction (SFE) and catalytic upgrading, aiming to minimize environmental impact while maximizing efficiency and product selectivity. The research integrates solvent selection guided by green chemistry metrics, such as toxicity, renewability, and life-cycle energy intensity, with process intensification strategies enabled by supercritical CO2 (scCO2) as a tunable solvent that enables selective extraction, fractionation, and in situ reaction with minimal solvent residues. A feedstock mix comprising lignocellulosic residues and compatible agricultural by-products is characterized to determine the chemical composition, moisture content, and ash burden, informing pretreatment conditions that enhance accessibility of phenolics, sugars, and lipophilic compounds to scCO2 and downstream catalysts. The extraction phase is optimized to recover high-purity platform chemicals (e.g., phenolic derivatives, conjugated dienes, and carbonyl-containing fragments) while suppressing charring and polymerization that commonly accompany lignin and hemicellulose fractions. In parallel, a catalytic upgrading strategy employing heterogeneous metal-oxide and bifunctional acid–base catalysts operates under supercritical conditions to promote selective deoxygenation, hydrogenation, and rearrangement pathways, producing platform intermediates suitable for polymer precursors, fuels, and specialty chemicals. The experimental workflow employs a design of experiments (DoE) approach to map process variables including temperature, pressure, SFE co-solvent composition, flow rates, catalyst loading, and residence time, with analytical tracking of product distributions via GC-MS, GC-FID, HPLC, and NMR. Life-cycle assessment (LCA) and techno-economic analysis (TEA) are conducted to evaluate environmental footprints and economic viability relative to conventional petrochemical routes and existing biomass processing technologies. A key objective is to demonstrate solvent recyclability and negligible solvent loss through closed-loop recovery, supported by real-time solvent composition monitoring and on-line separation modules. The study also investigates catalyst stability under supercritical conditions and potential deactivation mechanisms, proposing regeneration protocols and reactor design considerations to maintain long-term performance. Anticipated outcomes include a robust process window where scCO2 selectively extracts lignin-derived phenolics and carbohydrate-derived platform chemicals, followed by catalytic upgrading to high-value intermediates such as anisaldehyde analogs, phenolic ethers, and hydrocarbon-rich streams suitable for polymerization or fuel applications. The project contributes to the development of a scalable, modular biorefinery concept with integrated solvent management, reduced energy demand, and lower greenhouse gas emissions. Results are expected to demonstrate improved product yields, reduced processing steps, and enhanced product purity compared with traditional solvent-based methods, thereby offering a practical pathway toward sustainable biomass valorization. The findings will inform optimization of reactor design, catalyst formulation, and process integration strategies to facilitate technology transfer to pilot and industrial scales, while aligning with regulatory and safety frameworks for green solvent systems and supercritical fluid technologies.

Project Overview

What This Project Is About

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A plain-language overview of the topic and what the project investigates.

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The Problem It Addresses

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Many biomass-derived chemicals are produced using harsh or wasteful solvents. This project looks for a greener solvent approach that uses supercritical carbon dioxide to extract useful compounds and then upgrades them with simple catalytic steps, reducing energy use and waste.

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Objectives of the Project

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1. Identify a green solvent system that can extract target biomass chemicals efficiently.
2. Demonstrate a basic catalytic upgrading route to convert extracted products into useful platform chemicals.
3. Evaluate environmental and economic benefits compared to conventional methods.

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What You Will Do Step by Step

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1. Review background literature on green solvents and supercritical fluid extraction.
2. Design small-scale extraction experiments using carbon dioxide and benign co-solvents.
3. Perform catalytic upgrading tests on extracted compounds under mild conditions.
4. Analyze product composition with simple, safe analytical methods.
5. Compare energy use, waste generation, and costs with traditional methods.

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Expected Outcome

Deliver a clear, tested protocol for a green solvent-based extraction and upgrading sequence, plus a basic life-cycle and cost assessment showing reduced environmental impact and potential scalability.