Polyamine Biomass Pretreatment for One-Pot Delignification
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Solution Overview
Problem
The complex structure and chemical diversity of lignocellulosic biomass hinder effective processing and fractionation into its constituents, particularly the recalcitrant nature of lignin, which limits the efficient conversion of biomass into valuable products.
Innovation Solution
The use of polyamines as solvents, either alone or in mixtures, to dissolve lignin from biomass by acting as Brønsted or Lewis bases and hydrogen bond donors/acceptors, optionally combined with enzymes and microbes, to produce sugars, with the potential for one-pot methods that eliminate solid-liquid separation and catalyst recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional pretreatment methods (sulfite, kraft, soda) are used to extract lignin, then delignification efficiency is improved, but environmental impact increases and product purity decreases
Solution Approach 1:
The patent changes the chemical parameters of the pretreatment process by using organosolv methods with organic solvents (ethanol, methanol, propanol) instead of conventional sulfur-based chemicals. This parameter change maintains delignification efficiency while eliminating harmful sulfur compounds, thereby reducing environmental impact and improving product purity without requiring additional purification steps
Solution Approach 2:
The patent employs readily available organic solvents (ethanol, methanol, propanol) that can be easily disposed of or recycled through simple distillation, replacing expensive and environmentally problematic sulfur-based chemicals. These solvents achieve effective delignification without creating persistent environmental contamination
2Object-affected harmful factors
If organosolv process is used with organic solvents, then product purity and environmental impact are improved, but the complexity of solvent selection and optimization increases
Solution Approach 1:
The patent identifies a universal solvent system (short-chain alcohols: ethanol, methanol, propanol) that can effectively delignify multiple types of lignocellulosic biomass. This universal approach simplifies solvent selection by providing a reliable family of solvents that work across different biomass feedstocks, eliminating the need for complex, feedstock-specific solvent optimization
Solution Approach 2:
The patent optimizes specific local parameters of the organic solvents (chain length, polarity, boiling point) to achieve optimal delignification performance. By focusing on a limited range of structurally related solvents with gradually varying properties, the complexity of solvent selection is reduced while maintaining effectiveness across different application conditions
3Manufacturing precision
If multiple separation and purification steps are implemented, then product purity is improved, but processing time and operational complexity increase
Solution Approach 1:
The organosolv process directly extracts and removes lignin from biomass in a single dominant step, separating it into a soluble form that can be easily recovered. This extraction approach achieves high product purity without requiring multiple sequential purification steps, significantly reducing processing time while maintaining effectiveness
Solution Approach 2:
The patent utilizes phase transition (solubilization of lignin in organic solvent followed by precipitation or distillation) to achieve separation in one or two steps. The lignin dissolves in the organic phase during pretreatment and can be recovered by simple phase separation or solvent removal, eliminating the need for complex multi-stage purification processes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach selectively extracts high lignin content while retaining hemicellulose and cellulose, achieving a significant increase in sugar yield and enabling cost-effective production of fermentable sugars and lignin from waste biomass.
Implementation Method 1
the polyamine is a Brønsted or Lewis base
Implementation Method 2
the polyamine...acts as Brønsted or Lewis bases and hydrogen bond donors/acceptors
Implementation Method 3
the polyamine is a Brønsted or Lewis base, and/or the polyamine is a hydrogen bond donor and/or acceptor
Implementation Method 4
introducing an enzyme and/or a microbe to the solubilized biomass mixture such that the enzyme and/or microbe produces a sugar
Implementation Method 5
introducing an enzyme and/or a microbe to the solubilized biomass mixture such that the enzyme and/or microbe produces a sugar
Data Source
AI summary
The present invention provides for a method to deconstruct a biomass: the method comprising: (a) introducing a solvent comprising a polyamine, or a mixture of polyamines, to a biomass to dissolve at least part of solid biomass in the solvent, wherein the polyamine is a Brønsted or Lewis base, and/or the polyamine is a hydrogen bond donor and/or acceptor; (b) optionally introducing an enzyme and/or a microbe to the solubilized biomass mixture such that the enzyme and/or microbe produces a sugar from the solubilized biomass mixture; (c) optionally separating the sugar from the solubilized biomass mixture; and (d) optionally separating the lignan from the solubilized biomass mixture.