Polyamine Biomass Pretreatment for Selective Lignin Extraction
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Solution Overview
Problem
Existing biomass pretreatment methods, particularly organosolv processes, lack comprehensive guidelines for solvent selection and predictive models for effective lignin removal, leading to inefficiencies in biomass fractionation and biorefinery development.
Innovation Solution
The use of polyamines, which act as Brönsted or Lewis bases and hydrogen bond donors/acceptors, to dissolve lignin from biomass, optionally combined with enzymes and microbes, allowing for selective lignin extraction and sugar production without intermediate separation steps.
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 invention changes the chemical parameters of the pretreatment process by using organosolv methods with organic solvents (ethanol, methanol, propanol) instead of conventional sulfite, kraft, or soda methods. This parameter change achieves effective delignification while avoiding the harmful environmental impacts and purity issues associated with conventional methods, as the organic solvent system allows for sulfur-free processing and solvent recovery
Solution Approach 2:
The invention employs readily available organic solvents (ethanol, methanol, propanol) that can be easily obtained and processed. These solvents serve as temporary pretreatment agents that can be recovered and reused, replacing expensive and environmentally problematic conventional pretreatment chemicals while maintaining effective delignification
2Productivity
If organosolv process uses common organic solvents (alcohols, polyols), then delignification efficiency is improved, but solvent recyclability and process complexity are worsened
Solution Approach 1:
The invention selects specific organic solvents (ethanol, methanol, propanol) with favorable physical and chemical parameters for easy recovery through distillation. These solvents have appropriate boiling points and volatility characteristics that simplify the recovery system compared to other organosolv solvents, reducing process complexity while maintaining high delignification efficiency
Solution Approach 2:
The invention uses common organic solvents that serve multiple functions: they act as pretreatment agents for delignification, can be recovered through standard distillation processes, and the recovered solvents can be reused in subsequent pretreatment cycles. This multi-functionality reduces the need for specialized equipment and simplifies the overall process
3Manufacturing precision
If multiple intermediate separation steps are implemented for biomass fractionation, then purity of constituents is improved, but process complexity and time consumption increase
Solution Approach 1:
The invention combines the delignification step with the solvent extraction step into a single integrated organosolv process. The organic solvent simultaneously removes lignin from the biomass and can be recovered in one distillation step, eliminating the need for multiple sequential separation operations while maintaining effective fractionation of cellulose and lignin
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
Achieves high lignin solubility with low cellulose/hemicellulose solubility, enabling efficient sugar release and reducing the need for intermediate processing steps, thereby enhancing the production of fermentable sugars and lignin from biomass.
Implementation Method 1
the polyamine is a Brönsted or Lewis base, and/or the polyamine is a hydrogen bond donor and/or acceptor
Implementation Method 2
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
Implementation Method 3
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
Implementation Method 4
the enzyme and/or microbe produces a sugar from the solubilized biomass mixture
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 Brönsted 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.