Biomass Extrusion Pretreatment With Seconds-Scale Hydrolysis
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Solution Overview
Problem
Current biomass pretreatment methods are inefficient, leading to prolonged processing times that result in inhibitor formation, incomplete hydrolysis of cellulose, and increased costs due to energy requirements and reduced yields in enzymatic hydrolysis and fermentation processes.
Innovation Solution
A method involving an extrusion system that treats biomass at elevated temperatures and pressures for less than 20 seconds, using rotatable screws to move biomass through a reaction zone, with optional addition of liquids, steam, and chemical agents to produce a pretreated composition with high monosaccharide yields and low inhibitor levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If biomass is treated under pressure and heat for long periods (one hour or more), then complete hydrolysis of cellulose is achieved, but inhibitor formation increases and energy costs rise
Solution Approach 1:
The patent applies parameter changes by dramatically reducing the treatment time from one hour or more to less than 20 seconds, while adjusting temperature and pressure parameters to achieve effective pretreatment without excessive inhibitor formation. This rapid parameter change resolves the contradiction between achieving complete hydrolysis and minimizing inhibitor formation.
Solution Approach 2:
The invention uses the 'rushing through' principle by implementing an extremely short treatment residence time of less than 20 seconds. The rotatable screws rapidly move biomass through the reaction zone, skipping the prolonged exposure that causes inhibitor formation, while still achieving the necessary hydrolysis through optimized temperature and pressure conditions during this brief period.
2Manufacturing precision
If biomass is treated under pressure and heat for long periods, then complete hydrolysis of cellulose is achieved, but energy requirements increase
Solution Approach 1:
The system rushes the biomass through the reaction zone in less than 20 seconds, dramatically reducing the time for which energy must be applied. The rotatable screws enable this rapid transit, allowing complete hydrolysis to be achieved with minimal energy input compared to traditional one-hour or longer treatment periods.
Solution Approach 2:
The patent changes the temporal parameter from prolonged treatment to ultra-rapid treatment (less than 20 seconds), which fundamentally reduces the total energy requirements. The temperature and pressure parameters are optimized to ensure that the brief exposure time still achieves complete cellulose hydrolysis, resolving the contradiction between hydrolysis completeness and energy consumption.
3Object-generated harmful factors
If pretreatment period is decreased to reduce energy costs, then inhibitor formation is reduced, but incomplete separation of carbohydrates from lignins occurs
Solution Approach 1:
The patent resolves this contradiction by changing the parameter combination: using extremely high temperature and pressure during a very short time (less than 20 seconds). This parameter change enables complete separation of carbohydrates from lignins without the inhibitor formation that occurs in traditional prolonged treatments, as the rapid parameter change achieves the necessary hydrolysis before inhibitors can form.
4Loss of time
If pretreatment period is decreased to reduce energy costs, then processing time is reduced, but carbohydrate availability for enzymatic hydrolysis is reduced
Solution Approach 1:
The system rushes the pretreatment process through in less than 20 seconds using rotatable screws to rapidly transport biomass through the reaction zone. This rapid processing maintains carbohydrate availability for enzymatic hydrolysis by achieving complete cellulose breakdown during the brief exposure, resolving the contradiction between reduced processing time and maintained carbohydrate quantity.
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 enables rapid, efficient pretreatment of biomass, reducing inhibitor formation and energy costs, while maintaining high yields of monosaccharides and ensuring complete hydrolysis of cellulose, thus improving the overall biomass utilization process.
Implementation Method 1
treating the biomass at an elevated temperature and pressure within the reaction zone for less than about 20 seconds to produce a pretreated biomass composition comprising a liquid fraction comprising monosaccharides
Implementation Method 2
one or more rotatable screws configured to move the biomass through the extrusion system from the feeder zone and through the reaction zone
Implementation Method 3
the one or more rotatable screws comprise one or more sections that are configured to form one or more plugs from the biomass to separate the inner chamber into two or more zones
Data Source
AI summary
Disclosed herein are methods, systems, and compositions for the pretreatment of biomass within seconds with low inhibitor formation. The pretreatment process is used to convert biomass to a fuel or other useful chemicals by subjecting the feedstock to a rapid retention time under pressure and temperature and/or chemical reactant. The system includes a continuously-operating valve discharge apparatus to discharge pretreated feedstock while maintaining uniform pressure on the pretreatment system.