Two-Step Hydrolysis for Lignocellulosic Sugar Yield
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Solution Overview
Problem
Current methods for processing lignocellulosic biomass to fermentable sugars are inefficient due to high energy consumption and enzyme usage, and often result in low yields of C5 and C6 sugars, which are essential for economic viability in bioethanol production.
Innovation Solution
A two-step method involving pretreatment, solid/liquid separation, enzymatic hydrolysis of solid fractions, and optional mixed sugar hydrolysis of liquid fractions, allowing for separate processing of fractions with different inhibitor concentrations to enhance sugar yield and reduce energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional single-stage enzymatic hydrolysis is used, then the process is simple to operate, but the yield of C5 and C6 sugars is low and energy consumption is high
Solution Approach 1:
The patent divides the hydrolysis process into two separate stages: first hydrolyzing solid fractions to obtain C6 sugars, then hydrolyzing liquid fractions to obtain C5 sugars. This segmentation allows each stage to be optimized independently, improving overall sugar yield while reducing energy consumption by avoiding repeated heating and processing of entire biomass.
Solution Approach 2:
The patent extracts and separates the liquid fraction containing C5 sugars from the solid fraction containing C6 sugars through filtration. This extraction enables targeted processing of each fraction with appropriate enzymes and conditions, maximizing sugar recovery from both phases while minimizing energy waste.
2Productivity
If high enzyme dosage is used to increase hydrolysis efficiency, then sugar yield improves, but processing cost increases
Solution Approach 1:
The patent applies different enzyme compositions and dosages to different fractions based on their specific characteristics. Solid fractions receive cellulase-rich enzyme mixes optimized for C6 sugar release, while liquid fractions receive hemicellulase-rich enzyme mixes optimized for C5 sugar release. This localized optimization improves hydrolysis efficiency without requiring excessive enzyme quantities throughout the entire process.
Solution Approach 2:
The patent uses moderate enzyme dosages in the first solid fraction hydrolysis stage to release C6 sugars, then applies additional targeted enzymes in the second liquid fraction stage to release C5 sugars. This partial action approach ensures sufficient hydrolysis of each fraction without applying excessive enzyme quantities to the entire biomass at once, reducing overall enzyme consumption while maintaining high productivity.
3Quantity of substance
If complete hydrolysis of all biomass components is attempted, then total sugar yield increases, but processing time and energy consumption increase
Solution Approach 1:
The patent performs preliminary hydrolysis of the solid fraction to release C6 sugars before proceeding to hydrolyze the liquid fraction for C5 sugars. This sequential preliminary action allows each hydrolysis reaction to proceed to completion under optimized conditions without requiring simultaneous processing of all biomass components, thereby achieving complete sugar recovery without excessive time consumption.
Solution Approach 2:
The patent maintains continuous productive action by immediately filtering the solid fraction hydrolysate and proceeding to hydrolyze the liquid fraction without idle time. This continuous workflow ensures that both C6 and C5 sugars are recovered in sequence, achieving complete sugar yield while minimizing total processing time through efficient workflow integration.
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 method achieves efficient hydrolysis of lignocellulosic biomass with low energy input, producing high yields of C5 and C6 sugars and generating valuable lignin as a by-product, thereby improving the economic viability of bioethanol production.
Implementation Method 1
Enzymatic fiber hydrolysis of said first solid fraction from step (b) by use of an enzyme composition capable of degrading lignocellulosic material
Implementation Method 2
by use of an enzyme composition capable of degrading lignocellulosic material
Implementation Method 3
Because of limitations of its physical structure, lignocellulosic biomass cannot be effectively converted to fermentable sugars by enzymatic hydrolysis without some pretreatment process
Implementation Method 4
solid/liquid separation of the pretreated lignocellulosic material from step (a) into a first solid fraction and a first liquid fraction
Data Source
AI summary
A method for providing a C5/C6 product from a lignocellulosic material is disclosed, said method comprising the steps: (i) pretreatment of the lignocellulosic material; (ii) solid/liquid separation of the pretreated lignocellulosic material from step (a) into a first solid fraction and a first liquid fraction; (iii) enzymatic fiber hydrolysis of said first solid fraction from step (b) by use of an enzyme composition capable of degrading lignocellulosic material, thereby providing a C5/C6 fiber slurry comprising C5 and/or C6 sugars; (iv) solid/liquid separation of the C5/C6 fiber slurry from step (c) into a second solid fraction and a second liquid fraction; and optionally (v) combining said first liquid fraction and said second liquid fraction for enzymatic mixed sugar hydrolysis (MSH), whereby a MSH C5/C6 product is provided.