Integrated Hemicellulose Extraction and Pulping Process
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Solution Overview
Problem
Current methods for extracting hemicellulose prior to pulping in pulp mills are not economically viable, limiting the commercial success of processes that aim to co-produce pulp and hemicellulosic sugars from biomass, and there is a need for improved processes to reduce costs and environmental impact.
Innovation Solution
A process involving the digestion of lignocellulosic biomass with steam and/or hot water to extract hemicellulose, followed by washing and refining to produce pulp with enhanced properties, while hydrolyzing the hemicellulose to generate hemicellulosic sugars, potentially using chemical pulping methods and integrating mass and energy recycling to optimize sugar yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If hemicellulose extraction is performed prior to pulping using conventional methods, then sugar recovery is achieved, but process complexity and costs increase significantly
Solution Approach 1:
The patent combines hemicellulose extraction and pulping operations into a single integrated process where both functions are achieved simultaneously through one treatment train, eliminating the need for separate extraction and pulping facilities and reducing overall process complexity
Solution Approach 2:
The pulping process is designed to serve multiple functions: it simultaneously delignifies the biomass and extracts hemicellulose sugars, making the pulping unit perform both traditional pulping and sugar recovery functions without requiring additional dedicated equipment
2Strength
If chemical pulping methods are used to produce high-quality pulp, then pulp strength and quality are improved, but chemical usage and environmental impact increase
Solution Approach 1:
The patent modifies pulping parameters including using milder chemical conditions, adjusting temperature and time profiles, and optimizing pH levels to achieve adequate pulp quality with reduced chemical consumption and lower environmental impact
Solution Approach 2:
The process extracts and removes hemicellulose sugars from the biomass during pulping, separating them from the lignin and cellulose matrix, which reduces the burden on chemical recovery systems and decreases harmful chemical byproducts
3Quantity of substance
If hemicellulose extraction is implemented in existing pulp mills, then additional revenue from sugars is generated, but capital costs and operational complexity increase
Solution Approach 1:
The patent integrates sugar production facilities with existing pulp mill infrastructure, combining extraction, hydrolysis, and fermentation units with available process streams to create a unified biorefinery operation that shares common utilities and processing equipment
Solution Approach 2:
Existing pulp mill equipment is utilized for multiple purposes: digesters serve both traditional pulping and hemicellulose extraction, and process streams are directed to multiple product lines, maximizing the utility of existing capital investments
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 process achieves high pulp yield and quality, enables the recovery of valuable hemicellulosic sugars, reduces chemical usage and environmental impact, and enhances the economic viability of pulp mills by integrating sugar production with pulp processing.
Implementation Method 1
digesting the biomass in the presence solely of steam and/or hot water to extract at least a portion of the hemicellulose into a liquid phase
Implementation Method 2
washing the extracted solids with water at a washing pH of about 7 or less, thereby generating a liquid wash filtrate and washed solids
Implementation Method 3
hydrolyzing the hemicellulose contained in the liquid phase and/or in the liquid wash filtrate, in the presence of a hydrolysis catalyst, to generate hemicellulosic sugars
Data Source
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AI summary
The GreenBox+ technology is suitable to extract hemicellulose sugars prior to pulping of biomass into pulp products. The revenue obtainable from the sugar stream can significantly improve the economics of a pulp and paper mill. An initial extraction and recovery of sugars is followed by production of a pulp product with similar or better properties. Other co-products such as acetates and furfural are also possible. Some variations provide a process for co-producing pulp and hemicellulosic sugars from biomass, comprising: digesting the biomass in the presence of steam and/or hot water to extract hemicellulose into a liquid phase; washing the extracted solids, thereby generating a liquid wash filtrate and washed solids; separating the liquid wash filtrate from the washed solids; refining the washed solids at a refining pH of about 4 or higher, thereby generating pulp; and hydrolyzing the hemicellulose to generate hemicellulosic fermentable sugars.