Wood-Based MEG Production with Chip Size Control and Catalytic Conversion
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Solution Overview
Problem
Conventional methods for producing mono-ethylene glycol rely on non-renewable resources, necessitating a shift towards bio-based materials.
Innovation Solution
A method and arrangement for producing mono-ethylene glycol from wood-based raw materials involving pretreatment, enzymatic hydrolysis, and catalytic conversion to form a liquid composition of glycols, with specific control over wood chip sizes and impregnation treatments to enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional methods are used for producing mono-ethylene glycol, then production efficiency is maintained, but non-renewable resources are consumed
Solution Approach 1:
The invention changes the fundamental parameter of feedstock source from non-renewable petroleum-based ethylene to renewable wood-based carbohydrates. The multi-step process including pretreatment, enzymatic hydrolysis, and catalytic conversion transforms cellulose and hemicellulose into mono-ethylene glycol, achieving both renewable resource utilization and maintained production efficiency through optimized process parameters at each stage
2Adaptability or versatility
If wood chips are used as feedstock, then renewable resource utilization is achieved, but heterogeneous chip sizes reduce processing efficiency
Solution Approach 1:
The invention segments the heterogeneous wood chip feedstock into different size fractions using screening equipment. By separating chips into uniform size ranges (e.g., 3-10mm, 10-20mm, 20-40mm), the process ensures consistent pretreatment and hydrolysis efficiency. This segmentation resolves the contradiction by maintaining the advantage of using renewable wood-based feedstock while eliminating the processing inefficiencies caused by size variation
Solution Approach 2:
The invention performs preliminary size classification and sorting of wood chips before they enter the main conversion process. This preliminary action of screening and separating chips by size ensures that subsequent pretreatment and enzymatic hydrolysis steps operate on uniformly sized material, maximizing processing efficiency while retaining the benefit of using renewable wood-based feedstock
3Productivity
If thorough pretreatment is applied to wood-based feedstock, then conversion efficiency is improved, but process complexity increases
Solution Approach 1:
The invention segments the pretreatment process into distinct sequential stages: mechanical size reduction, screening/classification, chemical or steam pretreatment, and solid-liquid separation. Each stage is independently optimized and can be selectively applied based on feedstock characteristics. This segmentation allows thorough pretreatment for maximum conversion efficiency while managing process complexity through modular, staged operations rather than a single complex unit
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 the production of mono-ethylene glycol using renewable resources, ensuring homogeneous impregnation and efficient conversion processes, thereby reducing environmental impact and improving yield.
Implementation Method 1
subjecting the wood-based feedstock to at least one pretreatment to form a liquid fraction and a fraction comprising solid cellulose particles
Implementation Method 2
subjecting the fraction comprising solid cellulose particles to enzymatic hydrolysis to form a lignin fraction and a carbohydrate fraction
Implementation Method 3
subjecting the carbohydrate fraction to catalytical conversion to form a liquid composition of glycols
Implementation Method 4
a distillation unit configured to recover monoethylene glycol from the liquid composition of glycols
Data Source
AI summary
A method for producing mono-ethylene glycol (MEG) from a wood-based raw material, and wherein method comprises: i) providing a wood-based feedstock originating from the wood-based raw material and comprising wood chips, wherein at most 5 weight-% of the wood chips in the wood-based feedstock are overthick wood chips as specified by SCAN-CM 40:01, and subjecting the wood-based feedstock to at least one pretreatment to form a liquid fraction and a fraction comprising solid cellulose particles; ii) subjecting the fraction comprising solid cellulose particles to enzymatic hydrolysis to form a lignin fraction and a carbohydrate fraction; iii) subjecting the carbohydrate fraction to catalytical conversion to form a liquid composition of glycols; and iv) recovering mono-ethylene glycol from the liquid composition of glycols. Further is disclosed a corresponding arrangement and mono-ethylene glycol obtainable by the method.