Substituted Benzene Solvent for Levulinic Acid Separation
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Solution Overview
Problem
Current methods for isolating levulinic acid from biomass hydrolysate, such as using 2-sec-butylphenol, suffer from insufficient extraction efficiency and the formation of side products during distillation, necessitating an improved separation process that balances extraction efficiency with compatibility for subsequent distillation steps.
Innovation Solution
Employing a substituted benzene as an organic solvent with specific ortho-positioned alkyl groups, such as o-cresol or 2,6-dimethylphenol, for extraction at elevated temperatures, which enhances extraction efficiency while minimizing side product formation during distillation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If 2-sec-butylphenol is used as extraction solvent, then extraction can be performed, but the extraction coefficient is insufficient
Solution Approach 1:
The patent changes the chemical structure parameters of the extraction solvent by specifying substituted benzenes with ortho-positioned alkyl groups (C1-3) and OR1 groups. This structural parameter change transforms 2-sec-butylphenol into compounds like o-cresol, 2-methylphenol, and 2,6-dimethylphenol, which achieve extraction coefficients greater than 10, resolving the insufficient extraction coefficient problem while maintaining good extraction efficiency.
2Productivity
If a solvent is used that gives good extraction efficiency, then extraction performance is improved, but side products are formed during distillation
Solution Approach 1:
The patent applies local quality by specifying the precise positional arrangement of functional groups on the benzene ring - specifically ortho-positioning of alkyl groups relative to OR1 groups. This localized structural feature (ortho-positioning) creates the right balance between extraction efficiency and distillation compatibility, preventing side product formation during distillation while maintaining high extraction performance.
3Productivity
If extraction is performed at higher temperature, then extraction efficiency may improve, but side product formation increases
Solution Approach 1:
The patent uses the ortho-positioned alkyl groups in the solvent structure as a protective feature that cushions against thermal degradation. This structural cushioning prevents levulinic acid from decomposing into side products during the extraction and subsequent distillation processes, allowing the use of elevated temperatures (60-80°C) to improve extraction efficiency without increasing side product formation.
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
The process achieves high extraction efficiency of levulinic acid with reduced side product formation during distillation, allowing for effective separation and recovery of levulinic acid, and facilitates easy separation of the solvent, thereby improving the overall separation process.
Implementation Method 1
Extraction takes advantage of differences in the chemical properties of the feed components, such as differences in polarity and hydrophobic/hydrophilic character to separate them
Implementation Method 2
the valuable compound is usually further purified by subjecting the organic phase to distillation
Data Source
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AI summary
The invention provides a process to separate levulinic acid from a biomass hydrolysate said process comprising extraction using as an organic solvent a substituted benzene comprising (i) at least one OR1 group wherein R1 is H or CH3; and (ii) at least one C1-3 alkyl group, wherein each of the at least one OR1 group is ortho positioned to at least one C1-3 alkyl group. Using said substituted benzene as extraction solvent gives good extraction efficiency, the extraction can advantageously be carried out at elevated temperature, and is very suitable for subsequent distillation steps.