Levulinic Acid Mineral Acid Removal via Aqueous Wash
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Solution Overview
Problem
Current methods for producing levulinic acid face challenges such as low yields, high production costs, and the need to separate pure levulinic acid from acidic byproducts like sulfuric acid, which can catalyze side reactions and complicate purification.
Innovation Solution
A method involving a levulinic acid composition treated with an aqueous solution of monosaccharides or disaccharides to partition into an organic phase, reducing the mineral acid content and using a continuous counter-current liquid-liquid extraction process to isolate levulinic acid with reduced mineral acid levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If liquid-liquid extraction is used to extract levulinic acid into an organic solvent, then extraction efficiency is improved, but sulfuric acid is also extracted into the organic solvent causing side reactions
Solution Approach 1:
An aqueous wash solution is introduced as an intermediary substance to selectively remove sulfuric acid from the organic extraction solvent. The wash solution acts as a mediator that transfers sulfuric acid from the organic phase to the aqueous phase through liquid-liquid extraction, preventing the harmful acid from catalyzing side reactions in subsequent processing steps.
Solution Approach 2:
The invention changes the chemical composition parameters of the washing solution by selecting specific aqueous solutions (such as water or dilute acid solutions) that have different extraction affinities for sulfuric acid compared to levulinic acid. This parameter change enables selective removal of sulfuric acid while preserving levulinic acid in the organic phase.
2Device complexity
If mineral acid is not removed from the organic extraction solvent, then the extraction process is simple, but there are considerable yield losses due to side reactions
Solution Approach 1:
A wash step with aqueous solution is introduced as an intermediary purification step between extraction and subsequent processing. This additional step, while increasing process complexity, prevents substantial yield losses by removing sulfuric acid that would otherwise catalyze degradation reactions of levulinic acid and solvent during distillation and storage.
3Ease of manufacture
If distillation is performed at moderate to high temperatures to purify the extraction solvent, then solvent recovery is achieved, but side reactions are catalyzed by residual mineral acid
Solution Approach 1:
The sulfuric acid removal step is performed preliminarily before distillation. By removing the acid catalyst beforehand, subsequent distillation operations can be conducted at moderate temperatures without fear of acid-catalyzed side reactions, making the overall process safer and more efficient.
Solution Approach 2:
The aqueous wash solution serves as an intermediary treatment that eliminates the harmful sulfuric acid before the thermal processing step. This intermediate purification protects the levulinic acid and solvent from degradation during the subsequent distillation process.
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 enhances the yield and purity of levulinic acid by significantly reducing mineral acid levels, preventing side reactions and improving the levulinic acid to acid catalyst weight ratio, thereby optimizing the production process.
Implementation Method 1
partitioning the mixture into an aqueous phase and an organic phase, wherein the mineral acid in the organic phase is reduced relative to the amount in the levulinic acid composition
Data Source
AI summary
The invention describes processes to selectively remove or reduce the mineral acid content substantially from compositions comprising a solvent and levulinic acid, wherein the levulinic acid was derived from the reaction between various biomass materials and a mineral acid or an organic acid catalyst.