Ferulic Acid Purification via Selective Solvent Extraction
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Solution Overview
Problem
Current methods for purifying ferulic acid often result in low purity due to contamination from water-soluble impurities, use of toxic solvents, or significant product loss, making them inefficient and economically unviable for industrial applications.
Innovation Solution
A method involving selective solvent dissolution, pre-crystallization, and subsequent purification using a synthetic resin followed by crystallization and drying to achieve high purity ferulic acid and/or its salts, with the option to reuse solvents and mother liquor, effectively removing impurities and achieving purity ranging from 98 to 99.9%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If water recrystallization is used to purify ferulic acid, then the process is simple and inexpensive, but water-soluble impurities (polysaccharides, hemicelluloses, lignins) co-crystallize with ferulic acid resulting in low purity
Solution Approach 1:
The patent extracts ferulic acid from the aqueous solution using an organic solvent (ethyl acetate, n-butanol, or n-amyl alcohol). This separation step removes ferulic acid from water-soluble impurities like polysaccharides, hemicelluloses, and lignins that cannot be extracted into the organic phase, thereby achieving high purity while maintaining process simplicity
Solution Approach 2:
The patent changes the pH parameter of the aqueous solution to optimize ferulic acid extraction. By adjusting pH to acidic conditions (pH 2-4), ferulic acid is protonated and becomes extractable into the organic solvent, while impurities remain in the aqueous phase. This parameter adjustment enables effective separation and high purity recovery
2Manufacturing precision
If toxic organic solvents (methanol, ethyl ether) are used for extraction and purification, then high purity ferulic acid can be obtained, but the process is unsafe and not permitted in the food industry
Solution Approach 1:
The patent replaces toxic, persistent solvents (methanol, ethyl ether) with safer, biodegradable alternatives such as ethyl acetate, n-butanol, or n-amyl alcohol. These solvents achieve the same purification effect but are approved for food industry use, eliminating toxicity concerns while maintaining high purity standards
Solution Approach 2:
The patent optimizes extraction parameters including pH control (pH 2-4), temperature (20-40°C), and solvent-to-feed ratio to maximize ferulic acid recovery using safe solvents. These parameter adjustments ensure that benign solvents achieve purification effectiveness comparable to or exceeding toxic solvents
3Manufacturing precision
If anionic exchange resins are used for purification, then ferulic acid can be concentrated, but 20-50% product loss occurs due to chemical selectivity and retention on the resin
Solution Approach 1:
The patent uses liquid-liquid extraction with organic solvents to transfer ferulic acid from the aqueous phase to the organic phase. This physical extraction method avoids chemical interaction with solid resins, eliminating the 20-50% product loss associated with anionic exchange resins while achieving effective concentration and purification
Solution Approach 2:
The patent uses an organic solvent as an intermediary medium to transfer ferulic acid from the aqueous solution to a concentrated form. This intermediary approach avoids direct contact with anionic exchange resins, preventing chemical retention and loss of ferulic acid while achieving the desired concentration effect
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 high purity ferulic acid and/or its salts with a yield of up to 70%, overcoming contamination and product loss issues, and allowing for safe use in food, cosmetics, and pharmaceutical industries.
Implementation Method 1
subsequent purification using a synthetic resin
Implementation Method 2
crystallization and drying to achieve high purity ferulic acid
Implementation Method 3
selective solvent dissolution
Data Source
Figure 1
AI summary
Methods to purify ferulic acid and/or salts thereof, both in solid state as in solution, said methods include: dissolve the ferulic acid, with a selective organic solvent, recover and isolate the solution from the insoluble impurities with filters; recover the organic solvent evaporating the solution; mix the concentrated extract of ferulic acid with water to pre-crystallize the hydrosoluble impurities; evaporate the mixture to remove the remains of the organic solvent; concentrate the mixture free of solvent in an evaporator; cool the mixture down to 40 °C; let the concentrated mixture set for 1 h, to then isolate by sedimentation the water-insoluble impurities; re-heat the mixture free of impurities to 70 °C; purify the mixture through a synthetic resin, transfer the purified mixture to a crystallizing container to crystallize the ferulic acid; remove the mother liquor of crystallization of the precipitate of ferulic acid; dry the ferulic acid.