Ferulic Acid Purification via pH-Controlled Precipitation
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Solution Overview
Problem
Current methods for purifying ferulic acid often result in low yields and product quality due to the presence of impurities, which can cause fouling in industrial processes and react with reactants or final products, leading to decreased production yields, especially in the production of natural vanillin.
Innovation Solution
A process involving the use of a first complexing agent to precipitate out impurities from a liquid medium containing ferulic acid, followed by separation to obtain a purified ferulic acid with a purity of greater than 90%, and optionally using a second complexing agent to further purify the medium, allowing for the recovery of ferulic acid in solid form without the need for excessive filtration steps or organic solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional purification methods are used, then ferulic acid can be obtained, but the purity is insufficient and yield is low due to impurities causing fouling and unwanted reactions
Solution Approach 1:
The patent employs sequential pH adjustments to control the solubility and precipitation behavior of ferulic acid and its impurities. By adjusting pH to specific ranges (first to 2-4, then to 7-9), the process selectively precipitates different components, achieving both high purity (>90%) and high yield (>85%) through parameter optimization rather than multiple purification steps
Solution Approach 2:
The patent selectively removes impurities from the ferulic acid solution through controlled precipitation. By adjusting pH conditions, impurities are precipitated out while ferulic acid remains in solution, allowing selective extraction of the desired product without excessive filtration or organic solvent use
2Manufacturing precision
If multiple purification steps are used to increase purity, then ferulic acid purity improves, but process complexity and time increase
Solution Approach 1:
The patent combines multiple purification objectives into a single integrated process. By merging precipitation, filtration, and concentration steps into one operational sequence with pH adjustment as the controlling parameter, the process achieves >90% purity without requiring separate organic extraction, activated carbon treatment, or recrystallization steps
Solution Approach 2:
The patent uses pH as a master control parameter to drive multiple purification functions simultaneously. By changing pH from acidic (2-4) to neutral/alkaline (7-9) ranges, the process controls solubility, precipitation, and separation in a single operational framework, eliminating the need for multiple dedicated purification units
3Manufacturing precision
If conventional purification methods are used, then ferulic acid is obtained, but organic solvents and excessive filtration are required
Solution Approach 1:
The patent extracts ferulic acid from the aqueous solution through controlled precipitation rather than organic solvent extraction. By adjusting pH to 2-4 and then to 7-9, ferulic acid is selectively precipitated in high purity form, eliminating the need for organic solvents and reducing substance losses to <15%
Solution Approach 2:
The patent uses pH parameter changes to control the solubility and precipitation of ferulic acid, replacing organic solvent-based extraction methods. This approach maintains ferulic acid in the aqueous phase during purification and recovers it through controlled precipitation, minimizing losses and eliminating solvent requirements
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 effectively increases the yield and purity of ferulic acid to greater than 90%, reducing equipment fouling and improving the economic viability by allowing the reuse of impurities as free radical scavengers or stabilizers, while minimizing losses and maintaining environmental sustainability.
Implementation Method 1
a step (a) of bringing the liquid medium C into contact with a first complexing agent, so as to obtain a first precipitate and a liquid medium C1
Implementation Method 2
a step (b) of separation of the first precipitate P1 from the liquid medium C1, so as to obtain a liquid medium F1 comprising purified ferulic acid
Data Source
AI summary
The present invention relates to a method for purifying a liquid medium comprising ferulic acid, a solvent and at least one impurity, the method comprising a step (a) of bringing the liquid medium into contact with a first complexing agent so as to obtain a first precipitate P1 and a liquid medium C1, and a step (b) of separating the first precipitate P1 from the liquid medium C1 so as to obtain a liquid medium F1 comprising purified ferulic acid. The present invention also relates to a method for separating ferulic acid oligomers and to their use as a scavenger of free radicals or radical species, in particular as a polymerisation inhibitor, antioxidant or UV stabiliser.