3-Hydroxypropionic Acid Recovery with Ion Removal and Vacuum Distillation
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Solution Overview
Problem
Efficient recovery of 3-hydroxypropionic acid (3HP) in desired concentrations and purity for industrial applications is challenging, particularly at commercial scales, as existing methods lead to undesired impurities like acrylic acid and are not scalable from lab bench to commercial production.
Innovation Solution
A method involving pH adjustment, ion concentration reduction, and controlled distillation under vacuum and heat to recover 3-hydroxypropionic acid with reduced impurities, including steps to remove sulfate and phosphate ions and use gentle distillation techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional recovery methods are used to concentrate 3HP, then recovery concentration increases, but acrylic acid impurity increases due to dehydration
Solution Approach 1:
The patent applies preliminary action by removing sulfate and phosphate ions from the fermentation broth before the distillation step. This pre-treatment prevents ion-catalyzed dehydration of 3HP to acrylic acid during distillation, allowing high concentration recovery without impurity formation. The ion removal step is performed beforehand to create favorable conditions for the subsequent concentration process.
Solution Approach 2:
The patent employs parameter changes by carefully controlling pH levels (maintaining pH between 1-3 during distillation) and temperature conditions. These parameter adjustments optimize the distillation process to concentrate 3HP while minimizing dehydration reactions. The pH control is particularly critical as it affects both the volatility of 3HP and the rate of dehydration to acrylic acid.
2Manufacturing precision
If lab bench separation techniques are used, then purity is achieved, but scalability to commercial production is not feasible
Solution Approach 1:
The patent applies segmentation by dividing the recovery process into distinct functional stages: (1) ion removal step to eliminate interfering substances, (2) distillation step for concentration and purification, and (3) optional extraction step for final purification. This segmented approach allows each step to be optimized independently and scaled to commercial production levels while maintaining product purity.
Solution Approach 2:
The patent replaces complex mechanical separation systems with a more straightforward chemical and thermal process. Instead of relying on complex mechanical separations that work at lab scale, the invention uses ion exchange chemistry and distillation thermodynamics, which scale more effectively to commercial production while achieving comparable or superior purity.
3Productivity
If aggressive distillation conditions are applied, then recovery speed increases, but dehydration to acrylic acid increases
Solution Approach 1:
The patent applies preliminary action by removing sulfate and phosphate ions from the fermentation broth before the distillation step. This pre-treatment eliminates ion-catalyzed dehydration pathways, allowing aggressive distillation conditions to be applied without forming acrylic acid impurities. The ion removal step is performed beforehand to create favorable conditions for the subsequent rapid concentration process.
Solution Approach 2:
The patent converts the potentially harmful effect of ion presence into a benefit by using ion exchange resins to selectively remove interfering ions. The ions that would otherwise catalyze dehydration are instead captured and removed by the ion exchange process, transforming a harmful factor into a controlled variable that prevents impurity formation during rapid distillation.
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 method achieves 3-hydroxypropionic acid recovery at concentrations of at least 30% by weight with less than 5 parts by weight acrylic acid per 100 parts, enhancing purity and scalability.
Implementation Method 1
distilling the reduced ion aqueous solution at a pH of from about 1 to about 3 by applying vacuum and heat to the reduced ion aqueous solution to form an aqueous distillation product comprising 3-hydroxypropionic acid
Implementation Method 2
applying vacuum and heat to the reduced ion aqueous solution to form an aqueous distillation product
Data Source
AI summary
A method for recovering a composition enriched in 3-hydroxypropionic acid from a fermentation broth comprising 3-hydroxypropionic acid and/or salts thereof comprises the steps of: (a) providing the fermentation broth having a pH of from about 2 to about 8 comprising: 3-hydroxypropionic acid and/or salts thereof, (b) acidifying the fermentation broth; (c) reducing the total sulfate ion and phosphate ion (d) distilling the resulting reduced ion aqueous solution and (e) recovering the product.