(3R)-Hydroxybutyl (3R)-Hydroxybutanoate Purification via Segmented Extraction
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Solution Overview
Problem
There is a need for an efficient process to synthesize and purify (R)-3-hydroxybutyl (R)-3-hydroxybutanoate, a compound with pharmaceutical and nutritional properties, from fermentation broths, as existing methods are inadequate in isolating and purifying this compound effectively.
Innovation Solution
The process involves separating a liquid fraction enriched in (R)-3-hydroxybutyl (R)-3-hydroxybutanoate from a solid fraction, removing salts and water, and purifying it through distillation and liquid-liquid extraction, using immobilized enzymes and specific acids as catalysts in esterification reactions, followed by distillation and polishing steps to achieve high purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional purification methods are used for isolating (R)-3-hydroxybutyl (R)-3-hydroxybutanoate from fermentation broth, then the isolation process is simplified, but the purity and yield of the final product are insufficient
Solution Approach 1:
The purification process is divided into multiple sequential stages: initial filtration to remove cells, liquid-liquid extraction to concentrate the product, distillation to separate by boiling point, and polishing steps to achieve final purity. Each stage targets specific impurities and progressively enhances product quality without requiring overly complex single-step methods
Solution Approach 2:
An intermediary solvent system is introduced in the liquid-liquid extraction step to facilitate selective separation of (R)-3-hydroxybutyl (R)-3-hydroxybutanoate from the fermentation broth. This intermediary medium enables efficient transfer of the target compound while leaving behind unwanted impurities, achieving high purity without direct complex purification
2Manufacturing precision
If multiple purification steps are implemented to achieve high purity, then the product quality improves, but the processing time and operational complexity increase
Solution Approach 1:
The purification process is designed as a continuous sequence of operations where the output of one step becomes the input of the next without interruption. The liquid-liquid extraction continuously transfers product to the organic phase, followed by continuous distillation and polishing steps, maintaining productive action throughout and minimizing idle time between operations
Solution Approach 2:
Preliminary filtration to remove cellular material is performed before the main purification sequence, and preliminary concentration is achieved through the liquid-liquid extraction step. These preliminary actions prepare the material in advance for the final distillation and polishing steps, reducing the time and complexity of subsequent operations
3Quantity of substance
If conventional isolation methods are used, then the process is simpler to operate, but the recovery yield of (R)-3-hydroxybutyl (R)-3-hydroxybutanoate is low
Solution Approach 1:
The liquid-liquid extraction uses an intermediary solvent system that selectively dissolves (R)-3-hydroxybutyl (R)-3-hydroxybutanoate from the aqueous fermentation broth. This intermediary extraction step concentrates the product and separates it from most impurities, achieving high recovery yield while maintaining relatively simple operational procedures
Solution Approach 2:
The process exploits phase transitions between aqueous and organic phases during liquid-liquid extraction, and between liquid and vapor phases during distillation. These phase transitions enable selective separation and concentration of the target compound, maximizing recovery yield through natural physical properties rather than complex chemical reactions or operations
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 isolates and purifies (R)-3-hydroxybutyl (R)-3-hydroxybutanoate, achieving high purity levels and providing a sustainable method for producing this compound, which is essential for nutritional and pharmaceutical applications.
Implementation Method 1
The compound may be made by the processes disclosed in US 2016/0108442, which is incorporated in its entirety
Implementation Method 2
performing a first esterification between HOR and a compound of Formula (I) to form the compound of Formula (II)
Implementation Method 3
purifying (R)-3-hydroxybutyl (R)-3-hydroxybutanoate by distillation
Implementation Method 4
purifying (3R)-hydroxybutyl (3R)-hydroxybutyrate by liquid-liquid extraction
Implementation Method 5
removing water from said liquid fraction
Data Source
AI summary
A process for synthesizing (R)-3 -hy droxybutyl (R)-3 -hy droxybutanoate from ethyl (R)-3-hydroxybutanoate and (R)-1,3-butanediol, as well a process for synthesizing (R)-3-hy droxybutyl (R)-3-hy droxybutanoate from (R)-3-hydroxybutyric acid and (R)-1,3-butanediol. Also provided are processes for isolating (R)-3-hy droxybutyl (R)-3-hy droxybutanoate, including from a fermentation broth.