Sorbic Acid Production via Enzymatic Ring-Opening
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Solution Overview
Problem
Existing methods for producing sorbic acid and 1,3-pentadiene are hindered by the formation of unwanted by-products and yield losses during decomposition and solid-liquid separation steps, making them less than ideal for commercial production.
Innovation Solution
A method involving the acid-catalyzed ring-opening of 6-methyl-5,6-dihydro-2-pyrone (parasorbic acid) using a renewable precursor, 4-hydroxy-6-methyl-2-pyrone, with solid acid catalysts to produce sorbic acid and 1,3-pentadiene, allowing for a bio-renewable platform for value-added chemicals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the intermediate polyester is decomposed by treating with strong acid or base or via heat, then the decomposition step can be performed, but unwanted colored by-products are formed
Solution Approach 1:
The patent changes the decomposition method from thermal or strong acid/base treatment to enzymatic decomposition using esterases or lipases. This parameter change in the decomposition mechanism eliminates the formation of colored by-products while maintaining effective decomposition of the polyester intermediate to produce sorbic acid.
Solution Approach 2:
The patent replaces the mechanical/chemical decomposition system (heat or strong acid/base) with a biological enzymatic system. The enzymes catalyze the decomposition reaction under mild conditions, substituting the harsh mechanical/chemical approach with a selective biological process that avoids by-product formation.
2Manufacturing precision
If multiple purification steps are required to yield the highest grades of product, then food grade sorbate can be produced, but the process complexity and cost increase
Solution Approach 1:
The enzymatic decomposition process inherently produces high-purity sorbic acid without requiring multiple purification steps. The enzyme-catalyzed reaction is highly selective, and the resulting mixture can be directly neutralized and crystallized to obtain food-grade product, allowing the process to self-produce purified product without complex external purification equipment.
Solution Approach 2:
The patent extracts the decomposition function from the traditional multi-step process and performs it selectively using enzymes. This extraction of the key transformation step, performed under mild conditions, eliminates the need for subsequent complex purification operations that would otherwise be required to remove colored by-products from harsh decomposition methods.
3Manufacturing precision
If solid-liquid separation steps are performed to isolate crude sorbic acid, then the product can be purified, but yield losses occur
Solution Approach 1:
The patent changes the separation approach by performing enzymatic decomposition in a medium that facilitates direct product isolation. The use of immobilized enzymes on solid supports allows for easy separation of the catalytic system from the reaction mixture, and the resulting sorbic acid can be directly crystallized from the filtrate without losing material in multiple solid-liquid separation steps.
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 reduces by-product formation and yield losses, enabling the production of high-grade sorbic acid and 1,3-pentadiene with improved selectivity and efficiency, utilizing renewable resources and minimizing environmental impact.
Implementation Method 1
acid-catalyzed, ring-opening of 6-methyl-5,6-dihydro-2-pyrone
Data Source
AI summary
Described is a method of making sorbic acid, pentadiene, or 3-penten-2-one. The method includes partially hydrogenating 4-hydroxy-6-methyl-2-pyrone (HMP) to yield 5,6-dihydro-4-hydroxy-6-methyl-2H-pyran-2-one (4-DHMMP). Then, if 3-penten-2-one is desired, thermally decomposing the 4-DHMMP to yield 3-penten-2-one. If sorbic acid or pentadiene are desired, the 4-DHMMP is hydrogenated to yield 4-hydroxy-6-methyltetrahydro-2-pyrone (4-HMTHP). The 4-HMTHP is then dehydrated by contacting it with a solid acid catalyst to yield parasorbic acid (PSA). The PSA can then be ring-opened by contacting it with a solid acid catalyst. The reaction conditions of the ring-opening reaction can be controlled to yield sorbic acid and/or pentadiene.