Vitamin A Intermediate Synthesis via Sulfur Dioxide Reaction
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Solution Overview
Problem
Current synthesis processes for vitamin A and its derivatives are complex and require improved methods for production, particularly in accessing easily accessible intermediates for efficient conversion.
Innovation Solution
A process involving the reaction of compounds of formula (II) with SO2 in an alcohol solvent, without aromatic or chlorinated solvents, to produce intermediates of formula (I), which are used to synthesize vitamin A or β-carotene derivatives, utilizing an excess of SO2 and stabilizers like butylated hydroxytoluene, at elevated temperatures and pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If aromatic or chlorinated solvents are used in the reaction, then the reaction efficiency and intermediate accessibility are improved, but the environmental harm and ecological impact worsen
Solution Approach 1:
The patent replaces harmful aromatic and chlorinated solvents with aliphatic solvents (such as hexane, heptane, or their mixtures), which have favorable environmental properties. This substitution maintains reaction efficiency while eliminating the ecological downsides of traditional solvents, effectively converting a harmful process into a beneficial one by choosing greener alternative solvents that achieve the same technical results without environmental damage.
2Manufacturing precision
If complex synthesis processes are used for vitamin A production, then the product quality and purity are improved, but the process complexity and manufacturing difficulty worsen
Solution Approach 1:
The patent extracts and isolates the key intermediate compounds (formulas I and II) through a simplified reaction pathway using aliphatic solvents. By focusing on obtaining these specific intermediates through a streamlined process rather than pursuing complete vitamin A synthesis, the method reduces overall process complexity while maintaining the ability to produce high-purity final products through subsequent standardization steps.
3Productivity
If elevated temperatures and pressures are applied, then the reaction speed and intermediate yield are improved, but the energy consumption increases
Solution Approach 1:
The patent utilizes aliphatic solvents with favorable boiling points and physical properties that allow the reaction to proceed efficiently at moderate temperatures and pressures. The specific choice of aliphatic solvent parameters (boiling point, viscosity, stability) enables optimization of the energy-input versus yield-output relationship, achieving high intermediate yields without excessive energy consumption by carefully selecting solvent parameters that match the reaction 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 provides improved accessibility and efficiency in producing vitamin A and its derivatives, reducing environmental impact by avoiding harmful solvents and achieving high yields of suitable intermediates for further synthesis.
Implementation Method 1
a compound of formula (II) is reacted with SO2 in at least one alcohol as solvent
Implementation Method 2
The reaction mixture was heated at 70° C. for 14 hours
Implementation Method 3
The pressure was released, the reactor was purged with nitrogen and all volatile material was evaporated under reduced pressure
Data Source
AI summary
The present invention relates to a new process for the production of specific intermediates, which are preferably used in the production of vitamin A, vitamin A acetate, or β-carotene and derivatives thereof, e.g. canthaxanthin, astaxanthin or zeaxanthin.