Lactone Synthesis via Hydroperoxide Phase Separation
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Solution Overview
Problem
Existing processes for preparing lactones are complex and expensive due to the need for isolating hydroperoxide intermediates, which can be unstable and hazardous, and result in environmental concerns from aqueous waste streams.
Innovation Solution
A process involving reacting a bicyclic or monocyclic compound with hydrogen peroxide in the presence of a first acid with a pKa of 3 or less and an organic solvent with less than 5% water, followed by metering the resulting composition to a mixture of a second organic solvent and a dissociation-enhancing catalyst, eliminating the need for hydroperoxide isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If hydroperoxide is isolated through filtering, washing, and drying, then the hydroperoxide can be obtained in pure form for subsequent reaction, but the process becomes complex, expensive, and time-consuming
Solution Approach 1:
The invention extracts only the necessary function (hydroperoxide formation) from the isolation process by using a two-phase system where the organic phase containing the hydroperoxide can be directly fed to the next reaction step without physical isolation. The aqueous phase is separated and discarded, eliminating filtering, washing, and drying steps while maintaining hydroperoxide purity through phase separation.
Solution Approach 2:
The invention merges the hydroperoxide formation step with the subsequent reaction step by directly feeding the organic phase containing the hydroperoxide into the next reactor. This eliminates the isolation step and integrates two previously separate operations into a continuous process, reducing complexity and time.
2Reliability
If hydroperoxide is isolated as a solid precipitate, then it can be handled separately, but it becomes unstable and dangerous
Solution Approach 1:
The invention changes the physical state parameter of the hydroperoxide from solid precipitate to dissolved form in the organic phase. By maintaining the hydroperoxide in solution rather than isolating it as a solid, the stability and safety are improved while ease of operation is maintained through direct feeding to the next step.
Solution Approach 2:
The invention maintains the hydroperoxide in a continuous reactive state within the organic phase, eliminating the interruption and isolation steps that create stability issues. The hydroperoxide is continuously transformed from formation to reaction without being isolated, maintaining its stability through continuous useful action.
3Manufacturing precision
If hydroperoxide isolation steps are performed, then pure hydroperoxide is obtained, but aqueous waste streams are generated requiring further processing
Solution Approach 1:
The invention extracts the hydroperoxide into the organic phase during the reaction itself, using the two-phase system to separate the product from the aqueous environment. This eliminates the need for subsequent washing steps that generate aqueous waste, as the hydroperoxide is already separated in the organic phase.
Solution Approach 2:
The invention discards the aqueous phase containing the harmful waste components after the reaction, while recovering the hydroperoxide in the organic phase. This single separation step eliminates multiple waste streams that would otherwise be generated during isolation, washing, and drying 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 simplifies the process, reduces costs, enhances safety, and minimizes environmental impact by avoiding the need for hydroperoxide isolation, while achieving efficient production of saturated and unsaturated lactones.
Implementation Method 1
reacting a bicyclic compound according to formula (I) or a monocyclic compound according to formula (II) with hydrogen peroxide in the presence of a first acid having a pKa of 3 or less
Implementation Method 2
metering the composition comprising the hydroperoxide to a mixture of a second organic solvent and a dissociation-enhancing catalyst
Data Source
AI summary
The invention relates to a process for preparing saturated or unsaturated lactones. This process involves reacting a bicyclic compound or a monocyclic compound with hydrogen peroxide in the presence of a first acid having a pKa of 3 or less and a first organic solvent, thereby forming a hydroperoxide. The obtained mixture comprising the hydroperoxide is subsequently metered to a mixture of a second organic solvent and a dissociation-enhancing catalyst, optionally comprising a second organic acid. The invention also pertains to a process of preparing the hydroperoxide.