Acidic Ionic Liquid Catalyst for Phenol Production
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Solution Overview
Problem
The production of phenol from cyclohexylbenzene hydroperoxide is challenging due to difficulties in oxidation, exothermic reactions, by-product formation, and the use of sulfuric acid, which is corrosive and requires additional processing steps, whereas the cumene-based Hock process faces hazards with concentrated hydroperoxide and by-product management.
Innovation Solution
A process using an acidic ionic liquid catalyst for the cleavage of cyclohexylbenzene hydroperoxide to produce phenol and cyclohexanone, which is more selective and safer than sulfuric acid, with the catalyst being immiscible and separable without neutralization, allowing for controlled reaction conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sulfuric acid is used for cyclohexylbenzene hydroperoxide cleavage, then the cleavage reaction can proceed, but the process becomes corrosive and requires additional neutralization steps
Solution Approach 1:
The patent uses solid acid catalysts (such as ion-exchange resins, zeolites, or metal oxides) as intermediaries to catalyze the cleavage reaction instead of directly using sulfuric acid. These solid catalysts provide the necessary acid functionality while being easily separable from the reaction mixture, eliminating corrosion issues and the need for neutralization steps. The solid acid acts as a mediator that enables the reaction without introducing the harmful properties of liquid sulfuric acid.
2Productivity
If concentrated cyclohexylbenzene hydroperoxide is used for cleavage, then the reaction efficiency increases, but the exothermic nature becomes more hazardous
Solution Approach 1:
The patent employs solid acid catalysts that enable effective cleavage at lower hydroperoxide concentrations or with better heat dissipation control. The solid catalyst provides high surface area and distributed active sites that facilitate the reaction at controlled rates, allowing the process to proceed efficiently without the dangerous exothermic runaway that occurs with concentrated hydroperoxide and liquid acid catalysts.
3Reliability
If cyclohexylbenzene hydroperoxide is diluted with hydrocarbon, then safety is improved, but the cleavage rate decreases due to limited sulfuric acid solubility
Solution Approach 1:
The patent changes the physical state parameter of the acid catalyst from liquid (sulfuric acid) to solid form. This parameter change allows the catalyst to function effectively in diluted hydrocarbon systems where liquid sulfuric acid would have limited solubility. The solid acid catalyst maintains high activity even when dispersed in diluted reaction mixtures, thus preserving cleavage rate while allowing safe operation with diluted hydroperoxide.
4Productivity
If cumene hydroperoxide is concentrated to greater than 80% for cleavage, then the process efficiency improves, but handling hazards and by-product formation increase
Solution Approach 1:
The patent introduces solid acid catalysts as intermediaries that enable effective cleavage at lower hydroperoxide concentrations. Unlike liquid sulfuric acid that requires high concentration for efficiency, solid acid catalysts provide sufficient catalytic activity even when the hydroperoxide is diluted, thus eliminating the need to concentrate to greater than 80% and the associated handling hazards.
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 achieves high selectivity and activity for phenol and cyclohexanone production, reducing operational costs and environmental impact by eliminating the need for sulfuric acid and simplifying product separation.
Implementation Method 1
A process using an acidic ionic liquid catalyst for the cleavage of cyclohexylbenzene hydroperoxide to produce phenol and cyclohexanone
Implementation Method 2
the catalyst being immiscible and separable without neutralization
Implementation Method 3
the catalyst being immiscible and separable without neutralization
Data Source
AI summary
In a process for producing phenol, a feed comprising cyclohexylbenzene hydroperoxide is contacted with a cleavage catalyst comprising an acidic ionic liquid under cleavage conditions effective to cleave at least a portion of said cyclohexylbenzene hydroperoxide and produce a cleavage product stream comprising phenol and cyclohexanone.