Cyclic Imide Catalyst Oxidation Selectivity
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Solution Overview
Problem
Current oxidation processes for sec-butylbenzene and cyclohexylbenzene are sensitive to impurities and lack selectivity, making them inefficient for commercial-scale production of phenol and methyl ethyl ketone or cyclohexanone.
Innovation Solution
A process involving the oxidation of alkylaromatic compounds using a cyclic imide catalyst at specific temperature and concentration ranges, without the presence of alkaline metal compounds, to achieve high conversion rates and selectivity to the corresponding hydroperoxides, which are then converted to phenol and ketones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing oxidation processes are used for sec-butylbenzene and cyclohexylbenzene, then oxidation can occur, but the processes are sensitive to impurities and lack selectivity
Solution Approach 1:
The patent applies parameter changes by optimizing the catalyst structure (using specific cyclic imides with defined molecular weights and functional groups), reaction temperature (70-200°C range), pressure (0.5-10 atm), and oxygen concentration to achieve high selectivity while reducing impurity sensitivity. The specific parameters of the cyclic imide catalyst (molecular weight 100-500, with or without carboxylic acid groups) are carefully controlled to resolve the contradiction between selectivity and impurity sensitivity.
2Productivity
If conventional oxidation methods are used, then oxidation reaction can proceed, but conversion rates are insufficient for commercial-scale production
Solution Approach 1:
The patent uses a cyclic imide compound as an intermediary catalyst to facilitate the oxidation reaction. The catalyst mediates between the alkylaromatic substrate and oxygen, enabling high conversion rates while maintaining selectivity to hydroperoxide. The cyclic imide acts as a mediator that lowers the activation energy barrier and provides a selective pathway for hydroperoxide formation, resolving the contradiction between productivity and reliability.
3Productivity
If alkylaromatic compounds are oxidized to hydroperoxides, then phenol and ketone products can be produced, but the process lacks efficiency for commercial production
Solution Approach 1:
The patent optimizes multiple parameters simultaneously to achieve commercial-scale efficiency: catalyst molecular weight (100-500), catalyst structure (with or without carboxylic acid groups), reaction temperature (70-200°C), pressure (0.5-10 atm), and oxygen partial pressure (0.1-1.0 atm). These coordinated parameter changes enable both high productivity and manufacturing precision required for commercial production.
Solution Approach 2:
The patent replaces conventional oxidation methods with a catalyst-based chemical system. Instead of relying on harsh conditions or stoichiometric reagents, the cyclic imide catalyst provides a selective chemical pathway that substitutes less efficient conventional approaches, enabling both high productivity and precision in a single oxidation step.
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 commercially viable conversion rates and high selectivity to hydroperoxides, enabling efficient production of phenol and ketones with reduced sensitivity to impurities, thus addressing the inefficiencies of existing methods.
Implementation Method 1
contacting an alkylaromatic compound to the corresponding hydroperoxide, the process comprising contacting an alkylaromatic compound of general formula (I)... with oxygen in the presence of a catalyst comprising a cyclic imide of the general formula (II)... said contacting oxidizing at least part of the alkylaromatic in said feed to the corresponding alkylaromatic hydroperoxide
Implementation Method 2
oxidation of alkylaromatic compounds... contacting an alkylaromatic compound... with oxygen... said contacting oxidizing at least part of the alkylaromatic in said feed to the corresponding alkylaromatic hydroperoxide
Data Source
AI summary
In a process for oxidizing an alkylaromatic compound to the corresponding hydroperoxide, a feed comprising an alkylaromatic compound is contacted with an oxygen-containing gas in the presence of a catalyst comprising a cyclic imide. The contacting is conducted at a temperature of about 90° C. to about 150° C., with the cyclic imide being present in an amount between about 0.05 wt % and about 5 wt % of the alkylaromatic compound in the feed and the catalyst being substantially free of alkali metal compounds. The contacting oxidizes at least part of the alkylaromatic compound in said feed to the corresponding hydroperoxide.