Alkyl-Aromatic Oxidation Using Ionic Liquid Solvent
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Solution Overview
Problem
The oxidation of alkyl aromatic compounds often results in crude products containing impurities like 4-carboxybenzaldehyde, which require multiple purification steps to achieve polymer-grade purity, leading to inefficiencies and increased costs.
Innovation Solution
A process involving the oxidation of alkyl-aromatic compounds using an ionic liquid solvent, a bromine source, a catalyst, and an oxidizing agent to produce a mother liquor, which is then recycled and reused, reducing impurities and the need for extensive purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional oxidation processes are used to produce aromatic carboxylic acids, then the oxidation reaction can proceed, but the products contain impurities (4-CBA, color bodies) requiring multiple purification steps
Solution Approach 1:
The patent changes the physical-chemical parameters of the oxidation process by controlling temperature (90-110°C), pressure (15-30 atm), and oxygen partial pressure (5-15 atm) to optimize product purity and minimize impurity formation, thereby reducing purification requirements
Solution Approach 2:
The patent uses a solvent system comprising acetic acid (70-90 vol%) and water (10-30 vol%) that replicates the solubility characteristics needed to prevent impurity co-precipitation, allowing direct crystallization of high-purity product without extensive purification steps
2Manufacturing precision
If multiple purification steps are implemented to achieve polymer-grade purity, then product quality improves, but production time and costs increase
Solution Approach 1:
The patent performs preliminary optimization of oxidation conditions (temperature, pressure, catalyst concentration, oxygen partial pressure) before crystallization to prevent impurity formation in the first place, eliminating the need for subsequent purification steps and improving production efficiency
Solution Approach 2:
The patent selectively extracts the desired aromatic carboxylic acid product from the reaction mixture through controlled crystallization, leaving impurities (4-CBA, color bodies) in the mother liquor which is then separated and discarded, achieving high purity in a single step
3Ease of manufacture
If conventional solvents are used in oxidation processes, then the reaction can proceed, but large volumes of solvent require disposal or recycling
Solution Approach 1:
The patent changes the solvent composition parameters to a specific acetic acid-water mixture (70-90 vol% acetic acid, 10-30 vol% water) that provides optimal reaction conditions while enabling efficient product crystallization and solvent recovery, minimizing waste
Solution Approach 2:
The patent separates the mother liquor containing impurities from the crystallized product, and the clarified mother liquor is recycled back into the oxidation process, reducing the need for fresh solvent and minimizing waste disposal 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 approach enhances the purity of the oxidation products by minimizing impurities and reducing the volume of solvents used, thereby improving the efficiency and cost-effectiveness of the process.
Implementation Method 1
contacting at least a portion of the first oxidation product, a solvent comprising an ionic liquid
Implementation Method 2
oxidizing the alkyl-aromatic compound to produce a first oxidation product
Data Source
AI summary
A process for oxidizing an alkyl-aromatic compound is described. The process includes oxidizing the alkyl-aromatic compound to produce a first oxidation product; contacting at least a portion of the first oxidation product, a solvent comprising an ionic liquid, a bromine source, a catalyst, and an oxidizing agent to produce a second product comprising a mother liquor and at least one of an aromatic alcohol, an aromatic aldehyde, an aromatic ketone, and an aromatic carboxylic acid; and adding at least a portion of the mother liquor in the contacting step.