Ionic Liquid Solvent Oxidation for High-Purity Aromatic Acids
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Solution Overview
Problem
Current processes for oxidizing alkyl aromatic compounds, such as terephthalic acid production, face challenges with impurities like 4-carboxybenzaldehyde and require multiple purification steps, which are costly and inefficient, especially in achieving high purity levels.
Innovation Solution
A process involving the use of ionic liquids as solvents, combined with bromine sources and catalysts like cobalt and manganese, in multiple oxidation zones to produce and recycle mother liquors, facilitating the production of high-purity aromatic carboxylic acids by controlling reaction conditions and impurity separation.
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 impurities such as 4-CBA and color bodies are generated requiring multiple costly purification steps
Solution Approach 1:
The invention changes the chemical parameters of the oxidation system by introducing ionic liquids as solvents and using specific metal catalysts (cobalt, manganese) with bromide promoters. This parameter change modifies the reaction pathway to reduce impurity formation, particularly 4-CBA, thereby achieving higher product purity with fewer purification steps
Solution Approach 2:
The ionic liquid acts as an intermediary medium that facilitates the oxidation reaction while controlling impurity formation. The specific ionic liquid composition mediates between the oxidizing agents and substrate, enabling selective oxidation that minimizes side reactions producing impurities like 4-CBA and color bodies
2Manufacturing precision
If multiple purification steps are implemented to remove impurities, then product purity increases, but process cost and time consumption increase
Solution Approach 1:
The invention performs preliminary action by optimizing the oxidation reaction conditions in advance to minimize impurity formation during the reaction itself. By using ionic liquids and specific catalyst combinations, the reaction produces fewer impurities initially, reducing the need for extensive downstream purification and thereby saving time
3Ease of manufacture
If conventional solvents and catalysts are used, then the oxidation process is simple, but impurity removal requires additional processing steps
Solution Approach 1:
The invention uses composite material systems including ionic liquids composed of specific cation-anion pairs, combined with metal catalysts and bromide promoters. This composite approach creates a synergistic system where the ionic liquid solvent, catalyst, and promoter work together to achieve both process simplicity and high product purity by controlling impurity formation at the source
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 enables the production of high-purity alkyl aromatic compounds with reduced impurities, specifically lowering 4-CBA levels, and allows for efficient recycling of ionic liquids, thereby improving the overall efficiency and cost-effectiveness of the oxidation process.
Implementation Method 1
contacting the alkyl-aromatic compound, a solvent comprising an ionic liquid
Implementation Method 2
a catalyst, and an oxidizing agent in a first reaction zone
Implementation Method 3
oxidizing agent in a first reaction zone to produce a first product comprising a first mother liquor and at least one of an aromatic alcohol, an aromatic aldehyde, an aromatic ketone, and an aromatic carboxylic acid
Data Source
AI summary
A process for oxidizing an alkyl-aromatic compound is described. The process includes contacting the alkyl-aromatic compound, a solvent comprising an ionic liquid, a bromine source, a catalyst, and an oxidizing agent in a first reaction zone to produce a first product comprising a first mother liquor and at least one of an aromatic alcohol, an aromatic aldehyde, an aromatic ketone, and an aromatic carboxylic acid.