Metal Oxygen-Containing Complex for Pre-Oxidizing Acetone Impurities
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Solution Overview
Problem
Existing methods for producing isopropanol fail to effectively remove reducing oxygen-containing organic impurities, failing to meet the stringent purity requirements for high-end wafer manufacturing with line widths ≤90nm.
Innovation Solution
A metal oxygen-containing complex is used as a pre-oxidant to treat crude materials, particularly acetone, followed by a process involving pre-oxidation, dehydration, refining, and hydrogenation to produce electronic-grade isopropanol, with the complex comprising a transition metal and an oxygen-containing heterocyclic organic compound as a ligand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional variable pressure adsorption separation process is used, then the production process can be implemented, but the trace organic impurities cannot be effectively removed and the process becomes complicated
Solution Approach 1:
The patent applies preliminary action by introducing a pre-oxidation step before the main hydrogenation process. The pre-oxidation processor treats the acetone feedstock to remove reducing impurities (aldehydes, alcohols, ketones) before they enter the hydrogenation reactor, thereby preventing their formation in the final isopropanol product and simplifying subsequent purification steps
Solution Approach 2:
The patent changes the chemical state of impurities through oxidation, converting reducing impurities into oxidized forms that can be more easily removed. The pre-oxidation processor uses oxidation reactions to transform aldehydes, alcohols, and ketones into carboxylic acids or other oxidized products that have different physical and chemical properties, enabling their separation
2Manufacturing precision
If multiple purification steps (molecular sieve dehydration, resin dehydration, reverse osmosis, high-temperature distillation, ion exchange, cyclic adsorption-filtration) are used, then high purity isopropanol can be obtained, but trace organic impurities are still not removed and it cannot meet high-end wafer manufacturing requirements
Solution Approach 1:
The pre-oxidation step is performed in advance to remove reducing impurities from the acetone feedstock before hydrogenation. This preliminary treatment ensures that the subsequent hydrogenation process does not generate reducing impurities in the isopropanol product, thereby meeting the stringent requirements of high-end wafer manufacturing (line width ≤90nm)
Solution Approach 2:
The patent converts the harmful reducing impurities (aldehydes, alcohols, ketones) into beneficial oxidized products through the pre-oxidation process. By oxidizing these impurities to carboxylic acids or other oxidized forms, they become easier to remove and no longer pose a threat to the purity of the final isopropanol product
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
The process achieves isopropanol with organic impurities below 5ppm, meeting high-end wafer manufacturing standards for anions, cations, particle content, and water content, while using readily available acetone and maintaining mild reaction conditions with minimal raw material loss and by-products.
Implementation Method 1
using the metal oxygen-containing complex as a pre-oxidant to pre-oxidize impurities to obtain pre-oxidized acetone
Implementation Method 2
a process for hydrogenating acetone to produce electronic-grade isopropanol
Data Source
Figure 1
AI summary
The present invention provides a metal oxygen-containing complex, which comprises a transition metal element as central atom and an oxygen-containing heterocyclic organic compound containing a substituent as ligand; the ligand is a compound having a structure shown in formula (I).