Acetone Pre-Oxidation and Hydrogenation for Electronic-Grade Isopropanol
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Solution Overview
Problem
Existing methods for producing isopropanol fail to effectively remove organic reducing impurities, anions, cations, and particles, failing to meet the stringent purity requirements of high-end wafer manufacturing with line widths ≤ 90nm.
Innovation Solution
A process involving acetone pre-oxidation to convert reducing impurities, followed by hydrogenation and subsequent dehydration and refining steps, using a system comprising an acetone pre-oxidation processor, hydrogenation reactor, and purification units to produce electronic-grade isopropanol with impurity levels below 5 ppm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If variable pressure adsorption separation process is used, then the production system becomes more complex, but the trace organic impurities are not effectively removed
Solution Approach 1:
The patent applies preliminary action by performing pre-oxidation treatment on acetone raw material before hydrogenation. This converts trace organic reducing impurities into non-reducing impurities that can be more easily removed during subsequent purification steps, thereby achieving effective impurity removal without requiring complex variable pressure adsorption systems.
Solution Approach 2:
The patent replaces the mechanical/physical variable pressure adsorption separation system with a chemical pre-oxidation treatment approach. By using oxidation chemistry to transform the nature of impurities before hydrogenation, the method achieves better purification results with a simpler process system.
2Manufacturing precision
If multiple purification steps including molecular sieve dehydration, resin dehydration, reverse osmosis, high-temperature distillation, ion exchange, and cyclic adsorption-filtration are used, then the purification process becomes more complex, but trace organic impurities are still not effectively removed
Solution Approach 1:
The patent performs pre-oxidation of acetone raw material before hydrogenation to convert trace organic reducing impurities into compounds that are easier to remove. This preliminary chemical treatment simplifies subsequent purification steps and achieves effective removal of trace organic impurities without requiring multiple complex purification units.
Solution Approach 2:
The patent changes the chemical state of impurities through oxidation, transforming reducing impurities into non-reducing impurities. This parameter change in the chemical nature of impurities makes them more amenable to removal through simpler subsequent purification steps, achieving high purity without excessive process complexity.
3Manufacturing precision
If pre-oxidation treatment is added to the process, then the process complexity increases, but the organic impurities content in the product can be reduced to below 5ppm
Solution Approach 1:
The patent adds pre-oxidation treatment as a preliminary step before hydrogenation. This converts trace organic reducing impurities in acetone into non-reducing impurities, which are then more effectively removed during subsequent purification steps, achieving organic impurity content below 5ppm with a manageable process complexity.
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 impurity levels meeting high-end wafer manufacturing standards, utilizing readily available acetone and maintaining low energy consumption by pre-oxidizing impurities in the acetone purification stage, thereby simplifying the overall process.
Implementation Method 1
introducing the acetone raw material into an acetone pre-oxidation processor to pre-oxidize the reducing impurities to obtain a pre-oxidized acetone raw material
Implementation Method 2
introducing an acetone feed into an acetone hydrogenation reactor for hydrogenation reaction to obtain a crude isopropanol product
Data Source
Figure 1
AI summary
The present invention provides a process for preparing isopropanol by hydrogenating acetone, characterized in that the process comprises: (1) introducing an acetone raw material into an acetone pre-oxidation processor to preoxidize impurities to obtain a pre-oxidized acetone raw material; and (2) introducing the acetone raw material after the pre-oxidation treatment and an optional intermediate treatment into an acetone hydrogenation reactor to conduct a hydrogenation reaction to obtain a crude isopropanol product.