Oxidation of Cycloalkanes Using Ozone for Carboxylic Acid Synthesis
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Solution Overview
Problem
Current methods for producing adipic acid, terephthalic acid, and benzoic acid involve high temperature, high pressure, and corrosive chemicals, leading to energy inefficiency, environmental concerns, and high production costs, with existing alternatives being either economically infeasible or lacking industrial applicability.
Innovation Solution
A method using ozone, singlet state-oxygen atoms, or hydroxyl free radicals to oxidize cycloalkanes and benzenes at mild temperatures and pressures without transition metal catalysts or corrosive solvents, producing carboxylic acids and ketones efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high temperature and high pressure oxidation methods are used to produce carboxylic acids, then conversion and selectivity are improved, but energy consumption increases and environmental harm worsens due to N2O production
Solution Approach 1:
The patent employs ozone as a strong oxidant to replace conventional oxygen-based oxidation systems. Ozone's higher oxidation potential enables efficient oxidation of cyclohexane and other substrates under milder conditions, achieving good conversion and selectivity without requiring high temperature and pressure. This eliminates N2O formation and reduces energy consumption while maintaining product yield.
Solution Approach 2:
The invention changes the oxidation parameters by using ozone instead of molecular oxygen, and by conducting reactions at ambient or mild temperatures and pressures rather than high temperature and pressure. This parameter change enables the same oxidation transformations to proceed with high efficiency while avoiding the harmful effects of extreme conditions and N2O production.
2Productivity
If high temperature and high pressure oxidation is used, then production of carboxylic acids is achieved, but energy consumption increases and production cost increases
Solution Approach 1:
Ozone serves as a powerful oxidant that accelerates the oxidation of cyclohexane and other hydrocarbons to carboxylic acids. This accelerated oxidation occurs rapidly at ambient or mild conditions, eliminating the need for energy-intensive high temperature and pressure equipment, thereby reducing both energy consumption and capital costs while maintaining high productivity.
Solution Approach 2:
The invention replaces the mechanical/thermal system (high temperature and pressure equipment) with a chemical system based on ozone's inherent oxidation power. This substitution eliminates the need for expensive high-pressure reactors and associated safety systems, reducing both energy consumption and equipment costs while achieving the same production output.
3Manufacturing precision
If nitric acid oxidation is used to produce adipic acid, then conversion is improved, but equipment cost increases due to corrosive conditions requiring titanium vessels
Solution Approach 1:
Ozone replaces nitric acid as the oxidant, providing the necessary oxidation power without the severe corrosivity of concentrated nitric acid. This allows the use of standard stainless steel or glass reaction vessels instead of expensive titanium equipment, significantly reducing capital costs while maintaining good conversion rates.
Solution Approach 2:
The invention uses ozone, a short-lived gas that decomposes to oxygen, replacing persistent corrosive chemicals like nitric acid. This eliminates long-term corrosion damage to equipment, reducing maintenance costs and extending equipment life, while achieving comparable or better conversion efficiency.
4Productivity
If conventional oxidation methods are used, then production of carboxylic acids is achieved, but environmental harm worsens due to corrosive chemicals and toxic byproducts
Solution Approach 1:
The patent converts the potentially harmful ozone gas (which can be toxic at high concentrations) into a beneficial oxidant that decomposes harmlessly into oxygen. The reaction conditions are controlled to prevent ozone accumulation, and the byproducts are primarily water and oxygen instead of toxic substances, thus converting a potentially harmful reagent into an environmentally benign process.
Solution Approach 2:
The use of ozone as an oxidant creates a cleaner, less corrosive reaction environment compared to nitric acid or bromide-catalyzed systems. The reaction medium remains relatively inert and non-corrosive, eliminating the need for special corrosion-resistant materials and reducing environmental contamination from acidic waste streams.
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 method reduces energy consumption, avoids toxic byproducts, and lowers production costs, making it economically viable and environmentally friendly for large-scale industrial production of key chemicals like adipic acid and terephthalic acid.
Implementation Method 1
a method using ozone, singlet state-oxygen atoms, or hydroxyl free radicals to oxidize cycloalkanes and benzenes at mild temperatures and pressures
Implementation Method 2
singlet state-oxygen atom O(1D) produced by irradiation of ozone by a light beam having a wavelength between 230 nm and 330 nm
Implementation Method 3
hydroxyl free radical produced by photo-oxidation of water or an alcohol
Data Source
AI summary
A preparation method of carboxylic acids or ketones using ozone, singlet state oxygen atom O(1D) or hydroxyl free radical is provided. The method includes: filling ozone, singlet state oxygen atom O(1D) and/or hydroxyl free radical to cycloalkanes or benzenes at a pre-determined temperature and a pre-determined pressure in the presence or absence of light irradiation to produce carboxylic acids or ketones. The reaction occurs at room temperature and atmospheric pressure without producing harmful side products. The preparation method is a simple, low energy consuming, and eco-friendly method.