Liquid Phase Ozonation of Alkanes with Activators
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Solution Overview
Problem
Current selective oxidation technologies of alkanes face low yields of liquid oxygenates due to high temperatures required, leading to combustion and over-oxidation issues, particularly with ozone utilization and decomposition.
Innovation Solution
The use of a branched alkane activator and a protic additive in a liquid phase medium during ozonation processes to tune product selectivity, limit over-oxidation to CO and CO2, and enhance ozone utilization, allowing for the oxidation of linear and cyclic alkanes at ambient temperatures and mild pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high temperatures (50-200° C.) are used to oxidize alkanes with O2, then oxidation reaction occurs, but substrate and products suffer combustion to form CO2
Solution Approach 1:
The patent changes the temperature parameter from high temperature (50-200° C.) to ambient temperature, and introduces ozone as the oxidant instead of O2. This parameter change enables oxidation to proceed at lower temperatures with selective formation of liquid oxygenates while minimizing CO2 combustion products.
Solution Approach 2:
The patent uses ozone (O3) as a strong oxidant instead of ordinary oxygen (O2). Ozone's stronger oxidizing capability allows the reaction to proceed at ambient temperatures, avoiding the high-temperature combustion that occurs with O2 oxidation, thus reducing CO2 formation while maintaining productivity.
2Productivity
If high temperatures (> 450° C.) are used for direct dehydrogenation of alkanes, then olefins are produced at low single-pass conversions, but the process requires even higher temperatures
Solution Approach 1:
The patent employs ozone as a strong oxidant that enables alkane activation and olefin formation at ambient temperatures, eliminating the need for high-temperature dehydrogenation processes. This maintains low single-pass conversions while avoiding excessive temperature requirements.
3Productivity
If ozone is used to oxidize hydrocarbons, then powerful oxidation occurs, but it is challenging to effectively utilize ozone towards particular reaction products and minimize over-oxidation to CO2
Solution Approach 1:
The patent introduces a catalyst system comprising a metal complex with a specific ligand environment as an intermediary. This catalyst mediates the ozone oxidation process, directing it towards formation of specific liquid oxygenate products while preventing uncontrolled over-oxidation to CO2, thus improving both productivity and selectivity.
Solution Approach 2:
The patent changes the reaction conditions by using ambient temperature and controlling ozone concentration, which prevents excessive oxidation. The catalyst system further controls the reaction pathway to ensure selective formation of desired products while minimizing CO2 formation.
4Productivity
If gas phase ozonation is used, then oxidation occurs, but the ability to add branched alkane activator and protic additive to control reaction pathways is limited
Solution Approach 1:
The patent changes the phase from gas phase to liquid phase, enabling the incorporation of branched alkane activators and protic additives as co-solvents. This phase change provides the versatility to control reaction pathways through additive selection, improving both productivity and adaptability.
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 significantly increases ozone utilization and selectivity towards liquid oxygenates, reducing CO2 formation and achieving high carbon atom economy, thereby improving the efficiency and sustainability of alkane oxidation processes.
Implementation Method 1
combining an alkyl substrate and ozone in a liquid phase medium comprising a branched alkane activator and a protic additive under conditions sufficient to oxidize the alkyl substrate to products
Implementation Method 2
the branched alkane activator can be used to tune product selectivity, limit overoxidation to CO and CO2, and increase ozone utilization
Implementation Method 3
a liquid phase medium comprising a branched alkane activator and a protic additive
Data Source
AI summary
A process for oxidizing an alkyl substrate may comprise combining an alkyl substrate (e.g., propane, n-butane) and ozone in a liquid phase medium comprising a branched alkane activator (e.g., isobutane) and a protic additive (e.g., water) under conditions sufficient to oxidize the alkyl substrate to products. The alkyl substrate may be selected from linear and cyclic alkanes.