Photocatalytic Hydrocarbon Functionalization via Iodine-Chloride System
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Solution Overview
Problem
Current methods for converting alkanes from natural gas into higher value compounds, such as methanol and olefins, are energy-intensive and require high temperatures and pressures, making the infrastructure for processing and transportation of natural gas expensive and inefficient.
Innovation Solution
A method involving the use of an iodine-based compound and a chloride source to functionalize hydrocarbons, such as methane, ethane, and propane, at lower temperatures (100-250°C) and pressures (240-6900 kPa), resulting in the production of mono-functionalized esters with high selectivity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current methods (reforming and Fischer-Tropsch catalysis) are used to convert methane to methanol, then conversion is achieved, but energy consumption increases and infrastructure cost increases
Solution Approach 1:
The patent changes the reaction parameters by using a photocatalytic system that operates at ambient temperature and pressure instead of the high temperature and pressure required by conventional reforming and Fischer-Tropsch processes. This fundamentally alters the energy input requirements while maintaining conversion efficiency.
Solution Approach 2:
The patent replaces the thermal-mechanical system (high temperature heating and pressure equipment) with a photochemical system using light irradiation and photocatalysts. This substitution eliminates the need for expensive high-temperature and high-pressure infrastructure while achieving the same conversion function.
2Productivity
If high temperature cracking is used to form olefins, then olefin production is achieved, but infrastructure cost increases
Solution Approach 1:
The patent replaces the high-temperature thermal cracking system with a photocatalytic system that uses light energy to break C-H bonds and form olefins. This eliminates the need for complex high-temperature furnaces and pressure vessels, reducing infrastructure cost while maintaining production capability.
Solution Approach 2:
The patent fundamentally changes the operating parameters from high temperature (typically 800-900°C for cracking) to ambient temperature with light irradiation. This parameter change eliminates the need for expensive thermal infrastructure while achieving olefin formation through photochemical pathways.
3Productivity
If natural gas is transported and processed through existing infrastructure, then conversion to higher value compounds is achieved, but processing cost increases
Solution Approach 1:
The patent replaces the multi-step thermal processing infrastructure (reforming units, shift converters, Fischer-Tropsch reactors) with a direct photocatalytic conversion system. This substitution reduces processing costs by eliminating intermediate steps and expensive infrastructure while maintaining value addition from natural gas to higher value compounds.
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 allows for the efficient conversion of alkanes to mono-functionalized products with yields greater than 20% for methane and 30% for ethane, meeting established benchmarks for alkane functionalization, while the iodine byproduct can be thermally recycled, reducing costs and energy consumption.
Implementation Method 1
A method involving the use of an iodine-based compound and a chloride source to functionalize hydrocarbons... applying light from a light source to the second mixture to make a functionalized hydrocarbon
Data Source
AI summary
Embodiments of the present disclosure provide for methods of hydrocarbon functionalization, methods and systems for converting a hydrocarbon into a compound including at least one group ((e.g., hydroxyl group) (e.g., methane to methanol)), functionalized hydrocarbons, and the like. Systems and methods as described herein can utilize photocatalysis.