Plasma Reactor Conversion to Acetylene or Ethylene with Millisecond Quenching
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Solution Overview
Problem
Existing methods struggle to directly convert methane into acetylene or ethylene due to the challenges of achieving the appropriate temperature conditions and reaction times, particularly in plasma pyrolysis processes, which often result in inefficient yields and the production of solid carbon.
Innovation Solution
A method and apparatus that involves supplying a hydrocarbon-based material to a plasma reactor, controlling the temperature to 1,000 to 2,500°C for a reaction time of 20 ms or less, using alternating current power to stabilize the plasma arc, and quenching the reaction to prevent further decomposition, combined with a catalyst for ethylene yield enhancement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If plasma pyrolysis process is used to convert methane into acetylene or ethylene, then the conversion can be achieved, but the temperature becomes excessively high causing the reaction time to be too long and solid carbon to form
Solution Approach 1:
The patent applies parameter changes by precisely controlling the residence time of the hydrocarbon-based material in the high-temperature zone to 20 milliseconds or less. This time parameter control allows the material to undergo partial decomposition at high temperatures (1,000-2,500°C) without proceeding to complete decomposition that would produce solid carbon, thus resolving the contradiction between achieving conversion and preventing excessive temperature effects
Solution Approach 2:
The patent implements the skipping principle by rapidly passing the material through the high-temperature zone in 20 ms or less, effectively 'rushing through' the critical temperature window. This rapid passage allows the material to undergo necessary decomposition reactions while avoiding prolonged exposure that would lead to over-decomposition and solid carbon formation
2Productivity
If plasma pyrolysis process is used to convert methane into acetylene or ethylene, then the conversion can be achieved, but solid carbon is produced as a harmful byproduct
Solution Approach 1:
The patent controls the residence time parameter to 20 milliseconds or less, which changes the reaction pathway by limiting the duration of high-temperature exposure. This parameter control ensures that decomposition stops at the acetylene/ethylene stage rather than proceeding to solid carbon formation, thus maintaining high conversion efficiency while preventing harmful byproduct formation
Solution Approach 2:
The patent implements feedback control by using a quenching mechanism that rapidly cools the material after it passes through the high-temperature zone. This feedback action (quenching) stops the decomposition reaction at the desired stage, preventing further decomposition that would produce solid carbon, thereby maintaining productivity while eliminating harmful byproducts
3Productivity
If indirect process is used to obtain ethylene from methane, then ethylene can be produced, but the process complexity increases with multiple steps
Solution Approach 1:
The patent merges multiple process steps into a single integrated plasma reactor system. By combining the decomposition and quenching operations in one device with a residence time of 20 ms or less, it achieves direct conversion from methane to acetylene/ethylene, eliminating the need for separate reforming and synthesis steps required in indirect processes, thus reducing process complexity while maintaining productivity
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 enables efficient conversion of hydrocarbons like methane into acetylene or ethylene by maintaining optimal temperature and reaction conditions, reducing the formation of solid carbon, and enhancing ethylene yield through catalytic hydrogenation.
Implementation Method 1
a plasma reactor, creating a temperature condition of a decomposition reaction of converting the hydrocarbon-based material into acetylene or ethylene in a reaction space in the plasma reactor
Implementation Method 2
converting a gaseous or liquid hydrocarbon-based material containing various types of hydrocarbon materials such as methane directly into acetylene or ethylene
Implementation Method 3
a quenching step of inducing a decrease in temperature of the reaction space to maintain the temperature condition for an effective reaction time
Data Source
AI summary
A method of converting a hydrocarbon-based material into acetylene or ethylene according to an embodiment of the present invention includes a supply step of supplying a gaseous or liquid hydrocarbon-based material to a plasma reactor, and a temperature control step of creating a temperature condition of a decomposition reaction of converting the hydrocarbon-based material into acetylene or ethylene in a reaction space in the plasma reactor.