Supersonic Methane Pyrolysis Reactor for Acetylene Production
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Solution Overview
Problem
Traditional pyrolysis processes are inefficient and costly for converting methane into valuable hydrocarbons like ethylene, and existing methods face challenges with product purity and contaminant effects in commercial-scale applications.
Innovation Solution
A supersonic flow reactor is used to pyrolyze methane, converting it to acetylene, which is then processed through hydrogenation and oligomerization to produce higher-value oxygenates such as aldehydes, alcohols, and ethers, with contaminant removal steps to enhance product purity and reactor efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional pyrolysis processes are used to convert methane to hydrocarbons, then the conversion can be achieved, but the process is inefficient and costly with lower yields
Solution Approach 1:
The patent applies parameter changes by utilizing supersonic flow conditions (Mach number > 1) to achieve extremely high temperatures (2000-4000 K) and short residence times (milliseconds). This fundamental change in process parameters enables direct methane pyrolysis with acetylene yields exceeding 50%, dramatically improving productivity while reducing energy consumption compared to traditional steam cracking or catalytic processes
2Manufacturing precision
If traditional pyrolysis processes are used, then conversion can occur, but product purity is compromised due to contaminant effects
Solution Approach 1:
The patent applies the extraction principle by removing contaminants (such as sulfur compounds, moisture, and particulates) from the methane feedstream before introducing it to the supersonic reactor. This preprocessing step prevents contaminant-related deactivation of downstream catalysts and minimizes harmful effects on product purity, enabling efficient conversion to high-purity oxygenates
Solution Approach 2:
The patent uses an intermediary approach by implementing a multi-stage process where methane is first converted to acetylene in the supersonic reactor, then subsequently converted to oxygenates in a separate catalytic reactor. This intermediate step isolates the high-temperature pyrolysis zone from the catalyst-sensitive oxidation zone, protecting catalysts from thermal degradation and contaminant poisoning
3Quantity of substance
If methane is converted to acetylene and then to oxygenates, then valuable chemicals are produced, but the process complexity increases
Solution Approach 1:
The patent merges two distinct chemical transformation processes (supersonic pyrolysis and catalytic oxidation) into an integrated flow system. The supersonic reactor effluent is directly fed to the catalytic converter, eliminating intermediate separation and purification steps. This merging approach maintains high oxygenate production while reducing overall process complexity compared to batch processes or systems requiring multiple separation units
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 achieves higher yields of acetylene and other hydrocarbons compared to traditional methods, with improved product purity and reduced contaminant impact, facilitating more efficient and cost-effective production of valuable chemicals from methane.
Implementation Method 1
converting methane to acetylene using a supersonic flow reactor
Implementation Method 2
The acetylene is passed to a hydrogenation reactor to convert the acetylene to olefins
Implementation Method 3
the olefins are passed to an aldehyde conversion reactor to generate an effluent stream comprising aldehydes
Data Source
AI summary
Methods and systems are provided for converting methane in a feed stream to acetylene. The method includes processing acetylene as an intermediate stream to form a stream having oxygenates. The hydrocarbon stream is introduced into a supersonic reactor and pyrolyzed to convert at least a portion of the methane to acetylene. The reactor effluent stream may be treated to convert acetylene to oxygenates through subsequent reactors.