Oxidative Coupling of Methane Reactor with Ethane Recycling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current oxidative coupling of methane (OCM) processes face limitations in achieving high selectivity and conversion of methane to C2+ compounds, often requiring extreme temperatures and resulting in low carbon efficiency and high energy consumption.
Innovation Solution
The method involves injecting oxygen and methane into an OCM reactor with a catalyst, maintaining a specific concentration of ethane, and recycling ethane to optimize the reaction conditions, allowing for the conversion of methane to C2+ compounds while utilizing the reaction heat for additional ethane cracking and hydrogen production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If extreme temperatures are used to achieve high methane conversion, then conversion rate improves, but energy consumption increases and carbon efficiency decreases
Solution Approach 1:
The patent changes the temperature parameter from extreme high temperatures to moderate temperatures (700-900°C), and combines it with specific catalyst composition parameters (Li, Na, K, Ca, Sr, Ba combinations with Al2O3, SiO2, or TiO2 supports) to achieve high conversion rates without excessive energy consumption. This resolves the contradiction by finding an optimal parameter combination that maintains productivity while reducing energy use.
Solution Approach 2:
The patent employs composite catalyst materials combining multiple alkali/alkaline earth metals (Li, Na, K, Ca, Sr, Ba) with oxide supports (Al2O3, SiO2, TiO2). These composite materials provide synergistic effects that enable high methane conversion at moderate temperatures, thus improving conversion rate while avoiding the high energy consumption associated with extreme temperature processes.
2Productivity
If extreme temperatures are used to achieve high methane conversion, then conversion rate improves, but carbon efficiency decreases
Solution Approach 1:
The patent optimizes temperature parameters to a moderate range (700-900°C) and combines them with specific catalyst composition parameters (multiple metal combinations with oxide supports) to achieve high conversion rates while minimizing unwanted side reactions. This parameter optimization ensures that more carbon from methane is converted to desired C2+ hydrocarbons rather than being lost as CO or CO2, thus improving carbon efficiency while maintaining high productivity.
Solution Approach 2:
The composite catalyst materials with specific metal combinations and oxide supports promote selective reactions that convert methane to C2+ hydrocarbons with high carbon efficiency. The composite structure provides multiple active sites that facilitate the coupling reaction while suppressing complete oxidation, thereby improving both conversion rate and carbon efficiency simultaneously.
3Productivity
If ethane concentration is increased to improve C2+ compound yield, then product yield improves, but reaction control becomes more difficult
Solution Approach 1:
The patent implements feedback control by continuously monitoring ethane concentration in the reactor and adjusting the methane feed rate or other operating parameters accordingly. This closed-loop control system maintains ethane concentration within the optimal range (at least 3 mol%), ensuring high C2+ compound yield while preventing runaway reactions or loss of control, thus resolving the contradiction between product yield and ease of operation.
Solution Approach 2:
The patent optimizes the ethane concentration parameter to a specific range (at least 3 mol%) and combines it with optimized catalyst composition parameters. This parameter optimization creates a reaction environment where high ethane concentration promotes C2+ compound formation while the catalyst properties ensure the reaction remains controllable, thus achieving both high yield and ease of operation.
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 enhances carbon efficiency, reduces energy consumption, and increases the yield of C2+ compounds, such as ethylene, while maintaining operational feasibility at lower temperatures, thereby improving the overall process efficiency.
Implementation Method 1
the OCM reactor comprises an OCM catalyst for facilitating an OCM reaction
Implementation Method 2
performing an OCM reaction to convert the CH4 into C2+ compounds
Data Source
AI summary
The present disclosure provides natural gas and petrochemical processing systems including oxidative coupling of methane reactor systems that integrate process inputs and outputs to cooperatively utilize different inputs and outputs of the various systems in the production of higher hydrocarbons from natural gas and other hydrocarbon feedstocks.