Reactors and systems for oxidative coupling of methane
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The petrochemical industry faces challenges in efficiently converting methane into higher chain hydrocarbons, such as ethylene and other C2+ compounds, due to limitations in existing oxidative coupling of methane (OCM) processes, which often require high temperatures and result in low selectivity and conversion rates.
Innovation Solution
The implementation of a process involving oxidative coupling of methane (OCM) with a recycle loop that includes hydrogenation and methanation stages, where methane is oxidized to form C2+ compounds, and the recycle stream is processed to enhance efficiency and selectivity, allowing for the production of ethylene and other hydrocarbons through a series of reactors and separation technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If oxidative coupling of methane is performed at high temperatures to increase reaction rate, then productivity improves, but energy consumption increases and selectivity decreases
Solution Approach 1:
The patent applies preliminary action by pre-heating the reactant gases (methane and oxygen/air) to the required reaction temperature (700-900°C) using heat exchangers before they enter the reactor. This allows the reaction to proceed at high temperature for improved productivity while the energy is efficiently transferred from the exothermic reaction zone to the incoming feed, reducing overall energy consumption.
Solution Approach 2:
The patent implements continuity of useful action through the recycle loop where unreacted methane and oxygen are continuously recycled back to the reactor inlet. This maintains continuous reaction conditions, ensures complete utilization of the exothermic heat generation, and sustains high conversion rates without requiring excessive energy input for intermittent batch heating.
2Productivity
If oxidative coupling of methane is performed at high temperatures to increase conversion, then productivity improves, but selectivity to C2+ compounds decreases
Solution Approach 1:
The patent applies parameter changes by carefully controlling the oxygen to methane ratio (0.2-0.8:1) and maintaining specific temperature ranges (700-900°C) in the reactor. These optimized parameters enable high conversion rates while favoring the formation of C2+ compounds over complete combustion products, thus improving selectivity alongside productivity.
Solution Approach 2:
The patent implements feedback through the recycle loop that continuously monitors and returns unreacted methane and oxygen to the reactor inlet. This feedback mechanism maintains optimal reactant concentrations and temperature profiles, ensuring high selectivity to C2+ compounds while achieving high overall conversion through multiple passes.
3Adaptability or versatility
If a recycle loop is implemented to improve efficiency and reduce waste, then resource utilization improves, but device complexity increases
Solution Approach 1:
The patent applies merging by combining the reactor, heat exchangers, and recycle loop into an integrated system where unreacted gases are continuously recirculated. This unified approach improves resource utilization by ensuring complete consumption of reactants while the modular design of combining these components keeps the overall system manageable and not excessively complex.
4Manufacturing precision
If separation technologies are used to recover C2+ compounds from the reaction effluent, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the separation process into distinct stages: initial cooling and condensation of heavy hydrocarbons, followed by distillation columns for separating C2+ compounds from unreacted methane and oxygen. This segmented approach achieves high product purity while keeping each separation unit relatively simple and manageable.
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 increases the efficiency and selectivity of methane conversion to C2+ compounds, reducing energy consumption and increasing the yield of valuable hydrocarbons like ethylene, while also recycling and reusing process streams to minimize waste and optimize resource utilization.
Implementation Method 1
converting at least a feed stream comprising methane (CH4) and oxygen (O2) feed into a conversion effluent by oxidative coupling of methane (OCM)
Implementation Method 2
a recycle loop comprising a hydrogenation stage and a methanation stage
Implementation Method 3
a recycle loop comprising a hydrogenation stage and a methanation stage
Data Source
AI summary
In an aspect, the present disclosure provides a method for the oxidative coupling of methane to generate hydrocarbon compounds containing at least two carbon atoms (C2+ compounds). The method can include mixing a first gas stream comprising methane with a second gas stream comprising oxygen to form a third gas stream comprising methane and oxygen and performing an oxidative coupling of methane (OCM) reaction using the third gas stream to produce a product stream comprising one or more C2+ compounds.