Methane OCM to Ethylene and Liquids With Lower Energy Use
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The petrochemical industry faces inefficiencies in producing higher molecular weight hydrocarbons from methane, as existing methods are energy-intensive and limited by the use of crude oil-derived ethane, and there is a need for more efficient conversion processes to meet increasing demand for ethylene and its derivatives.
Innovation Solution
An oxidative coupling of methane (OCM) system that converts methane to ethylene and further processes ethylene into higher molecular weight hydrocarbons, including gasoline, diesel fuel, and aromatic chemicals, using an OCM subsystem, separations subsystem, and olefin-to-liquids subsystem, with optional methanation and ethylene-to-liquids (ETL) subsystems, to enhance conversion efficiency and product diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If cracking and fractionation technology is used to produce hydrocarbons from crude oil, then various desirable compounds can be produced, but energy consumption increases and greenhouse gas emissions are generated
Solution Approach 1:
The patent changes the chemical parameters of the feedstock from crude oil to methane, and alters the reaction conditions to use oxygen instead of traditional cracking methods. This transforms the oxidation state and molecular structure directly, achieving hydrocarbon production with lower energy input and different emission profiles compared to conventional cracking and fractionation processes
Solution Approach 2:
The patent extracts and utilizes methane from natural gas as a separate feedstock source, bypassing the need to process crude oil through cracking and fractionation. By taking out methane as the primary feedstock and applying oxidative coupling, the process eliminates the energy-intensive intermediate steps of traditional petroleum refining while still producing desired hydrocarbon compounds
2Quantity of substance
If ethylene is produced from ethane in natural gas or crude oil, then ethylene can be produced, but the feedstock is limited and more expensive compared to methane
Solution Approach 1:
The patent makes the OCM process universally applicable to methane feedstock, which is far more abundant than ethane. The oxidative coupling mechanism can convert methane to ethylene and other C2+ hydrocarbons, providing a universal solution that works with the most abundant natural gas resource rather than being limited to specific ethane-containing feedstocks
Solution Approach 2:
The patent changes the feedstock parameter from ethane to methane, altering the carbon source to the most abundant and least expensive hydrocarbon. By adjusting reaction conditions (temperature, pressure, catalyst, oxygen concentration) to optimize methane conversion, the process achieves ethylene production from the most versatile and available feedstock
3Adaptability or versatility
If OCM process is used to convert methane to C2+ compounds, then ethylene can be produced from abundant methane, but the process requires optimization for selectivity and efficiency
Solution Approach 1:
The patent implements feedback control through catalyst design and reaction condition optimization. By selecting specific catalysts (such as perovskite structures, spinel oxides, or layered double hydroxides) and adjusting operating parameters based on product distribution analysis, the process achieves high selectivity for ethylene and desired C2+ compounds while minimizing unwanted byproducts
Solution Approach 2:
The patent applies local quality by using structured catalysts with specific active sites and pore structures tailored for methane activation and ethylene formation. The catalyst design creates localized reaction environments that favor desired product formation, with different zones or surfaces optimized for specific reaction steps in the oxidative coupling mechanism
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
The OCM system achieves efficient conversion of methane to higher molecular weight hydrocarbons with improved selectivity and yield, reducing energy consumption and environmental impact, while providing a viable alternative to crude oil-based ethylene production, thus addressing the industry's efficiency and sustainability challenges.
Implementation Method 1
An oxidative coupling of methane (OCM) reaction is a process by which methane can form one or more hydrocarbon compounds with two or more carbon atoms
Implementation Method 2
the first heat exchanger cools the product stream
Implementation Method 3
the de-methanizer unit accepts the product stream from the first heat exchanger and generates an overhead stream comprising at least a portion of the non-C2+ impurities
Implementation Method 4
at least a portion of the overhead stream is cooled in the second heat exchanger
Implementation Method 5
Oligomerization processes can be used to further convert ethylene into longer chain hydrocarbons useful for polymer components for plastics, vinyls, and other high value polymeric products
Data Source
AI summary
Integrated systems are provided for the production of higher hydrocarbon compositions, for example liquid hydrocarbon compositions, from methane using an oxidative coupling of methane system to convert methane to ethylene, followed by conversion of ethylene to selectable higher hydrocarbon products. Integrated systems and processes are provided that process methane through to these higher hydrocarbon products.