Mixed Methane Ethane Conversion via Selective Catalysis
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Solution Overview
Problem
The separation of methane and ethane in gas streams is cumbersome, especially when the ethane content is low, requiring cryogenic distillation and resulting in high energy demand and capital expenditure, and existing processes do not efficiently convert these streams into useful chemical products without prior physical separation.
Innovation Solution
Converting ethane from a stream comprising methane and ethane to a product with a vapor pressure below 1 atmosphere, allowing for subsequent separation and chemical conversion of methane, which can then be used as an energy source or converted into useful chemical products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cryogenic distillation is used to separate methane and ethane, then separation efficiency is improved, but energy demand and capital expenditure increase significantly
Solution Approach 1:
The invention changes the physical state parameters by converting ethane to a liquid product at near-ambient conditions, eliminating the need for cryogenic temperatures. This parameter change from gas-phase separation to liquid-product formation resolves the contradiction by achieving separation without high energy input
Solution Approach 2:
The invention replaces the mechanical cryogenic distillation system with a chemical conversion system using catalysts. Instead of using mechanical refrigeration and distillation columns, the process uses catalytic reactions to selectively convert ethane to liquid products, thereby eliminating the energy-intensive mechanical separation equipment
2Manufacturing precision
If cryogenic distillation is used to separate methane and ethane, then separation efficiency is improved, but capital expenditure increases
Solution Approach 1:
The invention replaces complex mechanical separation equipment (distillation columns, refrigeration systems) with simpler catalytic reactors. This substitution reduces device complexity and capital expenditure while maintaining separation efficiency through selective chemical conversion
Solution Approach 2:
By changing the operating parameters from cryogenic temperatures to near-ambient conditions, the invention eliminates the need for expensive cryogenic equipment and complex distillation infrastructure, thereby reducing capital expenditure
3Manufacturing precision
If physical separation is performed before chemical conversion, then conversion selectivity is improved, but process complexity increases
Solution Approach 1:
The invention merges the separation function and chemical conversion function into a single integrated process. The catalyst performs both the separation of ethane from methane and the simultaneous conversion of ethane to liquid products, eliminating the need for separate separation and conversion units
Solution Approach 2:
The catalyst system performs multiple functions: it selectively adsorbs ethane, converts it to liquid products, and allows methane to pass through unchanged. This multi-functionality resolves the contradiction by achieving both separation and conversion in one step
4Manufacturing precision
If ethane is converted to a product with vapor pressure below 1 atmosphere, then separation from methane is improved, but conversion conditions become more restrictive
Solution Approach 1:
The invention changes the vapor pressure parameter of the ethane conversion product to be below 1 atmosphere, which enables spontaneous condensation and separation from gaseous methane. This parameter change improves separation efficiency while the use of catalysts maintains conversion versatility under mild conditions
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 process simplifies the separation of methane and reduces energy and capital costs by achieving high ethane conversion with minimal methane conversion, enabling the production of valuable chemicals like ethylene oxide and polyethylene without the need for prior physical separation.
Implementation Method 1
contacting the natural gas stream with a catalyst under conditions that selectively convert the natural gas component into at least one product
Implementation Method 2
converting ethane from a stream comprising methane and ethane to a product having a vapor pressure at 0° C. lower than 1 atmosphere
Data Source
AI summary
The invention relates to a process for conversion of a stream comprising methane and ethane, comprising converting ethane from a stream comprising methane and ethane, in which stream the volume ratio of methane to ethane is of from 0.005:1 to 100:1, to a product having a vapor pressure at 0° C. lower than 1 atmosphere, resulting in a stream comprising methane and the product having a vapor pressure at 0° C. lower than 1 atmosphere; separating the product having a vapor pressure at 0° C. lower than 1 atmosphere from the stream comprising methane and the product having a vapor pressure at 0° C. lower than 1 atmosphere, resulting in a stream comprising methane; and chemically converting methane from the stream comprising methane, or feeding methane from the stream comprising methane to a network that provides methane as energy source, or liquefying methane from the stream comprising methane.