Carbon-Based Catalyst for H2S and CO2 Conversion to Methane
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Solution Overview
Problem
Conventional methods for removing acid gases like H2S and CO2 from hydrocarbon streams are energy-intensive and result in environmental concerns due to CO2 release into the atmosphere.
Innovation Solution
A system and method for producing methane and sulfur by reacting a gas mixture of CO2 and H2S using a carbon-based catalyst, which can be integrated with a Claus Unit to reduce carbon footprint and improve energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If amine-based scrubbing process combined with Claus Unit is used to remove H2S and CO2, then acid gas removal efficiency is improved, but energy consumption increases due to high-temperature operational conditions
Solution Approach 1:
The patent changes the operational temperature parameter from high-temperature (1000°C thermal oxidation, 200-300°C catalytic oxidation) to mild conditions (ambient or slightly elevated temperature), fundamentally altering the energy consumption profile while maintaining acid gas removal efficiency through the H2S+CO2→CH4+S reaction mechanism
Solution Approach 2:
The patent converts the previously harmful CO2 emission into a useful resource by utilizing it as a reactant in the H2S+CO2→CH4+S reaction, thereby eliminating the need for separate CO2 separation and reducing overall energy consumption while producing valuable methane product
2Device complexity
If CO2 is co-fed into Claus Unit with H2S without separation, then process simplicity is maintained, but environmental harm increases due to CO2 release into atmosphere
Solution Approach 1:
The patent transforms CO2 from a harmful atmospheric emission into a valuable reactant that participates in the H2S+CO2→CH4+S reaction, thereby eliminating the need for separate CO2 separation while converting the harmful gas into useful methane product and solid sulfur
Solution Approach 2:
The patent creates a multi-functional process where the same reaction system simultaneously achieves H2S removal, CO2 utilization, methane production, and sulfur production, eliminating the need for separate CO2 separation units while addressing multiple objectives
3Reliability
If H2S is converted to water in conventional process, then sulfur recovery is achieved, but value loss occurs because H is more valuable as hydrogen and methane
Solution Approach 1:
The patent converts H2S from a harmful acid gas into valuable products (methane and solid sulfur) through the H2S+CO2→CH4+S reaction, thereby recovering both sulfur and hydrogen value in the form of methane instead of losing it as water
Solution Approach 2:
The patent changes the reaction pathway parameter from oxidation-based (H2S→H2O) to reduction-based (H2S+CO2→CH4+S), fundamentally altering the product distribution to favor valuable methane and sulfur over water, thereby preventing value loss
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 proposed H2S—CO2 reaction process reduces energy consumption and carbon emissions by operating at milder conditions, recycling CO2, and providing an additional source of methane while producing solid sulfur.
Implementation Method 1
reacting the carbon dioxide and the hydrogen sulfide from the reactant gas stream in a catalytic reactor using a carbon-based catalyst
Data Source
AI summary
Systems and methods for producing methane and sulfur. A first system includes a condensate separation system to separate a feed stream of mixed hydrocarbons, an acid gas removal system to produce a methane product stream and a reactant gas stream of carbon dioxide and hydrogen sulfide and a catalytic reactor configured to react the carbon dioxide and the hydrogen sulfide from the reactant gas stream using a carbon-based catalyst and produce an effluent methane stream, an effluent sulfur stream, and a waste stream. Another system for producing methane and sulfur includes a first separation system to separate water vapor and oxygen to produce a hydrogen sulfide stream, a catalytic reactor configured to react a separated carbon dioxide stream and the hydrogen sulfide stream using a carbon-based catalyst and produce a methane stream and a sulfur stream.