Electrochemical Hydrogen Sulfide Conversion to Sulfur and Hydrogen

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Solution Overview

Problem

Current methods for removing hydrogen sulfide from natural gas, such as the Claus process, are costly, require high operational expenses, and do not produce valuable by-products like hydrogen gas, while electrochemical processes using precious metal electrodes are prone to sulfur passivation.

Innovation Solution

A method involving an ionic-conductive liquid solution in an electrochemical cell with electrodes for hydrogen evolution and sulfur oxidation reactions, which forms hydrogen and sulfur without precious metals, using elements like alkali metals, alkaline earth metals, or group 12 elements, and optionally with dopants to prevent electrode passivation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the Claus process is used to remove hydrogen sulfide, then hydrogen sulfide can be converted to elemental sulfur, but the process requires high investment and operational costs, special chemicals and equipment, high pressures and temperatures, and produces waste products

Engineering Contradiction:

Improvehydrogen sulfide removal efficiencyVSAvoidprocess complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces the thermal-mechanical Claus process with an electrochemical system that uses electrical energy to drive hydrogen evolution and sulfur oxidation reactions at electrode surfaces, eliminating the need for high-temperature combustion, complex chemical reagents, and specialized equipment

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention changes the operating parameters from high temperature and pressure conditions to ambient or mild conditions, using electrochemical potential instead of thermal energy to drive the conversion of hydrogen sulfide to sulfur and hydrogen gas

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the Claus process is used to remove hydrogen sulfide, then hydrogen sulfide can be converted to elemental sulfur, but the process does not produce valuable by-products like hydrogen gas

Engineering Contradiction:

Improvehydrogen sulfide removal efficiencyVSAvoidvaluable by-product production

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent converts the harmful hydrogen sulfide into two valuable products: elemental sulfur (a commodity chemical) and hydrogen gas (a fuel and chemical feedstock), turning a waste removal problem into a value-creation opportunity by capturing both products rather than discarding them

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The electrochemical cell performs multiple functions simultaneously: it removes hydrogen sulfide from gas streams, produces elemental sulfur as a commodity, generates hydrogen gas as a fuel, and can be integrated into existing natural gas processing infrastructure without requiring separate treatment systems

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Productivity

If electrochemical processes use precious metal electrodes, then hydrogen evolution and sulfur oxidation reactions can occur, but the electrodes become deactivated due to sulfur passivation

Engineering Contradiction:

Improvereaction efficiencyVSAvoidelectrode stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent employs inexpensive alternative electrode materials such as carbon, transition metal oxides, and conductive polymers that can be easily replaced if needed, eliminating the need for expensive precious metals and reducing the economic impact of electrode deactivation from sulfur passivation

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The invention introduces mediators such as metal oxides, sulfide compounds, or conductive polymers that facilitate the transfer of hydrogen sulfide to the electrode surface and promote the electrochemical reactions without requiring direct contact between sulfur and the electrode material, thereby preventing passivation

Inventive Principle:

Principle #24Intermediary (Mediator)

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 method efficiently produces hydrogen and sulfur as valuable by-products with lower energy consumption and operational costs, resistant to electrode passivation, and suitable for a wide range of hydrogen sulfide concentrations.

Implementation Method 1

an electrode for hydrogen evolution reaction (HER)... forming the hydrogen

Methodology Applied

Scientific EffectHydrogen evolution reaction: Electrolysis

Implementation Method 2

an electrode for sulfur oxidation reaction (SOR)... forming the sulfur

Methodology Applied

Scientific EffectSulfur oxidation reaction: Oxidation

Implementation Method 3

contacting an ionic-conductive liquid solution including hydrogen sulfide with an electrode for H2 evolution reaction (HER) and an electrode for sulfur oxidation reaction (SOR) in an electrochemical cell

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Data Source

PatentUS20250313963A1Methods of forming sulfur and hydrogen from hydrogen sulfide

Publication Date: 2025.10.09 SAUDI ARABIAN OIL CO

AI summary

This disclosure relates to methods of forming elemental sulfur and hydrogen gas from hydrogen sulfide. The disclosed methods include contacting a solution including hydrogen sulfide with an electrode for hydrogen evolution and an electrode for sulfur oxidation.