Oxidizing Composition for H2S Removal and Pipeline Protection
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Solution Overview
Problem
Current methods for removing hydrogen sulfide (H2S) from sour gas and other hydrocarbon fuels are inefficient, costly, and do not effectively address corrosion and scaling issues in pipelines.
Innovation Solution
Activated oxidizing compositions comprising sodium hypochlorite, a chelating agent like etidronic acid, and transition metal compounds are used to oxidize H2S to elemental sulfur, providing anti-corrosion and anti-scaling protection by forming a protective layer on pipeline metals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional H2S removal methods (Claus process, liquid redox processes) are used, then H2S can be removed from sour gas, but the processes are complex, costly, and do not effectively address corrosion and scaling issues
Solution Approach 1:
The patent uses sodium hypochlorite, a strong oxidizing agent, to directly oxidize H2S to elemental sulfur through the reaction H2S + 4NaOCl → S + 4NaCl + 2H2O. This simplified chemical approach replaces complex industrial processes like the Claus process with a more straightforward oxidation method that can be implemented in simpler systems while effectively removing H2S from sour gas streams.
2Loss of substance
If traditional H2S removal methods are used, then sulfur can be recovered, but corrosion and scaling of pipelines are not effectively addressed
Solution Approach 1:
The oxidizing composition performs multiple functions simultaneously: it removes H2S through oxidation, prevents corrosion of pipeline metals by forming protective layers, and prevents scaling by inhibiting mineral deposition. This multi-functional approach addresses sulfur recovery, corrosion protection, and scaling prevention in a single integrated solution rather than requiring separate systems for each function.
3Object-affected harmful factors
If more complex treatment processes are implemented to address corrosion and scaling, then infrastructure protection may improve, but process complexity and cost increase
Solution Approach 1:
The patent combines H2S removal, corrosion inhibition, and scaling prevention into a single oxidizing composition formulation. The composition contains sodium hypochlorite for oxidation, along with additives that provide corrosion and scaling protection, eliminating the need for separate treatment systems and reducing overall process complexity while maintaining comprehensive infrastructure protection.
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 compositions efficiently remove H2S, reduce corrosion, and prevent scaling, achieving significant H2S reduction in natural gas pipelines and other hydrocarbon systems while protecting infrastructure.
Implementation Method 1
The activated oxidizing compositions mainly differ in pH depending on use... oxidize H2S to elemental sulfur
Implementation Method 2
providing anti-corrosion and anti-scaling protection by forming a protective layer on pipeline metals
Implementation Method 3
a chelating agent like etidronic acid
Data Source
AI summary
An oxidizing composition for removing hydrogen sulfide (H2S) from a gaseous or liquid stream includes mixture products of water, sodium hypochlorite, a chelating agent, and a transition metal compound. The chelating agent can be etidronic acid; the transition metal compound can be an iron (III) compound, such as ferric sulfate. The oxidizing composition is formed by (i) combining water, chelating agent, and transition metal compound to form an activator composition and (ii) mixing the activator composition with a sodium hypochlorite solution to adjust the pH, such as for a particular use. Some embodiments include various apparatuses and methods for treating different treatment sites with the oxidizing compositions disclosed herein. Examples of suitable treatment sites include, without limitation, natural gas pipelines, bubble towers, oil wells, gas wells, sewer wet wells, air scrubbers, saltwater disposal pipelines, and saltwater disposal wells.