Ferric MGDA Sequestration of Hydrogen Sulfide in Aerobic Gas Streams
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Solution Overview
Problem
Hydrogen sulfide (H2S) poses significant challenges in wastewater treatment and natural gas industries due to its corrosive nature, toxicity, and association with odor production, corrosion of equipment, and health hazards, necessitating effective and cost-efficient removal methods.
Innovation Solution
The use of Ferric MGDA (Methyglycinediacetate) in aerobic environments to sequester hydrogen sulfide, forming a ferrous sulfide compound that reacts with oxygen to break the iron-sulfide bond, releasing elemental sulfur and reactivating Ferric MGDA for continuous sulfide removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional hydrogen sulfide removal methods are used, then hydrogen sulfide can be removed from gas streams and wastewater, but the treatment process becomes complex and costly with additional equipment requirements
Solution Approach 1:
The patent extracts the harmful hydrogen sulfide from gas streams and wastewater using a simple liquid absorbent containing iron salts and chelating agents. The treatment reduces to a basic absorption process where H2S contacts the liquid solution, forming iron sulfide precipitates that can be easily removed. This eliminates the need for complex mechanical separation equipment while achieving effective hydrogen sulfide removal.
Solution Approach 2:
The patent changes the chemical parameters of the treatment system by using iron salts in combination with chelating agents (such as EDTA, NTA, or citrate) to create a highly effective absorbent solution. The chelating agents modify the iron salt solubility and reactivity parameters, enabling the system to maintain iron in solution at controlled levels while maximizing hydrogen sulfide absorption capacity and preventing premature precipitation.
2Object-affected harmful factors
If conventional hydrogen sulfide removal methods are used, then hydrogen sulfide can be removed from gas streams and wastewater, but treatment costs increase due to additional chemicals and equipment
Solution Approach 1:
The patent creates a multi-functional treatment solution where iron salts serve multiple purposes: they act as the primary hydrogen sulfide absorbing agent, provide precipitate formation for easy solid-liquid separation, and when combined with chelating agents, maintain solution stability and prevent unwanted side reactions. This universal approach eliminates the need for multiple separate treatment chemicals and equipment systems, reducing overall treatment costs while maintaining high removal efficiency.
Solution Approach 2:
The patent employs inexpensive iron salts (such as ferrous sulfate or ferric chloride) as the core absorbent material, which are among the cheapest chemical reagents available. The treatment system is designed to be simple and disposable in nature, where the liquid absorbent can be easily prepared from common chemicals and discarded or regenerated after use, avoiding investment in expensive, complex equipment that would require maintenance and replacement.
3Object-generated harmful factors
If hydrogen sulfide is not removed, then equipment corrosion and odor problems occur, but removal methods add complexity to the treatment process
Solution Approach 1:
The patent converts the harmful hydrogen sulfide gas into a beneficial solid precipitate (iron sulfide) through a simple chemical reaction. The hydrogen sulfide that causes corrosion and odor problems is transformed into an insoluble solid that can be easily separated from the liquid phase by sedimentation or filtration. This conversion approach eliminates the need for complex gas handling or odor control equipment while effectively preventing corrosion and odor issues.
Solution Approach 2:
The patent introduces chelating agents as intermediary substances that mediate between the iron salts and hydrogen sulfide. These intermediaries (chelating agents) control the iron salt solubility and reactivity, ensuring optimal hydrogen sulfide absorption while preventing premature iron precipitation. The chelating agents act as mediators that facilitate the main treatment reaction while maintaining system stability, simplifying the overall process by eliminating the need for multiple separate control mechanisms.
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 achieves high efficiency in removing hydrogen sulfide from gas streams and wastewater, reducing corrosion risks and odor issues, with potential for cost-effective and environmentally responsible treatment.
Implementation Method 1
The use of Ferric MGDA (Methyglycinediacetate) in aerobic environments to sequester hydrogen sulfide
Implementation Method 2
forming a ferrous sulfide compound that reacts with oxygen to break the iron-sulfide bond, releasing elemental sulfur
Data Source
AI summary
Certain exemplary embodiments can provide a system, machine, device, manufacture, and/or composition of matter adapted for and/or resulting from, and/or a method for, activities that can comprise and/or relate to contacting an aerobic contaminated gas stream with a solution comprising approximately Ferric MGDA, the aerobic contaminated gas stream comprising hydrogen sulfide.