Mercaptan Treatment for Elemental Sulfur Deposition
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Solution Overview
Problem
Current methods for removing sulfur compounds from hydrocarbon fluids, such as hydrodesulfurization and biodesulfurization, face challenges in reducing sulfur deposition on equipment, especially with increasing sulfur content in heavy and sour crudes, and existing technologies often fail to effectively prevent sulfur corrosion and deposition in hydrocarbon production systems.
Innovation Solution
The introduction of mercaptans into hydrocarbon fluids to convert elemental sulfur into disulfides and polysulfides, which can be dissolved and solvated, preventing deposition on equipment and allowing for removal through gas stripping or oil/water separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If hydrodesulfurization is used to remove sulfur compounds, then sulfur content is reduced, but sulfur deposition on equipment still occurs and corrosion damage continues
Solution Approach 1:
Amine compounds serve as intermediary substances that react with elemental sulfur to form amine-sulfur complexes. These complexes remain soluble in the hydrocarbon stream and prevent sulfur deposition on equipment surfaces. The amine acts as a mediator between the sulfur contaminant and the hydrocarbon fluid, transforming the harmful elemental sulfur into a benign soluble complex.
Solution Approach 2:
The invention changes the chemical state of sulfur from elemental (insoluble, corrosive) to a chemically modified state (soluble complex). By altering the chemical parameters through amine reaction, the sulfur remains in solution rather than precipitating as deposits, thus preventing corrosion while maintaining reduced sulfur content.
2Quantity of substance
If oxidative desulfurization is used to convert sulfur species, then sulfur is transformed to sulfones and sulfoxides, but the process requires oxygen-containing gas and oxidation catalysts increasing system complexity
Solution Approach 1:
The invention extracts the oxygen requirement from the desulfurization process by using amine compounds that contain nitrogen instead. The amine-sulfur reaction occurs without external oxygen supply, eliminating the need for oxygen-containing gas injection systems and oxidation catalysts, thereby simplifying the equipment while achieving sulfur species conversion.
Solution Approach 2:
The amine compounds serve as consumable reagents that react with sulfur and are subsequently removed in standard separation processes. This approach replaces expensive and complex oxidation catalysts with simpler, readily available amine compounds that can be easily introduced and removed from the system.
3Quantity of substance
If biodesulfurization enzymes are used to transform sulfur compounds, then organic sulfur is converted to inorganic sulfur, but the process is slow and requires specific biological conditions
Solution Approach 1:
The invention replaces the biological enzymatic system with a chemical system using amine compounds. This substitution eliminates the need for maintaining specific biological conditions (temperature, pH, moisture for enzyme activity) and achieves sulfur transformation through straightforward chemical reactions that proceed rapidly under standard conditions.
4Quantity of substance
If standard hydrodesulfurization catalysts are used, then sulfur is removed from hydrocarbon streams, but sulfur dioxide emissions increase during combustion
Solution Approach 1:
The invention converts the harmful effect of sulfur removal (which creates H2S that oxidizes to SO2) into a beneficial outcome by using amine compounds that form stable amine-sulfur complexes. These complexes can be decomposed or treated to produce less harmful sulfur compounds, thus converting the potential harm of sulfur removal into a beneficial low-emission process.
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 approach reduces elemental sulfur deposition by approximately 33% and prevents corrosion, effectively managing sulfur content in hydrocarbon streams and equipment, even in challenging conditions with high sulfur concentrations.
Implementation Method 1
The introduction of mercaptans into hydrocarbon fluids to convert elemental sulfur into disulfides and polysulfides
Implementation Method 2
which can be dissolved and solvated, preventing deposition on equipment
Implementation Method 3
allowing for removal through gas stripping or oil/water separation
Implementation Method 4
allowing for removal through gas stripping or oil/water separation
Data Source
AI summary
Methods for preventing elemental sulfur deposition from a hydrocarbon fluid is disclosed. A mercaptan is added to a hydrocarbon fluid that has elemental sulfur and reacted with the elemental sulfur to produce a disulfide and hydrogen sulfide. Amines and/or surfactants can assist with the process. Secondary reactions between the disulfide and the elemental sulfur result in a polysulfide and a solvated sulfur-disulfide complex. The disulfide, hydrogen sulfide, polysulfide and solvated sulfur-disulfide complex do not deposit, and can optionally be removed.