Gas Dehydration Glycol Solution pH Buffering
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Solution Overview
Problem
Gas dehydration processes face challenges in maintaining pH stability and preventing corrosion in gas dehydration units due to thermal or oxidative degradation, which generates carboxylic acids and lowers the pH of the drying agent solution, making it corrosive to mild steel.
Innovation Solution
Incorporating a cyclohexylamino sulfonic salt as a pH buffering agent in the gas dehydration drying agent solution, which maintains the pH within a desired range and minimizes corrosion, along with a glycol solvent and optional polyol additives, to effectively buffer against pH fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thermal or oxidative degradation occurs in the gas dehydration unit, then the drying agent solution can process more gas, but the pH decreases and corrosion increases
Solution Approach 1:
The patent converts the harmful effect of thermal degradation by adding牺牲性 buffering agents (cyclohexylamino sulfonic acid and its salts) that preferentially degrade instead of the glycol solvent. These buffering agents sacrifice themselves to maintain pH stability, transforming the harmful degradation process into a beneficial protective mechanism that prevents corrosion while allowing continuous gas processing.
Solution Approach 2:
The buffering agents act as intermediaries between the thermal degradation process and the glycol solvent system. They mediate the pH changes by absorbing the effects of degradation products (carboxylic acids) and preventing direct acidification of the glycol, thereby protecting the system from corrosion while maintaining processing capability.
2Productivity
If the pH of the drying agent solution decreases due to degradation, then more water can be removed from gas, but the solution becomes corrosive to mild steel
Solution Approach 1:
The patent employs buffering agents that undergo controlled degradation to neutralize the harmful pH decrease. The cyclohexylamino sulfonic acid and its salts serve as pH-stabilizing sacrifices that convert the harmful acidification process into a beneficial buffer system, allowing water removal to continue while preventing corrosive pH drops.
Solution Approach 2:
The buffering agents provide beforehand cushioning against pH changes by being pre-added to the system at concentrations (0.01-8.00 wt%) that can absorb anticipated acidification from degradation. This prior cushioning capacity allows the system to withstand thermal stress and degradation products without becoming corrosive, maintaining both productivity and equipment safety.
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 solution effectively maintains a stable pH range, reducing corrosion and extending the life of equipment by preventing acidic degradation, as demonstrated by improved alkalinity titration test results and thermal stability testing.
Implementation Method 1
Incorporating a cyclohexylamino sulfonic salt as a pH buffering agent in the gas dehydration drying agent solution, which maintains the pH within a desired range and minimizes corrosion
Implementation Method 2
a gas dehydration process may be performed on a gas stream to reduce the amount of water vapor present
Data Source
AI summary
Embodiments relate to a gas dehydration drying agent solution composition, comprising a solvent that includes at least one glycol having a number average molecular weight from 40 g/mol to 500 g/mol and from 0.01 wt % to 8.00 wt % of a cyclohexylamino sulfonic salt.