Stable Anti-Corrosion Formulations via Carboxyl Extraction
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Solution Overview
Problem
Corrosion-inhibiting formulations containing sulfur-based derivatives, such as thioglycolic acid, are unstable and release toxic hydrogen sulfide during storage, posing health risks and handling challenges in the oil and gas industry, while existing H2S scavengers are not effective in stabilizing these formulations or are hazardous to use.
Innovation Solution
Incorporating specific sulfur-based compounds with a —SH or —S−Mp+ group and a —C-G-C— sequence, excluding carboxyl groups, which enhance stability and reduce H2S release, such as mercapto ethers and alk(en)yl thioglycolates, alongside amine derivatives and solvents, to create stable and non-toxic corrosion-inhibiting formulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfur-based derivatives (e.g., thioglycolic acid, mercapto alcohol) are added to enhance corrosion inhibition performance, then the effectiveness of the formulation is improved, but the formulation becomes unstable during storage and releases toxic hydrogen sulfide
Solution Approach 1:
The patent removes the carboxyl group from the sulfur-based derivative structure, extracting the harmful decomposition pathway that leads to H2S release while preserving the corrosion inhibition functionality through the retained —SH or —S−Mp+ group and —C-G-C— sequence
Solution Approach 2:
The patent changes the chemical structure parameters of the sulfur-based derivative by eliminating the carboxyl group and specifying molecular mass ranges (90-1000 g·mol−1), which fundamentally alters the stability characteristics and prevents H2S generation during storage
2Reliability
If sulfur-based derivatives are used to improve corrosion protection, then the anti-corrosion effectiveness is enhanced, but the formulation develops nauseating odors and becomes difficult to handle
Solution Approach 1:
The patent extracts the carboxyl group responsible for decomposition and odor generation, leaving a stable molecular structure that maintains corrosion protection while eliminating handling hazards and unpleasant odors
Solution Approach 2:
The patent converts the potentially harmful sulfur-based derivative into a beneficial stable compound by removing the carboxyl group, transforming a substance that would decompose into H2S into one that provides long-term stable corrosion inhibition
3Object-generated harmful factors
If conventional H2S scavengers (e.g., alkanolamines, oxidizing agents) are added to trap hydrogen sulfide, then the H2S release is reduced, but the formulation becomes more corrosive or introduces other hazards
Solution Approach 1:
The patent takes out the need for separate H2S scavengers by eliminating the H2S generation source (carboxyl group) from the sulfur-based derivative, achieving H2S control without introducing additional corrosive or hazardous substances
Solution Approach 2:
The patent uses the modified sulfur-based derivative structure itself as the intermediary that prevents H2S formation, eliminating the need for separate scavenger substances and their associated drawbacks
Data Source
AI summary
The present invention concerns the use of at least one compound A comprising at least one —SH or —S—, M+group, at least one —C-G-C— chain, in which G represents an atom from column 16 of the periodic table, not comprising a carboxy group —C(═O)—OH or —C(═O)—O—, and of a molar mass of between 90 g·mol-1 and 1000 g·mol-1, as an additive in a formulation inhibiting corrosion in metals used in the oil industry, and more generally in any kind of industry involving the drilling of ores or fossil compounds, such as gas or oil, in order to improve both the anti-corrosion performance and the storage stability of same. The invention also concerns said corrosion-inhibiting formulations comprising at least one compound A.