Polyester Polyamine Corrosion Inhibitors for Metal Surfaces
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Solution Overview
Problem
Current corrosion inhibitors used in the oil and gas industry, as well as in refineries, often fail to meet stringent environmental regulations regarding biodegradation and bioaccumulation, while also requiring improved technical performance, especially in environments with high electrolyte concentrations and acidic conditions.
Innovation Solution
The development of polyesteramine or polyester polyquaternary ammonium compounds, produced by condensing fatty acids, dicarboxylic acids, and alkoxylated fatty amines, with optional quaternization, serves as effective corrosion inhibitors for metal surfaces, offering enhanced environmental properties and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional corrosion inhibitors (fatty amines, quaternary ammonium compounds) are used, then corrosion protection is provided, but environmental regulations regarding biodegradation and bioaccumulation are not met
Solution Approach 1:
The patent changes the chemical structure parameters of corrosion inhibitors by introducing polyester backbone structures with specific molecular weights and functional groups. This modifies the biodegradation rate and bioaccumulation potential while preserving corrosion inhibition effectiveness, thus resolving the contradiction between reliability and environmental harm.
Solution Approach 2:
The invention creates composite molecular structures combining polyester backbones with amine or quaternary ammonium functional groups. This composite approach allows optimization of both environmental compatibility (through biodegradable polyester) and corrosion protection (through retained functional groups), simultaneously addressing both requirements.
2Reliability
If corrosion inhibitors are used in high electrolyte concentrations and acidic conditions, then corrosion protection is needed, but current inhibitors fail to provide sufficient technical performance
Solution Approach 1:
The patent applies local quality by creating polyester structures with specifically positioned functional groups that can locally adapt to harsh conditions. The molecular architecture includes regions optimized for acid resistance and electrolyte stability while maintaining overall biodegradability, enabling effective corrosion protection in challenging environments.
Solution Approach 2:
The invention modifies physical-chemical parameters of the inhibitor molecules including molecular weight distribution, functional group density, and hydrophobicity ratios. These parameter adjustments enhance performance in high electrolyte concentrations and acidic conditions while maintaining environmental compatibility.
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
These compounds demonstrate high efficacy in protecting metal surfaces from corrosion, particularly in harsh environments, while exhibiting good biodegradability and low bioaccumulation, meeting regulatory requirements and providing substantial protection even at low dosages.
Implementation Method 1
the use of a polyesteramine or a polyester polyquaternary ammonium compound as a corrosion inhibitor for metal surfaces
Data Source
AI summary
The present invention relates to the use of a product obtainable by the reaction of a fatty acid, or mixture of acids, having the formula R1COOH (I); and a dicarboxylic acid or a derivative thereof having the formula (IIa) or (IIb) with an alkoxylated fatty amine having the formula (III) or a partial or wholly quaternised derivative thereof; optionally said reaction between the fatty acid, the dicarboxylic acid and the alkoxylated fatty amine is being followed by a further reaction step wherein part or all of the nitrogen atoms are quaternised by reaction with an alkylating agent R5X; as a corrosion inhibitor for metal surfaces. The present invention also relates to such products and to methods for their production.