Corrosion Inhibiting Composition for Sour Systems

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Solution Overview

Problem

Carbon steel pipelines transporting hydrocarbon fluids containing elemental sulfur or polysulfides face significant corrosion challenges, with conventional corrosion inhibitor compositions being ineffective in sour systems and causing issues like emulsification and foaming when used in large quantities.

Innovation Solution

A corrosion-inhibiting composition comprising a salt of a fatty acid-amine condensate, cationic surfactant, substituted aromatic amine, phosphoric acid ester, solvent stabilizer, demulsifier, organic sulfur compound, and aromatic solvent, which is applied to the metal surface to reduce or prevent corrosion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If large quantities of solvents or corrosion inhibitor compositions are added to protect carbon steel pipelines from corrosion in sour systems, then corrosion protection is improved, but emulsification and foaming problems occur

Engineering Contradiction:

Improvecorrosion protectionVSAvoidemulsification and foaming

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The invention changes the chemical composition parameters by using a specific combination of fatty acid-amine condensate (2-30 wt%), substituted aromatic amine (1-40 wt%), and phosphoric acid ester (1-30 wt%), replacing conventional inhibitor compositions. This parameter change achieves effective corrosion protection in sour systems without causing emulsification or foaming problems

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite corrosion inhibitor composition by combining multiple functional components: fatty acid-amine condensate (corrosion inhibition), substituted aromatic amine (surface adsorption), phosphoric acid ester (corrosion protection), cationic surfactant (surface activity), and demulsifier (emulsion breaking). This composite approach provides synergistic effects that protect against corrosion while preventing harmful emulsification and foaming

Inventive Principle:

Principle #40Composite materials

2Reliability

If conventional corrosion inhibitor compositions are used in sour systems, then some corrosion protection is achieved, but they are ineffective against pitting and general corrosion in highly corrosive environments

Engineering Contradiction:

Improvecorrosion protectionVSAvoidpitting and general corrosion

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention modifies the chemical parameters by incorporating phosphoric acid ester (1-30 wt%) which provides enhanced protection against pitting corrosion, and substituted aromatic amine (1-40 wt%) which offers superior adsorption characteristics in highly corrosive sour environments, making the composition effective against both pitting and general corrosion

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The fatty acid-amine condensate component provides localized protection at the metal surface through film formation, creating a protective barrier specifically where corrosion occurs, while the bulk composition maintains system compatibility

Inventive Principle:

Principle #3Local quality

3Reliability

If corrosion inhibitor compositions are added to hydrocarbon fluids containing elemental sulfur or polysulfides, then corrosion protection is improved, but the compositions are expensive

Engineering Contradiction:

Improvecorrosion protectionVSAvoidcost

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The invention optimizes the concentration parameters to use smaller, more economical amounts: fatty acid-amine condensate (2-30 wt%), cationic surfactant (1-40 wt%), substituted aromatic amine (1-40 wt%), and phosphoric acid ester (1-30 wt%). This optimized formulation achieves effective corrosion protection at lower dosages, reducing overall cost compared to conventional compositions that require large quantities

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses cost-effective chemical components with proven efficacy: fatty acid-amine condensates derived from natural sources, commercially available substituted aromatic amines, and phosphoric acid esters. These relatively inexpensive materials provide effective corrosion protection without the high costs associated with conventional inhibitor compositions

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 composition provides greater than 90% corrosion protection for carbon steel surfaces in high-pressure sour corrosion tests, effectively inhibiting both pitting and general corrosion across a wide range of temperatures and conditions.

Implementation Method 1

contacting the corrosion-inhibiting composition with the metal surface to reduce, inhibit or prevent corrosion of the metal surface

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentUS10604710B2Corrosion inhibiting compositions to mitigate corrosion in environments containing elemental sulfur and/or polysulfides

Publication Date: 2020.03.31 CHAMPIONX USA INC

AI summary

A corrosion inhibiting composition is provided which comprises a salt of a fatty acid-amine condensate and an aromatic solvent. The composition can be used in reducing, inhibiting or preventing corrosion of a metal surface used in recovery, transportation, refining or storage of a hydrocarbon fluid containing elemental sulfur or polysulfide.