Chemical Pipework Cleaning with Sequestered Metal Ion Precipitation
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Solution Overview
Problem
Current chemical cleaning methods for pipework systems, especially closed loop systems, require large volumes of water for flushing and often result in wastewater discharge contaminated with metal ions, leading to environmental and financial issues, and fail to effectively remove tightly adhering metal oxides and dissolved contaminants.
Innovation Solution
A method involving a water-based cleaning fluid with phosphate ions, followed by pH adjustment using alkali metal salts to precipitate metal ions, separation of insoluble minerals, and assembly of a corrosion inhibitor package to protect the system, minimizing water usage and discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large volumes of water are used to flush out cleaning agents and dissolved metal ions, then the cleaning effectiveness is improved, but water consumption and wastewater discharge increase
Solution Approach 1:
The patent changes the chemical parameters of the cleaning solution by adding sequestering agents that alter the solubility and reactivity of metal ions. This allows effective cleaning to be achieved while reducing the volume of water needed for flushing, as the sequestering agents control the behavior of dissolved contaminants.
Solution Approach 2:
The patent introduces sequestering agents as intermediary substances that mediate between the cleaning agents and metal ions. These intermediaries form stable complexes with metal ions, preventing reprecipitation and enabling effective removal with reduced water volumes.
2Reliability
If cleaning agents are used to dissolve metal oxides, then removal of fouling elements is improved, but dissolved metal ion contamination increases
Solution Approach 1:
The patent converts the harmful effect of dissolved metal ions into a beneficial outcome by using sequestering agents to form stable, soluble complexes. These complexes prevent metal ion reprecipitation and corrosion, transforming the contamination problem into a protective mechanism.
Solution Approach 2:
The patent changes the chemical state of metal ions from free dissolved ions to sequestered complexes by adding chelating agents. This parameter change maintains cleaning effectiveness while eliminating the harmful effects of free metal ions through complex formation.
3Loss of substance
If cleaning agents are not fully removed before adding corrosion inhibitors, then water volume requirements are reduced, but corrosion inhibitor performance deteriorates
Solution Approach 1:
The patent uses sequestering agents as intermediaries that bridge the cleaning and corrosion inhibition stages. These agents continue to control metal ion behavior after cleaning, ensuring that corrosion inhibitors work effectively even when residual cleaning agents are present, thus reducing water volume requirements.
Solution Approach 2:
The patent merges the functions of cleaning and corrosion protection by using sequestering agents that perform both roles. This combination eliminates the need for complete removal of cleaning agents before adding corrosion inhibitors, reducing overall water consumption while maintaining protective performance.
4Reliability
If acid cleaning is used to remove mill scales and metal oxides, then cleaning effectiveness is improved, but environmental compliance becomes more difficult
Solution Approach 1:
The patent changes the pH parameters and chemical composition of the cleaning solution by incorporating sequestering agents. This allows effective acid cleaning to be achieved while controlling the solubility and discharge characteristics of metal ions, facilitating environmental compliance.
Solution Approach 2:
The patent converts the harmful discharged metal ions from acid cleaning into beneficial sequestered complexes. This transformation maintains cleaning effectiveness while converting the environmental liability of metal ion discharge into a controlled, compliant effluent stream.
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 method effectively removes metal oxides and dissolved contaminants, reducing water consumption and environmental impact, while ensuring the system's corrosion protection by forming insoluble compounds that are easily separable, thereby enhancing equipment performance and longevity.
Implementation Method 1
phosphate ions, which form insoluble compounds with metal ions
Implementation Method 2
followed by pH adjustment using alkali metal salts to precipitate metal ions
Data Source
AI summary
A process for chemical cleaning and corrosion inhibition of pipework, typically in closed loop systems, that avoids or significantly minimises the requirement for wastewater discharge where the system is first acidified using a mixture of cleaning agents capable of dissolving metal oxides. The method then precipitates any dissolved contaminants and separates the precipitate from the carrying fluid. Further elements of a combined corrosion inhibitor package are then added to any cleaning agent ions that remain in solution to develop a fully functional corrosion inhibition package to protect the metals of the system.