Partially Substituted Alkyl Phosphonate Scale Inhibitors
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Solution Overview
Problem
Traditional scale inhibitors, such as fully substituted amino phosphonates, are not environmentally friendly due to low biodegradability and potential bioaccumulation, and they do not effectively address scale formation issues in various industrial and oilfield applications.
Innovation Solution
Partial phosphonoalkylation of amino acids to produce scale inhibitors with greater than 50% di-substituted alkyl phosphonated species, which exhibit improved environmental properties and efficacy in inhibiting scale formation while demonstrating higher biodegradation and reduced toxicity to marine algae.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fully substituted amino phosphonates are used as scale inhibitors, then scale inhibition efficacy is improved, but environmental properties deteriorate due to low biodegradability and potential bioaccumulation
Solution Approach 1:
The patent applies local quality by creating a mixture of phosphonated amino acid species with different substitution degrees (mono-, di-, tri-) rather than using a single fully substituted species. This allows different molecular forms to coexist, where the di-substituted species provides good scale inhibition while the mixture as a whole achieves improved biodegradability compared to fully substituted compounds.
Solution Approach 2:
The patent changes the substitution parameter from 100% (fully substituted) to a controlled distribution where di-substituted species predominate. By controlling the phosphonoalkylation reaction conditions and using specific amino acids with multiple amino groups, the patent achieves a parameter shift that balances efficacy and environmental properties.
2Object-affected harmful factors
If partial phosphonoalkylation is used to improve biodegradability, then environmental properties are improved, but scale inhibition efficacy may be reduced
Solution Approach 1:
The patent applies partial action by intentionally stopping the phosphonoalkylation reaction before complete substitution occurs. By using controlled reaction conditions and selecting amino acids with multiple amino groups, the patent achieves predominant di-substitution rather than full substitution, maintaining sufficient scale inhibition capability while improving biodegradability.
Solution Approach 2:
The patent creates a composite mixture of different phosphonated amino acid species (mono-, di-, tri-substituted forms) rather than a single compound. This composite approach allows the mixture to exhibit both good scale inhibition properties and improved environmental biodegradability, as the different species complement each other's properties.
3Reliability
If traditional phosphonic acids are used, then scale formation is inhibited, but environmental acceptability deteriorates
Solution Approach 1:
The patent changes the molecular structure parameter by selecting amino acids with multiple amino groups as starting materials and controlling the degree of phosphonoalkylation. This structural modification, combined with controlling substitution degree, transforms traditional phosphonic acids into environmentally acceptable alternatives that maintain scale inhibition capability.
Solution Approach 2:
The patent creates biodegradable scale inhibitors that break down naturally in the environment, effectively making them 'short-living' in the environmental sense. This approach replaces persistent traditional phosphonic acids with compounds designed to degrade after performing their scale inhibition function, improving environmental acceptability.
Data Source
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AI summary
Alkyl phosphonates prepared from amino acids suitable for use in inhibiting scale. The phosphonates are obtained as reaction mixtures where the level of alkyl phosphonation is deliberately controlled to provide only partial alkyl phosphonation of the amino acid. The resulting alkyl phosphonates exhibit improved environmental properties compared to the fully substituted species, while still exhibiting acceptable efficacy in the control of scale. The compositions possess advantages over existing phosphonates in that they exhibit higher biodegradation by method OECD 306. They also offer lower toxicity to marine life compared to the fully substituted species and are not expected to bioaccumulate.