Hydrophobically Modified Si-Polyamine Scale Inhibitor
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Solution Overview
Problem
Existing chemical treatments for scale formation in industrial process streams, particularly those with high sulfate levels, finely dispersed iron oxide, and sodalite, are inefficient and impractical, as they require significant downtime and are difficult to apply to inaccessible surfaces.
Innovation Solution
Development of hydrophobically modified Si-containing polyamines that can be intermixed with process streams to effectively reduce or eliminate aluminosilicate scale, even in challenging environments, by incorporating specific recurring units and nitrogen-reactive compounds to enhance molecular weight and hydrophobicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical methods are used to remove scale, then scale removal is achieved, but process downtime increases and accessibility requirements worsen
Solution Approach 1:
The patent replaces mechanical scale removal methods with chemical treatment using hydrophobically modified Si-containing polyamines. The chemical composition actively dissolves and prevents scale formation on equipment surfaces, eliminating the need for mechanical scraping or cleaning operations that cause process downtime.
Solution Approach 2:
The chemical treatment is applied continuously to process streams before scale can form and accumulate to problematic levels. This preventive approach maintains equipment surfaces free of scale without requiring subsequent mechanical removal operations.
2Reliability
If conventional chemical treatments are used, then scale formation is addressed, but effectiveness deteriorates in streams with high sulfate, iron oxide, sodalite, and nitrate/nitrite
Solution Approach 1:
The patent modifies the chemical parameters of conventional polyamines by incorporating hydrophobic groups (such as alkyl chains or aromatic rings) at specific positions in the molecule. This structural modification changes the polymer's interaction properties with scale-forming minerals, enabling effective treatment in streams containing high concentrations of sulfate, iron oxide, sodalite, and nitrate/nitrite that previously rendered conventional treatments ineffective.
Solution Approach 2:
The invention creates a composite molecular structure combining hydrophilic regions (for water solubility and interaction with scale minerals) and hydrophobic regions (for resistance to interfering substances like iron oxide and sulfate). This amphiphilic composite structure enables the polymer to maintain effectiveness in complex, difficult-to-treat process streams.
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 hydrophobically modified Si-containing polyamines significantly reduce aluminosilicate scale formation, offering improved performance compared to less hydrophobic counterparts, and can be effectively applied to difficult-to-treat streams with high sulfate and nitrate/nitrite concentrations, minimizing downtime and increasing treatment efficiency.
Implementation Method 1
Surprisingly, it has been found that relatively hydrophobic Si-containing polymers may provide substantially higher performance than otherwise comparable polymers of lesser hydrophobicity
Data Source
AI summary
Hydrophobically modified Si-containing polyamines are useful for treating scale in industrial process streams. Preferred hydrophobically modified Si-containing polyamines are particularly useful for treating aluminosilicate scale in difficult-to-treat industrial process streams, such as in the Bayer alumina process streams, nuclear waste streams and kraft paper mill effluent streams.