Low Molecular Weight Anionic Polymers for Silica Scale Inhibition
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Solution Overview
Problem
Current silica scale inhibitors are ineffective in maintaining high silica solubility in industrial water systems, leading to inefficient use and significant fouling issues, as they can only slightly increase silica levels before deposition occurs, and removing existing silica scales is difficult and costly.
Innovation Solution
The use of low molecular weight anionic polymers, specifically copolymers of methacrylic acid and polyethylene glycol allyl ether, which inhibit silica polymerization and deposition, allowing for increased silica dispersency and easier removal of existing scales, while being thermally stable and compatible with tracing technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If colloidal silica dispersants are used to inhibit silica deposition, then silica levels can be stabilized slightly, but the increase in silica cycles is undetectable and scale deposition still occurs
Solution Approach 1:
The patent changes the chemical parameters of the dispersant by using specifically designed low molecular weight anionic polymers with carboxylic acid functional groups and controlled molecular weights (500-5000 Da), achieving detectable and significant increases in silica cycles while preventing scale deposition
Solution Approach 2:
The patent employs composite polymer structures combining anionic polymer chains with carboxylic acid functional groups and controlled molecular weights, creating a synergistic effect that simultaneously increases silica solubility and prevents deposition
2Quantity of substance
If silica polymerization inhibitors are used to increase soluble silica, then silica scale formation is inhibited, but existing silica scales remain difficult to remove
Solution Approach 1:
The patent modifies the inhibitor parameters by using low molecular weight anionic polymers with specific carboxylic acid content and molecular weight ranges, which not only prevent polymerization but also soften and facilitate removal of existing scales through chelation and complexation effects
Solution Approach 2:
The anionic polymer acts as an intermediary substance that mediates between the silica scale and removal agents, softening the scale structure and enabling easier removal through enhanced solubility and reduced adhesion
3Reliability
If water treatment operations limit water-use efficiency to maintain silica solubility, then silica deposition is prevented, but water discharge volumes become large and system efficiency decreases
Solution Approach 1:
The patent changes the chemical environment parameters by introducing low molecular weight anionic polymers that shift the silica solubility equilibrium, allowing higher silica concentrations (500-1000 ppm) to be maintained without deposition, thereby enabling improved water-use efficiency and reduced discharge volumes
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 solution provides a greater than 50% increase in silica dispersency, slows silica polymerization, facilitates easier removal of existing scales, and maintains thermal stability, enabling efficient operation of industrial water systems without significant fouling.
Implementation Method 1
the one or more low molecular weight polymers are copolymers of methacrylic acid and polyethylene glycol allyl ether... effective inhibitors of soluble silica polymerization and scale deposition
Implementation Method 2
adding to the water in the water system 1 to 100 ppm of one or more low molecular weight anionic polymers... inhibiting the formation and deposition of silica and silicate compounds
Implementation Method 3
provides a >50% increase in the dispersency of both polymeric and monomeric silica... allowing for increased silica dispersency
Implementation Method 4
the chemistry is thermally stable at temperatures in excess of 300°C for greater than 5 hours
Data Source
AI summary
This invention relates to an improved method for inhibiting the formation and deposition of silica and silicate compounds in a water system. In particular, the method includes adding to the water system a relatively low molecular weight organic, anionic polymer. The polymer preferrably has an acrylic acid or methacrylic acid functionality and is preferrably selected from one or more of homopolymers of acrylic acid, a methacrylic acid/polyethylene glycol allyl ether copolymer, a homopolymer of methacrylic acid, an acrylic acid/polyethylene glycol allyl ether copolymer, and an acrylic acid/1-allyloxy-2-hydroxypropane sulfonic acid copolymer, homopolymers of maleic anhydride, copolymers of maleic anhydride and polyethylene glycol allyl ether, and combinations thereof.