Cross-linked Polysiloxane Defoamer for Membrane-Compatible Paste Soap
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Solution Overview
Problem
Existing paste-like detergents used in washing processes that employ membrane filtration for wastewater purification often cause membrane blockage and inadequate foaming regulation, leading to process interruptions and environmental concerns due to high phosphate usage.
Innovation Solution
A detergent composition with a surfactant component, alkalinity sources, organic and inorganic builders, and a defoamer comprising cross-linked or partly cross-linked polysiloxanes with a three-dimensional structure, which maintains membrane compatibility and effectively regulates foaming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surfactant mixtures (fatty alcohol alkoxylates and fatty alcohols) are used in membrane-compatible detergent compositions, then membrane blockage is prevented and stable permeate flow is ensured, but excessive foaming occurs that interrupts continuous washing processes
Solution Approach 1:
The patent changes the chemical parameter of the defoaming agent from conventional linear silicon oils to cross-linked or partly cross-linked polysiloxanes with a three-dimensional structure. This structural parameter change enables the defoamer to effectively suppress foam while maintaining membrane compatibility, thus resolving the contradiction between reliability and productivity.
2Object-generated harmful factors
If linear silicon oils are used as defoamers in detergent compositions, then foaming is reduced, but membrane blockage occurs and permeate flow decreases
Solution Approach 1:
The patent changes the molecular structure parameter of the polysiloxane from linear to cross-linked or partly cross-linked with a three-dimensional structure. This structural modification allows the defoamer to reduce surface tension effectively for foam control while the cross-linked structure prevents membrane adhesion and blockage, thus resolving the contradiction between foam control and membrane compatibility.
3Reliability
If high amounts of phosphates are used in detergent compositions, then washing performance is improved, but environmental harm increases and membrane purification is compromised
Solution Approach 1:
The patent changes the chemical composition parameter by replacing phosphates with phosphonates and other phosphate-free builders. This substitution maintains the water softening and washing performance functions while eliminating the environmental harm associated with phosphate discharge, thus resolving the contradiction between washing performance and environmental impact.
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 prevents membrane blockage, ensures stable permeate flow, and reduces foaming issues, allowing for continuous washing processes while being environmentally friendly by minimizing phosphate use and maintaining biodegradability.
Implementation Method 1
a defoamer comprising cross-linked or partly cross-linked polysiloxanes having a three-dimensional structure
Implementation Method 2
the waste water is purified by a membrane filtration unit and especially by a membrane filtration unit comprising one or more reverse osmosis steps
Implementation Method 3
membrane filtration unit comprising one or more reverse osmosis steps
Data Source
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AI summary
The invention relates to a paste-like cleaning or detergent composition comprising a) a surfactant component comprising a compound of the general formula R1-COOM (I), wherein R1 represents a linear or branched alkyl- or alkenyl residue with 8 to 22 carbon atoms and M represents an alkali metal ion; a fatty alcohol alkoxylate and/or an oxo alcohol alkoxylate with 8 to 22 carbon atoms and an average degree of alkoxylation of at least 5; and optionally an anionic surfactant; b) a compound of the general formula R2-O-R3 (II), wherein R2 represents a linear or branched alkyl or alkenyl residue with 8 to 22 carbon atoms and R3 represents hydrogen or a linear or branched alkyl residue with 1 to 8 carbon atoms; c) water and/or a compound of the general formula X-CH2-(CHY)n-CH2-Z (Hi), d) wherein n is an integer of from 0 to 2 and X, Y and Z independently symbolize hydrogen or a hydroxyl group provided that at least 2 hydroxyl groups are present; e) one or more alkalinity sources f) one or more organic and/or anorganic builders on a non-silicate basis; g) a defoamer comprising crosslinked or partly crosslinked polysiloxane having a three dimensional structure.