Alkyl Polyglucoside Surfactant Membrane Cleaning
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Solution Overview
Problem
Membrane fouling in dairy separation facilities due to protein, fat, and minerals leads to flux decline, and current surfactants like nonylphenol ethoxylates are restricted due to environmental concerns, necessitating an alternative that maintains cleaning performance and membrane compatibility.
Innovation Solution
A composition comprising non-ionic surfactants with specific ethoxylation ranges and molecular weights, along with optional water-soluble solvents or hydrotropes, designed to maintain membrane flux and be environmentally friendly, avoiding regulatory restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If nonylphenol ethoxylates are used as surfactants for cleaning membranes, then cleaning performance is improved, but environmental harm and regulatory restrictions worsen
Solution Approach 1:
The patent changes the chemical parameters of the surfactant by replacing nonylphenol ethoxylates with alkyl polyglucosides, which have different molecular structure and environmental properties. This substitution maintains the surfactant's cleaning functionality while eliminating the harmful bioaccumulative and endocrine-disrupting effects of nonylphenol ethoxylates
Solution Approach 2:
The patent employs biodegradable surfactants that break down quickly in the environment, replacing persistent harmful chemicals. The alkyl polyglucoside surfactants are designed to be environmentally benign and rapidly degradable, effectively treating the cleaning agent as a temporary, non-persistent substance that does not accumulate in the environment
2Object-affected harmful factors
If alternative surfactants are used to replace nonylphenol ethoxylates, then environmental friendliness is improved, but cleaning performance and membrane compatibility may worsen
Solution Approach 1:
The patent optimizes the molecular weight and ethoxylation parameters of the alternative surfactant to match the performance characteristics of nonylphenol ethoxylates. By carefully controlling these parameters, the invention achieves comparable wetting, emulsification, and flux maintenance capabilities while using an environmentally safer chemical basis
Solution Approach 2:
The patent uses composite surfactant systems combining alkyl polyglucosides with other compatible surfactants and cleaning agents to achieve the complex performance requirements previously met by nonylphenol ethoxylates. This composite approach allows the formulation to deliver effective membrane cleaning and flux maintenance while maintaining environmental compatibility
3Productivity
If membrane cleaning is performed to remove fouling, then flux efficiency is improved, but use of harmful surfactants worsens environmental impact
Solution Approach 1:
The patent employs biodegradable surfactants that rapidly decompose in the environment, ensuring that the cleaning agents used to restore flux efficiency do not persist as contaminants. The alkyl polyglucoside surfactants are designed to break down quickly, preventing long-term environmental accumulation while effectively cleaning membranes
Solution Approach 2:
The patent converts the potential harm of surfactant residue into a benefit by using biodegradable surfactants that naturally decompose. The very act of using surfactants for cleaning, which could leave harmful residues, is transformed into a beneficial process where the surfactants perform their cleaning function and then safely degrade, improving flux without creating persistent contamination
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 effectively cleans membranes, maintaining flux efficiency and being biodegradable, thus addressing the limitations of traditional surfactants while adhering to environmental regulations.
Implementation Method 1
Nonylphenol ethoxylates (NPE) have played an important role in the cleaning and performance efficiency of membrane filtration systems utilized in dairy applications. NPE 9 (9 mole ethoxylate of nonyl phenol) and other phenol ethoxylates have been the standard surfactant used in the cleaning of most membrane systems
Implementation Method 2
The cleaning procedure for filtration membranes can involve a clean-in-place process where cleaning agents are circulated over the membrane to wet, penetrate, dissolve and/or rinse away foreign materials from the membrane
Data Source
AI summary
A composition is disclosed for cleaning a membrane. The composition includes: (i) a non-ionic surfactant having the formula: R—O(CH2CH2O)nH, wherein R is a branched, substituted or unsubstituted, C11-15 alkyl group, wherein n is an average degree of ethoxylation, and wherein n is in the range of from 3 to 20; and (ii) at least one of an additional non-ionic surfactant, a water soluble solvent, or a hydrotrope. In one version of the composition, an upper limit of a range of molecular weights of the surfactant is 1300 grams or below. In another version of the composition, the composition has a gel point such that it will be in the liquid phase before and after dilution with any amount of water at all temperatures of 40° F. and above. A method of cleaning a membrane using the compositions is also disclosed.