Surfactant Blends for Membrane Cleaning
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Solution Overview
Problem
Conventional membrane cleaning compositions, particularly those using nonyl phenol ethoxylates (NPE), pose environmental concerns due to their non-biodegradability and estrogen-like properties, and fail to effectively clean membranes without causing damage or fouling, leading to reduced membrane performance and operational life.
Innovation Solution
A surfactant system comprising polyethylene glycol (PEG 1450), ethoxylated linear alcohol, alkoxylated Guerbet alcohol, and hexyl glucoside, which can be used alone or in combination as a booster in alkaline or acid cleaning compositions to improve membrane cleaning efficiency and biodegradability, reducing fouling and enhancing membrane performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If nonyl phenol ethoxylates (NPE) are used for cleaning membranes, then cleaning effectiveness is improved, but environmental harm increases due to non-biodegradability and estrogen-like properties
Solution Approach 1:
The patent changes the chemical parameters of the surfactant system by replacing NPE with a blend of alternative surfactants including alkyl polyglucosides, alkyl ethoxylates, and alkyl sulfonates. This parameter change maintains cleaning effectiveness while eliminating the harmful environmental properties of NPE, specifically its non-biodegradability and estrogen-like activity.
Solution Approach 2:
The invention uses a composite surfactant system comprising multiple different surfactant types working together. This composite approach combines the advantages of each surfactant class to achieve effective membrane cleaning while meeting environmental requirements, replacing the single-component NPE system with a multi-component blend that has superior environmental profile.
2Productivity
If conventional surfactants are used for cleaning, then cleaning power is improved, but membrane fouling increases leading to reduced operational life
Solution Approach 1:
The patent modifies the chemical parameters of the cleaning system by using a specific blend of surfactants with controlled HLB values and molecular structures. This parameter optimization enables effective removal of foulants while minimizing residual surfactant deposition on the membrane, thereby extending membrane operational life.
Solution Approach 2:
The surfactant blend acts as an intermediary that facilitates the removal of foulants from the membrane surface without causing damage. The specific composition of the blend ensures effective foulant detachment while the surfactants are designed to be readily rinsable, preventing secondary fouling and maintaining membrane performance over extended periods.
3Productivity
If high temperature cleaning is applied to remove fouling, then cleaning effectiveness is improved, but membrane damage increases due to thermal degradation
Solution Approach 1:
The patent replaces thermal energy (heat) with chemical energy in the form of enhanced surfactant action. The surfactant blend is formulated to provide effective cleaning at lower temperatures by improving wetting, emulsification, and solubilization of foulants, thereby eliminating the need for high-temperature cleaning that would compromise membrane integrity.
Solution Approach 2:
The invention changes the temperature parameter of the cleaning process by enabling effective cleaning at reduced temperatures. The surfactant blend's enhanced surface activity and solubilizing power allow for thorough foulant removal at temperatures that do not cause thermal degradation of the membrane material, thus preserving membrane reliability.
4Productivity
If frequent cleaning is performed to maintain flux, then membrane performance is maintained, but chemical degradation of membrane increases
Solution Approach 1:
The surfactant blend serves as a gentle intermediary cleaning agent that effectively removes foulants without requiring aggressive chemical conditions. The mild yet effective nature of the surfactants allows for frequent cleaning cycles without causing cumulative chemical degradation of the membrane, thus maintaining both flux and membrane stability over time.
Solution Approach 2:
The patent optimizes the chemical parameters of the cleaning solution by using a surfactant blend that achieves effective cleaning at lower concentrations and milder pH levels. This parameter optimization reduces the harshness of each cleaning cycle, enabling more frequent cleaning to maintain flux without accelerating membrane chemical degradation.
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 surfactant system effectively removes proteins, fats, and minerals from membranes, improving hydrophilicity and permeation properties, leading to higher flux rates and reduced fouling, thus extending membrane operational life and compliance with environmental regulations.
Implementation Method 1
The invention relates to methods and compositions for cleaning membranes used in separation facilities. The cleaning compositions can remove proteins and offer an environmentally friendly alternative surfactant system to nonyl phenol ethoxylate (NPE).
Implementation Method 2
Chemical energy in the form of detergents and cleaners can be used to solubilize or disperse the foulant or soil.
Implementation Method 3
Thermal energy in the form of heat can be used to help the action of the chemical cleaners.
Data Source
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AI summary
The present invention relates to the field of membrane separation processes and clean in place compositions for cleaning such membranes. The cleaning compositions can remove proteins, fats, and other food, beverage, and brewery based soils and offer an environmentally friendly alternative surfactant system to NPE. According to the invention, surfactants and polymers useful for this process are unpredictable and specific surfactants, polymers, and combinations of the same are disclosed for use alone, as part of a cleaning composition. Methods of use of the same are also included.