Bacterial Alginate Superabsorbent Extraction via Acetone Precipitation
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Solution Overview
Problem
Current super-absorbent polymers (SAPs) face limitations in sustainability, cost, and performance, particularly due to their petroleum-based composition and small particle size, which restricts their application in agriculture and hygiene products, and existing methods for extracting biobased polymers from granular sludge often require harsh conditions and result in impure products.
Innovation Solution
A method for extracting low-density biobased polymers, such as bacterial alginate, using non-solvents like acetone to produce fibrous, non-woven materials with enhanced mechanical stability and super-absorbing characteristics, which can be used in various applications without further purification, and incorporating cross-linking agents to maintain stability and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If petroleum-based super-absorbent polymers are used, then absorbing capacity is improved, but sustainability and environmental friendliness deteriorate
Solution Approach 1:
The invention changes the chemical composition parameters by replacing petroleum-based polymers with biobased polymers derived from granular sludge, specifically using bacterial alginate as the primary component. This substitution maintains the absorbing capacity while fundamentally improving sustainability by using renewable biological materials instead of depleting petroleum resources.
Solution Approach 2:
The invention recovers valuable biobased polymers from granular sludge, which would otherwise be discarded as waste from wastewater treatment processes. By extracting and purifying bacterial alginate from the sludge, the invention transforms waste material into a high-value super-absorbent product, simultaneously improving sustainability and reducing waste disposal costs.
2Productivity
If biobased polymers are extracted using conventional methods, then product availability is improved, but purity and quality deteriorate due to harsh conditions and impurities
Solution Approach 1:
The invention introduces an intermediary purification step using ethanol precipitation to separate the biobased polymer from impurities. The ethanol acts as a mediator that selectively precipitates the bacterial alginate while leaving other contaminants in solution, thereby achieving high purity without requiring harsh chemical conditions or multiple complex purification stages.
Solution Approach 2:
The invention replaces harsh chemical extraction methods with a milder ethanol-based precipitation system. Instead of using strong acids, bases, or organic solvents that can degrade the polymer or leave harmful residues, the process uses ethanol precipitation followed by filtration, which is gentler on the polymer structure and produces a purer product with better mechanical properties.
3Speed
If small particle size SAPs are used, then absorption speed is improved, but application flexibility and structural integrity deteriorate
Solution Approach 1:
The invention segments the biobased polymer into controlled particle sizes through filtration and drying processes that produce a distribution of particle sizes. This segmentation allows smaller particles to provide rapid absorption while larger particles maintain structural integrity and prevent dust formation, giving manufacturers flexibility in selecting appropriate particle sizes for different applications such as diapers, wound dressings, or soil conditioners.
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 resulting biobased polymers exhibit superior absorbing capacities and mechanical stability, enabling their use in diverse products like diapers, wound dressings, and soil improvers, while being cost-effective and environmentally friendly, with improved durability and performance compared to traditional SAPs.
Implementation Method 1
extracting an ionic biopolymer, such as an anionic biopolymer, and specifically bacterial alginate (ALE) from an aqueous solution... 20-80 vol.%, preferably 30-60 vol. %, more preferably 35-55 vol.%, such as 40-50 vol.%, non-solvent, such as mono- or dialkyl ketones, such as acetone... to the solution. The acetone may typically have a water content of 5-25 %v/v... The mixing is preferably a vigorous mixing, e.g. using an impellor at relatively high speeds (600-1000 rpm). Surprisingly thereafter the biopolymer can be extracted from the solution with a relatively high yield.
Data Source
Figure 2~3
Figure 4a~6b
AI summary
The present invention is in the field of extraction a product for liquid absorption comprising a low-density biopolymer, such as obtainable from a granular sludge, in particular alginate or bacterial alginate, wherein the biobased polymer acts as a super-absorbing material, and a method of obtaining said product.