Gem-Diphosphonic Sorbent for Indium Extraction
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Solution Overview
Problem
Current ion-exchange and sorption materials exhibit reduced selectivity and capacity for indium extraction due to steric hindrance and complex geometry, requiring complex pH adjustments and expensive monomers, limiting industrial-scale production and application.
Innovation Solution
Introducing gem-diphosphonic functional groups into spherically granulated cross-linked acrylonitrile-divinylbenzene copolymers using phosphorous acid, simplifying the production process and increasing selectivity and capacity by forming a complex-forming sorbent with improved steric conformation and coordination bonds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If iminodiacetate group-containing sorbents are used for selective sorption of indium, then selectivity for indium is improved (70-80%), but the sorbent capacity is reduced (0.184 mmol/g) and pH adjustment is required
Solution Approach 1:
The patent changes the chemical parameter of the functional groups from iminodiacetate to phosphonic and gem-diphosphonic groups, which fundamentally alters the sorption mechanism. This parameter change enables the sorbent to achieve both high capacity and high selectivity for indium without requiring pH adjustment, as phosphonic groups maintain effective sorption across a broader pH range
Solution Approach 2:
The patent creates a composite sorbent structure by introducing gem-diphosphonic groups into a cross-linked macroporous polymer matrix. This composite approach combines the high capacity benefits of the polymer structure with the high selectivity of phosphonic groups, achieving synergistic effects that resolve the contradiction between capacity and selectivity
2Quantity of substance
If phosphonic group-containing sorbents are used, then capacity and selectivity for indium are improved, but production complexity and cost increase due to expensive monomers and multi-step processes
Solution Approach 1:
The patent performs preliminary action by introducing phosphonic groups during the polymerization stage rather than requiring separate post-synthesis modification steps. The phosphonic acid is incorporated into the polymer matrix as the polymer forms, eliminating the need for complex multi-step processes and expensive specialized monomers that would be required if modification were done afterward
Solution Approach 2:
The patent uses a simplified model approach where phosphonic acid directly interacts with the polymer matrix during synthesis, creating a reproducible structure that can be manufactured at scale. This copying of the successful laboratory synthesis method to industrial production eliminates the need for complex equipment and multiple processing steps
3Ease of manufacture
If conventional sorbent structures are used, then production is simpler, but steric hindrance reduces selectivity due to distorted geometry and poor availability of functional groups
Solution Approach 1:
The patent employs a macroporous polymer structure that provides open channels and cavities, eliminating steric hindrance by ensuring functional groups are accessible on pore surfaces rather than buried in distorted conformations. This porous architecture maintains production simplicity while dramatically improving functional group availability and selectivity for indium coordination
Solution Approach 2:
The patent uses spherically granulated polymer beads with controlled cross-linking that creates a regular, non-distorted geometry. This spherical morphology with uniform pore distribution prevents the geometric distortion that causes steric hindrance, allowing functional groups to maintain optimal coordination geometry for indium binding while keeping the manufacturing process simple
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 method enhances the sorbent's selectivity and capacity for indium extraction, facilitating industrial-scale production and broader application in nonferrous metallurgy, hydrometallurgy, and chemical industries, while reducing production complexity and costs.
Implementation Method 1
introducing gem-diphosphonic functional groups by the treatment of a spherically granulated cross-linked macroporous acrylonitrile-divinylbenzene copolymer with molten dehydrated phosphorous acid
Implementation Method 2
complex-forming sorbent for selective extraction of indium
Implementation Method 3
method for producing a complex-forming sorbent for selective extraction of indium
Implementation Method 4
formation of coordinatively saturated complexes of indium with the functional groups
Data Source
AI summary
The invention relates to the field of ion exchange with the formation of a complex or chelate by using complex-forming polymers and can be used in nonferrous metallurgy and hydrometallurgy of indium for extraction of indium from wastewaters, as well as in the chemical industry and for producing special-purity substances. A method for producing a complex-forming sorbent for selective extraction of indium is proposed, wherein the method comprises the introduction of gem-diphosphonic functional groups, and wherein, in order to increase the selectivity and sorption capacity for indium, the gem-diphosphonic functional groups are introduced by the treatment of a spherically granulated cross-linked macroporous acrylonitrile-divinylbenzene copolymer with phosphorous acid at temperature of from 140 to 160°C for from 13 to 35 hours. In the presence of a diluent (chlorobenzene), the method is carried out at a temperature of between 100 and 130°C. The technical result is to introduce gem-diphosphonic functional groups by the treatment of spherically granulated cross-linked macroporous acrylonitrile-divinylbenzene copolymer with phosphorous acid, which simplifies the method for production and increases capacity and selectivity of the synthesized sorbent for indium, thus improving a complex of the application properties of the material.