Mesoporous Anatase TiO2 Sol via Peptisation
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Solution Overview
Problem
The existing methods for preparing anatase titanium dioxide sols on an industrial scale are costly and require complex processing steps, involving expensive raw materials and extensive equipment, making them inefficient and time-consuming.
Innovation Solution
A method involving the mixing of a metatitanic acid suspension from the sulphate process with a zirconyl compound and optionally silicon dioxide, followed by peptisation, which eliminates the need for neutralisation and filtration steps, using readily available and inexpensive industrial-scale materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods using expensive metalorganic TiO2 sources are used, then high TiO2 quality is achieved, but manufacturing cost increases significantly
Solution Approach 1:
The patent replaces expensive metalorganic TiO2 sources with inexpensive industrial by-products (metatitanic acid from sulfate process, titanium sulfate, or titanyl sulfate) that can be disposed of after use without significant environmental impact, thereby dramatically reducing manufacturing cost while maintaining acceptable TiO2 quality
Solution Approach 2:
The patent changes the chemical parameters of the starting materials from high-purity metalorganic compounds to industrial by-products with different compositional parameters (containing sulfate impurities), and compensates through process parameter optimization (pH control, temperature, addition sequence) to achieve the desired product quality
2Manufacturing precision
If multiple process steps including neutralisation and filtration are implemented, then salt removal is achieved, but processing time and equipment requirements increase
Solution Approach 1:
The patent extracts and eliminates the neutralisation and filtration steps from the conventional process sequence, retaining only the essential hydrolysis and peptisation steps, thereby reducing processing time and equipment requirements while still achieving acceptable salt removal through modified process conditions
Solution Approach 2:
The patent performs preliminary hydrolysis of the titanium compound under controlled conditions to pre-form the desired colloidal structure before peptisation, which eliminates the need for subsequent neutralisation and filtration steps that would otherwise be required to remove salts
3Quantity of substance
If conventional hydrolysis methods are used, then TiO2 sol is produced, but the process requires extensive equipment and multiple stable process steps
Solution Approach 1:
The patent merges the hydrolysis and peptisation steps into a single integrated process sequence that can be performed in one reactor vessel, eliminating the need for separate equipment for neutralisation, filtration, and peptisation, thereby reducing device complexity while maintaining TiO2 sol production capability
Solution Approach 2:
The patent uses a single reactor vessel to perform multiple functions: hydrolysis of titanium compound, peptisation to form colloidal sol, and pH adjustment, thereby eliminating the need for multiple specialized pieces of equipment and simplifying the overall process configuration
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
This method significantly reduces processing time and equipment requirements, maintaining high TiO2 content and BET surface area while introducing zirconium, which is often desirable in catalytic applications, and allows for the production of mesoporous anatase TiO2 with enhanced thermal stability.
Implementation Method 1
followed by peptisation, which eliminates the need for neutralisation and filtration steps
Implementation Method 2
by hydrolysis of a solution containing titanyl sulphate
Data Source
AI summary
The invention relates to the preparation of a titanium dioxide-containing sol which contains a titanium compound which is preferably obtained when T1O2 is prepared according to the sulphate method by hydrolysis of a solution containing titanyl sulphate and/or which has a microcrystalline anatase structure and contains a zirconium compound, and the titanium dioxide sol obtained thereby and use thereof.