Anticorrosive Mixing Vessel for Nb Compound Dissolution
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Solution Overview
Problem
The existing methods for preparing composite metal oxide catalysts face challenges in achieving uniformity due to the partial undissolution of niobium compounds and deposition of dicarboxylic acids, particularly at industrial scales, leading to reduced yield and productivity.
Innovation Solution
An apparatus with an anticorrosive mixing vessel equipped with stirring, heating, cooling units, and a filter under increased pressure is used to prepare a mixed solution containing dicarboxylic acid and niobium compounds, ensuring thorough dissolution and filtration of undissolved compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a dicarboxylic acid is added to dissolve Nb compound at laboratory scale, then the Nb compound dissolves, but at industrial scale the Nb compound partially remains undissolved and dicarboxylic acid deposits in pipes
Solution Approach 1:
The patent applies parameter changes by optimizing the dicarboxylic acid to Nb compound molar ratio within a specific range (1:1 to 10:1), controlling temperature (20-100°C), and adjusting mixing time (1-48 hours) to achieve complete dissolution at industrial scale while preventing acid deposition, thereby resolving the contradiction between dissolution efficiency and solution uniformity
Solution Approach 2:
The patent employs preliminary action by conducting thorough mixing and dissolution operations before filtration, ensuring that the Nb compound is completely dissolved in the dicarboxylic acid solution prior to the filtration step, which prevents subsequent deposition issues in pipes and achieves uniform catalyst composition
2Quantity of substance
If dicarboxylic acid is added in larger amount than intended, then Nb compound dissolves completely, but dicarboxylic acid deposits in the middle of pipes
Solution Approach 1:
The patent controls the dicarboxylic acid to Nb compound molar ratio within a specific range (1:1 to 10:1) to ensure complete dissolution while preventing excess acid that would cause deposition in pipes, thereby eliminating the harmful effect of acid deposition while maintaining complete dissolution
Solution Approach 2:
The patent implements feedback control by monitoring the dissolution process and adjusting the dicarboxylic acid addition amount based on the Nb compound concentration, ensuring that the acid is added in the precise amount needed for complete dissolution without excess that would lead to pipe deposition
3Ease of manufacture
If metal salt-containing slurry is not in uniform state, then preparation process is simpler, but the catalyst obtained is ununiformed and fails to provide optimized composition
Solution Approach 1:
The patent applies preliminary action by ensuring complete dissolution of the Nb compound in the dicarboxylic acid solution before preparing the final slurry for spray drying, which guarantees uniform catalyst composition in the final product while maintaining a simple preparation process
Solution Approach 2:
The patent optimizes parameters including the dicarboxylic acid to Nb compound molar ratio (1:1 to 10:1), temperature (20-100°C), and mixing time (1-48 hours) to achieve complete dissolution and uniform slurry preparation, thereby maintaining both ease of manufacture and manufacturing precision
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 approach enhances niobium yield and productivity by reducing undissolved or deposited niobium compounds and achieving a uniform mixed solution, improving the catalyst preparation process.
Implementation Method 1
a mixing vessel for preparing an aqueous mixed solution containing a dicarboxylic acid and a Nb compound and; a filter for the aqueous mixed solution connected to the mixing vessel via a pipe, the mixing vessel being anticorrosive and equipped with a stirring unit, a heating unit and a cooling unit for the aqueous mixed solution
Implementation Method 2
a mixing vessel being anticorrosive and equipped with a stirring unit, a heating unit and a cooling unit for the aqueous mixed solution
Implementation Method 3
a mixing vessel being anticorrosive and equipped with a stirring unit, a heating unit and a cooling unit for the aqueous mixed solution
Implementation Method 4
the aqueous mixed solution prepared in the mixing vessel is fed to the filter via the pipe and filtered in the filter under an increased pressure
Data Source
AI summary
An apparatus for producing a mixed solution, comprising a mixing vessel for preparing an aqueous mixed solution containing a dicarboxylic acid and an Nb compound and a filter for the aqueous mixed solution connected to the mixing vessel via a pipe, the mixing vessel being anticorrosive and equipped with a stirring unit, a heating unit and a cooling unit for the aqueous mixed solution, wherein the aqueous mixed solution prepared in the mixing vessel is fed to the filter via the pipe and filtered in the filter under increased pressure.