Regenerating Heteropolymolybdophosphoric Acid Catalyst
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Solution Overview
Problem
Existing methods for regenerating deactivated heteropolymolybdophosphoric acid catalysts are cumbersome, time-consuming, and fail to achieve satisfactory catalytic activity, leading to catalyst degradation and reduced lifespan.
Innovation Solution
A process involving grinding the catalyst to 40 mesh or less, mixing with aqua ammonia, ammonium ions, and organic auxiliaries, kneading to form a paste, drying, molding into cylindrical particles with a through hole, and calcining at 350-450°C for 1-10 hours to recover the keggin structure and catalytic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional regeneration methods are used, then the catalyst can be regenerated, but the process is cumbersome and time-consuming
Solution Approach 1:
The patent applies parameter changes by optimizing the calcination temperature (350-450°C) and time (1-10 hours) to achieve efficient regeneration. By controlling these parameters, the catalyst structure is restored without requiring complex multi-step processes, thus reducing regeneration time while maintaining effectiveness
Solution Approach 2:
The patent employs preliminary action by pre-treating the deactivated catalyst with ammonium fluoride solution before calcination. This preliminary step prepares the catalyst surface and structure for more efficient regeneration during calcination, reducing the overall time and complexity of the regeneration process
2Reliability
If conventional regeneration methods are used, then the catalyst can be regenerated, but satisfactory catalytic activity is not achieved
Solution Approach 1:
The patent uses parameter changes by precisely controlling the calcination temperature range (350-450°C) and duration (1-10 hours) to restore the catalyst's active sites and structural integrity. This parameter optimization ensures high catalytic activity is achieved while simplifying the regeneration process
Solution Approach 2:
The patent introduces ammonium fluoride as an intermediary substance that facilitates the regeneration process. The ammonium fluoride treatment acts as a mediator that prepares the catalyst structure for effective regeneration, enabling restoration of catalytic activity without complex procedures
3Productivity
If the catalyst is used for extended time, then production capacity is maintained, but the catalyst degrades and activity deteriorates
Solution Approach 1:
The patent applies preliminary action by implementing regular preventive regeneration treatments during the catalyst's operational life. By performing regeneration before complete degradation occurs, the catalyst maintains high stability and activity throughout extended operation periods
Solution Approach 2:
The patent employs feedback mechanisms by monitoring catalyst performance parameters during operation and triggering regeneration when degradation signs appear. This feedback-based approach ensures the catalyst maintains optimal performance while extending its operational lifespan
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 regenerated catalyst exhibits well-recovered catalytic activity, maintaining performance in selective oxidation reactions for extended periods without deterioration, with high conversion and selectivity of methacrylic acid production from methacrolein.
Implementation Method 1
kneading same in a kneader to obtain a paste
Implementation Method 2
drying the paste
Implementation Method 3
molding same into a cylindrical particle with a through hole in its longitudinal axis
Implementation Method 4
calcining in atmosphere at a of from 350 to 450° C. for 1 ̃10 hours to produce a regenerated catalyst
Implementation Method 5
selective oxidation of lower unsaturated aldehydes to prepare unsaturated acids
Implementation Method 6
the use of the regenerated catalyst in the selective oxidation of lower unsaturated aldehydes to prepare unsaturated acids
Data Source
AI summary
The present invention provides a process for regenerating a deactivated heteropolymolybdophosphoric acid catalyst, comprising the steps of grinding the deactivated catalyst into particles having a particle size of 40 mesh or less, mixing the particles with a mixture comprising aqua ammonia, an aqueous solution containing ammonium ions and organic auxiliaries, kneading the same in a kneader to obtain a paste, drying the paste, molding the paste into cylindrical particles with a through hole in its longitudinal axis, and heating the paste in atmosphere at 350˜450° C. for 1˜10 hours to produce the generated catalyst.