Vanadium-Titanium-Phosphorous Catalyst Regeneration via Steam
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Solution Overview
Problem
Conventional methods for regenerating vanadium-titanium-phosphorous catalysts used in producing unsaturated carboxylic acids, such as acrylic acid, face challenges including low selectivity, high regeneration temperatures, and safety risks due to high oxygen levels, which increase the cost and risk of explosions.
Innovation Solution
A process involving the use of steam as a regeneration agent at temperatures similar to those used in the production process, allowing for effective catalyst regeneration without the need for elevated temperatures, thereby minimizing equipment modifications and safety concerns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional high temperature regeneration methods are used, then carbon deposits are removed effectively, but safety risks and equipment cost increase due to high oxygen levels and explosion risks
Solution Approach 1:
The patent changes the temperature parameter from conventional high temperature (400-500°C) to low temperature (200-350°C) regeneration, and modifies the atmosphere composition by using nitrogen instead of oxygen, thereby removing carbon deposits effectively while eliminating explosion risks associated with high oxygen levels
Solution Approach 2:
The patent employs an inert nitrogen atmosphere for catalyst regeneration instead of using oxygen-containing atmospheres, which prevents combustion and explosion while still enabling effective removal of carbon deposits through steam treatment at controlled temperatures
2Reliability
If high regeneration temperatures are used, then carbon deposits are removed, but equipment modifications and operational complexity increase
Solution Approach 1:
The patent reduces the regeneration temperature from conventional high temperatures (400-500°C) to low temperatures (200-350°C), which allows the use of existing equipment without expensive modifications while still achieving effective carbon deposit removal and catalyst activity restoration
3Object-affected harmful factors
If steam is used as regeneration agent at low temperature, then safety risks are reduced and equipment modifications minimized, but regeneration effectiveness may be compromised
Solution Approach 1:
The patent uses a composite regeneration approach combining steam and nitrogen atmosphere together, where steam provides the chemical mechanism for carbon deposit removal while nitrogen maintains the safe inert environment, achieving both safety and effectiveness simultaneously
Solution Approach 2:
The patent introduces steam as an intermediary substance that facilitates carbon deposit removal through gasification reactions at low temperatures, enabling effective regeneration without requiring high temperatures or oxygen, thus maintaining both safety and efficiency
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 enhances catalyst regeneration efficiency by removing carbon deposits and preventing para-formaldehyde formation, achieving comparable results to higher temperature regeneration processes while operating at lower temperatures, thus reducing process downtime and safety risks.
Implementation Method 1
contacting the deactivated vanadium-titanium-phosphorous catalyst with a regeneration stream comprising steam as a regeneration agent
Implementation Method 2
it is believed that the steam present during regeneration assists in the removal of any carbon deposited on the surface of the catalyst and/or there may be some reforming of carbon organics present
Implementation Method 3
the oxygen in the regeneration stream enhances the steam reforming
Data Source
AI summary
A process for regenerating a deactivated vanadium-titanium-phosphorous catalyst which has been used in the production of unsaturated carboxylic acid is disclosed. The process comprises contacting the deactivated vanadium-titanium-phosphorous catalyst with a regeneration stream comprising steam as a regeneration agent at a temperature which is the same or similar to that used in the production of the unsaturated carboxylic acid.