Catalyst Loading Vessel Fluidization Mixing
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Solution Overview
Problem
Current methods for loading catalysts into reactors are costly due to the use of expensive wax encapsulation and result in catalyst loss and degradation, as well as personnel exposure and attrition issues.
Innovation Solution
A system and method for loading catalysts using a vessel with a gas distribution nozzle and top fluid distributor, which introduces a base fluid to mix with the catalyst, minimizing mechanical devices and optimizing catalyst transfer to reduce attrition and loss, featuring a loading hopper with pressurization and fluidization to ensure uniform mixing and efficient transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wax encapsulation is used to load catalyst into reactors, then catalyst protection and handling are improved, but cost increases significantly due to expensive wax material and additional transportation costs
Solution Approach 1:
The invention extracts and eliminates the wax encapsulation step from the catalyst loading process. Instead of enclosing catalyst in wax, the system uses direct fluidization and suspension in process liquid, removing the expensive wax material and associated transportation costs while maintaining catalyst protection through gentle fluid handling
Solution Approach 2:
The invention introduces a liquid mediator (process liquid or slurry medium) to replace wax as the catalyst carrier. This liquid intermediary allows catalyst to be transported and handled in suspension form, achieving the same protective and handling functions as wax encapsulation but without the associated costs
2Productivity
If mechanical devices like pumps and mechanical stirring are used for catalyst mixing and transfer, then mixing efficiency is improved, but catalyst attrition and degradation increase
Solution Approach 1:
The invention replaces mechanical mixing devices (pumps, stirrers) with a fluidization-based mixing system. Gas or liquid flow through the catalyst bed creates natural convection and particle suspension, achieving thorough mixing without mechanical contact that would cause attrition and degradation
Solution Approach 2:
The invention uses pneumatic (gas flow) or hydraulic (liquid flow) forces to fluidize and mix the catalyst particles. The flowing fluid creates uniform particle suspension and distribution through hydrodynamic forces, eliminating the need for mechanical agitation while preventing catalyst damage
3Speed
If catalyst is loaded without fluidization and wetting, then loading speed is improved, but catalyst loss through process vents increases
Solution Approach 1:
The invention performs preliminary wetting and fluidization of catalyst particles before loading into the reactor. This pre-treatment coats particles with liquid, increases their weight, and prevents them from being carried away by gas flows through process vents, while maintaining efficient loading rates
Solution Approach 2:
The invention changes the physical state and properties of catalyst particles by wetting them with liquid. This parameter change (from dry to wet particles) increases particle mass and reduces susceptibility to gas entrainment, preventing catalyst loss through vents while maintaining loading 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 approach reduces catalyst loss and degradation, minimizes personnel exposure, and provides efficient and uniform mixing, eliminating the need for mechanical devices like pumps and stirring, thereby reducing operational downtime and costs.
Implementation Method 1
at least one gas distribution nozzle at or near the bottom of the vessel
Implementation Method 2
a top fluid distributor located at or near the top of the vessel
Data Source
AI summary
A catalyst loading system comprising: a vessel comprising at least one gas distribution nozzle at or near the bottom of the vessel, a top fluid distributor located at or near the top of the vessel, a catalyst inlet through which catalyst is introduced into the vessel, a first contact point at which catalyst introduced into the vessel first contacts the contents of the vessel, and a discharge outlet whereby catalyst exits the vessel. Methods of preparing catalyst slurry for introduction into a downstream reactor or in-situ activation within the vessel utilizing the catalyst loading system are also disclosed.