Silica Particle Fluidization Aid for Reactor Erosion and Catalyst Loss
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Solution Overview
Problem
Conventional fluid bed reactors face high catalyst loss and reactor erosion due to the use of dense, hard alumina particles as fluidization aids, leading to inefficient processes and premature reactor failure.
Innovation Solution
Incorporating silica particles with specific properties, such as median particle diameters ranging from 10 microns to 500 microns, densities between 1.8 g/cm3 and 2.8 g/cm3, and sphericity between 60% and 99.9%, as an inert additive composition in the fluid bed reactor to reduce catalyst loss and reactor erosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If alumina particles are used as fluidization aid, then catalyst loss is reduced, but reactor erosion increases
Solution Approach 1:
The patent changes the physical parameters of the fluidization aid by using silica particles with specific properties: lower density (1.8-2.8 g/cm³ compared to alumina's higher density), controlled particle size (10-500 microns), and specific morphology. These parameter changes reduce the harmful erosion effect on the reactor while maintaining the fluidization function and catalyst protection capability.
Solution Approach 2:
The patent uses silica particles as a consumable fluidization aid that can be continuously added to the system. These particles serve as a sacrificial material that protects the catalyst and reactor by absorbing the mechanical stress and erosion, allowing continuous operation without frequent reactor maintenance.
2Productivity
If dense, hard alumina particles are used as fluidization aid, then fluidization efficiency is improved, but reactor reliability decreases
Solution Approach 1:
The patent optimizes the physical parameters of silica particles including density (1.8-2.8 g/cm³), particle size distribution (10-500 microns), and hardness to achieve optimal fluidization efficiency. These parameter changes maintain good fluidization performance while reducing the damaging effects on reactor reliability.
Solution Approach 2:
Silica particles act as an intermediary material between the gaseous reactant stream and the catalyst bed, providing the necessary fluidization function while protecting the reactor walls from direct contact with harsh process conditions and high-velocity gas flows that cause erosion.
3Object-affected harmful factors
If silica particles with specific properties are used as fluidization aid, then reactor erosion is reduced, but catalyst loss increases
Solution Approach 1:
The patent carefully adjusts the parameters of silica particles including particle size (10-500 microns), density (1.8-2.8 g/cm³), and composition (90-99.9% silica) to achieve an optimal balance. These parameter changes reduce reactor erosion while minimizing catalyst loss through proper fluidization control and particle size selection that prevents excessive catalyst entrainment.
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 use of silica particles significantly reduces catalyst consumption and reactor erosion by up to 30% and 70% respectively, while improving product yield by up to 0.2% compared to processes using alumina as fluidization aids.
Implementation Method 1
the fluid bed comprises a catalyst composition comprising a catalyst and an inert additive composition comprising from 0.5 wt % to 30 wt % of silica particles
Implementation Method 2
Conventional fluidization aids used in fluid bed reactors, however, are more dense, harder, and are more roughly shaped than the catalyst which results in increased erosion of the reactor
Data Source
AI summary
The present disclosure relates to fluid bed processes that utilize silica particles as a fluidization aid. The process comprises reacting one or more reactants in a reactor comprising a fluid bed to form a product. The fluid bed comprises a catalyst composition comprising a catalyst and an inert additive composition comprising silica particles from 0.5 wt % to 30 wt %, based on the total weight of the catalyst composition. The silica particles are discrete, inert particles that are mixed with the catalyst in the fluid bed.