Fluidized Bed Reactor Catalyst Velocity Control
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Solution Overview
Problem
In fluidized bed reactors, catalysts with low abrasion resistance lead to reduced reaction yield due to catalyst loss, while high abrasion resistance catalysts cause reactor damage, and adjusting gas linear velocities to prevent damage reduces reaction efficiency.
Innovation Solution
Adjusting the linear velocity of starting material gases in relation to the catalyst's abrasion resistance within specific conditions to maintain reactor integrity and optimize reaction yield, while ensuring the catalyst's hollow particle ratio is below 25% to enhance abrasion resistance and fluidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a catalyst with high abrasion resistance is used, then catalyst loss is reduced, but reactor damage occurs due to strong collisions with the reactor interior
Solution Approach 1:
The patent applies parameter changes by precisely controlling the linear velocity of starting material gas within a specific range (0.3-1.5 m/sec) based on catalyst abrasion resistance values. This parameter optimization allows the system to maintain catalyst retention while preventing reactor damage, resolving the contradiction between these two opposing requirements
Solution Approach 2:
The patent implements dynamics by making the gas linear velocity adjustable and dependent on the catalyst's abrasion resistance characteristics. The system dynamically adapts the operating conditions to the specific catalyst properties, enabling optimal balance between catalyst retention and reactor protection under varying conditions
2Object-affected harmful factors
If the linear velocity of starting material gas is decreased to prevent reactor damage, then reactor integrity is maintained, but reaction yield decreases due to reduced catalyst fluidity
Solution Approach 1:
The patent resolves this contradiction through parameter changes by establishing an optimal linear velocity range (0.3-1.5 m/sec) that simultaneously maintains reactor integrity and ensures sufficient catalyst fluidity for high reaction yield. This precise parameter control prevents both reactor damage and productivity loss
3Productivity
If the linear velocity of starting material gas is increased to improve catalyst fluidity and reaction yield, then reaction efficiency increases, but reactor damage occurs due to stronger catalyst collisions
Solution Approach 1:
The patent applies parameter changes by controlling the linear velocity within a specific upper limit (0.3-1.5 m/sec) that maximizes reaction yield while preventing catalyst collisions from damaging the reactor. This parameter optimization resolves the contradiction between productivity and reactor integrity
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 allows for high-yield production of unsaturated nitriles without reactor damage, balancing catalyst retention and reaction efficiency by controlling gas velocities and catalyst properties.
Implementation Method 1
a reaction step of subjecting the hydrocarbon to a vapor phase catalytic ammoxidation reaction in the presence of the catalyst in the internal space to produce the corresponding unsaturated nitrile
Implementation Method 2
a linear velocity (m/sec) of the starting material gas at the first feed port is adjusted against a degree of abrasion resistance (%) of the catalyst
Data Source
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AI summary
A process for producing a compound by use of a fluidized bed reactor comprising an internal space having a catalyst housed in a fluidizable manner therein, a first feed port into which a starting material gas comprising a hydrocarbon is fed to the fluidized bed reactor, a second feed port into which an oxygen-containing gas comprising oxygen is fed to the fluidized bed reactor, and a discharge port into which a reaction product gas is discharged from the fluidized bed reactor, including a reaction step of subjecting the hydrocarbon to a vapor phase catalytic oxidation reaction or a vapor phase catalytic ammoxidation reaction in the presence of the catalyst in the internal space to produce the corresponding unsaturated acid or unsaturated nitrile, respectively, wherein in the reaction step, a linear velocity (m/sec) of the starting material gas at the first feed port is adjusted against a degree of abrasion resistance (%) of the catalyst so as to satisfy a prescribed relation between them.