Trickle Bed Reactor Pressure Control for FCC Catalyst Simulation
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Solution Overview
Problem
Current laboratory methods for simulating industrial-scale fluidized bed reactors, such as those used in FCC processes, face challenges in replicating the contact times and operational parameters of industrial-scale plants, leading to inefficiencies in catalyst testing and development due to the need for larger pilot plants and complex operations.
Innovation Solution
An apparatus and method utilizing a trickle bed reactor with a pressure control system that allows for controlled catalyst transfer and residence times between 0.1-10 seconds, enabling precise simulation of industrial-scale conditions with reduced catalyst volumes and apparatus complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If laboratory reactors are used to simulate industrial FCC processes, then catalyst testing can be performed with smaller catalyst volumes (1-50 grams), but the contact time between catalyst and reactants becomes too long (flow rate 0.5-1 m/s vs. industrial 10-20 m/s) leading to inaccurate simulation of industrial conditions
Solution Approach 1:
The patent applies dynamics by making the catalyst bed movable rather than static. The catalyst is continuously circulated through the reactor system, creating a dynamic fluidized bed that better simulates the high-velocity catalyst flow in industrial FCC riser reactors. This dynamic approach allows accurate simulation of industrial contact times (0.1-10 seconds) while using small catalyst volumes (1-50 grams) in the laboratory reactor.
2Measurement precision
If pilot plants with larger catalyst volumes (2-10 kilograms) are used to achieve accurate simulation of industrial FCC processes, then operating parameters match industrial conditions better, but the device complexity and operational complexity increase significantly
Solution Approach 1:
The patent creates a simplified copy of the industrial FCC process by using a laboratory-scale reactor that replicates the essential hydrodynamics and mass transfer characteristics of industrial riser reactors. Instead of building a full-scale pilot plant with kilograms of catalyst, the invention uses a scaled-down model (grams of catalyst) that copies the key flow patterns and residence time distributions, achieving accurate parameter matching with much reduced complexity.
Solution Approach 2:
The patent achieves accurate simulation of industrial operating parameters by carefully controlling and adjusting key parameters in the laboratory reactor, including catalyst circulation rate, reactant flow rate, temperature, and pressure. By optimizing these parameters, the system replicates industrial FCC conditions (contact times 0.1-10 seconds, catalyst-to-oil ratios, temperatures) in a compact laboratory apparatus without requiring pilot-plant scale equipment.
3Ease of operation
If static fluidized beds are used for catalyst testing, then the apparatus is simpler to operate, but the contact time between catalyst and reactants is insufficient to accurately represent industrial riser reactor conditions
Solution Approach 1:
The patent transitions from static to dynamic fluidized bed operation, where catalyst is continuously circulated through the reactor rather than remaining stationary. This dynamic fluidization creates the short contact times (0.1-10 seconds) characteristic of industrial riser reactors, while maintaining ease of operation through automated catalyst circulation systems and simple reactor design.
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 improved analysis of FCC catalysts with enhanced accuracy in replicating industrial-scale processes, reducing development time and costs by enabling efficient testing with smaller catalyst volumes and more precise control over operational parameters.
Implementation Method 1
controlling the backpressure by means of a continuously acting valve... during the leading-off of feed, carrier gas and products from the exit conduit connected to the separator (3)
Implementation Method 2
catalytically converting chemical substances in the presence of pulverulent catalysts with residence times in the range of 0.1-10 seconds
Implementation Method 3
supplying the catalyst in a controlled manner from the at least one catalyst reservoir vessel (1) to the inlet of a trickle bed reactor (2), wherein at least the catalyst is supplied in the presence of carrier gas
Implementation Method 4
transferred the mixture of catalyst, feed, carrier gas and products formed in the reaction space of the trickle bed reactor (2) into a separator (3), wherein the catalyst is separated from the product stream
Data Source
AI summary
Disclosed herein is an apparatus and a method for catalytic conversion of chemical substances in the presence of pulverulent catalysts in a trickle bed reactor with residence times in the range of 0.1-10 seconds, wherein the apparatus includes a trickle bed reactor (2), the inlet side of which is functionally connected to a catalyst reservoir vessel (1) and a reactant feed, and the outlet side of which is functionally connected to a separator (3). The separator (3) has an exit conduit for leading off product stream, wherein the apparatus has the characteristic feature that the exit conduit disposed on the separator (3) for leading off product stream has a continuously acting valve connected via a controller to a pressure measurement sensor, wherein the continuously acting valve and the pressure measurement sensor form a pressure control circuit with a controller.