Electrically Conductive Fluidized Bed for Endothermic Cracking
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Solution Overview
Problem
Current methods for endothermic catalytic cracking in fluidized bed reactors rely on fossil carbon-based fuels for heating, which are environmentally unfriendly and not scalable for large-scale industrial use.
Innovation Solution
A process that uses a fluidized bed reactor with electrically conductive particles and a catalytic composition comprising zeolites, where an electric current is passed through the bed to heat it to 500-850°C for catalytic cracking of hydrocarbons, eliminating the need for external heating devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fossil carbon-based fuels are used for heating in fluidized bed reactors, then high temperatures (500-1000°C) can be achieved for endothermic catalytic cracking, but environmental impact increases and scalability is limited
Solution Approach 1:
The patent replaces the mechanical/chemical heating system (fossil fuel combustion) with an electrical heating system. Electric current is passed through the fluidized bed reactor to generate heat directly within the bed, eliminating the need for external fossil fuel heating devices and thereby reducing environmental impact while maintaining the required high temperatures for endothermic catalytic cracking
Solution Approach 2:
The fluidized bed reactor serves dual functions: it is both the reaction vessel and the heating element. The electrical resistance of the bed material itself generates heat when current passes through it, allowing the system to heat itself without requiring separate external heating devices, thus improving scalability and reducing environmental harm
2Temperature
If external heating devices are used for endothermic catalytic cracking, then high temperatures can be maintained, but device complexity increases and scalability is reduced
Solution Approach 1:
The patent merges the heating function with the reactor vessel by making the fluidized bed itself electrically conductive and using it as the heating element. This integration eliminates the need for separate external heating devices, thereby reducing device complexity while maintaining the ability to achieve and sustain high temperatures for endothermic catalytic cracking
Solution Approach 2:
The fluidized bed material serves multiple functions simultaneously: it acts as the catalyst support, the heating element, and the reaction medium. This multi-functionality is achieved by selecting electrically conductive bed materials that can generate heat through electrical resistance while also supporting the catalytic cracking reaction, thereby simplifying the overall system
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 efficiently performs endothermic catalytic cracking at high temperatures without external heating, reducing environmental impact and enabling large-scale industrial application.
Implementation Method 1
heating the fluidized bed to a temperature ranging from 500°C to 850°C to conduct the endothermic catalytic cracking reaction... the step (c) of heating the fluidized bed is performed by passing an electric current through the fluidized bed
Implementation Method 2
the particles of the bed comprise electrically conductive particles and particles of a catalytic composition... at least 10 wt. % of the particles based on the total weight of the particles of the bed are electrically conductive particles and have a resistivity ranging from 0.001 Ohm.cm to 500 Ohm.cm at 500°C
Data Source
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AI summary
The disclosure relates to a process to perform a catalytic cracking reaction of hydrocarbons having at least four carbons, said process comprising the steps of providing a fluidized bed reactor comprising at least two electrodes and a bed comprising particles, wherein the particles are put in a fluidized state to obtain a fluidized bed; heating said bed to a temperature between 500°C and 850°C by passing an electric current through the fluidized bed to conduct the reaction. The process is remarkable in that the particles of the bed comprise electrically conductive particles and particles of a catalytic composition, wherein at least 10 wt.% of the particles are electrically conductive particles and have a resistivity from 0.001 to 500 Ohm.cm at 500°C and in that the step of heating the fluidized bed is performed by passing an electric current through the fluidized bed.