Electrified Fluidized Bed Reactor for Alcohol-to-Olefin Conversion
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Solution Overview
Problem
Existing fluidized bed reactors for converting alcohols into olefins rely on external heating devices, contributing to greenhouse gas emissions and hindering the transition to decarbonized energy sources.
Innovation Solution
A process utilizing a fluidized bed reactor with electrically conductive particles and solid acid catalysts, where at least 10% of the particles are electrically conductive with resistivity between 0.001 Ohm·cm to 500 Ohm·cm, heats the reactor by passing an electric current, eliminating the need for external heating devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If external heating devices are used to heat the fluidized bed reactor, then the required temperature for catalytic dehydration is achieved, but greenhouse gas emissions increase and carbon neutrality goals are hindered
Solution Approach 1:
The patent replaces the mechanical/thermal heating system (external heating devices, burners, ovens) with an electrical heating system. Electric current is passed through electrically conductive particles in the fluidized bed, generating heat through Joule heating. This substitution eliminates the need for fossil fuel-based external heating devices, thereby reducing greenhouse gas emissions while maintaining the required reaction temperature of 200-500°C for catalytic dehydration of alcohols into olefins.
Solution Approach 2:
The patent changes the heating method parameter from external thermal heating to internal electrical heating. By introducing electrically conductive particles (such as graphite, silicon carbide, or metal particles) into the fluidized bed and passing electric current through them, the system transforms the heating mechanism. The electrically conductive particles have resistivity ranging from 0.001 to 500 Ohm·cm at 400°C, enabling efficient Joule heating when voltage is applied, thus achieving the required temperature without external heating devices.
2Temperature
If external heating devices are used, then the reaction temperature is maintained, but heat loss to the environment increases
Solution Approach 1:
The patent replaces external thermal heating with internal electrical heating through Joule heating of conductive particles. This internal heating mechanism generates heat directly within the reaction medium, reducing the temperature gradient between the heat source and the reaction zone. Consequently, heat loss to the environment is minimized compared to external heating devices that must transfer heat through reactor walls and fluidized bed material.
Solution Approach 2:
The electrically conductive particles in the fluidized bed serve dual functions: they act as heat transfer media and simultaneously generate heat through Joule heating when electric current passes through them. This self-heating capability eliminates the need for separate external heating devices and reduces energy loss, as the system generates its own heat internally rather than relying on external heat transfer.
3Object-generated harmful factors
If electrically conductive particles are added to the fluidized bed, then external heating devices can be eliminated, but the particle composition and reactor design become more complex
Solution Approach 1:
The electrically conductive particles introduced into the fluidized bed serve multiple functions simultaneously: (1) they act as heat transfer media for temperature control, (2) they generate heat through Joule heating when electric current passes through them, and (3) they can serve as catalyst supports or active catalytic materials. This multi-functionality reduces the need for separate heating devices and simplifies the overall system design despite the added complexity of electrical components.
Solution Approach 2:
The patent employs composite particle systems combining electrically conductive materials (such as graphite, silicon carbide, or metal particles) with catalytic materials. These composite particles integrate the electrical conductivity needed for Joule heating with the catalytic activity required for alcohol dehydration. The composite structure allows simultaneous achievement of heating and catalysis functions, reducing system complexity compared to separate heating and catalytic systems.
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 maintains the required temperature for catalytic dehydration of alcohols into olefins without external heating, minimizing heat loss and reducing carbon emissions, thereby promoting a more sustainable chemical production process.
Implementation Method 1
heating the fluidized bed is performed by passing an electric current through the fluidized bed
Implementation Method 2
catalytic dehydration of alcohols having at least two carbon atoms into corresponding olefins
Data Source
AI summary
The disclosure concerns a process to perform a catalytic dehydration of alcohols having at least two carbon atoms into olefins, said process comprising the steps of a) providing one fluidized bed reactor and a bed comprising particles; b) putting the particles in a fluidized state to obtain a fluidized bed; c) heating the fluidized bed to a temperature ranging from 200° C. to 500° C.; remarkable in that the particles of the bed comprise electrically conductive particles and particles of one or more solid acid catalysts, wherein 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 400° C.; and in that the step c) of heating the fluidized bed is performed by passing an electric current through the fluidized bed.