Fast Fluidization Catalytic Cracking for Light Olefins
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Solution Overview
Problem
Current methods for producing light olefins, such as steam cracking and Fluid Catalytic Cracking (FCC), face challenges in controlling composition and require high energy, with existing catalytic cracking processes not efficiently utilizing reaction conditions for high conversion rates and selectivity of ethylene and propylene from naphtha or kerosene feedstocks.
Innovation Solution
A catalytic cracking process that maintains the riser flow regime as a fast fluidization regime by controlling gas flow velocity and catalyst supply velocity, maximizing the volume fraction of catalyst to enhance the selective production of light olefins like ethylene and propylene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If steam cracking is used to produce light olefins at high temperature (800-900°C), then high conversion rates are achieved, but a lot of heat energy is required and composition control is difficult
Solution Approach 1:
The patent changes the temperature parameter from conventional steam cracking (800-900°C) to catalytic cracking (500-750°C), and introduces catalyst concentration as a new control parameter to achieve high conversion rates with lower energy consumption and better composition control
2Productivity
If FCC is used to produce light olefins as a by-product, then gasoline production is optimized, but light olefin yield is limited
Solution Approach 1:
The patent changes the product distribution parameters by optimizing catalyst composition (HZSM-5 content: 30-70 wt%) and reaction conditions to shift the product spectrum toward higher light olefin yields while maintaining reasonable gasoline production
Solution Approach 2:
The patent uses composite catalysts combining HZSM-5 zeolite with other materials to achieve synergistic effects that simultaneously enhance both gasoline quality and light olefin yield, resolving the trade-off between the two products
3Ease of operation
If dilute pneumatic conveying regime is used in the riser, then conventional operation is maintained, but catalyst volume fraction is low and light olefin production efficiency is reduced
Solution Approach 1:
The patent dynamically adjusts the gas velocity and catalyst circulation rate to transition from dilute pneumatic conveying to fast fluidization regime, optimizing the catalyst volume fraction in the riser to enhance light olefin production efficiency
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 conversion rates and high selectivity of light olefins, specifically ethylene and propylene, by optimizing the flow regime and catalyst distribution within the riser, thereby improving the efficiency of the catalytic cracking process.
Implementation Method 1
a catalyst in the form of fine particles which behave like fluid when being aerated using steam
Implementation Method 2
the flow regime of a riser is maintained as a fast fluidization regime instead of a conventional dilute pneumatic conveying regime
Implementation Method 3
catalytic cracking process for the production of light olefins from a hydrocarbon feedstock
Data Source
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AI summary
Disclosed is a catalytic cracking process for the production of light olefins from a hydrocarbon feedstock using fast fluidization, which is a preferred process for more efficiently increasing the production of light olefin hydrocarbons. According to this invention, a fast fluidization regime is applied to a fluidized bed catalytic cracking process of producing light olefins using zeolite, such that a volume fraction and distribution of the catalyst sufficient to induce the catalytic cracking reaction can be provided, thus effectively enhancing the production of light olefin hydrocarbons, in particular, ethylene and propylene, at high selectivity.