Inductive Catalytic Cracking of Crude Oil With Low Coke Yield
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Solution Overview
Problem
Existing methods for directly converting crude oil into petrochemical products are energy-intensive and generate significant greenhouse gas emissions, with limited product flexibility and high coil coking issues.
Innovation Solution
A two-stage process utilizing inductive heating with a susceptor material in a reactive distillation unit and catalytic cracking reactor to convert crude oil into petrochemical products, reducing the need for burning hydrocarbons to generate heat and minimizing greenhouse gas emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If steam cracking is used to convert crude oil to petrochemical products, then high temperature processing achieves good conversion, but energy consumption increases and greenhouse gas emissions are generated
Solution Approach 1:
The patent replaces the conventional steam cracking thermal process with a catalytic cracking process that operates at lower temperatures (300-800°C). The catalytic reactor uses solid acid catalysts to facilitate the cracking reactions, substituting the high-temperature thermal mechanism with a catalytic mechanism that achieves similar conversion at reduced energy input.
Solution Approach 2:
The patent changes the operating parameters by reducing the processing temperature from typical steam cracking temperatures (>800°C) to catalytic cracking temperatures (300-800°C). This parameter change is enabled by the introduction of catalysts, which lower the activation energy required for cracking reactions, thereby reducing energy consumption while maintaining productivity.
2Productivity
If traditional steam cracking is used, then petrochemical products are produced, but coil coking limits product flexibility and requires frequent maintenance
Solution Approach 1:
The patent replaces the steam cracking process with catalytic cracking, using solid acid catalysts in a fixed bed or fluidized bed reactor. This substitution eliminates the coil coking problem inherent in steam cracking because the catalytic mechanism proceeds through different reaction pathways that do not produce the same extent of coke deposition on heat transfer surfaces.
Solution Approach 2:
The patent introduces catalysts as intermediary substances that mediate the cracking reactions. These catalysts provide alternative reaction pathways that reduce the formation of coke and other unwanted byproducts. The catalysts can be regenerated in situ, maintaining continuous operation without the frequent shutdowns required for coil decoking in steam cracking.
3Adaptability or versatility
If crude oil is directly converted to petrochemical products, then product flexibility improves, but the process requires substantial energy input
Solution Approach 1:
The patent changes the energy input parameter by using catalytic cracking at lower temperatures (300-800°C) compared to steam cracking (>800°C). The catalysts enable the reactions to proceed at reduced temperatures, directly reducing the energy input required while maintaining the ability to produce various petrochemical products by adjusting operating conditions and catalyst types.
Solution Approach 2:
The patent applies different catalysts in different zones or at different stages of the cracking process to optimize product selectivity. By using catalysts with different properties (e.g., zeolites with different pore structures, different acid strengths) in specific locations, the process can be tuned to produce different product distributions from the same crude oil feed, achieving product flexibility without increasing energy input.
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
The process efficiently produces light olefins and BTX compounds with low coke yield and reduced energy consumption, offering a more sustainable and cost-effective method for petrochemical production.
Implementation Method 1
the catalytic cracking reactor includes a cracking catalyst and a susceptor material dispersed throughout the catalytic cracking reactor and the catalytic cracking reactor operates at a temperature of 300°C to 800°C with heating from magnetic induction of the susceptor material
Implementation Method 2
introducing a crude oil stream to a reactive distillation unit to remove conradson carbon and metals from the crude oil stream and generate a distillate stream having a mean boiling point distribution less than the crude oil stream
Data Source
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AI summary
Methods for processing a crude oil feedstock include introducing a crude oil stream to a reactive distillation unit to remove conradson carbon and metals from the crude oil stream and generate a distillate stream having a mean boiling point distribution less than the crude oil stream and passing the distillate stream in a gaseous form in a continuous manner and without further processing to a catalytic cracking reactor that cracks the distillate stream to form a petrochemical product stream including light olefins and BTX. The catalytic cracking reactor includes a cracking catalyst and a susceptor material dispersed throughout the catalytic cracking reactor. Further, the catalytic cracking reactor operates at a temperature of 300°C to 800°C with heating from magnetic induction of the susceptor material.