Slurry Oil Partial Upgrading via Fixed Bed Catalyst
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Solution Overview
Problem
Slurry oil from fluid catalytic cracking units is of low value due to its high polyaromatic content, making it less acceptable for fuel, and there is a need to separate one-ring aromatics and saturates from polyaromatics to produce a higher-value light oil stream.
Innovation Solution
The process involves flowing slurry oil over a fixed bed catalyst, primarily a non-metal catalyst such as zeolite, to produce a processed slurry oil, which is then separated by boiling point to isolate a light oil stream, enhancing the separation of lower boiling components and increasing the quality of coke yield at a refinery coker unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If slurry oil is used directly as fuel, then it can be utilized without additional processing, but its low value and high polyaromatic content make it less acceptable in fuel oils
Solution Approach 1:
The patent extracts polyaromatic compounds from slurry oil through selective catalytic cracking using a fixed bed catalyst. The catalyst selectively cracks polyaromatics into lighter, more valuable components while leaving one-ring aromatics and saturates relatively intact, thereby removing the harmful high polyaromatic content and improving fuel acceptability
Solution Approach 2:
The patent changes the chemical structure parameters of slurry oil by controlling catalytic cracking conditions (temperature, pressure, catalyst type). By optimizing these parameters, polyaromatic compounds are converted into desirable fuel components, transforming the quality composition to meet fuel specifications
2Reliability
If slurry oil undergoes complete upgrading to remove all polyaromatics, then fuel quality improves, but processing complexity and cost increase
Solution Approach 1:
The patent applies partial action by performing selective rather than complete cracking. The fixed bed catalyst is designed to selectively crack only the problematic polyaromatic portion of slurry oil, leaving the valuable one-ring aromatics and saturates intact. This partial upgrading achieves sufficient fuel quality improvement without requiring complex multi-stage processing
Solution Approach 2:
The patent introduces a fixed bed catalyst as an intermediary substance that mediates the selective cracking process. The catalyst acts as a selective agent that distinguishes between polyaromatics (to be cracked) and other components (to be preserved), simplifying the overall processing complexity while achieving quality improvement
3Manufacturing precision
If slurry oil is separated by boiling point without prior catalytic treatment, then separation is straightforward, but the light oil stream contains unwanted polyaromatics and one-ring aromatics are not effectively separated
Solution Approach 1:
The patent performs preliminary catalytic cracking treatment on slurry oil before boiling point separation. This preliminary action modifies the molecular weight distribution and volatility characteristics of polyaromatics, enabling more effective separation during subsequent distillation and improving the precision of component separation
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 process effectively separates high-value one-ring aromatics and saturates from polyaromatics, resulting in a light oil stream with improved boiling point separation and increased coke quality, thereby upgrading the slurry oil's value.
Implementation Method 1
The slurry oil is then flowed over a fixed bed catalyst, consisting essentially of a non-metal catalyst, to produce a processed slurry oil
Implementation Method 2
The processed slurry oil is then separated by boiling point to separate out the light oil stream
Data Source
AI summary
A process of producing a light oil stream from slurry oils. The process begins by obtaining slurry oil from a fluid catalytic cracking unit. The slurry oil is then flowed over a fixed bed catalyst, consisting essentially of a non-metal catalyst, to produce a processed slurry oil. The processed slurry oil is then separated by boiling point to separate out the light oil stream.