Fluid Catalytic Cracked Oil Fraction Processing for Clean Fuel and Aromatics
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Solution Overview
Problem
Current methods for producing petrochemical products from fluid catalytic cracked oil fractions are limited in producing low-pollution petroleum products like LPG and aromatics, and face challenges in efficiency, hydrogen consumption, and adaptability to varying product standards.
Innovation Solution
A method involving distillation, hydrodesulfurization/hydrodenitrogenation, and hydrocracking/dealkylation processes to separate and convert fluid catalytic cracked oil fractions into LPG, low-sulfur gas oil, and aromatics, with the option to recycle fuel gas for hydrogen production and utilize C4 hydrocarbons in an alkylation unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If catalytic reforming is applied to fluid catalytic cracked gasoline, then aromatics can be produced, but LPG and low-sulfur gas oil cannot be produced and the method is limited to middle boiling point gasoline fraction
Solution Approach 1:
The patent divides the fluid catalytic cracked oil fraction into multiple boiling point fractions through distillation (gas oil fraction and gasoline fraction), then applies different processing methods to each fraction. This segmentation allows simultaneous production of aromatics from gasoline fraction and low-sulfur gas oil from gas oil fraction, resolving the limitation of single-process methods
Solution Approach 2:
The patent creates a multi-functional processing system where the same feedstock (fluid catalytic cracked oil fraction) can be processed through different pathways (catalytic reforming for aromatics, hydrodesulfurization for low-sulfur gas oil, hydrocracking for LPG) depending on product demand, making the system adaptable to various product requirements
2Productivity
If hydrodesulfurization is applied to fluid catalytic cracked gas oil, then low-sulfur gas oil can be produced, but LPG and aromatics cannot be produced
Solution Approach 1:
The patent segments the gas oil fraction from the gasoline fraction through distillation, allowing the gas oil fraction to undergo hydrodesulfurization for low-sulfur gas oil production while the gasoline fraction can be processed separately for aromatics and LPG production
Solution Approach 2:
The patent implements a dynamic processing system where the processing pathway can be adjusted based on product demand. The system can shift between producing low-sulfur gas oil, aromatics, or LPG by controlling the processing conditions and feedstock selection, making it adaptable to varying market requirements
3Productivity
If hydrocracking is applied to fluid catalytic cracked gas oil, then low-sulfur gas oil and LPG can be produced, but severe operation conditions make it difficult to control and adapt to stepwise enhancement of gas oil products
Solution Approach 1:
The patent segments the processing into separate units (distillation unit, hydrodesulfurization unit, hydrocracking unit) with independent control parameters. This allows each unit to be optimized and controlled separately, making the overall system easier to operate and adapt to varying product requirements without the severe condition control problems of integrated hydrocracking
4Productivity
If hydrocracking is applied to produce naphtha, then demand for naphtha can be met, but hydrogen consumption is much greater compared to hydrodesulfurization
Solution Approach 1:
The patent segments the processing pathway so that hydrodesulfurization (lower hydrogen consumption) is applied to the gas oil fraction while hydrocracking (higher hydrogen consumption but producing valuable LPG and aromatics) is applied to the gasoline fraction. This segmentation allows optimization of hydrogen usage based on product priorities
Solution Approach 2:
The patent changes the processing parameters and feedstock selection to optimize hydrogen consumption. By controlling the severity of hydrocracking conditions and selecting appropriate feedstock compositions, the system can reduce hydrogen consumption while still meeting naphtha and LPG production demands
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
Efficient production of LPG, low-sulfur gas oil, and aromatics with adjustable yields, improved fluid catalytic cracking efficiency, and optimized hydrogen use, reducing pollution and operational complexity.
Implementation Method 1
distilling a fluid catalytic cracked oil fraction, thus separating the fluid catalytic cracked oil fraction into effluent oil and residual oil
Implementation Method 2
subjecting the effluent oil obtained in (a) to hydrodesulfurization/hydrodenitrogenation, thus removing sulfur and nitrogen compounds from the effluent oil
Implementation Method 3
subjecting a non-aromatic hydrocarbon compound therein to hydrocracking, thus converting the non-aromatic hydrocarbon compound into an LPG-enriched non-aromatic hydrocarbon mixture
Data Source
AI summary
This invention relates to a petroleum refining method for producing high value-added clean petroleum products and aromatics (Benzene/Toluene/Xylene) together, by which low pollution petroleum products including liquefied petroleum gas or low-sulfur gas oil and aromatics can be efficiently produced together from a fluid catalytic cracked oil fraction.