Hydrocracking Aromatic Complex Bottoms for Gasoline Yield
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Solution Overview
Problem
The aromatic complex bottoms from catalytic reforming processes are not efficiently utilized, as they deteriorate gasoline quality and are often considered process reject material, posing a challenge in refining operations.
Innovation Solution
The process involves reacting C9+ aromatic complex bottoms in the presence of hydrogenation and hydrocracking catalysts under specified conditions to produce a hydrogenated and hydrocracked effluent, which is then further processed using fluidized catalytic cracking to generate FCC naphtha, light olefins, and cycle oil, allowing for the separation of valuable gasoline blending components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If aromatic complex bottoms are directly blended into gasoline, then gasoline volume is increased, but gasoline quality deteriorates due to high aromatic content and heavy boiling point range
Solution Approach 1:
The patent applies parameter changes by subjecting aromatic complex bottoms to hydrogenation and hydrocracking reactions that fundamentally alter the chemical composition and physical properties of the feedstock. The hydrogenation reduces aromatic content by converting aromatics to naphthenes and paraffins, while hydrocracking breaks heavy molecules into lighter gasoline-range hydrocarbons. These parameter changes transform the harmful high-aromatic, heavy-boiling feedstock into quality gasoline blending components with appropriate aromatic content and boiling point distribution.
Solution Approach 2:
The patent converts the harmful characteristics of aromatic complex bottoms into beneficial properties through catalytic processing. The high aromatic content, which initially deteriorates gasoline quality, becomes a valuable feedstock for hydrogenation reactions that produce high-octane gasoline components. The heavy molecular weight, which causes poor volatility, is converted through hydrocracking into lighter hydrocarbons with optimal boiling points for gasoline blending. Thus, the harmful feedstock is transformed into a beneficial product.
2Object-affected harmful factors
If aromatic complex bottoms are rejected as process waste, then gasoline quality is maintained, but valuable hydrocarbon resources are lost
Solution Approach 1:
Instead of discarding aromatic complex bottoms as waste, the patent recovers valuable hydrocarbon resources through integrated hydrogenation and hydrocracking processing. The process retrieves useful gasoline-range hydrocarbons and high-octane blending components from what would otherwise be rejected material. The aromatic complex bottoms are processed through catalytic reactors to recover valuable products including gasoline blending components, olefins, and other hydrocarbon products, thereby preventing resource loss while maintaining product quality.
Solution Approach 2:
The patent赋予 aromatic complex bottoms multiple functions and uses. Rather than being solely waste material, the feedstock serves as a valuable source of hydrocarbons that can be converted into various useful products including gasoline blending components, olefin feedstocks, and chemical intermediates. The integrated processing system enables the same feedstock to fulfill multiple functional roles, maximizing resource utilization and minimizing waste.
3Object-affected harmful factors
If conventional hydrogenation conditions are used for aromatic complex bottoms, then aromatic content is reduced, but heavy alkylated aromatics remain unconverted due to insufficient reaction severity
Solution Approach 1:
The patent employs composite catalytic systems that combine multiple functional catalysts to achieve both aromatic hydrogenation and hydrocracking of heavy alkylated aromatics. The composite catalyst system typically includes metal functions for hydrogenation (such as Ni, Mo, or Pt) combined with acidic functions for cracking (such as zeolites or alumina). This composite approach enables simultaneous reduction of aromatic content and breakdown of heavy molecules, overcoming the limitations of conventional single-function catalysts and achieving high conversion efficiency.
Solution Approach 2:
The patent applies preliminary hydrogenation action to aromatic complex bottoms before final gasoline blending. The hydrogenation step pre-treats the heavy aromatic feedstock by reducing aromatic content and saturating alkyl chains, making the subsequent hydrocracking more effective. This preliminary action prepares the feedstock for more efficient conversion by reducing the stability of aromatic rings and facilitating C-C bond cleavage in the hydrocracking stage, thereby improving overall productivity.
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 effectively converts the heavy aromatic complex bottoms into valuable gasoline blending components and petrochemical products, improving the quality and yield of gasoline and reducing the amount of process reject material.
Implementation Method 1
reacting C9+ aromatic complex bottoms in the presence of hydrogenation and hydrocracking catalysts under specified conditions to produce a hydrogenated and hydrocracked effluent
Implementation Method 2
reacting C9+ aromatic complex bottoms in the presence of hydrogenation and hydrocracking catalysts under specified conditions to produce a hydrogenated and hydrocracked effluent
Implementation Method 3
the effluent is then further processed using fluidized catalytic cracking to generate FCC naphtha, light olefins, and cycle oil
Data Source
AI summary
Processes and systems are disclosed for improving the yield from reforming processes. Aromatic complex bottoms, or a heavy fraction thereof, are subjected to hydrogenation/hydrocracking, followed by catalytic conversion, to produce additional gasoline and higher-quality aromatic compounds.