Heavy Oil Upgrading with Staged Catalysts for Chemical Intermediates
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Solution Overview
Problem
Existing methods struggle to efficiently convert heavy oils, such as crude oil, into valuable chemical intermediates and transportation fuels while reducing aromatic, metal, and nitrogen content effectively.
Innovation Solution
A catalytic treatment process using a series of catalysts, including hydrodemetalization, transition, hydrodenitrogenation, and hydrocracking catalysts, to upgrade heavy oils by removing metals, nitrogen, and aromatics, followed by steam cracking to produce chemical intermediates and fuels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional refining operations are used to convert heavy oils, then the process is simple, but the production of chemical intermediates is insufficient to meet rising demands
Solution Approach 1:
The refining process is divided into multiple specialized catalytic stages: hydrodemetalization catalyst to remove metals, hydrodenitrogenation catalyst to remove nitrogen, and hydrocracking catalysts to reduce aromatic content. Each catalyst performs a specific function in sequence, transforming the heavy oil progressively to meet chemical intermediate production demands.
2Object-affected harmful factors
If heavy oils are processed without specialized catalytic treatment, then the process is simpler, but the aromatic, metal, and nitrogen content remains high
Solution Approach 1:
The process selectively extracts and removes harmful components from heavy oil through dedicated catalytic reactions. The hydrodemetalization catalyst extracts metals, the hydrodenitrogenation catalyst extracts nitrogen, and the hydrocracking catalysts extract aromatic compounds, each targeting specific contaminants to reduce their content to acceptable levels.
3Adaptability or versatility
If a single catalyst is used for heavy oil treatment, then the device complexity is reduced, but the catalytic functionality is insufficient to remove metals, nitrogen, and aromatics effectively
Solution Approach 1:
The patent implements a multi-functional catalytic system where five different catalysts work in sequence, each designed for a specific transformation function. This universal approach handles multiple types of contaminants (metals, sulfur, nitrogen, aromatics) and molecular size variations through a coordinated series of catalytic reactions, providing comprehensive treatment capability.
4Productivity
If conventional hydrocracking catalysts with small pores are used, then the catalyst structure is simpler, but large crude oil molecules cannot diffuse inside effectively
Solution Approach 1:
The patent employs hydrocracking catalysts with engineered porous structures having larger pore sizes compared to conventional catalysts. This porous design enables efficient diffusion of large crude oil molecules into the catalyst interior, increasing the number of active sites accessible to reactants and thereby enhancing reaction activity and selectivity for hydrocracking processes.
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 significantly reduces aromatic, metal, and nitrogen content, enhancing the production of chemical intermediates and fuels with improved catalytic functionality and efficiency.
Implementation Method 1
the primary function of the first catalyst (that is, the hydrodemetalization catalyst) is to remove metals from the heavy oil
Implementation Method 2
the primary function of the second catalyst (that is, the transition catalyst) is to remove metals, sulfur, and nitrogen from the heavy oil
Implementation Method 3
the primary function of the third catalyst (that is, the hydrodenitrogenation catalyst) is to further remove nitrogen, sulfur, or both
Implementation Method 4
the primary function of the fourth catalyst (that is, the first hydrocracking catalyst) is to reduce aromatic content in the heavy oil
Implementation Method 5
the primary function of the fifth catalyst (that is, the second hydrocracking catalyst) is to further reduce aromatic content in the heavy oil
Implementation Method 6
heavy oils may be upgraded and converted to at least chemical intermediates by subsequent processing, such as steam cracking
Data Source
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AI summary
According to one embodiment, a heavy oil may be processed by a method that may include upgrading at least a portion of the heavy oil to form an upgraded oil, where the upgrading comprising contacting the heavy oil with a hydrodemetalization catalyst, a transition catalyst, a hydrodenitrogenation catalyst, a first hydrocracking catalyst, and a second hydrocracking catalyst downstream of the first hydrocracking catalyst to remove at least a portion of metals, nitrogen, or aromatics content from the heavy oil and form the upgraded oil. The final boiling point of the upgraded oil may be less than or equal to 540 C. The second hydrocracking catalyst cracks at least a portion of vacuum gas oil in the heavy oil. The first hydrocracking catalyst may comprise a greater average pore size than the second hydrocracking catalyst.