Multi-Catalyst Heavy Oil Upgrading Process
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing catalytic pretreatment processes for heavy oils lack enhanced catalytic functionality, particularly in aromatic cracking, metal removal, and nitrogen reduction, which hinders downstream refining efficiency.
Innovation Solution
A series of catalysts, including hydrodemetalization, transition, hydrodenitrogenation, and hydrocracking catalysts, are used in a specific arrangement to remove metals, nitrogen, and aromatics from heavy oils, with the hydrocracking catalyst featuring a mesoporous zeolite and metals to enhance cracking efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If existing catalysts are used in hydroprocessing pretreatments, then basic metal and nitrogen removal is achieved, but catalytic activity for aromatic cracking is insufficient
Solution Approach 1:
The catalyst system is divided into four distinct functional segments arranged in series: hydrodemetalization catalyst (removes metals), transition catalyst (removes metals and nitrogen), hydrodenitrogenation catalyst (removes nitrogen), and hydrocracking catalyst (reduces aromatic content). Each segment performs a specific function to progressively upgrade the heavy oil feedstock.
Solution Approach 2:
The hydrocracking catalyst employs a composite structure combining mesoporous zeolite (with average pore size 2-50 nm) and one or more metals. This composite material provides both the cracking activity needed for aromatic reduction and the pore structure necessary for accessing heavy oil molecules.
2Adaptability or versatility
If a single catalyst is used for heavy oil treatment, then process simplicity is maintained, but multiple functions (metal removal, nitrogen reduction, aromatic cracking) cannot be simultaneously achieved
Solution Approach 1:
The catalyst system is divided into four distinct functional segments arranged in series: hydrodemetalization catalyst (removes metals), transition catalyst (removes metals and nitrogen), hydrodenitrogenation catalyst (removes nitrogen), and hydrocracking catalyst (reduces aromatic content). Each segment performs a specific function to progressively upgrade the heavy oil feedstock.
Solution Approach 2:
The transition catalyst performs dual functions by removing both metals and nitrogen from the feedstock, bridging the gap between the hydrodemetalization and hydrodenitrogenation catalysts. This multi-functional approach reduces the need for separate catalysts while maintaining process efficiency.
3Productivity
If conventional catalysts are used, then basic hydroprocessing is achieved, but downstream refining efficiency is hindered
Solution Approach 1:
The catalyst system performs preliminary removal of metals, nitrogen, and aromatics from the heavy oil feedstock before downstream refining operations. This pretreatment prepares the feedstock for more efficient downstream processing by eliminating components that would otherwise interfere with subsequent refining steps.
Solution Approach 2:
The process achieves significant parameter changes in the feedstock composition: reducing metal content through hydrodemetalization, removing nitrogen through hydrodenitrogenation, and decreasing aromatic content through hydrocracking. These parameter changes transform the heavy oil into a more suitable feedstock for downstream refining.
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 multi-catalyst approach significantly reduces aromatic, metal, and nitrogen content in heavy oils, improving refining efficiency and product quality by upgrading the heavy oil feedstock.
Implementation Method 1
removing at least a portion of metals from the heavy oil in a hydrodemetalization reaction zone
Implementation Method 2
removing at least a portion of metals and at least a portion of nitrogen from the hydrodemetalization reaction effluent in a transition reaction zone
Implementation Method 3
removing at least a portion of nitrogen from the transition reaction effluent in a hydrodenitrogenation reaction zone
Implementation Method 4
reducing aromatics content in the hydrodenitrogenation reaction effluent in a hydrocracking reaction zone
Data Source
AI summary
In accordance with one embodiment of the present disclosure, a heavy oil may be upgraded by a process that may include removing at least a portion of metals from the heavy oil in a hydrodemetalization reaction zone to form a hydrodemetalization reaction effluent, removing at least a portion of metals and at least a portion of nitrogen from the hydrodemetalization reaction effluent in a transition reaction zone to form a transition reaction effluent, removing at least a portion of nitrogen from the transition reaction effluent in a hydrodenitrogenation reaction zone to form a hydrodenitrogenation reaction effluent, and reducing aromatics content in the hydrodenitrogenation reaction effluent in a hydrocracking reaction zone by contacting the hydrodenitrogenation reaction effluent to form an upgraded fuel.