Multi-Stage Aromatic Saturation for Lubricant Base Oil Production
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Solution Overview
Problem
The petroleum industry faces challenges in finding profitable uses for unconverted feed portions from hydrocracking processes, particularly in reducing the aromatic content of petroleum fractions to meet regulatory standards for lubricant base oils, while minimizing equipment additions and maintaining system throughput.
Innovation Solution
Implementing a multi-stage aromatic saturation process using multiple catalyst beds with varying temperatures and hydrogen pressures to selectively reduce single-ring and multi-ring aromatics, allowing for the production of lubricant base oils that meet regulatory standards without significant increases in equipment or losses in throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a typical fuels hydrocracking process converts vacuum gas oil feedstocks to fuels, then high value products are generated, but unconverted feed portion remains that cannot be profitably used
Solution Approach 1:
The patent changes the processing parameters by adjusting catalyst composition (adding aromatic saturation catalysts with specific metal contents), temperature ranges (300-450°C), and pressure conditions to transform the hydrocracking process into a dual-function process that simultaneously produces fuels and lubricant base oils from the unconverted feed portion
Solution Approach 2:
The patent makes the hydrocracking process multi-functional by integrating aromatic saturation capability into the existing hydrocracking catalyst system, allowing the same reactor and catalyst to perform both hydrocracking and aromatic saturation functions, thereby converting unconverted feed into valuable lubricant base oils without requiring separate processing units
2Manufacturing precision
If aromatic content of petroleum fraction is reduced to meet regulatory standards for lubricant base oils, then regulatory compliance is achieved, but additional equipment and increased complexity are required
Solution Approach 1:
The patent merges the aromatic saturation function with the existing hydrocracking catalyst by incorporating aromatic saturation catalysts (containing Group VIII, IX, or X metals) into the hydrocracking catalyst composition, allowing both hydrocracking and aromatic saturation to occur in the same reactor without requiring separate equipment
Solution Approach 2:
The catalyst system is designed to perform multiple functions simultaneously: hydrocracking of vacuum gas oil and aromatic saturation of the unconverted feed portion, thereby achieving regulatory compliance for lubricant base oils without adding separate aromatic saturation units
3Manufacturing precision
If aromatic saturation is performed to produce lubricant base oils, then regulatory standards are met, but product yield losses occur
Solution Approach 1:
The patent optimizes processing parameters including temperature (300-450°C), pressure (10-300 atm), and catalyst composition to achieve aromatic saturation while minimizing unwanted side reactions and maximizing lubricant base oil yield from the unconverted feed portion
Solution Approach 2:
The patent converts the previously harmful or waste unconverted feed portion from hydrocracking into a valuable resource by applying aromatic saturation to produce lubricant base oils, thereby turning a loss into a profit center
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 reduces the aromatic content of petroleum fractions to meet regulatory standards for lubricant base oils, enhancing the profitability of hydrocracking processes by utilizing existing equipment and minimizing product yield losses.
Implementation Method 1
The aromatic content of such a petroleum fraction can be reduced using a aromatic saturation stage with multiple catalyst beds
Implementation Method 2
aromatic saturation stage with multiple catalyst beds... saturation of 1-ring aromatics in the petroleum fraction
Data Source
AI summary
Systems and methods are provided for hydroprocessing a petroleum fraction, such as a bottoms fraction from a fuels hydrocracking process, to generate a lubricant base oil. The aromatic content of such a petroleum fraction can be reduced using a aromatic saturation stage with multiple catalyst beds, or alternatively using a reactor (or reactors) with multiple aromatic saturation stages. The catalysts in the various beds or stages can be selected to provide different types of aromatic saturation activity. An initial bed or stage can provide activity for saturation of 1-ring aromatics in the petroleum fraction. One or more subsequent beds or stages, operating at successively lower temperature, can then be used to reduce the multiple-ring aromatic content of the petroleum fraction.