Electron Beam Radiolysis for LCO Cetane Upgrade
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Solution Overview
Problem
Current methods for upgrading light cycle oil (LCO) to increase its cetane number, such as hydrodearomatization and hydrocracking, are economically inefficient due to high capital expenses and hydrogen consumption, and fail to effectively reduce the substantial aromatic content that limits its suitability for diesel fuel.
Innovation Solution
A method involving the formation of an aqueous emulsion with a hydrocarbon stream, primarily light cycle oil, and treating it with an electron beam to cause radiolysis of water, producing intermediates that react with and open aromatic rings, thereby upgrading the cetane number of the oil without significant cracking or polymerization, followed by separation and hydroprocessing to produce a diesel range product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrodearomatization or hydrocracking is used to upgrade LCO, then cetane number increases, but capital expenses and hydrogen consumption increase significantly
Solution Approach 1:
The patent replaces conventional chemical processes (hydrodearomatization and hydrocracking) with an electron beam irradiation process. The electron beam generates radicals that chemically modify the aromatic compounds in LCO, converting them to non-aromatic compounds. This substitution eliminates the need for high hydrogen consumption and complex catalytic systems while achieving similar cetane number improvements.
Solution Approach 2:
The patent changes the fundamental processing parameters by using electron beam irradiation instead of thermal cracking or catalytic hydrogenation. The electron beam provides high-energy radiation that directly breaks chemical bonds in aromatic compounds, enabling ring opening and saturation without requiring high temperatures, pressures, or large hydrogen supplies. This parameter change results in lower operational costs and reduced hydrogen consumption.
2Reliability
If hydrodearomatization or hydrocracking is used to upgrade LCO, then cetane number increases, but capital expenses increase
Solution Approach 1:
The patent replaces complex catalytic cracking systems with a simpler electron beam irradiation system. The electron beam process requires only irradiation chambers and basic safety systems, eliminating the need for complex catalyst handling, high-pressure vessel networks, and extensive hydrogen infrastructure. This substitution significantly reduces capital expenses while maintaining effective aromatic removal.
3Quantity of substance
If conventional upgrading processes are used, then aromatic content is reduced, but operating pressures and hydrogen supply requirements increase
Solution Approach 1:
The patent substitutes high-pressure catalytic processes with low-pressure electron beam irradiation. The electron beam process operates at ambient or low pressures, eliminating the need for high-pressure vessels and complex pressure control systems. The radical chemistry induced by electron beams effectively reduces aromatic content without requiring elevated operating pressures or extensive hydrogen supply infrastructure.
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 results in a diesel range product with a higher cetane number than the original hydrocarbon stream, achieved at lower operating costs and with reduced hydrogen consumption, making it suitable for blending into diesel fuel.
Implementation Method 1
treating the emulsion with an electron beam causing radiolysis of the water into intermediates that react with and open rings of aromatic compounds
Data Source
AI summary
Methods and systems relate to treating an oil-in-water emulsion with an electron beam to decrease aromatic content therein for subsequent recovery of diesel products with upgraded cetane number. The method includes passing the emulsion formed of water and a hydrocarbon stream, such as light cycle oil, through an electron beam. The electron beam causes radiolysis of the water into intermediates that react with and open rings of aromatic compounds from the hydrocarbon stream. Separation of the water from the emulsion after the treating with the electron beam provides the diesel products, which may be hydroprocessed to remove oxygenates.