Oxidative Desulfurization Catalyst Decomposes Sulfones
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Solution Overview
Problem
Current methods for reducing sulfur content in hydrocarbon fuels to ultra-low levels are costly and inefficient, particularly in existing hydrotreating facilities, due to the difficulty in removing refractory sulfur compounds under stringent environmental regulations.
Innovation Solution
The use of a solid base catalyst composition, including zinc oxide, aluminum oxide, zinc aluminates, layered double hydroxides, and magnesium/aluminum layered double hydroxide, in conjunction with a caustic solution, to catalytically decompose oxidized sulfur compounds into SOx, which are then removed, thereby reducing the sulfur content in hydrocarbon fuels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional hydrodesulfurization is used to reduce sulfur content to ultra-low levels, then sulfur removal efficiency is improved, but operating conditions become more severe (higher temperature and pressure) and capital investment increases
Solution Approach 1:
The patent changes the chemical parameter of the desulfurization reaction by using oxidative desulfurization instead of conventional hydrodesulfurization. This transforms the reaction mechanism from hydrogenation-based to oxidation-based, allowing sulfone formation at milder temperatures and pressures, thereby resolving the contradiction between sulfur removal efficiency and severe operating conditions
Solution Approach 2:
The patent employs strong oxidizing agents (such as hydrogen peroxide, peracetic acid, or ozone) to accelerate the oxidation of sulfur compounds to sulfones. This enables efficient sulfur removal under milder conditions compared to conventional thermal hydrodesulfurization, directly addressing the contradiction by achieving high sulfur removal without requiring elevated temperatures and pressures
2Object-generated harmful factors
If existing hydrotreating facilities are upgraded to meet ultra-low sulfur specifications, then sulfur removal capability is improved, but facility complexity and capital investment increase
Solution Approach 1:
The patent makes existing hydrotreating facilities multi-functional by integrating oxidative desulfurization capabilities into the existing hydrodesulfurization system. The same reactor and catalyst bed can perform both HDS and ODS functions sequentially or simultaneously, eliminating the need for separate oxidative desulfurization units and reducing overall facility complexity
Solution Approach 2:
The patent merges the oxidative desulfurization process with the existing hydrodesulfurization facility by combining the two processes in a single reactor system. The oxidizing agent is introduced into the existing HDS reactor, allowing both desulfurization mechanisms to operate in the same equipment, thereby avoiding additional facility complexity and capital investment
3Object-generated harmful factors
If high pressure hydrotreating is implemented to achieve ultra-low sulfur levels, then sulfur removal efficiency is improved, but energy consumption and operational costs increase
Solution Approach 1:
The patent changes the fundamental reaction parameters from high-pressure hydrogenation to low-pressure oxidation. By using oxidizing agents at atmospheric or near-atmospheric pressures, the process eliminates the need for high-pressure compressors and associated energy consumption, while still achieving ultra-low sulfur levels in the product
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 allows for efficient and cost-effective reduction of sulfur levels in hydrocarbon fuels to ultra-low concentrations, maximizing product yield and enabling the use of existing equipment under mild operating conditions, thus meeting stringent environmental standards without the need for extensive facility upgrades.
Implementation Method 1
contacting the mixture with an effective amount of solid base catalyst composition in the presence of a caustic solution. The solid base catalyst composition includes separate components or a mixture of zinc oxide, aluminum oxide, zinc aluminates, layered double hydroxides, and magnesium/aluminum layered double hydroxide. The contacting occurs under conditions effective to promote catalytic decomposition of a portion of the oxidized sulfur compounds into SOx
Implementation Method 2
contacting the mixture with an effective amount of solid base catalyst composition in the presence of a caustic solution
Data Source
AI summary
The process provided herein is concerned with disposal of oxidized sulfur compounds formed by oxidative desulfurization. The process uses solid base catalyst pretreated with a base and eliminates the need to separate the sulfones from the hydrocarbon streams and recover the hydrocarbons.