Diesel Oxidation Process for Cetane and Emission Control
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Solution Overview
Problem
Current methods for enhancing the Cetane number of diesel fuels, such as hydrogenation and non-hydrogenation routes, face challenges like high costs, high pressure and temperature requirements, and adverse effects on fuel stability, emission quality, and storage deposits, necessitating an improved process for better combustion quality and emission reduction.
Innovation Solution
A process involving the saturation of diesel range streams with an oxygen source, followed by oxidation under controlled pressure and temperature in the presence of an organometallic catalyst, such as metal phthalocyanines, to increase the Cetane number and lubricity while maintaining stability and meeting stringent emission norms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If hydrogenation route is used for cetane enhancement, then cetane number is improved, but process cost increases due to costly hydrogen and high pressure temperature requirements
Solution Approach 1:
The invention changes the reaction parameters from high temperature and pressure hydrogenation to lower temperature and pressure oxidation conditions. The process uses oxidation instead of hydrogenation, fundamentally altering the chemical reaction pathway to achieve cetane improvement without requiring costly hydrogen and extreme process conditions.
Solution Approach 2:
The invention replaces expensive hydrogen gas with cheaper oxidizing agents such as air or oxygen. The catalyst system used in the oxidation process is designed to be more cost-effective and easier to handle than the hydrogenation catalysts, reducing overall process costs.
2Manufacturing precision
If nitration route is used for cetane enhancement, then cetane number and pour point are improved, but storage stability deteriorates due to sediment formation and deposits
Solution Approach 1:
The invention changes the chemical reaction type from nitration to oxidation. This fundamental parameter change alters the chemical nature of the modifications made to the hydrocarbon molecules, producing oxygenated compounds instead of nitrated compounds, which do not form sediments or deposits and maintain storage stability.
3Quantity of substance
If oxidation is performed without selective control, then oxygen content increases, but cetane number may deteriorate due to non-selective oxidation
Solution Approach 1:
The invention uses a catalyst as an intermediary to control the oxidation reaction. The catalyst selectively facilitates oxidation at specific molecular sites that improve cetane number, preventing non-selective oxidation that would deteriorate fuel quality. The catalyst acts as a mediator between the oxidizing agent and the hydrocarbon molecules.
Solution Approach 2:
The oxidation process is made selective through catalysis, targeting specific functional groups or molecular structures within the diesel range stream. This local quality approach ensures that oxidation occurs only where it benefits cetane number, rather than random oxidation throughout the molecule.
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 effectively enhances the Cetane number and lubricity of diesel fuels, improves emission quality, particularly NOx reduction, and maintains storage stability, meeting Euro-III, IV, and V diesel fuel standards, with the ability to process larger volumes efficiently in smaller reactors.
Implementation Method 1
oxidation under controlled pressure and temperature in the presence of an organometallic catalyst, such as metal phthalocyanines
Implementation Method 2
saturation of diesel range streams with an oxygen source, followed by oxidation
Data Source
AI summary
The present invention discloses a process for enhancing quality of a hydrocarbon stream. More particularly, the present invention discloses a process for improvement of the combustion quality of a diesel range stream by dissolving an oxygen source in the feed stream before carrying out the oxidation, thereby enhancing the Cetane number, lubricity and reducing emission of the stream. The present invention also discloses a process for enhancing combustion quality of a hydrocarbon stream by carrying out the process in presence of an organometallic catalyst.