Triglyceride Hydrotreating for Diesel Fuel Cetane Improvement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current processes for converting triglycerides, such as vegetable oils, into diesel fuel range hydrocarbons are inefficient, often requiring harsh conditions, resulting in undesirable products with poor physical properties and cetane ratings, and are not cost-effective.
Innovation Solution
A hydrotreating process that involves contacting triglycerides with a catalyst under specific conditions, including moderate temperatures and pressures, to produce diesel boiling range hydrocarbons with improved cetane numbers and physical properties, such as increased n-C17 fractions and reduced sulfur content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Bio-Diesel is produced by transesterification process, then combustion properties are improved, but gelling occurs in cold climates and cost effectiveness is not achieved
Solution Approach 1:
The patent changes the chemical parameters of the fuel by converting triglycerides into hydrocarbons through catalytic cracking, rather than producing Bio-Diesel through transesterification. This fundamental parameter change in the chemical composition eliminates the gelling problem while maintaining combustion properties, as the resulting hydrocarbon fuel has different physical properties than methyl esters.
2Reliability
If unmodified vegetable oils are used as diesel fuel additives, then cetane rating and lubricity are improved, but injector coking and combustion chamber degradation occur
Solution Approach 1:
The patent applies catalytic cracking to fundamentally change the chemical structure of vegetable oils, converting triglycerides into hydrocarbons with carbon chains in the C10-C20 range. This parameter change in molecular structure eliminates the harmful effects of unmodified oils while preserving the desirable cetane rating and lubricity properties.
Solution Approach 2:
The catalytic cracking process extracts and removes the problematic glycerol and fatty acid structures from the triglyceride molecules, separating them into desirable hydrocarbon components that can be used as clean diesel fuel additives without causing injector coking or combustion chamber degradation.
3Productivity
If harsh reaction conditions are employed to convert vegetable oil into hydrocarbons, then conversion is achieved, but product physical properties such as pour point and cloud point are insufficient
Solution Approach 1:
The patent uses moderate reaction conditions (temperature of 300-700°C and pressure of 1-10 atm) with specific catalysts to achieve conversion while controlling the physical properties of the products. By adjusting catalytic activity and reaction parameters, the process produces hydrocarbons with improved pour point and cloud point compared to harsh condition processes.
Solution Approach 2:
The patent employs composite catalytic systems that combine different catalyst components to achieve both high conversion efficiency and desirable product physical properties. The composite catalyst structure allows simultaneous optimization of reaction activity and product selectivity for improved pour and cloud points.
4Productivity
If complex and costly processes are used to convert triglycerides to hydrocarbons, then conversion is achieved, but cost effectiveness is reduced
Solution Approach 1:
The patent simplifies the conversion process by using moderate temperature and pressure conditions with readily available catalysts, eliminating the need for complex process equipment and expensive operating conditions. This parameter optimization reduces both capital and operating costs while maintaining effective triglyceride conversion.
Solution Approach 2:
The patent employs inexpensive catalyst materials that can be easily replaced or regenerated, avoiding the need for expensive specialized catalysts. This approach reduces the overall process cost while maintaining effective conversion capability.
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 enhances the cetane number and physical properties of the hydrocarbon products, improving their usability as diesel fuel, while reducing costs and operational challenges.
Implementation Method 1
contacting the mixture in a fixed bed reactor with a catalyst under conditions sufficient to produce a reaction product containing diesel boiling range hydrocarbons
Implementation Method 2
contacting the mixture with a hydrogen-containing diluent
Data Source
AI summary
Processes for the conversion of hydrocarbons boiling in the temperature range of from about 80° F. to about 1000° F. to diesel boiling range hydrocarbons, and processes for increasing the cetane number and amount of n-C17 hydrocarbon products in such processes. Diesel boiling range hydrocarbons may be produced by contacting a hydrocarbon boiling in the above-mentioned boiling range with a triglyceride-containing compound to form a mixture, and then contacting the mixture with a hydrotreating catalyst under suitable reaction conditions.