Multifunctional Catalyst for Aviation Fuel Production
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Solution Overview
Problem
Current processes for producing aviation fuel from renewable feedstocks like plant oils and animal fats often result in products with carbon chain lengths suitable for diesel fuel rather than aviation fuel, and require multiple reaction stages and high capital and operating costs.
Innovation Solution
A single reaction stage process involving hydrogenation, deoxygenation, isomerization, and selective hydrocracking, using a multifunctional catalyst, to produce hydrocarbons with boiling points in the aviation fuel range, with an optional steam reforming step to generate hydrogen and a hydrocarbon recycle to optimize reaction conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single reaction stage process is used, then capital and operating costs are reduced, but it is difficult to achieve both deoxygenation and selective hydrocracking to produce aviation fuel range products
Solution Approach 1:
The patent combines multiple reaction functions (hydrogenation, deoxygenation via decarboxylation/decarbonylation, isomerization, and selective hydrocracking) into a single integrated reaction zone. This merging of functions reduces the number of separate reaction stages required, thereby lowering capital and operating costs while maintaining the ability to produce aviation fuel range hydrocarbons from renewable feedstocks
Solution Approach 2:
The catalyst system employed in the single reaction stage is designed to perform multiple functions simultaneously: hydrogenation of unsaturated bonds, deoxygenation through decarboxylation and decarbonylation pathways, isomerization of straight-chain paraffins to branched isomers, and selective hydrocracking to reduce carbon chain length. This multi-functional catalyst enables one reaction zone to accomplish what traditionally required multiple specialized stages
2Reliability
If deoxygenation is performed in a hydrogen environment with hydrotreating catalyst, then oxygen is removed from feedstock, but the resulting product has carbon chain lengths suitable for diesel fuel rather than aviation fuel
Solution Approach 1:
The patent merges the deoxygenation function with selective hydrocracking in a single reaction stage. By integrating these two functions, the process removes oxygen from the feedstock while simultaneously controlling the carbon chain length through selective cracking, producing hydrocarbons in the aviation fuel boiling range rather than diesel range
Solution Approach 2:
The patent employs specific reaction conditions including temperature range of 300-450°C, pressure of 50-200 atm, and specific catalyst compositions to control the hydrocracking activity. These parameter adjustments enable selective C-C bond cleavage to reduce carbon chain length from diesel-range to aviation fuel-range while maintaining deoxygenation efficiency
3Manufacturing precision
If multiple reaction stages are used, then product specifications can be met, but capital and operating costs increase
Solution Approach 1:
The patent consolidates multiple reaction stages (hydrogenation, deoxygenation, isomerization, and hydrocracking) into a single integrated reaction zone with a multi-functional catalyst system. This merging maintains manufacturing precision by achieving all required transformations in one pass, thereby meeting aviation fuel specifications while reducing capital and operating costs associated with multiple separate stages
Solution Approach 2:
The single reaction stage employs a universal catalyst system capable of performing all necessary reactions: hydrogenation of double bonds, deoxygenation via decarboxylation and decarbonylation, isomerization of n-paraffins to iso-paraffins for cold flow properties, and selective hydrocracking for carbon number control. This multi-functionality eliminates the need for multiple specialized reaction stages
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 process efficiently produces aviation fuel with desired carbon chain lengths and properties, reducing capital and operating costs by integrating reactions in a single stage and minimizing hydrogen consumption, while meeting aviation fuel specifications.
Implementation Method 1
hydrogenating, deoxygenating (including decarboxylation, decarbonylation, and hydrodeoxygenation), isomerizing, and selectively hydrocracking the renewable feedstock in a reaction zone in the presence of hydrogen
Implementation Method 2
deoxygenating (including decarboxylation, decarbonylation, and hydrodeoxygenation)
Implementation Method 3
deoxygenating (including decarboxylation, decarbonylation, and hydrodeoxygenation)
Implementation Method 4
deoxygenating (including decarboxylation, decarbonylation, and hydrodeoxygenation)
Implementation Method 5
isomerizing, and selectively hydrocracking the renewable feedstock
Implementation Method 6
selectively hydrocracking the renewable feedstock
Implementation Method 7
An optional reforming step or steam reforming step may be included to generate the hydrogen needed in the hydrogenation, deoxygenation, and the hydrocracking reactions
Data Source
AI summary
A hydrocarbon product stream having hydrocarbons with boiling points in the aviation fuel range is produced from renewable feedstocks such as plant and animal oils. The process involves treating a renewable feedstock by hydrogenating, deoxygenating, isomerization, and selectively hydrocracking the feedstock to produce paraffinic hydrocarbons having from about 9 to about 16 carbon atoms and a high iso/normal ratio in a single reaction zone containing a multifunctional catalyst, or set of catalysts, having hydrogenation, deoxygenation, isomerization and selective hydrocracking functions.