Diamondoid Fuels from Renewable Oils
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Solution Overview
Problem
Current renewable fuels derived from vegetable oils lack the high density and net heat of combustion required for efficient operation in diesel and turbine engines, limiting range, loiter time, and payload capabilities, and have a significant carbon footprint.
Innovation Solution
A method for converting vegetable oils into high-density diamondoid fuels through catalytic processes, optimizing density, net heat of combustion, low temperature viscosity, and cetane number by modifying oil feedstock, catalyst, and operating conditions, using mesoporous acidic zeolites and fractional distillation to produce alkyl adamantanes suitable for blending with other fuels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If vegetable oils are used as renewable fuel sources, then environmental sustainability is improved, but fuel density and net heat of combustion are insufficient
Solution Approach 1:
The patent applies parameter changes by transforming the molecular structure of vegetable oil through catalytic cracking and cyclization reactions. This converts linear triglyceride molecules into compact diamondoid structures (adamantane, tetrahydrodimethyldicyclopentadiene), fundamentally altering physical properties including density (increasing to >0.89 g/mL) and net heat of combustion (exceeding 135,000 btu/gal) while maintaining renewable sourcing
Solution Approach 2:
The invention creates composite fuel formulations by blending diamondoid fuels with conventional jet fuels or other hydrocarbons. This produces blended fuels that combine the renewable sustainability benefits of vegetable oils with the proven performance characteristics of traditional fuels, achieving both environmental and performance goals
2Object-affected harmful factors
If vegetable oils are used as renewable fuel sources, then environmental sustainability is improved, but net heat of combustion is insufficient
Solution Approach 1:
The patent applies parameter changes by transforming the molecular structure of vegetable oil through catalytic cracking and cyclization reactions. This converts linear triglyceride molecules into compact diamondoid structures (adamantane, tetrahydrodimethyldicyclopentadiene), fundamentally altering physical properties including density (increasing to >0.89 g/mL) and net heat of combustion (exceeding 135,000 btu/gal) while maintaining renewable sourcing
3Quantity of substance
If catalytic cracking and cyclization processes are used to increase fuel density, then fuel performance is improved, but processing complexity increases
Solution Approach 1:
The patent employs catalysts as intermediaries to mediate the complex chemical transformations. Solid acid catalysts (zeolites, heteropoly acids) facilitate cracking and cyclization reactions, enabling the conversion of vegetable oils to diamondoid fuels under controlled conditions. The catalyst acts as a mediator that simplifies the overall process by providing selective reaction pathways
Solution Approach 2:
The invention utilizes porous materials, specifically mesoporous zeolite catalysts with controlled pore structures (e.g., MCM-41, SBA-15), to conduct the cracking and cyclization reactions. The porous structure provides high surface area for catalysis while controlling product distribution, enabling efficient transformation with manageable process complexity
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 method generates fuels with densities over 0.89 g/mL and net heats of combustion exceeding 135,000 btu/gal, enhancing range, loiter time, and payload capabilities while reducing carbon footprint by utilizing renewable sources.
Implementation Method 1
heating a renewable plant oil, triglyceride, or fatty acid with at least one acid catalyst to generate a first mixture of alkyl adamantanes
Implementation Method 2
cracking the first mixture of alkyl adamantanes by continued heating and/or addition of a second catalyst to the first mixture of alkyl adamantanes
Implementation Method 3
fractionally distilling the second alkyl adamantane mixture to produce a third alkyl adamantane mixture enriched in C11-C14 alkyl adamantanes
Implementation Method 4
heating a renewable plant oil, triglyceride, or fatty acid with at least one acid catalyst
Data Source
AI summary
A method for making high density fuels including, heating a renewable plant oil, triglyceride, or fatty acid with at least one first acid catalyst to generate a first mixture of alkyladamantanes, increasing reaction time or adding at least one second catalysts to a first mixture of alkyladamantanes to produce a second alkyladamantane mixture, separating methyl, ethyl, propyl, and/or butyl adamantanes from a second alkyladamantane mixture to produce a third adamantane mixture to produce fuels.