Formulated Propellants with Low Aromatics for Thermal Stability
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Solution Overview
Problem
The limited supply and redundancy of Rocket Propellant-1 (RP-1) pose challenges in optimizing fuel formulations for launch vehicles and rockets, necessitating the development of alternative propellant formulations that meet specific chemical and physical property specifications.
Innovation Solution
Formulated propellants are created by blending hydrocarbon fluids with distillation curves between 365° F. (185° C.) and 525° F. (273° C.), meeting RP-1 specifications, and incorporating less than 5% aromatics and 30 ppm sulfur, which can include multiple hydrocarbon fluids with varying densities and sources such as petroleum refining cuts or biomass conversion, to enhance performance and availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RP-1 is used as the propellant system, then the propellant performs reliably in launch vehicles and rockets, but the supply is limited and there is little opportunity to optimize fuel formulations
Solution Approach 1:
The patent changes the chemical composition parameters of the propellant by specifying precise ranges for aromatics (less than 5% by volume), sulfur (less than 30 ppm), and distillation curve characteristics (10% point between 365-410°F, endpoint at or below 525°F). These parameter changes enable alternative formulations that maintain reliability while improving supply adaptability and optimization opportunities.
Solution Approach 2:
The patent employs composite hydrocarbon formulations combining multiple components with specific properties. By blending different hydrocarbon sources (petroleum refining cuts, biomass conversion cuts, gas to liquid cuts) that each meet specific compositional criteria, the invention creates composite propellants that achieve both reliability and formulation flexibility.
2Reliability
If RP-1 is used as the propellant system, then the propellant meets established specifications, but there is little to no redundancy in supply in the event of supply shortages or failures
Solution Approach 1:
The patent creates a universal propellant specification that can be satisfied by multiple different hydrocarbon sources and formulation approaches. The standardized compositional requirements (aromatics, sulfur, distillation curve) can be met by petroleum refining cuts, biomass conversion cuts, gas to liquid cuts, and other sources, providing supply redundancy and multiple sourcing options while maintaining specification compliance.
3Use of energy by moving object
If traditional RP-1 formulations are used, then the propellant provides adequate performance, but thermal stability is limited and cooling coil fouling occurs
Solution Approach 1:
The patent improves thermal stability by strictly controlling compositional parameters, specifically limiting aromatics to less than 5% by volume and sulfur to less than 30 ppm, with preferred embodiments specifying less than 100 ppm aromatics and less than 3 ppm sulfur. These parameter changes reduce thermal degradation and fouling while maintaining combustion performance through optimized distillation curve characteristics.
Data Source
AI summary
Formulated propellants and methods of forming the same are described herein. The formulated propellants include a hydrocarbon fluid, wherein the formulated propellant exhibits a distillation curve 10% point at a temperature between 365° F. (185° C.) and 410° F. (210° C.) and an end point at or below 525° F. (273° C.).