Marine Fuel Stability via Fatty Acid Alkyl Ester Mediation
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Solution Overview
Problem
Marine fuels with residual hydrocarbon components face challenges in stability due to the presence of asphaltenes, which can lead to flocculation and precipitation, causing operational issues in marine vessels.
Innovation Solution
Incorporating a fatty acids alkyl esters component into the marine fuel composition, specifically blending it with residual hydrocarbon components before adding other components that decrease asphaltenes solvency power, to enhance stability and compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If residual hydrocarbon components are used in marine fuel compositions, then heavy oil fractions can be converted to beneficial use, but asphaltenes may come out of solution causing fuel instability
Solution Approach 1:
The patent introduces a mediator substance (such as a surfactant or compatibilizer) that acts between the residual hydrocarbon component and the asphaltene molecules. This intermediary prevents asphaltenes from aggregating and precipitating out of solution, thereby maintaining fuel stability while still enabling the use of heavy oil fractions. The mediator adsorbs onto asphaltene surfaces and provides steric or electrostatic stabilization.
Solution Approach 2:
The patent modifies key parameters of the fuel composition by adjusting the concentration of residual hydrocarbon components, adding specific additives with controlled molecular weights and functional groups, and optimizing the ratio of aromatic to paraffinic hydrocarbons. These parameter changes enhance the solvency power of the fuel matrix, preventing asphaltene precipitation while maintaining productivity.
2Object-affected harmful factors
If feedstocks of different compositions are blended to meet sulfur specifications, then lower sulfur content can be achieved, but compatibility issues may cause asphaltenes to precipitate
Solution Approach 1:
The patent systematically adjusts composition parameters including the ratio of different hydrocarbon feedstocks, the concentration of aromatic compounds, and the addition of specific additives. By optimizing these parameters, the fuel blend maintains sufficient solvency power to keep asphaltenes in solution even when combining feedstocks with different compositions to meet sulfur specifications.
Solution Approach 2:
The patent creates a composite fuel formulation that integrates multiple hydrocarbon feedstocks with complementary properties. The composite structure combines aromatic-rich components (which provide solvency for asphaltenes) with low-sulfur distillate components (which meet environmental specifications), achieving both goals simultaneously through careful formulation.
3Adaptability or versatility
If two stable fuels are combined, then fuel availability is improved, but the blend may become non-stable with flocculation and precipitation of asphaltenes
Solution Approach 1:
The patent applies preliminary action by pre-mixing the residual hydrocarbon component with a stabilizing additive or compatibilizer before blending with other fuel components. This preliminary stabilization ensures that asphaltenes are protected from precipitation even when the blend's overall solvency power decreases, allowing greater blending flexibility while maintaining stability.
Solution Approach 2:
The patent introduces an intermediary substance that mediates between components of different stable fuels. This intermediary (such as a dispersant or surfactant) prevents incompatibility-induced asphaltene precipitation, enabling broader blending options while maintaining blend stability. The intermediary acts as a bridge between incompatible feedstocks.
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 addition of fatty acids alkyl esters increases the asphaltenes stability reserve, reducing flocculation and precipitation, thereby improving the overall stability and compatibility of the marine fuel composition.
Implementation Method 1
increases the asphaltenes stability reserve... measured by a decrease in the amount of asphaltenes flocculation and/or precipitation
Data Source
AI summary
Method to improve or maintain stability and/or compatibility of a residual hydrocarbon fuel comprising: (a) blending at least 5-95% m/m of a residual hydrocarbon component with at least 5-80% m/m of a fatty acids alkyl esters component or (b) blending at least 5-80% m/m of a fatty acids alkyl esters component with a stable residual fuel composition comprising (i) at least 5-95% m/m of a residual hydrocarbon component and (ii) up to 90% m/m of a non-hydroprocessed hydrocarbon, a hydroprocessed hydrocarbon or any combination thereof; wherein the fatty acids alkyl esters component is blended with the stable residual fuel composition before at least one other fuel composition that decreases the asphaltenes solvency power of the residual fuel composition is added thereto.