Hydrous Ethanol Gasoline Blend Phase Stability
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Solution Overview
Problem
Existing methods for producing gasoline-ethanol blends, or gasohol, require significant energy and infrastructure to prevent the formation of a separate liquid phase, which is harmful to fuel storage and distribution systems, and often use anhydrous ethanol due to the challenges posed by hydrous ethanol's water content.
Innovation Solution
A motor fuel composition using hydrous ethanol and gasoline, blended within specific compositional ranges, that remains substantially in one phase without additives, allowing for production at fuel distribution terminals without major processing facilities, by leveraging a ternary liquid-liquid phase diagram to maintain 'clear and bright' specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If hydrous ethanol is used as feedstock for producing gasohol, then production cost and energy consumption are reduced, but a separate liquid phase forms which is harmful to fuel storage and distribution systems
Solution Approach 1:
The invention changes the compositional parameters of the gasohol blend by specifying precise ranges of ethanol (2-50% by weight) and water (1-10% by weight of ethanol) content. By controlling these parameters within defined limits, the formulation ensures that water remains dissolved in the ethanol-gasoline mixture without forming a separate phase, thus allowing the use of lower-cost hydrous ethanol while preventing harmful phase separation.
2Stability of the object's composition
If conventional methods are used to prevent phase separation in gasohol, then fuel stability is improved, but production requires major processing facilities and substantial energy input
Solution Approach 1:
The invention enables simple blending operations at fuel distribution terminals without requiring complex processing facilities. By using the specified compositional ranges of ethanol and water, the system achieves self-stabilization where the blend remains homogeneous through proper formulation alone, eliminating the need for reactors, distillation columns, extraction columns, and other major processing equipment that would otherwise be required.
3Stability of the object's composition
If anhydrous ethanol is used instead of hydrous ethanol, then phase separation is prevented, but production cost and energy consumption increase significantly
Solution Approach 1:
The invention changes the water content parameter from near-zero (anhydrous ethanol) to a controlled range of 1-10% by weight of ethanol. This parameter change allows the use of hydrous ethanol which requires less energy and costs less to produce, while still maintaining phase stability through the specified compositional boundaries that prevent water from separating into a distinct liquid phase.
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 solution enables the production of a stable, homogeneous gasohol fuel using hydrous ethanol, reducing energy consumption and infrastructure needs, while maintaining the 'clear and bright' specification by ensuring minimal phase separation and similar physical properties of the coexisting liquid phases.
Implementation Method 1
leveraging a ternary liquid-liquid phase diagram to maintain 'clear and bright' specifications
Data Source
AI summary
Motor fuel compositions containing ethanol, also known as gasohol, are disclosed, wherein the motor fuel is substantially in one phase and contains, 1 to 50, preferable 2 to 30 weight % of ethanol and an amount of water between 1 and 10 wt. % on the basis of the weight of the ethanol. Such motor fuel compositions can be produced by blending gasoline with hydrous ethanol, thus evading the necessity to use anhydrous ethanol as feedstock. Furthermore such motor fuel compositions may be produced by blending gasoline with hydrous ethanol and anhydrous ethanol, thus evading the necessity to use anhydrous ethanol as the sole feedstock. These motor fuel compositions may contain a second liquid phase that does not form a separate layer, and where no separate liquid phase can be detected by vision, and so meets with the specification that has become known as “clear and bright”.