Fischer-Tropsch Naphtha Fuel Blend Octane Enhancement
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Solution Overview
Problem
Fischer-Tropsch derived naphtha components have been considered unsuitable for direct use in gasoline fuel compositions due to low octane numbers, despite their comparable distillation properties to gasoline.
Innovation Solution
A liquid fuel composition comprising 50-90% v/v of a C1-C4 alcohol, 10-50% v/v of Fischer-Tropsch derived naphtha with Research and Motor Octane Numbers up to 60, and optionally up to 10% v/v of a C3-C6 hydrocarbon component, achieving Research Octane Numbers of 80-120 and Motor Octane Numbers of 65-110.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If Fischer-Tropsch derived naphtha is used in gasoline fuel compositions, then distillation properties are improved (comparable to gasoline), but octane numbers deteriorate (too low)
Solution Approach 1:
The patent changes the chemical composition parameters of the fuel blend by specifying precise proportions of Fischer-Tropsch naphtha (10-40% by volume) combined with high-octane components. This parameter adjustment transforms the low-octane naphtha into a suitable fuel composition, achieving Research Octane Numbers of 80-120 while maintaining comparable distillation properties to gasoline.
Solution Approach 2:
The patent creates a composite fuel material by combining Fischer-Tropsch derived naphtha with other hydrocarbon components and oxygenates in specific ratios. This composite approach leverages the favorable distillation properties of naphtha while the additional components compensate for the low octane number, producing a fuel that meets both distillation and octane requirements.
2Productivity
If high proportion of Fischer-Tropsch naphtha is used, then cost and sustainability are improved, but octane number deteriorates
Solution Approach 1:
The patent optimizes the concentration parameter of Fischer-Tropsch naphtha within the range of 10-40% by volume, balancing cost-effectiveness with performance requirements. This parameter optimization ensures sufficient octane numbers (80-120 RON) are maintained while maximizing the use of sustainable Fischer-Tropsch naphtha for fuel production.
Data Source
AI summary
The present invention provides a liquid fuel composition suitable for use in an internal combustion engine comprising: (a) from 50 to 90 %v/v of a C1-C4 alcohol; (b) from 10 to 50 %v/v of a Fischer-Tropsch derived naphtha; and optionally (c) up to 10 %v/v of a C3-C6 hydrocarbon component. The present invention further provides a process for preparing a liquid fuel composition and a method of operating an internal combustion engine.