Patent No. EP3585862 (titled "Blended Fuel Compositions With Improved Emissions Profiles") was filed by REG Synthetic Fuels on Jan 16, 2019. The application was issued on Mar 19, 2025.
A method for producing diesel fuel blends that exhibit improved emissions performance compared to conventional blends, while maintaining compatibility with conventional elastomers. The method involves blending petroleum diesel with biodiesel in a controlled manner to achieve optimal performance characteristics. The blending process is optimized through a combination of conventional blending techniques and specialized testing protocols, including a novel cold soak filter blocking test that provides a more accurate measure of filter-plugging potential than conventional cold soak tests. The optimized blend composition is then formulated into a fuel product that meets or exceeds the performance requirements of conventional diesel fuels, while maintaining compatibility with conventional elastomers.

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