Diesel fuel composition

Abstract

A diesel fuel composition which essentially comprises only paraffins, and which is characterised in that 1) the normal paraffins with 18 or fewer carbons constitute not less than 12% by mass, and 2) the proportion of the total peak area of the peak group at chemical shifts of 1.45 to 2.25 ppm relative to the total peak area of the peak group at chemical shifts of 1.00 to 1.45 ppm is less than 6.5% in proton nuclear magnetic resonance (1H-NMR) spectra, and which has an oxidation index OI of less than 1.10. OI is represented by the equation OI = 0.247X - 0.001Y - 0.053, wherein X is the proportion (%) of the total peak area of the peak group at chemical shifts of 1.45 to 2.25 ppm relative to the total peak area of the peak group at chemical shifts of 1.00 to 1.45 ppm in proton nuclear magnetic resonance (1H-NMR) spectra; and Y is the content (mass %) of normal paraffins with 18 or fewer carbons.

Description

technical field [0001] This invention relates to diesel fuel compositions. More specifically, it relates to diesel fuel compositions having excellent oxidation stability while consisting essentially only of paraffins. Background technique [0002] Various studies have been conducted in Japan in recent years to fuel automobiles using Fischer-Tropsch fuel (hereinafter referred to as FT fuel). The meaning of FT fuel refers to a fuel synthesized from raw materials such as natural gas, coal, or biomass via synthesis gas (a mixture of carbon monoxide and hydrogen) using the Fischer-Tropsch method. They are usually used by names corresponding to the raw materials. For example for those where natural gas is the feedstock, the name GTL is usually used, if coal is the feedstock the name CTL may be used, and if biomass is the feedstock the name BTL may be used. The term GTL is also sometimes used as a general name for fuels obtained by the Fischer-Tropsch process, but in the present...

AI Technical Summary

Problems solved by technology

However, for fuels with poor oxidation stability, the amount of antioxidant required to obtain the desired effect becomes larger, and the production cost increases

In addition, as the amount of antioxidant increases, there is a problem that the antioxidant is easily separated at a lower temperature, or conversely, if the amount added is too small, there is a problem that after the effect of the antioxidant has been exhausted during oxidation , oxidation stability will significantly crack, there may be adverse effects such as corrosion of metal components in automotive fuel systems

There are problems in the prior art when dealing with the oxidation stability of FT Diesel by blending components other than FT Diesel in the fuel composition, this fundamental characteristic of FT Diesel is not fully manifested

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