STANDARD FUEL USED IN DETERMINING CETANE NUMBER AND DETERMINATION OF CETANE NUMBER BY USING SAME

摘要

PURPOSE:To obtain a standard fuel which can reduce the time taken to determine a cetane number and is easy to handle and of relatively low cost, by mixing n-tetradecane with tetralin. CONSTITUTION:A standard obtained by combining an-tetradecane with tetralin. Using this standard fuel, the cetane number of a diesel fuel can be determined as follows: the ignitability of a sample diesel fuel is compared with that of each of the n-tetradecane/tetralin mixtures in various ratios having prescribed cetane numbers according to the provisions of ASTM D613-84; the cetane number of the sample fuel is obtained as the vol% of n-tetradecane of the mixture showing ignitability equal to that of the sample fuel. As n-tetradecane, 14C n-paraffin separated from a kerosene or gas oil fraction of petroleum and having a purity of 97% or higher can be satisfactorily used. As tetralin, a commercially available product (having a purity of 98-99%) can be used.