Abstract
Primaly reference fuel for testing cetane number of diesel fuels has so far been supplied by imports. however, in order to obtain this fuel in our country, a number of studies have been made, as a result of which it has been confirmed that molybdenum trisulfide is most suited for the fuel as catalyst which gives hydrocarbon having carbon number equal to that of primary fatty acid if molybdenum trisulfide is hydrogenerated by means of higher fatty acid and its ester used as raw material.
By means of spermaceti used as raw material, the effect of reaction conditions such as reaction temperature and adding quantity of catalyst on cetane number has been clarified. Spermaceti which is consisted of cetyl palmitate was considered suitable as raw material for manufacture of cetane, but it failed to produce desirable quantity of pure cetane because it is subjected to side chains because of its having straight chains, however, as it was found that the secondary reference fuel of cetane number 100 could be obtained from spermaceti to the required quantity, we have succeeded to industrialize it as the reference fuel of cetane number 100.
Furthermore, we succeed in obtaining the secondary reference fuel of cetane number 100 from hydrogenerated oil made from animal, vegetable and natural fats, sperm whale, soyabean oil, rice bran oil and Japan wax, on which further report will also be made.
