METHOD OF OBTAINING CETANE-INCREASING ADDITIVES TO DIESEL FUEL Russian patent published in 2014 - IPC C10L10/12 C07C203/04 C07C201/02 C10L1/23 C10L1/22 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of obtaining cetane-increasing additives to Diesel fuel, including nitration of secondary alcohols, where as the alcohols used is a fraction of secondary C₆-C₉ alcohols, obtained by a method of a liquid phase oxidation of a fraction of n- C₆-C₉ alkanes with a water solution of hydrogen peroxide in a methanol medium on a heterogenous catalyst DP-2, and further hydration of the reaction mass on a rigid cellular catalyst P1/ A₂O₃, nitration is carried out with a 5-10-fold molar excess of nitric acid with the concentration of 50-80% in the presence of 1-5 wt % of nitric acid of a heterogenous superacidic catalyst based on sulphated zirconium oxide - ZrO₂/SO₄ ^2- /γ-Al₂O₃ in the interval of temperatures from 0° to 10°C. To prevent oxidation of the fraction of C₆-C₉ alcohols with nitric acid the process is carried out in the presence of carbamide in an amount of 0.5-5%. With an addition of 0.5 wt % of an additive obtained in accordance with the claimed method a gain of cetane number in a quantity of 7-11 units is observed.

EFFECT: reduction of expenditures on raw material, reduction of an amount of sewage waters, reduction of the quantity of the process stages.

2 cl, 4 ex