FUEL OIL COMPOSITION AND ADDITIVES FOR IT Russian patent published in 2013 - IPC C10L1/14 C10L1/22 C10L1/224 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to application of nitrogen-containing dispersing agent as an antioxidation additive for diesel fuel composition containing biofuel. Nitrogen-containing dispersing agent is preferably chosen of the following substances: (i) reaction product of polyisobutene substituted derivative substance of amber acid, the molecular weight of PIB (polyisobutene) in which is 500 to 2800, and polyamine; and (ii) Mannich reaction product, which has been performed in presence of phenol, amine and aldehyde. Use of nitrogen-containing dispersing agent for improvement of resistance to oxidation of fuel composition containing biodiesel fuel and antioxidation additive is described. Besides, diesel fuel composition including biodiesel fuel, nitrogen-containing dispersing agent and conventionally used antioxidant is described, where nitrogen-containing dispersing agent is chosen from: (i) reaction product of polyisobutene substituted derivative substance of amber acid, the molecular weight of PIB (polyisobutene) in which is 500 to 2800, and polyamine; and (ii) Mannich reaction product, which has been performed in presence of phenol, amine and aldehyde.

EFFECT: addition of nitrogen-containing dispersing agent in combination with known antioxidation additive to fuel composition containing biodiesel fuel leads to improvement of fuel resistance to oxidation.

15 cl, 1 dwg, 14 tbl