DEPRESSOR-DISPERSANT ADDITIVE FOR DIESEL FUEL, METHOD OF ITS OBTAINING AND METHOD OF OBTAINING DEPRESSANT AND DISPERSANT COMPONENTS OF DEPRESSOR-DISPERSANT ADDITIVE Russian patent published in 2019 - IPC C10L1/18 C10L1/196 C10L1/192 C08F8/46 C08F36/00 C08F136/00 C08F236/00 

FIELD: chemistry.

SUBSTANCE: invention describes depressor-dispersant additive to diesel fuel, which contains mixture of depressor and dispersing components, at the same time depressor component used is a polymer compound obtained via a radical copolymerisation reaction of maleic anhydride and fraction of 1-olefins C₈-C₂₄ with participation of radical polymerisation initiator, with ratio of initial reagents from 1:0.92 to 1:3.7 at temperature of 75–90 °C for 8–23 hours in appropriate solvent, after which the solvent is evaporated and the end product is separated, and the dispersing component is a polymer compound obtained via a metathesis copolymerisation reaction of functionalised norbornene and synthetic divinyl rubber and 1-hexene or 1-octene in the presence of a metal complex dialkyl ruthenium catalyst of general formula: where substitutes R₃ and R₄ are selected from the group: R3=Me, Et, R4=Et, Bn, R3+R4=CH₂CH₂OCH₂CH₂, in appropriate solvent, with ratio of functionalised norbornene: rubber from 1:15 to 1:1, ratio of catalyst: olefins in the reaction mixture from 1:350,000 to 1:10,000, at temperature of 25–70 °C for 8–23 hours, then reaction mixture is hydrogenated with hydrogen at pressure of 5–10 atm in presence of palladium, then filtered through aluminum oxide and filtrate is evaporated, depressor and dispersing components are in additive in ratio from 3:7 to 7:3 by volume. Also, the method of obtaining the specified additive is revealed.

EFFECT: improvement of low-temperature characteristics of diesel fuel and sedimentation stability during its cold storage and increase of yield of target products up to 95 wt%.

6 cl, 1 tbl, 30 ex