Studying the impact of different additives on the properties of straight-run diesel fuels with various hydrocarbon compositions

Maria Kirgina,Nurguyaana Nikonova,Andrey Altynov,Nataliya Belinskaya,Ilya Bogdanov,Alina Orlova

doi:10.2516/ogst/2021018

Abstract

One of the most widely used way to improve low-temperature properties of diesel fuels is the use of additives. However, a variety of additives and the effect of susceptibility make it difficult to select additive for a particular composition of diesel fuel and operating conditions. The laws of interaction between functional groups of additives and hydrocarbons of the diesel fraction have not been investigated yet. The article discusses the influence of fractional, group and structural-group composition of straight-run diesel fuels on the effectiveness of cold flow improvers. The effect of additives concentration on the effectiveness of their action is considered. It was shown that when selecting a cold flow improver for diesel fuel and determining its optimal concentration, it is necessary to take into account the optimal content of various groups of hydrocarbons in diesel fuel, at which a cold flow improver is most effective.

Highlights

In many countries, due to the climate conditions, it is important to produce high-quality and environmentally friendly petroleum products, and to provideProduction of low-freezing high-quality diesel fuel grades is being complicated from year to year as far as the raw material for oil refineries deteriorates due to the involvement of heavy, high-sulfur oil and fractions [5,6,7,8,9].There are various ways to improve low-temperature properties of diesel fuel (the cloud point, the pour point and the Cold Filter Plugging Point (CFPP))
First opinion suggests the adsorption of the depressant on the surface of the paraffin crystal, second opinion suggests the co-crystallization of the paraffin and the depressant
The depressant molecule is adsorbed on the crystal surface by the polar part, non-polar part faces the fuel medium and prevents agglomeration of the paraffin crystals and their association into an ordered structure

Summary

Introduction

Production of low-freezing high-quality diesel fuel grades is being complicated from year to year as far as the raw material for oil refineries deteriorates due to the involvement of heavy, high-sulfur oil and fractions [5,6,7,8,9]. There are various ways to improve low-temperature properties of diesel fuel (the cloud point, the pour point and the Cold Filter Plugging Point (CFPP)). The use of cold flow improvers (depressant, dispersant and depressant-dispersant) is the most common and the most cost-effective way [10,11,12]. Depressant additives interact with the surface of the incipient crystals and prevent their growth and association. The depressant molecule is adsorbed on the crystal surface by the polar part, non-polar part faces the fuel medium and prevents agglomeration of the paraffin crystals and their association into an ordered structure.

Objectives

Results

Conclusion