CATALYTIC TECHNOLOGY FOR REDUCING THE CONTENT OF AROMATIC HYDROCARBONS IN MOTOR FUELS

Аннотация

The aim of the work was to study the process of hydrodearomatization of diesel fractions for the
production of environmentally friendly fuels with a low content of aromatic hydrocarbons. The hydrogenation of two
diesel fractions 180-350°C and 230-360°C of PKOP LLP (PetroKazakhstanOilProducts, Shymkent) has been
studied. Rh-Pt/Al2O3 catalysts were used in the work. The influence of the technological parameters of the process of
hydrodearomatization (hydrogen pressure 2-6 MPa, temperature 100-220°C) on the reaction rate, conversion and
aromatic hydrocarbon content at the “aniline point” was investigated. To increase stability and resistance to
poisoning with sulfur-containing compounds of petroleum fractions, the carrier was modified with chromium oxide
and synthetic zeolite ZSM-5, which led to an increase in the reaction rate and conversion of aromatic hydrocarbons.
Optimal conditions have been selected (temperatures 200-220°C, hydrogen pressure 4-6 MPa, solvent - ethanol,
propanol, isopropanol) for hydrogenation of diesel fractions 180-350°C and 230-360°C on Pt-Rh-catalysts supported
on alumina and mixed carriers. The content of aromatic hydrocarbons was reduced by 10-20%. Some operational
properties of diesel fuel (kinematic viscosity at 20°C, pour point and cloud point and density at 20°C) of the initial
diesel fractions and after catalytic treatment were determined, the effect of temperature and pressure on the change in
these characteristics was investigated.