ISSN 1070-4272, Russian Journal of Applied Chemistry, 2008, Vol. 81, No. 12, pp. 2132–2136. © Pleiades Publishing, Ltd., 2008.
Original Russian Text © M.A. Nadzhafova, A.P. Mamedov, Dzh.Dzh. Musaev, 2008, published in Zhurnal Prikladnoi Khimii, 2008, Vol. 81, No. 12,
Generation of Resin–Asphaltene Substances in the Luminescent
Concentrate under Irradiation
M. A. Nadzhafova, A. P. Mamedov, and Dzh. Dzh. Musaev
Institute of Petrochemical Processes, National Academy of Sciences of Azerbaijan, Baku, Azerbaijan
Received July 2, 2008
Abstract—The effect of photoirradiation on the luminescent concentrate of heavy gas oil produced by catalytic
cracking (>400°C) was examined.
Secondary heavy petroleum residue finds limited
use today. Recent studies have shown that luminescent
concentrates, i.e., petroleum luminophores that are re-
covered from heavy gas oil produced by catalytic
cracking (HGCC), can be used in various branches of
science and technology. Petroleum and synthetic lu-
minophores are widely used in luminescence flaw de-
tection, as photosensitizers of decomposition of or-
ganic compounds, as dyes for polymeric materials, and
as working substances for information recording, stor-
age, and processing [1–3].
These processes involve, to a certain extent, the ac-
tion of atmospheric oxygen, radiation, illumination,
and heating on petroleum products, which leads to
their diverse photochemical and thermal oxidative
transformations deteriorating their quality.
The available data mainly refer to thermal oxida-
tive transformations [4–7]. Previous studies of photo-
chemical oxidative transformations of petroleum prod-
ucts have not revealed their mechanism, because they
did not use appropriate low-temperature techniques
allowing the rate of photochemical processes to be
considerably reduced and their elementary steps to be
revealed. Also, nearly no attention has been given to
the problem of the contribution of one- and two-photon
photochemical processes to transformations of petro-
leum products undergoing photochemical (in particu-
lar, photooxidative) transformations under illumination
in a wide spectral range covering the UV range and a con-
siderable part of the visible solar radiation.
Petroleum fractions thoroughly purified to remove
resin–asphaltene substances (RASs) exhibit paramag-
netism upon heat treatment [4–7] due to generation of
RAS free radicals (FRs). However, until recently, FRs
generated by photoirradiation of oils and their process-
ing products have not been detected.
In this study, we examined the results of UV irra-
diation of the luminescent concentrate (LC) recovered
from HGCC (>400°C). The high content of fused poly-
cyclic aromatic hydrocarbons (PACs) efficiently ab-
sorbing light allowed preparation from this substance
of multicomponent high-performance petroleum lu-
minophores used in nontraditional (for petroleum prod-
ucts) branches of science and technology.
AND INDUSTRIAL ORGANIC CHEMISTRY
The main physical methods we used were ESR,
UV, and IR spectroscopy. The procedures for perform-
ing experiments and recording ESR spectra have been
described previously . As a light source we used
a DRSh-500 mercury lamp with UFS-5 and ZhS-10
color filters. The ESR spectra were recorded with an
RE-1306 radiospectrometer under the conditions of
minimal saturation, using Mn
(S = 5/2) as a reference
for the magnetic field. The IR spectra were recorded
on a Specord M-80 spectrophotometer, and the UV/
visible spectra, on a Specord UV Vis spectrophotome-
ter in the range 200–700 nm at room temperature.
The LC of HGCC (>400°C) is a multicomponent
substance composed of naphthene–paraffin (NPH)
%), polycyclic aromatic (40 wt
%), and ole-
fin (2–3 wt
%) hydrocarbons. Their content was deter-
mined by fluorescence–indicator analysis (FIA) .