Russian Journal of Applied Chemistry, 2010, Vol. 83, No. 6, pp. 1121−1125.
Pleiades Publishing, Ltd., 2010.
Original Russian Text
I.G. Klimov, V.V. Kolyagin, E.O. Koval’, N.V. Maksimova, E.A. Maier, 2009, published in Khimicheskaya Promyshlennost’,
2009, Vol. 86, No. 8, pp. 407−413.
TECHNOLOGY OF ORGANIC
AND INORGANIC CHEMISTRY
Particularities of HPPE Production in Tubular Reactors
at Mixed Initiation
I. G. Klimov, V. V. Kolyagin, E. O. Koval’, N. V. Maksimova, and E. A. Maier
“Tomskneftekhim” Ltd., Tomsk, Russia
Received September 5, 2009
It was reported before  that the increase in the
conversion of ethylene up to 28% and, consequently,
the capacity of the production up to 230k tons per year
were provided as the result of the introduction of mixed
initiation on technological lines “Polymir-75” of the
high pressure polyethylene production.
Another positive particularity of the use of organic
peroxides as initiators of polymerization is the
improvement in management of the technological
process as the result of quick “response” of reactor block
on changes of conditions of initiation (within couple of
seconds). This allows modeling of necessary regimes
of polymerization on the basis of known constants of
decomposition of organic peroxides under different
temperatures and gives the possibility to expand the
range of production brand assortment.
The urgency of this issue is connected with fact that
the assortment of HPPE of all Russian producers does
not exceed dozen of low index brands with melt ﬂ ow
rate (MFR) from 0.3 to 2.5 g/10 min. “Ufaorgsintez”
OJSC is the only company which has monopoly to
produce brand 16803-070 for paper and cardboard
laminating . However polymer with MFR up to
16g/10 min in case of laminating, and with MFR from
20 to 40 g/10 min for casting of thin wall products,
production of casting compounds etc. is needed for
modern high speed producing equipment. Thus, for
example, brand with MFR 36 is produced according to
“Lupotech” technology, brand with MFR 38 is produced
by Eguistar Chemicals.
The lack of information in GOST 16337-77 regarding
features of such brands of HPPE is caused by the fact that
they have never been produced by domestic companies.
In the current work results of tests and analyses
of testing lot of polyethylene brand 17403-200
(table 1) developed in tubular reactor with the use of
initiating system of oxygen, supplied in all zones of
the reactor, operational peroxides, tert-butylperoxy-
2-ethylhexanoate (Trigonox 21S), and di-tert-butyl
peroxide (Trigonox B) added into the ﬁ rst and second
zones, and di-tert-butyl peroxide added into third zone,
with correction of working regime of the reactor by
temperature and pressure. Testing lot of 10 tons was
granulated without difﬁ culties. Visible difference of
physical mechanical characteristics can be explained by
signiﬁ cant difference of material density.
Temperatures and thermal effect of phase transitions,
the degree of crystallinity, content of branching and
double bonds (Table 2), molecular mass characteristics
(Fig. 1) of samples were determined by methods used
As expected there is a signiﬁ cant difference in
molecular mass distribution of polymers of testing lot
and basic brand (Table 3). Insigniﬁ cant decrease in
the degree of crystallinity and values of calorimetric
characteristics of the material brand 17403-200 can be
due to the lower pressure in reactor during the synthesis.
Together with positive aspects the use of peroxide
solutions in mineral oils with concentration up to
30% leads to appearance of additional amount of low
molecular components in the reaction medium; and this
can lead to increase in the content of extractable fractions