Russian Journal of Applied Chemistry, 2009, Vol. 82, No. 8, pp. 1501−1503.
Pleiades Publishing, Ltd., 2009.
Original Russian Text
V.L. Chechulin, 2009, published in Zhurnal Prikladnoi Khimii, 2009, Vol. 82, No. 8, pp. 1401−1403.
On the Condition of Rising the Content of the TiO
during a Vapor-Phase Hydrolysis
V. L. Chechulin
Perm State University, Perm, Russia
Received October 8, 2008
Abstract—On the basis of the examination of the data on the process of producing titanium dioxide by the vapor-
phase hydrolysis the temperature dependence of obtaining the contents of the rutile form of titanium dioxide and
chlorine in the finished product was studied.
The practical application of TiO
produced by the
vapor-phase hydrolysis from TiCl
 in the industry
of plastics and in the production of some types of paper
depends on the TiO
form, rutile or anatase. Technical
specifications normalize the rutile form content in
a ﬁ nished product to be no less than 90%, and in some
special cases even more: up to 95−97%. Theoretical
reasons point to the fact that rising the rutile form content
in the ﬁ nished product is connected with an increase in the
process temperature, as anatase and brookite irreversibly
turn to rutile on heating at 400−1000 and ~750°C,
respectively . An examination of concrete data on the
process of titanium dioxide production has shown that
the process temperature is the main factor of reaching
the required quality of the ﬁ nished product.
The vapor-phase hydrolysis proceeds at 550−1400°C
and higher by the reaction
(vapor) + 2H
O (vapor) = TiO
Fine particles of titanium dioxide subside under
own gravity and leave the plant, whereas waste gases
together with HCl are removed to a gas-cleaning units.
The complete an engineering scheme of the process is
given in .
The main data on the process of titanium dioxide
production are given in  where the effect of the
addition of the lowest titanium chlorides and silicon
tetrachloride on the process characteristics is described
(see the table).
Fig. 1. Three-dimensional drawing of the effects of (a) TiCl
, (b) SiCl
, and temperature on the content of the rutile TiO
to the data of . (ν) a component content, wt %; (T) temperature, C.