Russian Journal of Applied Chemistry, 2011, Vol. 84, No. 12, pp. 2071−2075.
Pleiades Publishing, Ltd., 2011.
Original Russian Text © B.A. Ul’yanov, I.A. Semenov, D.N. Sitnikov, M.Yu. Fereferov, 2011, published in Zhurnal Prikladnoi Khimii, 2011, Vol. 84, No. 12,
PROCESSES AND EQUIPMENT
OF CHEMICAL INDUSTRY
Plate Efﬁ ciency in Rectiﬁ cation of Binary Mixtures
in the Presence of an Inert Gas
B. A. Ul’yanov, I. A. Semenov, D. N. Sitnikov, and M. Yu. Fereferov
Angarsk State Technical Academy, Angarsk, Irkutsk oblast, Russia
Received October 29, 2010
Abstract—Effect of an inert gas in the vapor on the rectiﬁ cation efﬁ ciency of methanol–water and water–acetic
acid mixtures was studied. A common equation was used to describe the dependence of the separation efﬁ ciency
of methanol–water and water–acetic acid mixtures on the content of the inert gas in the vapor.
Rectiﬁ cation is one of the main methods for
separation of liquid mixtures into fractions or pure
components. The fundamental aspects of rectiﬁ cation
have been extensively studied. However, some speciﬁ c
features of this process require an additional analysis.
In particular, the effect of admixtures of an inert gas in
the vapor mixture on the efﬁ ciency of contact plates
has been insufﬁ ciently elucidated. An analysis of
a unit for recovery of methanol from a spent butane–
butylene fraction in manufacture of methyl-tert-butyl
ether revealed that the efﬁ ciency of the column for
rectiﬁ cation of a water–methanol mixture noticeably
decreases if n-butane behaving as an inert gas ﬁ nds way
into this column. To determine fundamental aspects of
this effect, we performed experiments on rectiﬁ cation of
two binary mixtures, methanol–water and water–acetic
acid, in the presence of an inert gas, nitrogen.
Our experiments were carried out on a RUT-
25 laboratory installation (Fig. 1) including a glass
rectiﬁ cation column 1 with a diameter of 28 mm, equipped
with 20 single-cap plates. The column having a vacuum-
tight insulation was connected to an evaporator-vessel
with a capacity of 1 dm
. The full-condensation head
with separated ﬂ uxes of ﬂ uid and vapor comprised a
vapor pipe 3, coil condenser 4 and rocking funnel 4
Fig. 1. Schematic of the laboratory installation. For
explanations, see text.