1070-4272/03/7603-0503$25.00C2003 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 76, No. 3, 2003, pp. 503!504. Translated from Zhurnal Prikladnoi Khimii, Vol. 76, No. 3,
2003, pp. 518!519.
Original Russian Text Copyright + 2003 by Alimatov, Sedov.
Water Treatment To Remove Phenols in a Bubble Extractor
B. A. Alimatov and V. M. Sedov
Fergana Polytechnic Institute, Fergana, Uzbekistan
Russian Research Institute of Petrochemistry, St. Petersburg, Russia
Received June 6, 2002
Abstract-Water treatment to remove phenols using a bubble extractor is studied for specific conditions
of the Fergana Refinery.
In oil-refining industry, to remove phenols, water is
treated using such methods as extraction and evapora-
tion, since the phenol concentration in wastewater is
mostly high (above 33 4gl
), and recycling of phe-
nols completely covers the expenses for their recovery
. In extractive recovery, such solvents are used as
carbon tetrachloride, butyl acetate, benzene, etc.
For wastewater treatment to remove phenols, a
bubble extractor was proposed , whose design and
operation are shown in the figure.
Vertical housing 1 of the extractor is divided into
separate settler sections with horizontal baffle plates 2.
Mixing elements consisting of inner (3) and outer (4)
concentric pipes are arranged on baffle plates 2. The
lower ends of the pipes 3 run out under the baffle
plate 2, being gas-distributing nozzles 5 with holes 6
in their sidewalls. Downpipes 7 with holes 8 at the
lower blanked-off end sides are also arranged at the
baffle plates 2. The downpipes 7 are covered from
above with caps 9 having cuts 10 at the lower section
and holes 11 in the upper covers. Gas-intake pipes 12
are also arranged at baffle plates 2. At the upper
blanked-off ends they have holes 13 for supply of
an inert gas to the annular channel between concentric
pipes 3 and 4 of the mixing element.
The extractor flowsheet is as follows. A light fluid
is supplied to pipe 3 through the lower section of gas-
distributing nozzle 5. A heavy fluid is supplied right
there through holes 8 in downpipes 7. Moving
together bottom-up along pipe 3, the fluids are vigor-
ously mixed with a part of the inert bubbling gas that
is fed through holes 6 and collected after mixing in
a [gas bag] under baffle plate 2. Another part of the
inert gas is supplied through holes 13 of gas-intake
pipes 12 to the annular channel between concentric
pipes 3 and 4. Moving bottom-up through a counter-
current flow of the fluids, the inert gas vigorously
Bubble extractor (for explanation, see text).
mixes them and is then collected in a [gas bag] under
baffle plate 2.
Fluids mixed with the inert gas bubbles in pipe 3
and additionally in the annular channel between con-
Table 1. Characteristics of extractors (phenolic water3
benzene liquid system)
³ Number³ Efficiency
³ of steps ³ of step
Mixer3settler ³ 5 ³ 0.7330.79
Mixer3settler with a transfer pump³ 3 ³ 0.95
Mixer3settler with a stirrer ³ 8 ³ 0.75
Multistep bubble extractor ³ 3 ³ 0.93