蒽醌法双氧水生产英文工艺流程翻译
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AO Process description
Work solution (WS) is pumped into filters to remove solid impurity, and
then is preheated (or cooled) by going through heat exchanger and preheater.
Hydrogen, which comes from chlor-alkali plant, is purified by filter, and then
gets into hydrogenator with WS at the same time.
The hydrogenator is consisted of three palladium catalyst beds, and each
section has gas and liquid distributer. The distributer can make the gas and
liquid those get into the tower well-distributed. Any section of the three beds
can be used alone or two sections in series and three parts at the same time (in
series) if necessary, which bases on the need of process and hydrogenate
efficiency and activity of palladium catalyst.
When two sections of the hydrogenater are used in series, the WS and
hydrogen first get into the top of upper section, and then go through the
palladium bed in concurrent downwards. After that, both the two flow out from
the bottom of the upper section and then get into the top of down section by
pipe outside the tower. The WS and hydrogen (not reacted) flow out from the
bottom of the down section and then go into hydrogenater degasser.
Hydrogenated WS (HWS) and the not reacted hydrogen, which together
come out from the hydrogenator, go into hydrogenator degasser. The gas flows
out from the top, and then gets into condenser. Condensate goes into receiver
tank, and off gas is exhausted after controlling the flow by flow meter.
Determined level of the degasser is controlled by auto valve. 10% HWS 2
first gets into alumina bed, and then together with other 90% HWS go through
filters to remove solid impurity. After that, HWS going through heat exchanger
and then gets into tank. Little hydrogen or other gases, which dissolve in the
HWS, resolve in the tank. The gases then go into condenser, and are exhausted
by evacuation water seal and flame arrester.
Part of the hydrogenated WS, which flows out from the hydrogenator
degasser, is pumped back into the hydrogenator. This can make the temperature
of the tower well-distributed, and hydrogenated efficiency steady and operation
safe.
Hydrogenated WS (HWS) and phosphoric acid are pumped into HWS
cooler, in which the temperature of HWS is cooled down to 50～55℃, and then
both get into upper part of oxidizer. The HWS is stored in HWS tank, and the
phosphoric acid is stored in phosphoric acid mixing tank. Phosphoric acid is
pumped by metering pump.
There are three hollow sections of the oxidizer and the air is introduced into
the tower from the bottom of middle and lower sections separately. The air is
distributed into small bubble by gas distributor. Air flow based on oxidized
efficiency and the concentration of oxygen in the off gas (normally is 6%-9%).
Parts of or all the air, which is introduced into the middle and lower sections,
flow into the bottom of the upper part of the oxidizer. The HWS and the air,
which get into the bottom of the upper part, are concurrent upwards. HWS is
partly oxidized and flows out from the top of the upper section and then gets
into the bottom of the middle section. The HWS together with the fresh air are 3
concurrent upwards. The mixture of air and liquid, which flows out from the top
of the upper section, gets into degasser to eliminate air. After that, the liquid
gets into the bottom of the lower part and together with the fresh air are
concurrent upwards. The mixture of air and liquid, which flows out from the top
of the middle section, gets into degasser to eliminate air. Determinate level of
the degasser is controlled by auto valve. Oxidized WS (OWS), after cooled by
cooler, gets into tank, and then is pumped into the bottom of extractor. Off gas
of the oxidizer gets into condenser, and then gas and condensate get into
aromatic receiver drum. After that, the gas goes into off gas separator. Liquid is
recovered into aromatic recover tank, and the off gas gets into handling unit
after the pressure of the top of the tower is controlled by instrument. The
temperature of the oxidizer is controlled by controlling flow of cooling water
into U type pipe which is contained inside the tower.
The oxidized WS, which contains H2O2, gets into the extractor from the
bottom of the tower. It is dispersed by sieve plate and then floats upwards.
Meanwhile, DMW with phosphoric acid is pumped to the top of the extractor
from DMW mixing tank. The flow of the water is controlled by auto valve. The
water flows downwards by downcome of the sieve plate, and the oxidized WS
and water are countercurrent extraction.
In this process, the water works as continuous phase and the oxidized WS as
