Download Hydrochloric Acid

Hydrochloric Acid
The activities in the field of Hydrochloric Acid processing mean for PLINKE the treatment of acids and
waste air. Various processes are available for different requirements: Pre-concentration of Hydrochloric
Acid up to 24 % HCl, medium concentration up to 35 % HCl, high concentration up to 100 % HCl, purification of Hydrochloric Acid, recovery of Hydrochloric Acid gases. Different extractive agents like CaCl2,
MgCl2 or H2SO4 as well as dual pressure systems may be used.
Pre-Concentration
Alternatively the two pressure process
A raw Hydrochloric Acid with a low HCl
is available. In the first step pre-con-
content is separated by rectification
centrated acid of about 22–24 % HCl is
into the head product water and the
split into the head product with about
sump product azeotropic Hydrochloric
30–35 % HCl and the sump product
Acid. According to the operating pres-
azeotropic acid using rectification un-
sure, the azeotropic concentration is
der pressure. In the second step the
between 18 and 24 % HCl. Hydrochlo-
azeotropic acid is re-strengthened by
ric Acid is purified using simple pro-
evaporating water at vacuum condi-
cess steps during pre-concentration.
tions up to 22–24 % HCl and then recycled to the first step.
Medium Concentration
As an alternative the azeotropic acid
A medium concentrated acid with a
can also be re-strengthened using high
concentration of 30–35 % can be pro-
concentrated HCl gas.
duced from any diluted raw Hydro­
chloric Acid. Using extractive rectifica-
High Concentration
tion weak Hydrochloric Acid is mixed
In order to produce high concentrated
with an extraction agent and fed into
HCl gas up to 100 % HCl the same pro-
the rectification column. Due to the
cesses as for the medium concentration
extractive agent, the water is absorbed
are applied by varying the operating
and the volatility of the Hydrochloric
conditions.
Acid is increased. At the head of the
column, medium concentrated Hydro-
Purification/Recovery
chloric Acid is refined; a diluted extrac-
Spent Hydrochloric Acids of various
tion agent is obtained in the sump,
origins are recovered and purified from
re-concentrated in an external evapo-
organic and inorganic impurities.
rator and fed back into the column. Brine, like CaCl2 or MgCl2 or alternatively
H2SO4, may be used as an extractive
agent to remove the water.
Process schemes
Steam
Effluent Gas
Weak Hydrochloric Acid
Effluent Water
Pre-Concentrated
Hydrochloric Acid
Impurities
Pre-Concentration
Concentration of Hydrochloric Acid up
to azeotropic composition.
Weak
Hydrochloric
Acid
Concentrated
Hydrochloric
Acid
Steam
Effluent Gas
Effluent Water
Medium/High Concentration
Weak Hydrochloric Acid is concentrated
up to 100 % HCI using extractive
rectification (alternatively dual pressure
process).
Plinke GmbH
Kaiser-Friedrich-Promenade 24
61348 Bad Homburg
Tel.: +49 6172 126-0
Fax:+49 6172 126-8990
[email protected]
www.plinke.de
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