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This document has not been fully peer reviewed and <strong>the</strong> <strong>information</strong> within is not validated nor endorsed by <strong>the</strong> TWG
on LVIC-S or by <strong>the</strong> European Commission, it is meant for <strong>information</strong>, only
There are no special features or limiting factors to be mentioned [89, CEFIC-INCOPA, 2004].
There is a wide range of air and water emissions. This depends on <strong>the</strong> type of gas scrubber.
Some scrubbers can recycle water by concentrating hydrochloric acid and re-using it in <strong>the</strong>
process. Therefore, waste water emission from scrubber water is minimised.
1.1.2 Aluminium chloride (solution)
1.1.2.1 General <strong>information</strong>
Product Name : Aluminium chloride solution
CAS number : Not established for aluminium chloride solution
Aluminium chloride is a very common aluminium salt, <strong>the</strong> major uses of which are:
4
Use Application
Water treatment As a coagulant for drinking, industrial waste and municipal waste water
About 25000 tonnes of aluminium chloride (as inorganic coagulant) were produced in 2002 at
three locations.
1.1.2.2 Process description
Aluminium chloride solution is formed directly by <strong>the</strong> digestion of aluminium hydroxide and
hydrochloric acid in a stoichiometric reaction. The reaction is carried out at a temperature
between 100 and 110 °C. After <strong>the</strong> reaction, insoluble aluminium hydroxide is removed by
filtration and is used again at <strong>the</strong> beginning of <strong>the</strong> process. The clear liquid is conditioned with
water to become <strong>the</strong> finished product of a well defined quality.
Al(OH)3 + 3HCl F AlCl3 + 3H2O
The process flow diagram for <strong>the</strong> manufacture of aluminium chloride solution is given in
Figure 1.3.
Al(OH) 3
HCl
Reaction Filtration
Unreacted Al(OH) 3
Figure 1.3: Process flow diagram – manufacture of aluminium chloride solution
[89, CEFIC-INCOPA, 2004]
AlCl 3