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KOMAX PRE-MIXER FOR ACID DILUTION
High
concentrations of Sulfuric Acid (i.e., 93% or 98%) should not be
injected directly into a 316 Stainless Steel Static Mixer.
Within one to one and a half pipe diameters downstream of
the injection point, concentration of the Sulfuric Acid is
diluted to a very corrosive 50% to 30%
Continuous
exposure of the 316 Stainless Steel mixing elements and mixer
housing to this concentration of Sulfuric Acid will result in
severe corrosion in just a few months.
Concentrated
Sulfuric Acid has a specific gravity of 1.8 so it tends to
migrate to the bottom of the mixer housing particularly at lower
fluid velocities (i.e., less than 2 feet per second) which
compounds the problem.
Pre-diluting
concentrated Sulfuric Acid with additive water by means of a
small diameter Kynar-lined static mixer will reduce the acid
concentration down to a safe 10% or 5% level.
This simple and inexpensive precaution extends the
service life of the larger process stream Stainless Steel static
mixer for years.
An additional advantage is the larger volume of diluted acid
solution will provide equal flow rates through each discharge
orifice of the acid injector resulting in improved acid
distribution. When injecting one to two gallons per hour of
concentrated Sulfuric Acid the resultant flow exiting the
injector is only 2 to 4 ounces per minute. At this flow rate all
of the acid will exit the first injector orifice precluding
uniform dispersion of acid across the mixer housing diameter.
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