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© 2013 Published by Center for Pulp and Paper through REPTech2012
Table 3 Property of Peroxymonosulfuric
Chemical Name Peroxymonosulfuric Acid
Form Liquid of Clear and Colorless
mixture of H
2
O
2
, H
2
SO
4
,H
2
O Formula
H
2
SO
5
Molecular Weight 114.09
Active Oxygen 14.00
pH 1 2 Solution, 25
o
C, Synthesis with 45 H
2
O
2
= 95 H
2
SO
4
= 1 :3 mol
Density 1.04 gcm
3
2 Solution ORP
-1.44 V
4.2 The Effects of The “Sulfuric Acid and Hydrogen Peroxide Ratio” and The “Concentration of
Chemicals” to The Yield of Peroxymonosulfuric
The peroxymonosulfuric acid production is by the reaction between high-concentration hydrogen
peroxide and high-concentration sulfuric acid, which is an equilibrium reaction. Accordingly,
peroxymonosulfuric acid concentration, sulfuric acid concentration, and the ratio of them affect the yield of
peroxymonosulfuric acid. Fig. 5 shows the relations of them. As a result, in the case of the reaction at 95
sulfuric acid, 45 hydrogen peroxide and their mole ratio of 31, the yield was about 75 . When using 60
hydrogen peroxide, the yield was about 83 .
Fig. 5 Effect on H
2
O
2
Concentration to MPS Yield
4.3 The Effects of The Dilution Ratio
The concentration of the produced peroxymonosulfuric acid is about 22 - 25 . When
using this peroxymonosulfuric acid as it is, there arise problems like high risk of metal corrosion,
unstableness, and danger in handling. Accordingly, it is desirable to dilute it before use. Fig. 6 shows the
results of the study about dilution. The results showed that, if the dilution ratio is low, the diluted solution
becomes more unstable than the undiluted solution. When the dilution ratio is 6, the diluted solution was
as stable as the undiluted solution. When diluting ten times, the stability improved. Accordingly, ten
or higher dilution ratio is employed in the actual equipment.
Fig. 6 Effect on Dilution Multiple to MPS Yield
4.4 The Effects of The Dilution Temperature
At the time of peroxymonosulfuric acid production, the solution temperature rises up to 90 °C - 120 °C
in a short time by the reaction between concentrated sulfuric acid and concentrated hydrogen peroxide.
The peroxymonosulfuric acid is to be diluted after this liquid temperature is lowered. During this dilution,
the peroxymonosulfuric acid decomposes. Fig. 7 shows the results. It was conirmed that, when the
peroxymonosulfuric acid before dilution is 50 °C or hotter, the higher the temperature, the higher the
decomposition rate. Accordingly, it is desirable to cool the peroxymonosulfuric acid to 50 °C or less
before dilution.
Fig. 7 Effect on Dilution Temperature
4.5 Materials
