NC-208(ZFI41NC) HPAA
(1)Molecular Weight & Chemical Structure:
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156.03 |
C2H5O6P |
(OH)2 |
P |
- |
C |
H-COOH |
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CAS:23783-26-8 |
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O |
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O |
H |
(2)Properties:
a. HPAA could be dissolved and separated into two forms: [HPAA]2-& [HPAA]3- in water with pH value between 7 to 9. It could collate with Ca2+ Zn2+ to form a protection membrane of 1:1 chelation complex in the surface of metals. The solubility product (ksp) is as follows: (Zn)(HPAA)<(Ca)3(HPAA)2<(Ca)(HPAA). So, if add Zn2+ in the formula, the corrosion rate can be very high, because corrosion in the metal negative pole may cause the concentration of OH- elevated. The protection membrane will mainly exist as (Zn) (HPAA) and (Ca)3 (HPAA)2. If add HPMA (NC-303) or NC-309 in the formula, the protection membrane will become compact and even. So, we highly recommend our users to complex this product with Zn2+ to act as corrosion inhibitor, because its phosphino-group, carboxyl group and hydroxyl group will make it a very good scale inhibitor.
b. The COD value is 0.34gO2/g. When the cooling water contains dissociative chlorine, it will be oxidized. When confronted with oxidant, it will dissolve quickly. Its thermal stability could indicate 160oC with PSC.
(3) Specification:
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Appearance |
Dark brown liquid |
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Solid content, % >= |
50.0 |
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Organic Phosphate(as PO4), % >= |
25.0 |
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Phosphoric acid(as PO4), %,<= |
1.5 |
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Phosphorous acid(as PO3), % <= |
3.0 |
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Density (200C g/cm3) >= |
1.30 |
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pH(10g/L water solution)<= |
3.0 |
After detected with 31P-NMP.It is concluded that tis NC-208 has the content of more than 85%. It is in accordance
with Belcor 575 of Ciba-Geigy Company.
(4) use:
HPAA could be widely used as scale inhibitor and corrosion inhibitor in cooling water circulation system for steel
& iron, petro-chemitry, power and medical industry. It is usually scale inhibitor when complexed with zinc salt.It
is a scale inhibitor specially suitable for Low Hardness water in South China.
(5) Packing&Storage:
In 200Kg or 25Kg in plastic pails,storage is one year.