dequest2016
(1-Hydroxyethylidene)bis-phosphonic acid tetrasodium salt
CAS: 3794-83-0
Molecular Formula: C2H9NaO7P2
dequest2016 - Names and Identifiers
dequest2016 - Physico-chemical Properties
| Molecular Formula | C2H9NaO7P2 | ||||||||||||||||||||||||
| Molar Mass | 230.02 | ||||||||||||||||||||||||
| Density | 2.074[at 20℃] | ||||||||||||||||||||||||
| Water Solubility | 774g/L at 20℃ | ||||||||||||||||||||||||
| Vapor Presure | 0Pa at 25℃ | ||||||||||||||||||||||||
| Appearance | Crystalline powder | ||||||||||||||||||||||||
| pKa | 2.18[at 20 ℃] | ||||||||||||||||||||||||
| Storage Condition | Room Temprature | ||||||||||||||||||||||||
| Sensitive | Easily absorbing moisture | ||||||||||||||||||||||||
| Physical and Chemical Properties |
| ||||||||||||||||||||||||
| Use | HEDP · Na4 is a sodium salt of HEDP, which is an excellent inhibitor of calcium carbonate scale. HEDP · Na4 is mainly used for metal corrosion inhibition of low-pressure boiler water treatment, circulating water treatment, industrial municipal cleaning water and swimming pool sterilization. HEDP • Na4 is a white powder solid, soluble in water, non-moisture absorption, easy to transport, suitable for use under severe cold conditions. HEDP • Na4 is an organic phosphonate scale and corrosion inhibitor, which can form stable complexes with iron, copper, zinc and other metal ions, and can dissolve the oxides on the metal surface. At 250 deg C still play a good corrosion and scale inhibition. HEDP • Na4 is widely used in electric power, chemical industry, metallurgy, chemical |
dequest2016 - Risk and Safety
| Risk Codes | R36/38 - Irritating to eyes and skin. R36 - Irritating to the eyes R22 - Harmful if swallowed |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S36 - Wear suitable protective clothing. |
| RTECS | JL6475000 |
dequest2016 - Nature
Open Data Verified Data
brown-yellow viscous liquid. Pure melting point of 19 8~199 deg C. Soluble in water and ethanol.
Last Update：2024-01-02 23:10:35
dequest2016 - Preparation Method
Open Data Verified Data
The hydroxyethylenediphosphonic acid may be neutralized with an aqueous sodium hydroxide solution to a pH of 2 to 3.
Last Update：2022-01-01 09:29:06
dequest2016 - Application
Open Data Verified Data
organic phosphonate scale and corrosion inhibitors can form stable complexes with iron, copper, zinc and other metal ions, and can dissolve the oxides on the metal surface. At 200 deg C still play a good corrosion and scale inhibition. Is an excellent calcium carbonate scale inhibitor, widely used in electric power, chemical industry, metallurgy, chemical fertilizer and other industrial circulating cooling water, low pressure boiler, oil field water injection and oil pipeline scale and corrosion inhibition; In the textile industry, it can be used as cleaning agents for metals and nonmetals, peroxide stabilizers and fixing agents for printing and dyeing industry, cyanide-free electroplating complexing agents, and daily chemical additives.
Last Update：2025-08-19 16:24:40
dequest2016 - Safety
Open Data Verified Data
is weakly alkaline, should avoid contact with the eyes, skin, once the skin and eyes, should be immediately washed with a large amount of water.
Last Update：2022-01-01 09:29:07
dequest2016 - Reference Information
| LogP | -3 at 23℃ |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| application | tetrasodium hydroxyethylenediphosphonate is an organic compound that can be complexed with various metal ions. It is used as a scale inhibitor in cooling water and boiler water treatment. Good heat resistance. 200 ℃ still has good effect; It can also be used as corrosion inhibitor and cyanide-free electroplating additive. |
| use | can be complexed with a variety of metal ions. Used as scale inhibitor in cooling water and boiler water treatment. Good heat resistance. 200 ℃ still has good effect. It can also be used as a corrosion inhibitor and a non-cyanide electroplating additive. HEDP • Na4 is the sodium salt of HEDP and an excellent inhibitor of calcium carbonate scale. HEDP • Na4 is mainly used for metal corrosion inhibition of low pressure boiler water treatment, circulating water treatment, industrial municipal clean water and swimming pool sterilization. HEDP • Na4 is a white powder solid, easily soluble in water, does not absorb moisture, is convenient to transport, and is suitable for use in severe cold conditions. HEDP • Na4 is an organic phosphonate scale and corrosion inhibitor, which can form a stable complex with iron, copper, zinc and other metal ions, and can dissolve oxides on the metal surface. It still plays a good role in corrosion and scale inhibition at 250 ℃. HEDP • Na4 is widely used in electric power, chemical industry, metallurgy and chemistry it can be used as raw material for pesticide intermediates and organic synthesis raw material |
| production method | neutralize spasmodyl diphosphonic acid with sodium hydroxide aqueous solution until the oH value is 2~3. The finished product is obtained. It is obtained by neutralizing hydroxyethylenediphosphate with sodium hydroxide aqueous solution and spray drying. See Hydroxyethylenediphosphate for details. |
Last Update：2024-04-09 20:45:29
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