hedp vs hedp2na difference

 HEDP (1-Hydroxyethylidene-1,1-Diphosphonic Acid) and HEDP2 sodium (usually referred to as the sodium salt form of HEDP, such as the sodium version of 1-Hydroxyethylidene-1,1-Diphosphonic Acid) have a number of differences in chaical properties and applications. The following are their main differences:


1. Chaical structure


- HEDP: 1-Hydroxyethylidene-1,1-Diphosphonic Acid with the molecular formula C₂H₇O₇P₂. It is an organic acid containing two phosphate groups and exists mainly as a free acid. It has a hydroxyl group and two phosphate groups in its structure.


- HEDP 2Na: It usually refers to the sodium salt form of HEDP, such as the disodium salt of 1-Hydroxyethylidene-1,1-Diphosphonic Acid. Its chaical formula is C₂H₇Na₂O₇P₂. Compared to HEDP free acid, the sodium salt form has sodium ions in the molecule replacing the hydrogen ions of the free acid.


2. Solubility


- HEDP: As a free acid, HEDP usually has low solubility and poor solubility in water, so a pH adjustment is often required to increase its solubility.


- HEDP 2Na: Due to its sodium salt form, sodium HEDP2 usually has good water solubility. The sodium salt form of HEDP is easier to dissolve in water and is suitable for use in a variety of water treatment applications.


3. Uses


- HEDP: As a dispersant and anti-scaling agent, it is commonly used in the chaical industry, water treatment, textile treatment, etc. The acidic form of HEDP is suitable for special applications that require pH adjustment.


- HEDP2Na : Due to its good solubility and stability, sodium HEDP2 is widely used in water treatment, detergents, industrial circulating cooling water systas and other fields. It is commonly used to prevent scale deposition and as an additive for chaical reactions.


4. Stability and treatment


- HEDP: As a free acid form, it needs to pay attention to pH value and corrosivity issues when handling and storing, and usually needs to be stabilized in an acidic environment.


- HEDP2Na: The sodium salt form of HEDP has better stability and is relatively simple


http://en.hedpna.com/view.asp?id=76


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