Differences between EDTMPA and EDTMPS

EDTMPA (ethylenediamine tetramethylenephosphonic acid) and EDTMPS (ethylenediamine sodium tetramethylenephosphonate) are two common organic phosphoric acid condensates, which are widely used in the fields of water treatment, industrial cleaning and metal corrosion inhibition. The main differences between them are as follows:

Chemical structure:

EDTMPA: ethylenediamine tetra-methylenephosphonic acid, the molecular structure contains four carboxyl groups and one ethylenediamine group, no phosphorus element.

EDTMPS: Ethylenediamine tetra-methylenephosphonic acid, the molecular structure contains five phosphate groups and one ethylenediamine group.

Phosphorus Content:

EDTMPA does not contain phosphorus, its scale inhibition comes mainly from the complexation of carboxyl groups with metal ions.

EDTMPS contains phosphorus, so in addition to scale inhibition, it also has the properties of phosphorus chemicals, such as the inhibition of metal corrosion by phosphorus chemicals.

Application areas:

EDTMPA is mainly used in the field of water treatment, such as scale inhibition, dispersion and complexation of metal ions.

In addition to water treatment, EDTMPS is also commonly used in metal corrosion inhibition and oil field water injection, etc. Its phosphorus-containing structure helps prevent metal corrosion.
Performance Differences:

Due to the presence of phosphorus-containing elements, EDTMPS may perform better in metal corrosion inhibition.

In terms of scale inhibition and dispersion, the performance of both is relatively similar, but may vary depending on the specific application environment and conditions.

Overall, EDTMPA and EDTMPS have significant differences in chemical structure, phosphorus content, and application areas, and should be evaluated for specific needs and applications.