CAS No.: 64723-18-8
Synomyms:
Polymer of potassium L-aspartate;
L-Aspartic acid, homopolymer, potassium salt;
Polyaspartic acid potassium salt; KPASP;
Related product:
Sodium Polyaspartate (PASP-Na)
Potassium polyaspartate is potassium (K) salt of polyaspartic acid.
Potassium polyaspartate is used as anti-scaling additive, polymeric dispersant, stabiliser against tartrate crystal precipitation in wine (only food grade), fertilizer synergist in agriculture.
Technical Data
| CAS number | 64723-18-8 |
| Chemical name | L-aspartic acid, homopolymer, potassium salt |
| Assay | Not less than 98 % on dry weight basis |
| Particle size | Not less than 45 μm (not more than 1 % in weight of particles of less than 45 μm) |
| Description | light brown odourless powder |
| Solubility | Very soluble in water |
| pH | 7.5-8.5 (40 % aqueous solution) |
| Loss on drying | Not more than 11 % (105°C,12 hours) |
| Potassium hydroxide | Not more than 2 % |
| Aspartic acid | Not more than 1 % |
| Other impurities | Not more than 0.1 % |
| Arsenic (As) | Not more than 2.5 mg/kg |
| Lead (Pb) | Not more than 1.5 mg/kg |
| Mercury (Hg) | Not more than 0.5 mg/kg |
| Cadmium (Cd) | Not more than 0.1 mg/kg |
Synthesis routes
There are two common process routes for synthesizing salts of polyaspartic acid.
- First method, food grade L-aspartic acid is used as the main raw material. This route was usually chosen for drinking water treatment chemical (Na-PASP scale inhibitor), food grade potassium polyaspartate.
- The other method, maleic anhydride is used as the main raw material. Cooling water treatment grade product is usually produced by this method.
In agriculture, potassium polyaspartate can be used as anti scale deposit and dispersant in irrigation system, and raw material for saline soil improver, fertilizer potentiator. Potassium polyaspartate can promote root growth and enhance stress resistance.
Potassium polyaspartate 45% solution is usually used in agriculture.
