Di–Ammonium Phosphate (DAP 18-46-0)

 

Di-Ammonium Phosphate (DAP 18-46-0) is an inorganic salt with the chemical formula (NH₄)₂HPO₄, widely recognized as one of the most important and commonly used phosphorus fertilizers in global agriculture. It appears as a granular, crystalline material that is typically light brown, off–white, or beige in color, depending on production methods and purity.

 

Di-Ammonium Phosphate is valued for its high nutrient content, supplying approximately 18% nitrogen (N) in ammoniacal form and 46% phosphorus pentoxide (P₂O₅) in a readily soluble form. This high concentration makes DAP a highly efficient carrier of essential nutrients, particularly suited for basal or starter applications in a wide range of crops and soil types.

 

One of DAP’s notable characteristics is its excellent solubility in water, which allows for rapid nutrient availability immediately after application. When applied to soil, DAP dissolves quickly and releases phosphate and ammonium ions that promote faster root development, improved plant establishment, and stronger early growth. Initially, it produces a slightly alkaline reaction in the soil, which is temporary and naturally balances out as the crop develops.

 

In addition to its dominant role in agriculture, it is also used in various industrial and technical applications, including as a component in (1) Fire retardants, (2) Fermentation nutrients, (3) Metal surface treatments, and (4) Water conditioning formulations. Its multifunctional chemical properties and stability make it a versatile product across industries.

 

Produced through the controlled reaction of phosphoric acid with ammonia, high-quality DAP is free-flowing, non–hygroscopic, and suitable for bulk handling, blending, and long–distance transport. It is compatible with most other fertilizers and is a key ingredient in many NPK (nitrogen-phosphorus-potassium) fertilizer blends.

 

Overall, Di-Ammonium Phosphate (DAP) is a critical input for modern agriculture and an essential phosphate-based chemical used in several industrial sectors worldwide. Its balanced nutrient profile, ease of application, and widespread availability have established it as an indispensable product for enhancing crop productivity and supporting various chemical processes.

 

 

 

Production Of DAP 18-46-0:

 

Di-Ammonium Phosphate fertilizers first became available in the 1960s. It rapidly became the most popular in this class of products. It’s formulated in a controlled reaction of Phosphoric Acid (H₃PO₄) with Ammonia (NH₃). The hot slurry is then cooled, granulated and sieved. DAP handles and stores well. The standard nutrient grade of Di–Ammonium Phosphate is relatively high, at 18-46-0, so fertilizer products with lower nutrient content may not be labeled DAP. The high nutrient content of Di-Ammonium Phosphate helps reduce handling, freight and application costs. Di-Ammonium Phosphate is produced in many locations in the world and it is widely traded fertilizer commodity.

 

 

Uses of DAP 18-46-0:

 

Di-Ammonium Phosphate (DAP 18-46-0), with the chemical formula (NH₄)₂HPO₄, is one of the most widely used phosphorus fertilizers in the world. Its balanced supply of phosphorus (P₂O₅) and nitrogen (N) makes it valuable across agriculture and various industrial applications.

 

1.     Agricultural Uses:

 

1.1.  As a Major Fertilizer:

 

DAP is primarily used as a phosphatic fertilizer containing typically 46% P₂O₅ and 18% nitrogen.

 

•     It promotes;

• Strong root development.
• Improved flowering and fruiting.
• Greater overall plant vigor.

 

•     It is especially effective for;

• Cereals (Wheat, Rice, Maize).
• Oilseeds.
• Pulses and legumes.
• Vegetables and fruits.

 

1.2.  Early-Season Fertilizer:

 

•      Due to its high solubility, DAP quickly releases nutrients, making it ideal for;

• Basal application at planting.
• Starter fertilizer for seedling establishment.

 

1.3.  Soil Amendments:

 

•     It slightly increases soil pH upon application (temporary alkalinity), helping;

• Neutralize acidic soils.
• Improve nutrient uptake in early stages.

 

2.     Industrial Uses:

 

2.1.  Fire Retardants:

 

•     DAP is a major ingredient in wildfire retardant formulations.

•     It works by:

• Coating vegetation.
• Forming a protective layer when exposed to heat.
• Slowing fire spread.
• It is widely used by forest services globally.

 

2.2. Metal Surface Treatment:

 

•     Used in phosphate coating processes to:

• Prevent corrosion.
• Improve paint adhesion.
• Enhance surface lubrication.

 

2.3. Yeast and Fermentation Nutrient

 

•      In food and beverage industries, DAP serves as a:

• Nitrogen source for yeast during fermentation.
• Commonly used in wine, beer, and bioethanol production.

 

3.    Food and Feed Industries:

 

3.1. Food Additive (Leavening Agent):

 

•     Used in small quantities as a (1) leavening agent and (2) phosphate supplement.

 

3.2.  Animal Feed Supplement:

 

•     Incorporated into animal feed to:

• Supply essential phosphorus.
• Improve bone development.
• Support metabolic activities.

 

4.   Water Treatment:

 

4.1. Corrosion Control in Potable Water Systems

 

•     DAP is used in combination with other phosphates to:

• Form protective films on pipes.
• Reduce lead and copper leaching.

 

5.     Other Niche Applications:

 

5.1.  Fire Extinguishing Powders

 

•       As a component in dry chemical fire extinguishers.

 

5.2. Production of Other Phosphate Chemicals:

 

•      Acts as a precursor for manufacturing:

• Ammonium polyphosphates.
• Fertilizer blends.
• Chemical reagents.

 

 

Conclusion on Di-Ammonium Phosphate (DAP 18-46-0):

 

In summary, it stands as a critical and versatile chemical compound with a profound global impact. Its primary and indispensable role is as a high-efficiency NP fertilizer, providing essential nitrogen and phosphorus to drive agricultural productivity and ensure global food security. Beyond the farm, its unique chemical properties enable vital secondary applications: as a fire retardant in combating wildfires, a yeast nutrient in food and beverage production, a corrosion inhibitor in water treatment, and a raw material in various industrial processes.

 

The utility of DAP stems from its key characteristics like high nutrient solubility, chemical stability, and alkaline pH which make it effective and reliable across diverse sectors. From nourishing crops to protecting forests, enhancing food production to safeguarding water infrastructure, DAP demonstrates remarkable versatility. Ultimately, it is a cornerstone material that supports not only modern agriculture but also critical aspects of industrial safety, manufacturing, and daily life, underscoring its sustained importance in the global economy.

 

Standard Specification of Di-Ammonium Phosphate (DAP 18-46-0):

 

Standard Specification of Di-Ammonium Phosphate (DAP 18-46-0):