Diammonium Phosphate Manufacture Technology Description

Online Diammonium Phosphate Data: Manufacture, Uses and Applications

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In this page you will find free data about Diammonium Phosphate, including:

  • What is Diammonium Phosphate
  • How to make Diammonium Phosphate
  • Diammonium Phosphate uses and applications

This page presents brief synopsis of Diammonium Phosphate production technology, describing, in a concise way, relevant technical and economic aspects. Each manufacturing process description will consist of:

  • Major process steps
  • Simplified, schematic flow diagram & key equipment
  • Important safety or environmental considerations
  • Economic perspective, comprising capital expenditures and/or operating expenses

Diammonium Phosphate Manufacture

Diammonium phosphate (DAP) ranks among the most important phosphate-based fertilizers, not only for its high nutrient content, but also for its excellent physical properties, such as high solubility and alkaline pH around the dissolving granules.

DAP is commonly formulated in a controlled reaction of phosphoric acid with ammonia. It is typically produced in both granular form, to be used as fertilizer either directly or blended with other types of fertilizers, and in nongranular form, to be used in liquid fertilizers.

Technology Description

The following paragraphs describe a process for diammonium phosphate production from phosphoric acid and ammonia via an ammoniation-granulation process using a pipe reactor. The figure below presents a simplified flow diagram of the process.

Diammonium Phosphate Manufacture Technology - Process Flow Diagram


Initially, phosphoric acid, gaseous ammonia, and scrubber liquor are directed to the pre-neutralizer reactor. The main goal of the pre-neutralization is ...

Drying, cooling and sizing

The DAP granules are dried with moderate heat at about 85°C. At this temperature, the wet fertilizer ...


A scrubbing circuit that comprises four scrubbers recovers the unabsorbed ammonia gases from ...

Economic Performance

An economic evaluation of the process described was conducted on a plant with the capacity to produce ...

To access a report with more content about this process click here.