Process equipment flowsheet to liquefy ammonia

At 1 atm ambient condition ammonia liquefy at -33.3oC, the process for cooling the vapor need lots of energy. Flowsheet shown here is preliminary design of the system that liquefies ammonia at 3oC. By means of pressurizing the vapor and cooling it using cooling tower water shifts the equilibrium to achieve the liquid state of ammonia.

Equipment’s considered in the design:

  • Two reciprocating compressors
  • One heat exchanger
  • One insulated flash cum cooler vessel

Diagram of ammonia liquefaction process done by compression and cooling technique.

Model equipment diagram of liquid ammonia storage system

Chemical process equipment for ammonia liquefaction