Gas Compression
Ammonia & UREA Production
Ammonia and urea production are the foundation of the global fertiliser industry — and among the most compression-intensive chemical manufacturing processes in the world. From synthesis gas preparation through the ammonia synthesis loop to CO₂ compression for urea production, compressors are critical assets in every stage of the process, operating continuously under some of the most demanding pressure and temperature conditions in industrial gas compression.
NEXT Lubricants supports ammonia and urea production with compressor lubricants developed for synthesis gas, CO₂ and ammonia vapour compression duties across fertiliser and chemical manufacturing plants.
Compression process
Ammonia & Urea Production — Process, Applications & Compressor Role
Ammonia is produced by reacting nitrogen and hydrogen over a catalyst at very high pressure and temperature in the Haber-Bosch synthesis loop — a continuous, high-pressure process where the synthesis gas compressor is the most critical rotating machine in the plant. The feed gas — a hydrogen and nitrogen mixture — is compressed to synthesis loop pressure across multiple stages, with unreacted gas recycled through the loop until conversion is achieved. Urea production adds a further compression duty: CO₂ must be compressed to the high pressures required for reaction with ammonia in the urea reactor.
Each compression duty in an ammonia or urea plant involves a different gas at different pressures — synthesis gas at very high pressure, CO₂ at urea reactor conditions, and ammonia vapour in the process refrigeration circuit. These are distinct applications handled by separate compressors, each with specific gas compatibility and operating requirements that must be addressed independently during lubricant selection.
Synthesis Gas Compression
The synthesis gas compressor raises a hydrogen and nitrogen mixture to synthesis loop pressures of 150–300 bar across multiple stages, operating continuously as the heart of the ammonia plant. It is typically the single largest and most critical compressor in the facility.
Process Refrigeration — Ammonia Circuit
Ammonia vapour compression in the process refrigeration circuit maintains the low temperatures required for ammonia condensation and product recovery within the synthesis loop, using ammonia itself as the refrigerant.
CO₂ Compression for Urea Production
In integrated ammonia-urea plants, CO₂ recovered from the reforming section is compressed to the pressures required for reaction with ammonia in the urea reactor — a separate compression duty with different gas properties and operating conditions from the synthesis loop.
Methanol & Other Derivative Production
Some plants produce methanol, nitric acid or other nitrogen-based products alongside or instead of urea, involving additional process gas compression duties with different gas compositions and operating conditions at the compressor.
Related Applications
Explore Other Gas Compression Applications
Ammonia and urea production is one part of a broader process and gas compression landscape. NEXT Lubricants also supports the following applications.
CO₂ Compression
Compression of carbon dioxide in carbon capture, industrial CO₂ supply and process applications where high-pressure CO₂ handling requires specific consideration.
Gas Gathering & Processing
Compression of associated gas and processed gas streams from wellhead collection through NGL extraction, dehydration and condensate stabilisation ahead of pipeline export.
Petrochemical Gas Compression
Process gas compression in petrochemical manufacturing where gas streams include reactive and specialty components under demanding operating conditions.
Sour Gas Compression
Compression of gas streams containing hydrogen sulphide (H₂S) and carbon dioxide (CO₂) where gas composition places specific demands on materials and lubricant compatibility.