The Nitrogen Rejection Unit (NRU) is used in gas processing facilities to reduce nitrogen (N₂) content in natural gas to meet sales gas and pipeline specifications. Gas entering the NRU is typically compressed, treated for CO₂ and moisture removal, and then routed to the nitrogen rejection section, where nitrogen is separated from methane using cryogenic distillation or adsorption-based processes. The methane-rich stream is sent to sales gas compression, while the nitrogen-rich stream is vented or utilized as fuel. By controlling nitrogen levels, the NRU ensures compliance with heating value requirements, improves gas quality, and enables efficient transportation and utilization of natural gas.