Recovery of Ammonia and Hydrogen from Purge Gas of Ammonia Synthesis Loop of FFC

Abstract

In the past few years, air pollution has become one of the major threats to the environment and it is harmful for every living being on the planet. The emission of harmful waste gases from the industries pose a major threat to life on the planet. The Purge and Off gas from the ammonia synthesis plant were also directly burnt off in the boilers which results in NOx formation. There was a need to develop an economical and environmentally friendly process to coup up with the increasing industrial challenges. The project focuses on the recovery of Ammonia from the Purge Gas coming from the synthesis Loop and Off Gas from the Letdown Vessel of the Ammonia synthesis Plant-1 of FFC. The ammonia free Purge gas is further subjected to membrane separation for the recovery of Hydrogen Gas which is recycled back to the main synthesis loop as a raw material for Ammonia production, while the ammonia free Off Gas is sent to the Boilers for burning. Ammonia is finally recovered from the distillation tower and sent to storage. This project does not only provide an environmental friendly solution for the problem at hand, but also produces two very useful products, i.e. Ammonia and Hydrogen, which can further be used for various applications, thus making it an economical process.