Ammonia recovery from purge gas

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 53/58 (2006.01) B01D 53/02 (2006.01) B01D 53/04 (2006.01)

Patent

CA 2422269

The invention relates to ammonia synthesis loops containing gasses, which do not react and would accumulate if they were not purged out. By the present invention ammonia in a purge gas is recovered by an adsorption agent operating at the full synthesis loop pressure. The adsorption agent is chosen in such a way that the ammonia can be removed again by passing a gas comprising hydrogen and nitrogen through it at the same elevated pressure as the loop pressure. This enables the adsorption agent to be regenerated by fresh synthesis gas coming from the synthesis gas compressor just before this gas enters the synthesis loop. Thereby, the re- generation requires an absolute minimum of energy consump- tion and equipment.

L'invention concerne des boucles de synthèse d'ammoniac contenant des gaz, qui ne réagissent pas et s'accumulent s'ils ne sont pas purgés. Selon la présente invention, l'ammoniac dans un gaz de purge est récupéré au moyen d'un agent d'adsorption fonctionnant à la pression intégrale de la boucle de synthèse. L'agent d'adsorption est choisi de telle sorte que l'ammoniac peut être extrait une fois de plus par circulation d'un gaz contenant de l'hydrogène et de l'azote dans l'agent, le gaz se trouvant à la même pression que celle dans la boucle. L'agent d'adsorption peut donc être régénéré par un gaz de synthèse frais provenant du compresseur de gaz de synthèse juste avant d'entrer dans la boucle de synthèse. Ainsi, la régénération requiert un minimum absolu d'énergie et de matériel.

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