2020 REFINING PROCESSES HANDBOOK PROCESS CATEGORIES COMPANY INDEX DESULFURIZATION Advanced Ammonia Claus Air Application: Recovery of sulfur from sour water stripper (SWS) gas and amine acid gas, regardless of the ammonia (NH3 )/hydrogen sulfide (H2S) ratio in the combined stream from the burner. Description: This technology represents a further enhancement to the traditional ammonia Claus technology. The thermal reactor of the Claus process is modified to accommodate two subsequent partial oxidation stages. The first oxidation stage is carried out on the gaseous ammoniacal stream, optionally also containing H2S. The second oxidation stage takes place downstream the first oxidation step on the gaseous stream with the higher concentration of H2S. Both partial oxidations are carried out with air or with an air oxygen-enriched stream. The ammoniacal stream is partially oxidized, in slight deficiencies of oxygen, at a high temperature to ensure the substantial destruction of NH3. The overall oxidizing agent is divided into two distinct streams. Each stream is introduced in the thermal reactor in correspondence with the feeding ports of the two process streams. In particular, the oxidizing element in the second oxidizing stage is fed by means of a special internal distributor. The gaseous stream that results from the partial oxidation stages is changed to the Claus process catalytic section for the recovery of sulfur. Advanced ammonia burner SWSG Themal reactor AAG Installations: Italian refinery Licensor: Siirtec Nigi S.p.A. Operating conditions: For feedstock with a high NH3 /H2S ratio. Website: www.siirtecnigi.com/design-sulphur-recovery-removal Yields: Up to 95% sulfur recovery as standard Claus with two catalytic converters. Contact: marketing@siirtecnigi.com Advantages: Debottlenecking of the traditional ammonia Claus. Investment: Similar to a standard Claus unit, with a slight increase in thermal reactor dimensions. Utilities: Power and water as standard Claus. Enriched air technology may be applied. Development/Delivery: Siirtec Nigi's R&D development; patented technology; first commercial tryout Copyright © 2020 Gulf Energy Information. All rights reserved.http://www.hydrocarbonprocessing.com/ http://www.siirtecnigi.com/design-sulphur-recovery-removal