March 2012

Special Report: Corrosion Control

Reduce CO2 in acid gas from amine-based TGTUs

Improve furnace temperature and sulfur recovery

Spooner, B., Sulphur Experts Inc.; Derakhshan, F., Sulphur Experts

The purpose of an amine-based tail gas treating unit (TGTU) is to recycle any leftover sulfur components in the tail gas of a Claus sulfur recovery unit (SRU) to the front end of the plant, rather than incinerate them. The remaining sulfur components are converted to hydrogen sulfide (H2S) and removed from the gas using an amine solution. Carbon dioxide (CO2) is also present in tail gas streams and will be partially co-absorbed with H2S. This CO2 co-absorption should be minimized. Any CO2 removed in the TGTU will be recycled to the SRU front end along with the H2S, which has negative consequences for the reaction furnace and for the overall sulfur recovery. This article discusses th

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