Eastman AdapT for tail gas treatment
The tail gas treatment (TGT) process converts sulfur vapor and sulfur dioxide (SO2) contained in the tail gas from the Claus process to hydrogen sulfide (H2S). This is absorbed by an amine solution and returned to the Claus process, ensuring high sulfur recovery.
Processes:
Products:
Requirements:
The TGT is typically designed to deliver a gas containing between 10 and 250 parts per million by volume (ppmv) of residual H2S, which is emitted into the atmosphere or incinerated. The precise amount will depend on the environmental legislation or general plant environmental targets. An incinerator is often installed before emission to convert the H2S to the less hazardous SO2.
Challenges
The removal requirements for a tail gas treatment unit are particularly challenging because of the extremely low pressure and the presence of CO2, since CO2 absorption needs to be minimized. MDEA-based solvents are preferred because of the inherent selectivity of a tertiary amine like MDEA, which favors H2S absorption over CO2.
Eastman’s answer
Eastman AdapT flexible gas sweetening solutions are designed to enhance selectivity beyond the performance associated with unformulated MDEA. Using Eastman’s amines for deep sulfur removal achieves more than 99.9% sulfur recovery in the removal process.