January 2004

Special Report: Gas Processing Developments

New charts estimate acid gas solubility in TEG

Process engineers can calculate absorption of H2S and CO2 in triethylene glycol to optimize operations

Wichert, E., Sogapro Engineering Ltd.; Wichert, G. C., Penn West Petroleum LTd.

When sour natural gas or acid gas is dehydrated with triethylene glycol (TEG), a substantial amount of H 2S and CO 2is absorbed in the TEG. Upon regeneration of the rich TEG solution, the acid gas components are liberated. The amount of these compounds absorbed, and consequently liberated from the glycol, depends on their concentration in the gas being dehydrated and the contactor pressure and temperature. Charts have been generated for estimating the amount of H 2S and CO 2absorbed per volume of TEG circulated versus the partial pressure of the acid gas components and the absorber temperature. These charts were developed on the basis of experimental data. 1Here

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