Study underscores effectiveness of antifoaming agent in DGA sweetening process

Laboratory studies of polysiloxane (DB-31), an antifoaming agent used in diglycolamine (DGA) gas-sweetening units, indicate that DB-31 substantially reduces the DGA solution surface tension and thereby reduces foaming.The effect is reversed at high concentrations, however, when critical micelle concentration (CMC) is reached.Nuclear magnetic resonance (NMR) spectroscopy and gel permeation chromatography (GPC) studies showed no degradation or any chemical change of either DB-31 or DGA when exposed to plant temperature and pressure conditions.This suggests that DB-31 is stable chemically and thus can be recovered.The research yielding these results follows years of foaming as a persistent p...

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