DRIZO UNIT COMPETES WITH SOLID BED DESICCANT DEHYDRATION

摘要

The patented Drizo Gas Dehydration process is a glycol enhancement process using a commonly available hydrocarbon solvent to counter current contact semi-lean glycol to affect a very high glycol purity to the gas-glycol contactor. An improvement, drying the hydrocarbon liquid solvent with a small solid bed dryer prior to solvent vaporization, has permitted a measured 99.999 wt. % TEG glycol purity, with consistent exit water outlet content of 0.1 ppm or less for a measurable dew point depression of at least 135 C (243 F). This corresponds to a +30C (86F) contactor temperature with a -108C (-162F) demethanizer reflux processing temperature. The M.O.L. design criteria was a water dew point of -85C (-121F) at 16 Barg (232 Psig) and demethanizer reflux flow dew point of -108C (-162F) at 16 Barg (232 Psig), relating to an exit water content of the contactor between 0.1 and 0.16 ppm. The unit has been running at a consistent outlet water content of less than design values on a continuous basis for over a year. This paper will relate the site experience of this singular unit at the M.O.L. Szeged Gas Treating facility.