ConocoPhillips is operating a TEG unit upstream of a turbo-expander NGL recovery process on its 2/4 J platform on the Ekofisk field. This TEG unit, initially designed with the ColdFinger® regeneration process, gave from its initial start-up in 1998 insufficient water dew pointing, resulting in recurrent freezing problems in the downstream NGL recovery process. This was attributed to insufficient purity of the glycol regenerated in the Cold Finger process, reaching only a 99.3 wt % purity.
