off spec coloring of ngl
Posted in the Chemical Engineering Forum
#1 Mar 3, 2013
we are providing gas lift for oil recovery. The gas is compressed to 1050psig and any "extra" gas not used in lifting is slipped to a 150 psi pipeline. We have been collecting some 25 barrels of ngl per million cu. ft. of gas processed. The only problem is we are having to take a reduced market price for the ngl as it won't pass the saybolt color test. i have 5 streams contributing ngl's. Three easily pass the test and two fail The largest contributor to the stream is filter separation upstream of the dehy. It receives a -4 on saybolt test. The 2nd interstage liquids also fail at -16. The two things i find in common in these two streams is (1) both before dehydration and (2) both contain lube oil. The other three steams are from fuel gas sep., gas lift sep. and 150 psi final scrubber sep. all are +30 on saybolt.
Question: Could lube oil (and its additives) be causing the color problem? Will activated carbon be the answer?
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