FIELD: crude oil treatment.
SUBSTANCE: treatment of hydrogen sulfide-containing crude oil before transportation and separation comprises multistep separation of original crude oil followed by dehydration and desalting, flushing with hydrocarbon gas in desorption column, and addition of monomethanolethanolamine (obtained by reaction of monomethanolamine with formaldehyde), and stirring. Flushing is accomplished with hydrogen sulfide-containing gas ensuring weight percentage of hydrogen sulfide in post-flushing oil no higher than 200 ppm. After addition of monomethanolethanolamine, according to invention, up to 10% of fresh washing water is additionally charged. All aforesaid operations are carried out before desalting step.
EFFECT: reduced contents of hydrogen sulfide and water in commercial oil.
1 dwg, 3 tbl
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