Analysis of copper strip corrosion and application of anti-corrosion additive used for copper strip corrosion test for FCC gasoline

The copper strip corrosion qualification for FCC gasoline is one of the national standards. Since more AGO or VGO as the feed of FCC unit, the copper strip corrosion of FCC naphtha is becoming one thorny problem. According to the national standard test method and the modem equipment analysis, an approach to the copper strip corrosion of some independent sulfides and corrosive gasoline was carried out, and the products formed on the copper strip were analyzed. The results demonstrate that the different active sulfides can induce the different corrosion degrees for copper strip. The existence of active sulfides in gasoline is the reason resulting in copper strip corrosion. An anti-corrosion additive UNOP-2 for FCC gasoline was developed. The copper strip corrosion test for sulfides and gasoline were made. The anti-corrosion characteristic tests demonstrate that UNOP-2 has the good solubility in gasoline and strong ability to prevent the copper strip corrosion.