Corrosion resistance of alloy steels in media encountered in manufacture of synthetic naphthenic acids

The behavior of alloy steels in product streams in the hydrogenation of C/sub 9/ alkylbenzoic acids (ABA) to synthetic naphthenic acids in a continuous-flow pilot unit was investigated in static corrosion test apparatus, in dynamic corrosion test apparatus, and in a glass flask with a reflux condenser. Test conditions and results are presented. 12Kh18N10T and 10Kh17N13M2T steels were corrosion-resistant and 08Kh21N5T and 07Kh16N6 steels were subject to nonuniform general corrosion in the stage of ABA hydrogenation at temperatures up to 200 C and pressures up to 10MPa.